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Move display into a separate component WIP.

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Compiles, but does not work correctly yet.
This commit is contained in:
Shaun Reed 2025-11-02 12:00:36 -05:00
parent d0ca65cb62
commit 2f385e9ed3
27 changed files with 895 additions and 1163 deletions
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4
esp/cpp/08_dht11-lcd/CMakeLists.txt
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@ -7,9 +7,9 @@ cmake_minimum_required(VERSION 3.26)
include($ENV{IDF_PATH}/tools/cmake/project.cmake) include($ENV{IDF_PATH}/tools/cmake/project.cmake)
project( project(
#[[NAME]] aht20 #[[NAME]] DHT11
VERSION 0.1 VERSION 0.1
DESCRIPTION "Using the AHT20 sensor with ESP-IDF over I2C" DESCRIPTION "Using the DHT11 sensor with ESP-IDF over I2C"
LANGUAGES CXX LANGUAGES CXX
) )
message(STATUS "[Klips] Configuring example: ${PROJECT_NAME}") message(STATUS "[Klips] Configuring example: ${PROJECT_NAME}")

4
esp/cpp/08_dht11-lcd/main/CMakeLists.txt
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@ -1,6 +1,6 @@
idf_component_register( idf_component_register(
SRCS SRCS
main.cpp display.cpp panel_device.cpp scoped_lock.cpp main.cpp
main.h display.h panel.h panel_device.h scoped_lock.h time_keeper.h ssd1306.h main.h
INCLUDE_DIRS . INCLUDE_DIRS .
) )

56
esp/cpp/08_dht11-lcd/main/display.cpp
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@ -1,56 +0,0 @@
/*#############################################################################
## Author: Shaun Reed ##
## Legal: All Content (c) 2025 Shaun Reed, all rights reserved ##
## ##
## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com ##
##############################################################################
*/
#include <lv_init.h>
#include "display.h"
// Static TimeKeeper for managing ESP timers across all displays.
TimeKeeper Display::timers_;
Display::Display(IPanelDevice &device) :
panel_(device)
{
if (!lv_is_initialized()) {
ESP_LOGI(TAG, "Initialize LVGL");
lv_init();
}
ESP_LOGI(TAG, "Creating LVGL display");
lv_display_ = panel_.device_->create_display();
// associate the i2c panel handle to the display
lv_display_set_user_data(lv_display_, panel_.esp_panel_);
panel_.register_display_callbacks(lv_display_);
}
void Display::set_text(const char *text,
const char *name,
lv_label_long_mode_t long_mode,
lv_align_t align)
{
// Lock the mutex due to the LVGL APIs are not thread-safe.
ScopedLock lock;
ESP_LOGI(TAG, "Display LVGL Scroll Text");
lv_obj_t *scr = lv_display_get_screen_active(lv_display_);
// Create the label if it's `name` doesn't already exist in the map keys.
if (!lv_objects_.count(name)) {
lv_objects_[name] = lv_label_create(scr);
}
auto obj = lv_objects_[name];
// Set text and long mode.
lv_label_set_long_mode(obj, long_mode);
lv_label_set_text(obj, text);
// Set the size of the screen.
// If you use rotation 90 or 270 use lv_display_get_vertical_resolution.
lv_obj_set_width(obj, lv_display_get_horizontal_resolution(lv_display_));
lv_obj_align(obj, align, 0, 0);
}

114
esp/cpp/08_dht11-lcd/main/display.h
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@ -1,114 +0,0 @@
/*#############################################################################
## Author: Shaun Reed ##
## Legal: All Content (c) 2025 Shaun Reed, all rights reserved ##
## ##
## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com ##
##############################################################################
*/
#ifndef DISPLAY_H
#define DISPLAY_H
#include <widgets/label/lv_label.h>
#include <unordered_map>
#include "time_keeper.h"
#include "panel.h"
#include "scoped_lock.h"
/**
* Encapsulates lv_display handle and related LVGL operations.
* Contains helper methods that wrap basic LVGL operations such as drawing text.
* The underlying lv_display can be obtained for manual LVGL operations.
* @sa ScopedLock
* @sa Display::get()
*/
class Display {
public:
/**
* Construct a new Display using an object that implements IPanelDevice.
*
* @param device An object that implements the IPanelDevice interface.
*/
explicit Display(IPanelDevice &device);
~Display() = default;
Display(const Display &) = delete;
Display(Display &) = delete;
Display &operator=(Display &) = delete;
using lv_display_handle_t = lv_display_t *;
//
// GETTERS
/**
* Getter for accessing LVGL display handle.
*
* @sa ScopedLock for calling custom LVGL API's not implemented by Display.
*/
[[nodiscard]] inline lv_display_handle_t get() const { return lv_display_; }
/**
* Getter for accessing LVGL display handle.
*
* @sa ScopedLock for calling custom LVGL API's not implemented by Display.
*/
[[nodiscard]] inline lv_display_handle_t get() { return lv_display_; }
/// Dereference operator for accessing LVGL display handle.
[[nodiscard]] inline lv_display_handle_t operator*() const { return get(); }
/// Dereference operator for accessing LVGL display handle.
[[nodiscard]] inline lv_display_handle_t operator*() { return get(); }
//
// LVGL OPERATIONS
/**
* Create a LVGL label with some given text on the current display.
* The name of the object can be reused to change text on this label later.
*
* @param text Text to write to the display.
* @param name Name for the LVGL label object associated with this text.
* @param long_mode LVGL long mode for text wider than the current display.
* @param align LVGL alignment to use for placing the label on the display.
*/
void set_text(const char *text,
const char *name,
lv_label_long_mode_t long_mode = LV_LABEL_LONG_SCROLL_CIRCULAR,
lv_align_t align = LV_ALIGN_TOP_MID);
//
// PUBLIC STATIC MEMBERS
/// Public static TimeKeeper for managing ESP timers across all displays.
static TimeKeeper timers_;
private:
//
// PRIVATE MEMBERS
/// Panel associated with this Display.
Panel panel_;
/// LVGL display handle.
lv_display_handle_t lv_display_;
/**
* LVGL object handles stored in the LVGL screen associated with this Display.
*
* @sa Display::set_text
* @sa lv_display_get_screen_active
*/
std::unordered_map<const char *, lv_obj_t *> lv_objects_;
/// Tag used for ESP logging.
constexpr static const char *TAG = "Display";
};
#endif // DISPLAY_H

4
esp/cpp/08_dht11-lcd/main/idf_component.yml
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@ -1,9 +1,9 @@
## IDF Component Manager Manifest File ## IDF Component Manager Manifest File
dependencies: dependencies:
idf: '>=5.3.0' idf: '>=5.3.0'
lvgl/lvgl: "9.2.0"
esp_lcd_sh1107: "^1"
i2c: i2c:
path: ../../components/i2c path: ../../components/i2c
lcd:
path: ../../components/lcd
ssd1306: ssd1306:
path: ../../components/ssd1306 path: ../../components/ssd1306

42
esp/cpp/08_dht11-lcd/main/main.cpp
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@ -6,36 +6,32 @@
############################################################################## ##############################################################################
*/ */
#include "main.h"
#include "i2c.h" #include "i2c.h"
#include "display.h" #include "lcd.h"
#include "ssd1306.h" #include "ssd1306.h"
// Pin may vary based on your schematic.
#define PIN_SDA GPIO_NUM_21
#define PIN_SCL GPIO_NUM_22
#define PIN_RST (-1)
extern "C" void app_main(void) extern "C" void app_main(void)
{ {
I2C_init(PIN_SDA, PIN_SCL); I2C_init(PIN_SDA, PIN_SCL);
auto i2c = I2C_get();
SSD1306 ssd1306(i2c);
Display d(ssd1306);
d.set_text("Test test 12345678910", IPanelDevice lcd = SSD1306_new();
"test-text1", LCD d = LCD_init(&lcd);
LV_LABEL_LONG_SCROLL,
LV_ALIGN_CENTER);
d.set_text("Test test changing text", LCD_set_text_with_mode(&d, "Test test 12345678910", "test-text1",
"test-text1", LV_LABEL_LONG_SCROLL, LV_ALIGN_CENTER);
LV_LABEL_LONG_SCROLL,
LV_ALIGN_CENTER);
d.set_text("Hello hello hello hello hello hello hello hello!", "test-text2"); // TODO: Uncomment and test once LCD::lv_obj_t is a dynamic array.
// LCD_set_text_with_mode(&d, "Test test changing text",
d.set_text("A random sentence with no meaning at all.", // "test-text1",
"test-text3", // LV_LABEL_LONG_SCROLL,
LV_LABEL_LONG_CLIP, // LV_ALIGN_CENTER);
LV_ALIGN_BOTTOM_MID); //
// LCD_set_text(&d, "Hello hello hello hello hello hello hello hello!",
// "test-text2");
//
// LCD_set_text_with_mode(&d, "A random sentence with no meaning at all.",
// "test-text3",
// LV_LABEL_LONG_CLIP,
// LV_ALIGN_BOTTOM_MID);
} }

27
esp/cpp/08_dht11-lcd/main/main.h
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@ -5,35 +5,8 @@
## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com ## ## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com ##
############################################################################## ##############################################################################
*/ */
#include "display.h"
#include "ssd1306.h"
// Pin may vary based on your schematic. // Pin may vary based on your schematic.
#define PIN_SDA GPIO_NUM_21 #define PIN_SDA GPIO_NUM_21
#define PIN_SCL GPIO_NUM_22 #define PIN_SCL GPIO_NUM_22
#define PIN_RST (-1) #define PIN_RST (-1)
I2C i2c(PIN_SDA, PIN_SCL, PIN_RST);
extern "C" void app_main(void)
{
SSD1306 ssd1306(i2c);
Display d(ssd1306);
d.set_text("Test test 12345678910",
"test-text1",
LV_LABEL_LONG_SCROLL,
LV_ALIGN_CENTER);
d.set_text("Test test changing text",
"test-text1",
LV_LABEL_LONG_SCROLL,
LV_ALIGN_CENTER);
d.set_text("Hello hello hello hello hello hello hello hello!", "test-text2");
d.set_text("A random sentence with no meaning at all.",
"test-text3",
LV_LABEL_LONG_CLIP,
LV_ALIGN_BOTTOM_MID);
}

87
esp/cpp/08_dht11-lcd/main/panel.h
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@ -1,87 +0,0 @@
/*#############################################################################
## Author: Shaun Reed ##
## Legal: All Content (c) 2025 Shaun Reed, all rights reserved ##
## ##
## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com ##
##############################################################################
*/
#ifndef PANEL_H
#define PANEL_H
#include "panel_device.h"
/**
* Encapsulates esp_lcd_panel handles and operations.
* The only exception is esp_lcd_panel_io_i2c_config_t owned by IPanelDevice.
* This structure requires details specific to the implementing device.
*
* Panel is an implementation detail of Display, not meant to be used directly.
*/
struct Panel {
/**
* Construct a new Panel using an object that implements IPanelDevice.
*
* @param device An object that implements the IPanelDevice interface.
*/
explicit Panel(IPanelDevice &device) :
device_(&device),
esp_io_(nullptr),
esp_panel_(nullptr),
esp_panel_config_(
(esp_lcd_panel_dev_config_t) {
.reset_gpio_num = static_cast<gpio_num_t>(device_->rst_num_),
.bits_per_pixel = 1,
.vendor_config = device_->vendor_config(),
}
)
{
esp_io_ = device_->create_io_handle();
device_->create_panel(esp_panel_config_, esp_io_, esp_panel_);
ESP_LOGI(TAG, "Resetting panel display");
ESP_ERROR_CHECK(esp_lcd_panel_reset(esp_panel_));
ESP_LOGI(TAG, "Initializing panel display");
ESP_ERROR_CHECK(esp_lcd_panel_init(esp_panel_));
ESP_LOGI(TAG, "Turning on panel display");
ESP_ERROR_CHECK(esp_lcd_panel_disp_on_off(esp_panel_, true));
}
~Panel() = default;
//
// PUBLIC MEMBERS
/// Pointer to object using known interface for IPanelDevice.
IPanelDevice *device_;
/// ESP LCD panel IO handle.
esp_lcd_panel_io_handle_t esp_io_;
/// ESP LCD panel handle.
esp_lcd_panel_handle_t esp_panel_;
/// ESP LCD panel configuration structure.
esp_lcd_panel_dev_config_t esp_panel_config_;
/**
* Registers LVGL draw buffers and callbacks for rendering the display.
*
* @param display_handle Pointer to the LVGL display to use for rendering.
*/
inline void register_display_callbacks(lv_display_t *display_handle) const
{
device_->register_rendering_data(display_handle, esp_io_);
device_->register_lvgl_tick_timer();
}
private:
//
// PRIVATE MEMBERS
/// Tag used for ESP logging.
constexpr static const char *TAG = "Panel";
};
#endif //PANEL_H

145
esp/cpp/08_dht11-lcd/main/panel_device.cpp
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@ -1,145 +0,0 @@
/*#############################################################################
## Author: Shaun Reed ##
## Legal: All Content (c) 2025 Shaun Reed, all rights reserved ##
## ##
## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com ##
##############################################################################
*/
#include "panel_device.h"
#include "display.h"
bool IPanelDevice::lvgl_flush_ready_cb(esp_lcd_panel_io_handle_t,
esp_lcd_panel_io_event_data_t *,
void *user_ctx)
{
auto *disp = (lv_display_t *) user_ctx;
lv_display_flush_ready(disp);
return false;
}
void IPanelDevice::lvgl_flush_cb(lv_display_t *display, const lv_area_t *area,
uint8_t *px_map) // NOLINT(*-non-const-parameter)
{
auto panel_handle =
(esp_lcd_panel_handle_t) lv_display_get_user_data(display);
// Necessary because LVGL reserves 2x4 bytes in the buffer for a palette.
// Since we are monochrome, we don't need these additional bytes.
// For more information about the monochrome, please refer to:
// https://docs.lvgl.io/9.2/porting/display.html#monochrome-displays
// Skip the palette here.
px_map += LVGL_PALETTE_SIZE;
uint16_t hor_res = lv_display_get_physical_horizontal_resolution(display);
int32_t x1 = area->x1;
int32_t x2 = area->x2;
int32_t y1 = area->y1;
int32_t y2 = area->y2;
// As of 03/01/2025 master branch of LVGL contains this helper for the same.
// https://docs.lvgl.io/master/API/draw/sw/lv_draw_sw_utils.html
// lv_draw_sw_i1_convert_to_vtiled()
for (int32_t y = y1; y <= y2; y++) {
for (int32_t x = x1; x <= x2; x++) {
// Get the byte offset of the pixel coordinates using horizontal-mapping.
int h_offset = Pixel::horizontal_byte_offset(x, y, hor_res);
// True if the pixel is lit, else false.
bool chroma_color = px_map[h_offset] & Pixel::msb_mask(x);
// We need an additional buffer for transposing the pixel data to the
// vertical format required by the display driver.
uint8_t *buf = IPanelDevice::get_additional_draw_buffer();
// Move to the position in the auxillary buffer where the pixel is stored.
buf += Pixel::vertical_byte_offset(x, y, hor_res);
// Write the single bit to the monochrome display mapped vertically.
// Take the Least Significant Bit mask of the Y coordinate to select the
// bit representing a pixel at position y in a vertically-mapped display.
if (chroma_color) {
// Set the vertically-mapped pixel to on.
*buf &= ~Pixel::lsb_mask(y);
} else {
// Set the vertically-mapped pixel to off.
*buf |= Pixel::lsb_mask(y);
}
}
}
// Pass the draw buffer to the driver.
ESP_ERROR_CHECK(
esp_lcd_panel_draw_bitmap(panel_handle, x1, y1, x2 + 1, y2 + 1,
IPanelDevice::get_additional_draw_buffer()));
}
void IPanelDevice::lvgl_increase_tick_cb(void *)
{
// Tell LVGL how many milliseconds has elapsed
lv_tick_inc(LVGL_TICK_PERIOD_MS);
}
[[noreturn]] void IPanelDevice::lvgl_port_task(void *)
{
// Optionally initialize some LVGL objects here before entering loop below.
ESP_LOGI(TAG, "Starting LVGL task");
for (uint32_t time_to_next_ms = 0; true; usleep(1000 * time_to_next_ms)) {
// Obtain LVGL API lock before calling any LVGL methods.
ScopedLock lock;
// Optionally handle LVGL input or event logic here.
// Update LVGL periodic timers.
time_to_next_ms = lv_timer_handler();
}
}
void IPanelDevice::register_rendering_data(lv_display_t *display_handle,
esp_lcd_panel_io_handle_t io_handle)
{
// Create draw buffer.
ESP_LOGI(TAG, "Allocate separate LVGL draw buffers");
lv_buf_ = heap_caps_calloc(1, lv_buf_size_,
MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT);
assert(lv_buf_);
ESP_LOGI(TAG, "Set LVGL draw buffers");
// Color format must be set first, LVGL9 support new monochromatic format.
lv_display_set_color_format(display_handle, LV_COLOR_FORMAT_I1);
lv_display_set_buffers(display_handle, lv_buf_, nullptr,
lv_buf_size_,
LV_DISPLAY_RENDER_MODE_FULL);
lv_display_set_rotation(display_handle, LV_DISPLAY_ROTATION_0);
ESP_LOGI(TAG, "Set LVGL callback for flushing to the display");
lv_display_set_flush_cb(display_handle, IPanelDevice::lvgl_flush_cb);
ESP_LOGI(TAG, "Register io panel callback for LVGL flush ready notification");
const esp_lcd_panel_io_callbacks_t cbs = {
.on_color_trans_done = IPanelDevice::lvgl_flush_ready_cb,
};
ESP_ERROR_CHECK(
esp_lcd_panel_io_register_event_callbacks(io_handle, &cbs,
display_handle));
}
void IPanelDevice::register_lvgl_tick_timer()
{
ESP_LOGI(TAG, "Use esp_timer to increase LVGL tick");
const esp_timer_create_args_t esp_timer_args = {
.callback = &IPanelDevice::lvgl_increase_tick_cb,
// Data to pass to the IPanelDevice::lvgl_port_task callback.
.arg = nullptr,
.name = "lvgl_tick",
};
Display::timers_.start_new_timer_periodic(esp_timer_args,
LVGL_TICK_PERIOD_MS * 1000);
// LVGL requires a FreeRTOS task for running it's event loop.
// The lvgl_port_task callback can update the UI or handle input logic.
// For this basic example we don't do either of these things.
ESP_LOGI(TAG, "Create LVGL FreeRTOS task");
// Optionally set user data to pass to LVGL's FreeRTOS task callback here.
void *user_data = nullptr;
xTaskCreate(lvgl_port_task, "LVGL", LVGL_TASK_STACK_SIZE,
user_data, LVGL_TASK_PRIORITY, nullptr);
}

435
esp/cpp/08_dht11-lcd/main/panel_device.h
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@ -1,435 +0,0 @@
/*#############################################################################
## Author: Shaun Reed ##
## Legal: All Content (c) 2025 Shaun Reed, all rights reserved ##
## ##
## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com ##
##############################################################################
*/
#ifndef PANEL_DEVICE_H
#define PANEL_DEVICE_H
#include <esp_lcd_panel_dev.h>
#include <esp_lcd_panel_ops.h>
#include <esp_lcd_panel_io.h>
#include <esp_log.h>
#include <display/lv_display.h>
#include "i2c.h"
// LVGL reserves 2x4 bytes in the buffer to be used as a palette.
// This additional space must be added to the IPanelDevice::buf_size_.
#define LVGL_PALETTE_SIZE 8
#define LVGL_TICK_PERIOD_MS 5
#define LVGL_TASK_STACK_SIZE (4 * 1024)
#define LVGL_TASK_PRIORITY 2
#define LCD_H_RES 128
#define LCD_V_RES 64
/**
* Wraps some foundational operations performed on pixel coordinates when
* dealing with pointer arithmetic. Most of these could be done ad-hoc as needed
* but using this helper reduces the risk of errors.
*/
struct Pixel {
/**
* Calculate byte offset for the pixel at [x,y] within a horizontally-mapped
* monochrome uint8 draw buffer, using the initialized horizontal resolution.
*
* We use `>> 3` because each pixel requires 1 bit, but each uint8 in the draw
* buffer can hold 8 bits. To find the uint8 value in our draw buffer that
* stores this pixel's value we must compensate for this when using pixel
* coordinates in byte math.
*
* Therefore, each uint8 in the draw buffer stores the state of 8 pixels.
* Below is an example of calculating for [x, y] pixel coordinates [20, 10].
* The example uses a horizontal resolution of 128.
*
* For the horizontal case, each row (y) of the image is represented by
* `hor_res >> 3` bytes (16). The byte-offset of the first pixel in the 10th
* row for example is `16 * 10` = 160.
*
* Since the pixels are stored horizontally we must calculate the 20th pixel
* column (x) as `160 + (20 >> 3)`, or `160 + (20 / 8)` to get a final offset
* of 162.
*
* @param x X pixel coordinate to find byte offset.
* @param y Y pixel coordinate to find byte offset.
* @param hor_res horizontal resolution of the display.
* @return byte offset for a single-byte monochrome pixel at [x,y].
*/
[[maybe_unused]] [[nodiscard]] static ptrdiff_t
horizontal_byte_offset(const int32_t &x, const int32_t &y,
const int32_t &hor_res = LCD_V_RES)
{
// Convert pixel (bit) coordinates to byte coordinates in the draw buffer.
return (hor_res >> 3) * y + (x >> 3);
}
/**
* Calculate byte offset for the pixel at [x,y] within a vertically-mapped
* monochrome uint8 draw buffer, using the initialized horizontal resolution.
*
* We use `>> 3` because each pixel requires 1 bit, but each uint8 in the draw
* buffer can hold 8 bits. To find the uint8 value in our draw buffer that
* stores this pixel's value we must compensate for this when using pixel
* coordinates in byte math.
*
* Therefore, each uint8 in the draw buffer stores the state of 8 pixels.
* Below is an example of calculating for [x, y] pixel coordinates [20, 10].
* The example uses a horizontal resolution of 128.
*
* For the vertical case, each row (y) of the image is represented by
* `hor_res` bytes (128) - one for each column (x). Because the pixels are
* stored vertically, the byte-offset of the first pixel in the 10th row is
* `128 * (10 >> 3)` or * `128 * (10 / 8)` = 128.
*
* From this location we can simply calculate the 20th pixel column (x) as
* `128 + 20` to get a final offset of 148, because the pixels are stored in a
* columnar format.
*
* @param x X pixel coordinate to find byte offset.
* @param y Y pixel coordinate to find byte offset.
* @param hor_res horizontal resolution of the display.
* @return byte offset for a single-byte monochrome pixel at [x,y].
*/
[[maybe_unused]] [[nodiscard]] static ptrdiff_t
vertical_byte_offset(const int32_t &x, const int32_t &y,
const int32_t &hor_res = LCD_V_RES)
{
// Convert pixel (bit) coordinates to byte coordinates in the draw buffer.
return hor_res * (y >> 3) + x;
}
/**
* Finds the Most Significant Bit location of bit `i` in a byte.
*
* MSB LSB
* bits 7 6 5 4 3 2 1 0
* data 8 7 6 5 4 3 2 1
* Left Right
*
* @return bitmask for MSB location of `i`.
*/
[[maybe_unused]] [[nodiscard]] static uint8_t
msb_mask(const int32_t &i) { return 1 << (7 - i % 8); }
/**
* Finds the Least Significant Bit location of bit `i` in a byte.
*
* LSB MSB
* bits 0 1 2 3 4 5 6 7
* data 1 2 3 4 5 6 7 8
* Left Right
*
* @return bitmask for LSB location of `i`.
*/
[[maybe_unused]] [[nodiscard]] static uint8_t
lsb_mask(const int32_t &i) { return 1 << (i % 8); }
};
/**
* Encapsulates vendor specific ESP LCD panel initialization logic.
* This pure virtual interface can be inherited from for using new LCD devices.
* See SSD1306 as an example to implement IPanelDevice for NT35510 or ST7789.
*
* At this time only I2C is supported.
* Classes that inherit from this interface should likely be marked final.
*/
class IPanelDevice {
public:
/**
* Construct an IPanelDevice.
*
* @param i2c I2C object. Eventually this will mature to IProtocol or similar.
* @param config I2C configuration for this device.
* @param height Height of the device screen in pixels.
* @param width Width of the device screen in pixels.
*/
explicit IPanelDevice(i2c_master_bus_handle_t &i2c,
esp_lcd_panel_io_i2c_config_t config,
int width,
int height) :
IPanelDevice(i2c, config, width, height,
width * height / 8 + LVGL_PALETTE_SIZE) { }
/**
* Construct an IPanelDevice.
*
* @param i2c I2C object. Eventually this will mature to IProtocol or similar.
* @param config I2C configuration for this device.
* @param height Height of the device screen in pixels.
* @param width Width of the device screen in pixels.
* @param draw_buf_size Size of the draw buffer for this device.
*/
explicit IPanelDevice(i2c_master_bus_handle_t &,
esp_lcd_panel_io_i2c_config_t io_config,
int width,
int height,
size_t draw_buf_size) :
width_(width),
height_(height),
rst_num_(-1),
lv_buf_size_(draw_buf_size),
esp_io_config_(io_config),
lv_buf_(nullptr) { }
virtual ~IPanelDevice() = default;
//
// PUBLIC METHODS
/**
* Create an LVGL display using the width and height of this device.
*
* @return Handle to the created LVGL display.
*/
[[nodiscard]] lv_display_t *create_display() const
{
auto display = lv_display_create(width_, height_);
assert(display);
return display;
}
/**
* Create an ESP LCD panel IO handle.
*
* @return The created ESP LCD panel IO handle.
*/
[[nodiscard]] esp_lcd_panel_io_handle_t create_io_handle()
{
ESP_LOGI(TAG, "Creating panel IO handle");
esp_lcd_panel_io_handle_t handle = nullptr;
ESP_ERROR_CHECK(
esp_lcd_new_panel_io_i2c(I2C_get(), &esp_io_config_, &handle));
return handle;
}
/**
* Create and initialize an ESP panel handle.
* IPanelDevice implementors must initialize the panel within init_panel.
*
* @param config ESP LCD panel configuration.
* @param io ESP LCD panel IO handle.
* @param [out] panel ESP LCD panel handle output pointer location.
*/
void create_panel(esp_lcd_panel_dev_config_t &config,
esp_lcd_panel_io_handle_t io,
esp_lcd_panel_handle_t &panel)
{
// If the passed handle is already allocated, delete it.
if (panel != nullptr) {
ESP_LOGI(TAG, "Removing unused panel");
esp_lcd_panel_del(panel);
}
ESP_LOGI(TAG, "Installing vendor panel driver");
// Call pure virtual method responsible for initializing the panel handle.
init_panel(config, io, panel);
}
/**
* Retrieve the device specific vendor configuration structure.
*
* @return Address of vendor configuration structure.
* @sa SSD1306::vendor_config
*/
virtual void *vendor_config() = 0;
/**
* Registers LVGL draw buffers and callbacks for this display.
*
* An implementation of the interface can optionally override this method to
* provide custom LVGL callbacks and display configurations.
*
* @param display_handle LVGL display handle to use for rendering.
* @param io_handle IO handle for the ESP LCD panel.
*/
virtual void register_rendering_data(lv_display_t *display_handle,
esp_lcd_panel_io_handle_t io_handle);
/**
* Registers LVGL ticker timer callback for rendering this display.
*
* An implementation of the interface can optionally override this method to
* provide custom LVGL callbacks and tick configurations.
*/
virtual void register_lvgl_tick_timer();
//
// PUBLIC MEMBERS
/// Width of the device screen in pixels.
int32_t width_;
/// Height of the device screen in pixels.
int32_t height_;
/// RST GPIO pin number.
int rst_num_;
/// LVGL draw buffer size for the device.
size_t lv_buf_size_;
/// ESP LCD panel IO configuration.
esp_lcd_panel_io_i2c_config_t esp_io_config_;
protected:
/**
* Static accessor to a static buffer to store draw buffer data for the panel.
*
* This method is protected to allow an implementation to provide a custom
* callback method similar to IPanelDevice::lvgl_flush_cb.
*
* The buffer is allocated statically within the scope of this function to
* allow creating multiple panels that _each_ manage their own statically
* allocated draw buffer data. This simplifies implementing the interface by
* taking this responsibility off of the implementor. The buffer will only be
* allocated if this method is called, so the memory is only used if required.
*
* @return Pointer to uint8 draw buffer data.
* @sa register_rendering_data for overriding LVGL rendering callbacks.
*/
static uint8_t *get_additional_draw_buffer()
{
// Static to the scope of this function, not the compilation unit.
// For LV_COLOR_FORMAT_I1 we need an extra buffer to hold converted data.
static uint8_t oled_buffer[LCD_H_RES * LCD_V_RES / 8];
return oled_buffer;
}
private:
//
// PRIVATE METHODS
/**
* Initializes the ESP panel using vendor specific APIs and configurations.
* This method should implement any setup logic specific to the device.
*
* @param config ESP LCD panel configuration.
* @param io ESP LCD panel IO handle.
* @param [out] panel ESP LCD panel handle output pointer location.
*/
virtual void init_panel(esp_lcd_panel_dev_config_t &config,
esp_lcd_panel_io_handle_t io,
esp_lcd_panel_handle_t &panel) = 0;
//
// PRIVATE STATIC METHODS
/**
* The callback invoked when panel IO finishes transferring color data.
* This signals that the panel is ready to flush image data to the display.
*
* @param panel LCD panel IO handles.
* @param data Panel IO event data, fed by driver.
* @param user_ctx User data, passed from `esp_lcd_panel_io_xxx_config_t`.
* @return Whether a high priority task has been waken up by this function.
* @sa SSD1306::SSD1306 for setting user_ctx data passed to the callback.
* @sa register_rendering_data for overriding this callback.
*/
static bool lvgl_flush_ready_cb(esp_lcd_panel_io_handle_t panel,
esp_lcd_panel_io_event_data_t *data,
void *user_ctx);
/**
* The callback invoked for flushing the rendered image to the display.
*
* `px_map` contains the rendered image as raw pixel map and it should be
* copied to `area` on the display.
*
* The following details are crucial for understanding the logic surrounding
* flushing to the display in this example.
*
* The order of bits within the px_map from _LVGL_ is MSB first.
* MSB LSB
* bits 7 6 5 4 3 2 1 0
* pixels 0 1 2 3 4 5 6 7
* Left Right
*
* The bytes from _LVGL_ are mapped to pixel rows of the display
* 8 bits (pixels) per byte -
* [0, 0, 0, 0, 0, 0, 0, 0]
* [0, 0, 0, 0, 0, 0, 0, 0]
* [0, 0, 0, 0, 0, 0, 0, 0]
*
* The order of bits expected by the _display driver_ is LSB first.
* We must preserve pairing of each bit and pixel when writing to the display.
* LSB MSB
* bits 0 1 2 3 4 5 6 7
* pixels 7 6 5 4 3 2 1 0
* Left Right
*
* Bytes expected by the _display driver_ map to pixel columns of the display.
* 8 bits (pixels) per byte -
* [0, [0, [0, [0,
* 0, 0, 0, 0,
* 0, 0, 0, 0,
* 0, 0, 0, 0,
* 0, 0, 0, 0,
* 0, 0, 0, 0,
* 0, 0, 0, 0,
* 0] 0] 0] 0]
*
* These layouts in memory have no opinion on the shape of the image. The
* beginning and end of a row or a column for example is entirely dependent
* on how the data is accessed. The vertical and horitzontal resolution may
* vary between displays.
*
* For the LV_COLOR_FORMAT_I1 color format we are using, an additional buffer
* is needed for transposing the bits to the vertical arrangement required by
* the display driver that is outlined above.
*
* This callback implementation is an example of handling this transposition
* and flushing the data to the display in the expected format.
*
* @param display LVGL display handle to use for rendering.
* @param area Area of the display being flushed.
* @param px_map Rendered image data for writing to the display area.
* @sa register_rendering_data for overriding this callback.
* @sa get_additional_draw_buffer
*/
static void lvgl_flush_cb(lv_display_t *display,
const lv_area_t *area,
uint8_t *px_map);
/**
* Callback invoked for every period of the timer.
*
* This callback _must_ call lv_tick_inc to inform LVGL how much time has
* elapsed since the last period of the timer.
*
* @param data User data passed to the callback.
* @sa register_lvgl_tick_timer for setting user data and the tick period of
* the timer, or overriding this callback entirely.
*/
static void lvgl_increase_tick_cb(void *data);
/**
* FreeRTOS task callback invoked for handling LVGL events or updating the UI.
*
* This function is intentionally an endless loop and should never return.
* LVGL initialization logic can optionally be added before entering the loop.
* Input logic can optionally be handled within the loop.
*
* This callback _must_ call lv_timer_handler to handle LVGL periodic timers.
*
* @param data User data passed to the callback.
* @sa register_lvgl_tick_timer for overriding this callback.
*/
[[noreturn]] static void lvgl_port_task(void *data);
//
// PRIVATE MEMBERS
/// LVGL draw buffer associated with this Display's lv_display_t.
void *lv_buf_;
/// Tag used for ESP logging.
constexpr static const char *TAG = "IPanelDevice";
};
#endif // PANEL_DEVICE_H

28
esp/cpp/08_dht11-lcd/main/scoped_lock.h
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@ -1,28 +0,0 @@
/*#############################################################################
## Author: Shaun Reed ##
## Legal: All Content (c) 2025 Shaun Reed, all rights reserved ##
## ##
## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com ##
##############################################################################
*/
#ifndef SCOPED_LOCK_H
#define SCOPED_LOCK_H
#include <mutex>
/**
* Obtains LVGL API mutex lock for the duration of local scope.
*
* LVGL library is not thread-safe, this lock should be held when making calls
* to the LVGL API, and released as soon as possible when finished.
*/
struct ScopedLock {
explicit ScopedLock() { _lock_acquire(&lv_lock_); }
~ScopedLock() { _lock_release(&lv_lock_); }
/// Mutex used to protect LVGL API calls.
static _lock_t lv_lock_;
};
#endif // SCOPED_LOCK_H

0
esp/cpp/08_dht11-lcd/main/ssd1306.h
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161
esp/cpp/08_dht11-lcd/main/time_keeper.h
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@ -1,161 +0,0 @@
/*#############################################################################
## Author: Shaun Reed ##
## Legal: All Content (c) 2025 Shaun Reed, all rights reserved ##
## ##
## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com ##
##############################################################################
*/
#ifndef TIME_KEEPER_H
#define TIME_KEEPER_H
#include <esp_log.h>
#include <esp_timer.h>
#include "i2c.h"
/**
* Stores arguments and ESP timer handle for a Timer.
* In general Timers should be used via the TimeKeeper interface only.
*
* Timers cannot be copied, and are only created by a TimeKeeper instance.
* The TimeKeeper can delete existing Timers, calling it's destructor.
* The ESP timer will be deleted when this class desctructor is called.
*/
struct Timer {
explicit Timer(esp_timer_create_args_t args) :
args_(args), esp_timer_(nullptr)
{
ESP_LOGI(TAG, "Creating esp_timer with name: '%s'", args_.name);
ESP_ERROR_CHECK(esp_timer_create(&args, &esp_timer_));
}
~Timer()
{
ESP_LOGI(TAG, "Destroying esp_timer with name: '%s'", args_.name);
ESP_ERROR_CHECK(esp_timer_delete(esp_timer_));
}
Timer(const Timer &) = delete;
Timer(Timer &) = delete;
Timer &operator=(Timer &) = delete;
//
// PUBLIC MEMBERS
/// Arguments passed to ESP API during timer creation.
esp_timer_create_args_t args_;
/// ESP timer handle.
esp_timer_handle_t esp_timer_;
private:
//
// PRIVATE MEMBERS
/// Tag used for ESP logging.
constexpr static const char *TAG = "Timer";
};
/**
* ESP timer mananger class.
*
* Timers should only be accessed using the get_handle method.
* If the Timer destructor is called the underlying ESP timer will be deleted.
*/
struct TimeKeeper {
/// Timer handle type used for referring to Timers.
using TimerHandle = Timer *;
//
// GETTERS
TimerHandle get_handle(const char *name)
{
return &managed_timers_.at(name);
}
TimerHandle operator[](const char *name) { return get_handle(name); }
//
// PUBLIC METHODS
/**
* Create a new managed Timer with the provided ESP arguments.
* The timer can be retrieved later using the args.name field value.
*
* @param args ESP timer creation arguments.
* @return TimerHandle Handle to a Timer managed by this TimeKeeper.
* @sa get_handle
* @sa operator[](const char*)
*/
[[maybe_unused]] TimerHandle create_timer(esp_timer_create_args_t args)
{
auto rt = managed_timers_.emplace(args.name, args);
if (!rt.second) {
ESP_LOGE(TAG, "Timer already exists with name '%s'", args.name);
return nullptr;
}
return &rt.first->second;
}
/// Stop a Timer with the given name.
[[maybe_unused]] void stop_timer(const char *name)
{
ESP_ERROR_CHECK(esp_timer_stop(get_handle(name)->esp_timer_));
}
/// Delete a Timer with the given name.
[[maybe_unused]] void delete_timer(const char *name)
{
if (managed_timers_.erase(name) == 0) {
ESP_LOGE(TAG, "Attempt to delete timer that does not exist: '%s'", name);
}
}
/// Create a Timer with the ESP args and call esp_timer_start_periodic.
[[maybe_unused]] void
start_new_timer_periodic(esp_timer_create_args_t args,
uint64_t period)
{
start_timer_periodic(create_timer(args)->args_.name, period);
}
/// Calls esp_timer_start_periodic on the Timer with the given name.
[[maybe_unused]] void start_timer_periodic(const char *name,
uint64_t period)
{
ESP_ERROR_CHECK(
esp_timer_start_periodic(get_handle(name)->esp_timer_, period));
}
/// Create a Timer with the ESP args and call esp_timer_start_once.
[[maybe_unused]] void start_new_timer_once(esp_timer_create_args_t args,
uint64_t timeout_us)
{
start_timer_once(create_timer(args)->args_.name, timeout_us);
}
/// Calls esp_timer_start_once on the Timer with the given name.
[[maybe_unused]] void start_timer_once(const char *name,
uint64_t timeout_us)
{
ESP_ERROR_CHECK(
esp_timer_start_once(get_handle(name)->esp_timer_, timeout_us));
}
private:
//
// PRIVATE MEMBERS
/// Existing ESP timers created for this TimeKeeper instance.
std::unordered_map<const char *, Timer> managed_timers_;
/// Tag used for ESP logging.
constexpr static const char *TAG = "TimeKeeper";
};
#endif // TIME_KEEPER_H

47
esp/cpp/README.md
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@ -20,3 +20,50 @@ All examples after `04_esp-idf-arduino` are built with cmake and the [ESP-IDF](h
[Arduino ESP32 GitHub](https://github.com/espressif/arduino-esp32) \ [Arduino ESP32 GitHub](https://github.com/espressif/arduino-esp32) \
[Arduino ESP32 API reference](https://docs.espressif.com/projects/arduino-esp32/en/latest/libraries.html) [Arduino ESP32 API reference](https://docs.espressif.com/projects/arduino-esp32/en/latest/libraries.html)
If you are working in CLion, I recommend reading [this article](https://developer.espressif.com/blog/clion/) to get started.
Basic instructions for installing the ESP-IDF and creating a project are below.
## Dependencies
Install the [ESP-IDF](https://github.com/espressif/esp-idf?tab=readme-ov-file#setup-build-environment)
```bash
# https://docs.espressif.com/projects/esp-idf/en/v5.3.2/esp32/get-started/linux-macos-setup.html#for-linux-users
sudo apt-get install -y git wget flex bison gperf python3 python3-pip python3-venv cmake ninja-build ccache libffi-dev libssl-dev dfu-util libusb-1.0-0
git clone --recursive https://github.com/espressif/esp-idf
cd esp-idf
./install.sh
. ./export.sh
```
In CLion there is an official [Serial Monitor](https://plugins.jetbrains.com/plugin/8031-serial-port-monitor) plugin, or use ESP-IDF -
```bash
idf.py monitor -b 115200
```
## Starting Over
To set up this project from scratch the following commands were used
```bash
source /path/to/esp-idf/export.sh
idf.py create-project my-project
cd my-project
idf.py set-target esp32
idf.py add-dependency "espressif/arduino-esp32^3.1.1"
# Autostart Arduino for use of `loop()` and `setup()` functions
# You can also use the esp-idf `app_main()` function if preferred
# https://docs.espressif.com/projects/arduino-esp32/en/latest/esp-idf_component.html#configuration
# You can alternatively do this in the GUI tool `idf.py menuconfig`
echo "CONFIG_AUTOSTART_ARDUINO=y" >> sdkconfig
sed -i -e 's/CONFIG_FREERTOS_HZ=100/CONFIG_FREERTOS_HZ=1000/' sdkconfig
# Build the project
idf.py build
```
To set this project up in CLion, see [JetBrains documentation](https://www.jetbrains.com/help/clion/esp-idf.html#env-vars).

0
esp/cpp/components/i2c.h
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2
esp/cpp/components/i2c/i2c.c
View File

@ -1,2 +1,2 @@
#include <stdio.h>
#include "i2c.h" #include "i2c.h"
#include <stdio.h>

14
esp/cpp/components/i2c/include/i2c.h
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@ -10,8 +10,8 @@
#define I2C_BUS_PORT 0 #define I2C_BUS_PORT 0
#include <esp_log.h>
#include <driver/i2c_master.h> #include <driver/i2c_master.h>
#include <esp_log.h>
/// Tag used for ESP logging. /// Tag used for ESP logging.
static const char* I2C_TAG = "I2C component"; static const char* I2C_TAG = "I2C component";
@ -22,7 +22,7 @@ static const char* I2C_TAG = "I2C component";
* *
* @param config ESP I2C master bus configuration. * @param config ESP I2C master bus configuration.
*/ */
inline void I2C_config_init(const i2c_master_bus_config_t config) static void I2C_config_init(const i2c_master_bus_config_t config)
{ {
i2c_master_bus_handle_t i2c; i2c_master_bus_handle_t i2c;
ESP_LOGI(I2C_TAG, "Initializing new master I2C bus"); ESP_LOGI(I2C_TAG, "Initializing new master I2C bus");
@ -36,7 +36,7 @@ inline void I2C_config_init(const i2c_master_bus_config_t config)
* @param sda GPIO pin for SDA * @param sda GPIO pin for SDA
* @param scl GPIO pin for SCL * @param scl GPIO pin for SCL
*/ */
inline void I2C_init(gpio_num_t sda, gpio_num_t scl) static void I2C_init(gpio_num_t sda, gpio_num_t scl)
{ {
return I2C_config_init((i2c_master_bus_config_t){ return I2C_config_init((i2c_master_bus_config_t){
.i2c_port = I2C_BUS_PORT, .i2c_port = I2C_BUS_PORT,
@ -44,11 +44,11 @@ inline void I2C_init(gpio_num_t sda, gpio_num_t scl)
.scl_io_num = scl, .scl_io_num = scl,
.clk_source = I2C_CLK_SRC_DEFAULT, .clk_source = I2C_CLK_SRC_DEFAULT,
.glitch_ignore_cnt = 7, .glitch_ignore_cnt = 7,
.flags = { .flags =
{
.enable_internal_pullup = true, .enable_internal_pullup = true,
}, },
} });
);
} }
/** /**
@ -62,4 +62,4 @@ static i2c_master_bus_handle_t I2C_get()
return i2c; return i2c;
} }
#endif //I2C_H #endif // I2C_H

5
esp/cpp/components/lcd/CMakeLists.txt Normal file
View File

@ -0,0 +1,5 @@
idf_component_register(
SRCS lcd.c panel_device.cpp
include/lcd.h include/panel_device.h
INCLUDE_DIRS "include"
)

9
esp/cpp/components/lcd/idf_component.yml Normal file
View File

@ -0,0 +1,9 @@
version: 0.0.1
description: ESP LCD display helper component
url: https://git.shaunreed.com/shaunrd0/klips/tree/master/esp/cpp/components/lcd
dependencies:
idf: '>=5.3'
lvgl/lvgl: 9.2.0
espressif/esp_lcd_sh1107: ==1.0.0
i2c:
path: ../../components/i2c

171
esp/cpp/components/lcd/include/lcd.h Normal file
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@ -0,0 +1,171 @@
/*#############################################################################
## Author: Shaun Reed ##
## Legal: All Content (c) 2025 Shaun Reed, all rights reserved ##
## ##
## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com ##
##############################################################################
*/
#ifndef DISPLAY_H
#define DISPLAY_H
#include <lv_init.h>
#include <widgets/label/lv_label.h>
#include "i2c.h"
#include "panel_device.h"
#include <esp_lcd_panel_ops.h>
#include <esp_lcd_types.h>
// According to specific display hardware.
// https://www.digikey.com/en/products/detail/winstar-display/WEA012864DWPP3N00003/20533255
#define SCREEN_WIDTH 128 // OLED display width, in pixels.
#define SCREEN_HEIGHT 64 // OLED display height, in pixels.
// According to SSD1306 datasheet.
// https://cdn-shop.adafruit.com/datasheets/SSD1306.pdf
#define I2C_HW_ADDR 0x3C
#define LCD_PIXEL_CLOCK_HZ (400 * 1000)
// Bit number used to represent command and parameter
#define LCD_CMD_BITS 8
#define LCD_PARAM_BITS 8
/// Tag used for ESP logging.
static const char* LCD_TAG = "LCD component";
static _lock_t lv_lock_;
struct LCD
{
esp_lcd_panel_handle_t esp_panel_;
esp_lcd_panel_io_handle_t esp_io_;
/// LVGL display handle.
lv_display_t* lv_display_;
// TODO: Should be a dynamic array.
lv_obj_t* lv_objects_;
struct IPanelDevice* device_;
};
/**
* Construct a new Display using an object that implements IPanelDevice.
*
* @param device An object that implements the IPanelDevice interface.
*/
static struct LCD LCD_init(struct IPanelDevice* device)
{
struct LCD display;
ESP_LOGI(LCD_TAG, "Creating panel IO handle");
display.esp_io_ = NULL;
esp_lcd_panel_dev_config_t panel_config = {
.reset_gpio_num = (gpio_num_t)(-1),
.bits_per_pixel = 1,
.vendor_config = device->vendor_config_cb(),
};
esp_lcd_panel_io_i2c_config_t io_config = {
.dev_addr = I2C_HW_ADDR,
// User data to pass to the LVGL flush_ready callback.
// See IPanelDevice::lvgl_flush_ready_cb
.user_ctx = NULL,
.control_phase_bytes = 1,
.dc_bit_offset = 6,
.lcd_cmd_bits = LCD_CMD_BITS,
.lcd_param_bits = LCD_PARAM_BITS,
.scl_speed_hz = LCD_PIXEL_CLOCK_HZ,
};
ESP_ERROR_CHECK(
esp_lcd_new_panel_io_i2c(I2C_get(), &io_config, &display.esp_io_));
// If the passed handle is already allocated, delete it.
if (display.esp_panel_ != NULL)
{
ESP_LOGI(LCD_TAG, "Removing unused panel");
esp_lcd_panel_del(display.esp_panel_);
}
ESP_LOGI(LCD_TAG, "Installing vendor panel driver");
device->init_panel_cb(&panel_config, display.esp_io_, &display.esp_panel_);
ESP_LOGI(LCD_TAG, "Resetting panel display");
ESP_ERROR_CHECK(esp_lcd_panel_reset(display.esp_panel_));
ESP_LOGI(LCD_TAG, "Initializing panel display");
ESP_ERROR_CHECK(esp_lcd_panel_init(display.esp_panel_));
ESP_LOGI(LCD_TAG, "Turning on panel display");
ESP_ERROR_CHECK(esp_lcd_panel_disp_on_off(display.esp_panel_, true));
if (!lv_is_initialized())
{
ESP_LOGI(LCD_TAG, "Initialize LVGL");
lv_init();
}
ESP_LOGI(LCD_TAG, "Creating LVGL display");
display.lv_display_ = lv_display_create(device->width_, device->height_);
// assert(display.lv_display_);
// associate the i2c panel handle to the display
lv_display_set_user_data(display.lv_display_, display.esp_panel_);
device->register_rendering_data_cb(display.lv_display_, display.esp_io_,
device->lv_buf_, device->lv_buf_size_);
device->register_lvgl_tick_timer_cb();
return display;
}
/**
* Create a LVGL label with some given text on the current display.
* The name of the object can be reused to change text on this label later.
*
* @param display
* @param text Text to write to the display.
* @param name Name for the LVGL label object associated with this text.
* @param long_mode LVGL long mode for text wider than the current display.
* @param align LVGL alignment to use for placing the label on the display.
*/
static void LCD_set_text_with_mode(struct LCD* display, const char* text,
const char* name,
lv_label_long_mode_t long_mode,
lv_align_t align)
{
// Lock the mutex due to the LVGL APIs are not thread-safe.
_lock_acquire(&lv_lock_);
ESP_LOGI(LCD_TAG, "Display LVGL Scroll Text");
lv_obj_t* scr = lv_display_get_screen_active(display->lv_display_);
// Create the label if it's `name` doesn't already exist in the map keys.
display->lv_objects_ = lv_label_create(scr);
// Set text and long mode.
lv_label_set_long_mode(display->lv_objects_, long_mode);
lv_label_set_text(display->lv_objects_, text);
// Set the size of the screen.
// If you use rotation 90 or 270 use lv_display_get_vertical_resolution.
lv_obj_set_width(
display->lv_objects_,
lv_display_get_horizontal_resolution(display->lv_display_));
lv_obj_align(display->lv_objects_, align, 0, 0);
_lock_release(&lv_lock_);
}
/**
* Create a LVGL label with some given text on the current display.
* The name of the object can be reused to change text on this label later.
*
* @param display
* @param text Text to write to the display.
* @param name Name for the LVGL label object associated with this text.
*/
static void LCD_set_text(struct LCD* display, const char* text,
const char* name)
{
LCD_set_text_with_mode(display, text, name, LV_LABEL_LONG_SCROLL_CIRCULAR,
LV_ALIGN_TOP_MID);
}
#endif // DISPLAY_H

360
esp/cpp/components/lcd/include/panel_device.h Normal file
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@ -0,0 +1,360 @@
/*#############################################################################
## Author: Shaun Reed ##
## Legal: All Content (c) 2025 Shaun Reed, all rights reserved ##
## ##
## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com ##
##############################################################################
*/
#ifndef PANEL_DEVICE_H
#define PANEL_DEVICE_H
#include <esp_lcd_panel_dev.h>
#include <esp_lcd_panel_io.h>
#include <esp_log.h>
#include <display/lv_display.h>
// LVGL reserves 2x4 bytes in the buffer to be used as a palette.
// This additional space must be added to the IPanelDevice::buf_size_.
#define LVGL_PALETTE_SIZE 8
#define LVGL_TICK_PERIOD_MS 5
#define LVGL_TASK_STACK_SIZE (4 * 1024)
#define LVGL_TASK_PRIORITY 2
#define LCD_H_RES 128
#define LCD_V_RES 64
/**
* Calculate byte offset for the pixel at [x,y] within a horizontally-mapped
* monochrome uint8 draw buffer, using the initialized horizontal resolution.
*
* We use `>> 3` because each pixel requires 1 bit, but each uint8 in the draw
* buffer can hold 8 bits. To find the uint8 value in our draw buffer that
* stores this pixel's value we must compensate for this when using pixel
* coordinates in byte math.
*
* Therefore, each uint8 in the draw buffer stores the state of 8 pixels.
* Below is an example of calculating for [x, y] pixel coordinates [20, 10].
* The example uses a horizontal resolution of 128.
*
* For the horizontal case, each row (y) of the image is represented by
* `hor_res >> 3` bytes (16). The byte-offset of the first pixel in the 10th
* row for example is `16 * 10` = 160.
*
* Since the pixels are stored horizontally we must calculate the 20th pixel
* column (x) as `160 + (20 >> 3)`, or `160 + (20 / 8)` to get a final offset
* of 162.
*
* @param x X pixel coordinate to find byte offset.
* @param y Y pixel coordinate to find byte offset.
* @param hor_res horizontal resolution of the display.
* @return byte offset for a single-byte monochrome pixel at [x,y].
*/
static ptrdiff_t horizontal_byte_offset_long(const int32_t x, const int32_t y,
const int32_t hor_res)
{
// Convert pixel (bit) coordinates to byte coordinates in the draw buffer.
return (hor_res >> 3) * y + (x >> 3);
}
static ptrdiff_t horizontal_byte_offset(const int32_t x, const int32_t y)
{
return horizontal_byte_offset_long(x, y, LCD_V_RES);
}
/**
* Calculate byte offset for the pixel at [x,y] within a vertically-mapped
* monochrome uint8 draw buffer, using the initialized horizontal resolution.
*
* We use `>> 3` because each pixel requires 1 bit, but each uint8 in the draw
* buffer can hold 8 bits. To find the uint8 value in our draw buffer that
* stores this pixel's value we must compensate for this when using pixel
* coordinates in byte math.
*
* Therefore, each uint8 in the draw buffer stores the state of 8 pixels.
* Below is an example of calculating for [x, y] pixel coordinates [20, 10].
* The example uses a horizontal resolution of 128.
*
* For the vertical case, each row (y) of the image is represented by
* `hor_res` bytes (128) - one for each column (x). Because the pixels are
* stored vertically, the byte-offset of the first pixel in the 10th row is
* `128 * (10 >> 3)` or * `128 * (10 / 8)` = 128.
*
* From this location we can simply calculate the 20th pixel column (x) as
* `128 + 20` to get a final offset of 148, because the pixels are stored in a
* columnar format.
*
* @param x X pixel coordinate to find byte offset.
* @param y Y pixel coordinate to find byte offset.
* @param hor_res horizontal resolution of the display.
* @return byte offset for a single-byte monochrome pixel at [x,y].
*/
static ptrdiff_t vertical_byte_offset_long(const int32_t x, const int32_t y,
const int32_t hor_res)
{
// Convert pixel (bit) coordinates to byte coordinates in the draw buffer.
return hor_res * (y >> 3) + x;
}
static ptrdiff_t vertical_byte_offset(const int32_t x, const int32_t y)
{
return vertical_byte_offset_long(x, y, LCD_V_RES);
}
/**
* Finds the Most Significant Bit location of bit `i` in a byte.
*
* MSB LSB
* bits 7 6 5 4 3 2 1 0
* data 8 7 6 5 4 3 2 1
* Left Right
*
* @return bitmask for MSB location of `i`.
*/
static uint8_t msb_mask(const int32_t i) { return 1 << (7 - i % 8); }
/**
* Finds the Least Significant Bit location of bit `i` in a byte.
*
* LSB MSB
* bits 0 1 2 3 4 5 6 7
* data 1 2 3 4 5 6 7 8
* Left Right
*
* @return bitmask for LSB location of `i`.
*/
static uint8_t lsb_mask(const int32_t i) { return 1 << (i % 8); }
static uint8_t* get_additional_draw_buffer()
{
// Static to the scope of this function, not the compilation unit.
// For LV_COLOR_FORMAT_I1 we need an extra buffer to hold converted data.
static uint8_t oled_buffer[LCD_H_RES * LCD_V_RES / 8];
return oled_buffer;
}
/**
* Retrieve the device specific vendor configuration structure.
*
* @return Address of vendor configuration structure.
*/
typedef void* (*vendor_config_cb_t)();
/**
* Registers LVGL ticker timer callback for rendering this display.
*
* An implementation of the interface can optionally override this method to
* provide custom LVGL callbacks and tick configurations.
*/
typedef void (*register_lvgl_tick_timer_cb_t)();
/**
* Initializes the ESP panel using vendor specific APIs and configurations.
* This method should implement any setup logic specific to the device.
*
* @param config ESP LCD panel configuration.
* @param io ESP LCD panel IO handle.
* @param [out] panel ESP LCD panel handle output pointer location.
*/
typedef void (*init_panel_cb_t)(esp_lcd_panel_dev_config_t* config,
esp_lcd_panel_io_handle_t io,
esp_lcd_panel_handle_t* panel);
/**
* Registers LVGL draw buffers and callbacks for this display.
*
* An implementation of the interface can optionally override this method to
* provide custom LVGL callbacks and display configurations.
*
* @param display_handle LVGL display handle to use for rendering.
* @param io_handle IO handle for the ESP LCD panel.
*/
typedef void (*register_rendering_data_cb_t)(
lv_display_t* display_handle, esp_lcd_panel_io_handle_t io_handle, void*,
size_t);
/**
* Encapsulates vendor specific ESP LCD panel initialization logic.
* This pure virtual interface can be inherited from for using new LCD devices.
* See SSD1306 as an example to implement IPanelDevice for NT35510 or ST7789.
*
* At this time only I2C is supported.
* Classes that inherit from this interface should likely be marked final.
*/
struct IPanelDevice
{
/// Width of the device screen in pixels.
int32_t width_;
/// Height of the device screen in pixels.
int32_t height_;
/// RST GPIO pin number.
int rst_num_;
/// LVGL draw buffer size for the device.
size_t lv_buf_size_;
/// ESP LCD panel IO configuration.
esp_lcd_panel_io_i2c_config_t esp_io_config_;
/// LVGL draw buffer associated with this Display's lv_display_t.
void* lv_buf_;
/// Callback used to initialize the ESP panel.
/// TODO: Assert by default?
init_panel_cb_t init_panel_cb;
/// Callback used to register LVGL tick timer.
register_lvgl_tick_timer_cb_t register_lvgl_tick_timer_cb;
/// Callback used to register LVGL draw buffers.
register_rendering_data_cb_t register_rendering_data_cb;
/// Callback used to fetch the display vendor configuration.
vendor_config_cb_t vendor_config_cb;
};
/**
* Static accessor to a static buffer to store draw buffer data for the panel.
*
* This method is protected to allow an implementation to provide a custom
* callback method similar to IPanelDevice::lvgl_flush_cb.
*
* The buffer is allocated statically within the scope of this function to
* allow creating multiple panels that _each_ manage their own statically
* allocated draw buffer data. This simplifies implementing the interface by
* taking this responsibility off of the implementor. The buffer will only be
* allocated if this method is called, so the memory is only used if required.
*
* @return Pointer to uint8 draw buffer data.
* @sa register_rendering_data for overriding LVGL rendering callbacks.
*/
/**
* The callback invoked when panel IO finishes transferring color data.
* This signals that the panel is ready to flush image data to the display.
*
* @param panel LCD panel IO handles.
* @param data Panel IO event data, fed by driver.
* @param user_ctx User data, passed from `esp_lcd_panel_io_xxx_config_t`.
* @return Whether a high priority task has been waken up by this function.
* @sa register_rendering_data for overriding this callback.
*/
static bool lvgl_flush_ready_cb(esp_lcd_panel_io_handle_t panel,
esp_lcd_panel_io_event_data_t* data,
void* user_ctx);
/**
* The callback invoked for flushing the rendered image to the display.
*
* `px_map` contains the rendered image as raw pixel map and it should be
* copied to `area` on the display.
*
* The following details are crucial for understanding the logic surrounding
* flushing to the display in this example.
*
* The order of bits within the px_map from _LVGL_ is MSB first.
* MSB LSB
* bits 7 6 5 4 3 2 1 0
* pixels 0 1 2 3 4 5 6 7
* Left Right
*
* The bytes from _LVGL_ are mapped to pixel rows of the display
* 8 bits (pixels) per byte -
* [0, 0, 0, 0, 0, 0, 0, 0]
* [0, 0, 0, 0, 0, 0, 0, 0]
* [0, 0, 0, 0, 0, 0, 0, 0]
*
* The order of bits expected by the _display driver_ is LSB first.
* We must preserve pairing of each bit and pixel when writing to the display.
* LSB MSB
* bits 0 1 2 3 4 5 6 7
* pixels 7 6 5 4 3 2 1 0
* Left Right
*
* Bytes expected by the _display driver_ map to pixel columns of the display.
* 8 bits (pixels) per byte -
* [0, [0, [0, [0,
* 0, 0, 0, 0,
* 0, 0, 0, 0,
* 0, 0, 0, 0,
* 0, 0, 0, 0,
* 0, 0, 0, 0,
* 0, 0, 0, 0,
* 0] 0] 0] 0]
*
* These layouts in memory have no opinion on the shape of the image. The
* beginning and end of a row or a column for example is entirely dependent
* on how the data is accessed. The vertical and horitzontal resolution may
* vary between displays.
*
* For the LV_COLOR_FORMAT_I1 color format we are using, an additional buffer
* is needed for transposing the bits to the vertical arrangement required by
* the display driver that is outlined above.
*
* This callback implementation is an example of handling this transposition
* and flushing the data to the display in the expected format.
*
* @param display LVGL display handle to use for rendering.
* @param area Area of the display being flushed.
* @param px_map Rendered image data for writing to the display area.
* @sa register_rendering_data for overriding this callback.
* @sa get_additional_draw_buffer
*/
static void lvgl_flush_cb(lv_display_t* display, const lv_area_t* area,
uint8_t* px_map);
/**
* Callback invoked for every period of the timer.
*
* This callback _must_ call lv_tick_inc to inform LVGL how much time has
* elapsed since the last period of the timer.
*
* @param data User data passed to the callback.
* @sa register_lvgl_tick_timer for setting user data and the tick period of
* the timer, or overriding this callback entirely.
*/
static void lvgl_increase_tick_cb(void* data);
/**
* FreeRTOS task callback invoked for handling LVGL events or updating the UI.
*
* This function is intentionally an endless loop and should never return.
* LVGL initialization logic can optionally be added before entering the loop.
* Input logic can optionally be handled within the loop.
*
* This callback _must_ call lv_timer_handler to handle LVGL periodic timers.
*
* @param data User data passed to the callback.
* @sa register_lvgl_tick_timer for overriding this callback.
*/
[[noreturn]] static void lvgl_port_task(void* data);
/**
* Registers LVGL ticker timer callback for rendering this display.
*
* An implementation of the interface can optionally override this method to
* provide custom LVGL callbacks and tick configurations.
*/
void register_lvgl_tick_timer();
void register_rendering_data(lv_display_t* display_handle,
esp_lcd_panel_io_handle_t io_handle, void* lv_buf,
size_t lv_buf_size);
inline struct IPanelDevice LCD_new_panel()
{
return (struct IPanelDevice){
.width_ = LCD_H_RES,
.height_ = LCD_V_RES,
.rst_num_ = -1,
.init_panel_cb = NULL, // Must be assigned by caller
.register_lvgl_tick_timer_cb = register_lvgl_tick_timer,
.register_rendering_data_cb = register_rendering_data,
.vendor_config_cb = NULL, // Must be assigned by caller
};
}
#endif // PANEL_DEVICE_H

5
esp/cpp/08_dht11-lcd/main/scoped_lock.cpp → esp/cpp/components/lcd/lcd.c
View File

@ -5,8 +5,9 @@
## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com ## ## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com ##
############################################################################## ##############################################################################
*/ */
#include "scoped_lock.h"
#include "include/lcd.h"
// LVGL library is not thread-safe, this example calls LVGL APIs from tasks. // LVGL library is not thread-safe, this example calls LVGL APIs from tasks.
// We must use a mutex to protect it. // We must use a mutex to protect it.
_lock_t ScopedLock::lv_lock_; static _lock_t lv_lock_;

171
esp/cpp/components/lcd/panel_device.cpp Normal file
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@ -0,0 +1,171 @@
/*#############################################################################
## Author: Shaun Reed ##
## Legal: All Content (c) 2025 Shaun Reed, all rights reserved ##
## ##
## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com ##
##############################################################################
*/
#include "include/panel_device.h"
#include <esp_timer.h>
#include <lcd.h>
#include <sys/unistd.h>
static bool lvgl_flush_ready_cb(esp_lcd_panel_io_handle_t,
esp_lcd_panel_io_event_data_t*, void* user_ctx)
{
auto* disp = (lv_display_t*)user_ctx;
lv_display_flush_ready(disp);
return false;
}
static void lvgl_flush_cb(lv_display_t* display, const lv_area_t* area,
uint8_t* px_map) // NOLINT(*-non-const-parameter)
{
auto panel_handle =
(esp_lcd_panel_handle_t)lv_display_get_user_data(display);
// Necessary because LVGL reserves 2x4 bytes in the buffer for a palette.
// Since we are monochrome, we don't need these additional bytes.
// For more information about the monochrome, please refer to:
// https://docs.lvgl.io/9.2/porting/display.html#monochrome-displays
// Skip the palette here.
px_map += LVGL_PALETTE_SIZE;
uint16_t hor_res = lv_display_get_physical_horizontal_resolution(display);
int32_t x1 = area->x1;
int32_t x2 = area->x2;
int32_t y1 = area->y1;
int32_t y2 = area->y2;
// As of 03/01/2025 master branch of LVGL contains this helper for the same.
// https://docs.lvgl.io/master/API/draw/sw/lv_draw_sw_utils.html
// lv_draw_sw_i1_convert_to_vtiled()
for (int32_t y = y1; y <= y2; y++)
{
for (int32_t x = x1; x <= x2; x++)
{
// Get the byte offset of the pixel coordinates using
// horizontal-mapping.
int h_offset = horizontal_byte_offset_long(x, y, hor_res);
// True if the pixel is lit, else false.
bool chroma_color = px_map[h_offset] & msb_mask(x);
// We need an additional buffer for transposing the pixel data to
// the vertical format required by the display driver.
uint8_t* buf = get_additional_draw_buffer();
// Move to the position in the auxillary buffer where the pixel is
// stored.
buf += vertical_byte_offset_long(x, y, hor_res);
// Write the single bit to the monochrome display mapped vertically.
// Take the Least Significant Bit mask of the Y coordinate to select
// the bit representing a pixel at position y in a vertically-mapped
// display.
if (chroma_color)
{
// Set the vertically-mapped pixel to on.
*buf &= ~lsb_mask(y);
}
else
{
// Set the vertically-mapped pixel to off.
*buf |= lsb_mask(y);
}
}
}
// Pass the draw buffer to the driver.
ESP_ERROR_CHECK(esp_lcd_panel_draw_bitmap(
panel_handle, x1, y1, x2 + 1, y2 + 1, get_additional_draw_buffer()));
}
static void lvgl_increase_tick_cb(void*)
{
// Tell LVGL how many milliseconds has elapsed
lv_tick_inc(LVGL_TICK_PERIOD_MS);
}
[[noreturn]] static void lvgl_port_task(void*)
{
// Optionally initialize some LVGL objects here before entering loop below.
ESP_LOGI(LCD_TAG, "Starting LVGL task");
for (uint32_t time_to_next_ms = 0; true; usleep(1000 * time_to_next_ms))
{
// Obtain LVGL API lock before calling any LVGL methods.
_lock_acquire(&lv_lock_);
// Optionally handle LVGL input or event logic here.
// Update LVGL periodic timers.
time_to_next_ms = lv_timer_handler();
_lock_release(&lv_lock_);
}
}
void register_rendering_data(lv_display_t* display_handle,
esp_lcd_panel_io_handle_t io_handle, void* lv_buf,
size_t lv_buf_size)
{
// Create draw buffer.
ESP_LOGI(LCD_TAG, "Allocate separate LVGL draw buffers");
lv_buf =
heap_caps_calloc(1, lv_buf_size, MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT);
assert(lv_buf);
ESP_LOGI(LCD_TAG, "Set LVGL draw buffers");
// Color format must be set first, LVGL9 support new monochromatic format.
lv_display_set_color_format(display_handle, LV_COLOR_FORMAT_I1);
lv_display_set_buffers(display_handle, lv_buf, nullptr, lv_buf_size,
LV_DISPLAY_RENDER_MODE_FULL);
lv_display_set_rotation(display_handle, LV_DISPLAY_ROTATION_0);
ESP_LOGI(LCD_TAG, "Set LVGL callback for flushing to the display");
lv_display_set_flush_cb(display_handle, lvgl_flush_cb);
ESP_LOGI(LCD_TAG,
"Register io panel callback for LVGL flush ready notification");
const esp_lcd_panel_io_callbacks_t cbs = {
.on_color_trans_done = lvgl_flush_ready_cb,
};
ESP_ERROR_CHECK(esp_lcd_panel_io_register_event_callbacks(io_handle, &cbs,
display_handle));
}
/**
* Registers LVGL ticker timer callback for rendering this display.
*
* An implementation of the interface can optionally override this method to
* provide custom LVGL callbacks and tick configurations.
*/
void register_lvgl_tick_timer()
{
ESP_LOGI(LCD_TAG, "Use esp_timer to increase LVGL tick");
const esp_timer_create_args_t esp_timer_args = {
.callback = &lvgl_increase_tick_cb,
// Data to pass to the lvgl_port_task callback.
.arg = nullptr,
.name = "lvgl_tick",
};
/// Start periodic ESP timer handle.
esp_timer_handle_t esp_timer_;
ESP_LOGI(LCD_TAG, "Creating esp_timer with name: '%s'",
esp_timer_args.name);
ESP_ERROR_CHECK(esp_timer_create(&esp_timer_args, &esp_timer_));
ESP_ERROR_CHECK(
esp_timer_start_periodic(esp_timer_, LVGL_TICK_PERIOD_MS * 1000));
ESP_LOGI(LCD_TAG, "Starting esp_timer with name: '%s'",
esp_timer_args.name);
// LVGL requires a FreeRTOS task for running it's event loop.
// The lvgl_port_task callback can update the UI or handle input logic.
// For this basic example we don't do either of these things.
ESP_LOGI(LCD_TAG, "Create LVGL FreeRTOS task");
// Optionally set user data to pass to LVGL's FreeRTOS task callback here.
void* user_data = nullptr;
xTaskCreate(lvgl_port_task, "LVGL", LVGL_TASK_STACK_SIZE, user_data,
LVGL_TASK_PRIORITY, nullptr);
}

6
esp/cpp/components/ssd1306/CMakeLists.txt
View File

@ -1,2 +1,4 @@
idf_component_register(SRCS "ssd1306.c" idf_component_register(
INCLUDE_DIRS "include") SRCS "ssd1306.c"
INCLUDE_DIRS "include"
)

6
esp/cpp/components/ssd1306/idf_component.yml
View File

@ -3,3 +3,9 @@ description: ESP SSD1306 display helper component
url: https://git.shaunreed.com/shaunrd0/klips/tree/master/esp/cpp/components/ssd1306 url: https://git.shaunreed.com/shaunrd0/klips/tree/master/esp/cpp/components/ssd1306
dependencies: dependencies:
idf: ">=5.3" idf: ">=5.3"
lvgl/lvgl: 9.2.0
espressif/esp_lcd_sh1107: ==1.0.0
i2c:
path: ../../components/i2c
lcd:
path: ../../components/lcd

108
esp/cpp/components/ssd1306/include/ssd1306.h
View File

@ -5,10 +5,14 @@
## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com ## ## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com ##
############################################################################## ##############################################################################
*/ */
#ifndef SSD1306_H #ifndef SSD1306_H
#define SSD1306_H #define SSD1306_H
#include "panel_device.h"
#include <esp_lcd_panel_ssd1306.h> #include <esp_lcd_panel_ssd1306.h>
#include <lcd.h>
// According to specific display hardware. // According to specific display hardware.
// https://www.digikey.com/en/products/detail/winstar-display/WEA012864DWPP3N00003/20533255 // https://www.digikey.com/en/products/detail/winstar-display/WEA012864DWPP3N00003/20533255
@ -26,71 +30,77 @@
/** /**
* Example of implementing the IPanelDevice interface for SSD1306 LCD device. * Example of implementing the IPanelDevice interface for SSD1306 LCD device.
*/ */
struct SSD1306 { struct SSD1306
{
/// SSD1306 configuration structure. /// SSD1306 configuration structure.
esp_lcd_panel_ssd1306_config_t ssd1306_config_; esp_lcd_panel_ssd1306_config_t ssd1306_config_;
}; };
/// Initializes the ESP LCD panel handle for the SSD1306 device. /// Initializes the ESP LCD panel handle for the SSD1306 device.
void SSD1306_init_panel(esp_lcd_panel_dev_config_t &config, static void SSD1306_init_panel_cb(esp_lcd_panel_dev_config_t* config,
esp_lcd_panel_io_handle_t io, esp_lcd_panel_io_handle_t io,
esp_lcd_panel_handle_t &panel) override esp_lcd_panel_handle_t* panel)
{ {
ESP_ERROR_CHECK(esp_lcd_new_panel_ssd1306(io, &config, &panel)); ESP_LOGI(LCD_TAG, "Initializing SSD1306 panel");
ESP_ERROR_CHECK(esp_lcd_new_panel_ssd1306(io, config, panel));
} }
/** static esp_lcd_panel_ssd1306_config_t SSD1306_config = {
* Construct a new SSD1306 device. .height = SCREEN_HEIGHT,
* };
* @param i2c I2C master bus to manage this device.
*/
void SSD1306_init(i2c_master_bus_handle_t &i2c) {
SSD1306_config_init(i2c, {.height = SCREEN_HEIGHT}, SCREEN_WIDTH, SCREEN_HEIGHT)
}
/**
* Construct a new SSD1306 device given a specific SSD1306 configuration.
*
* @param i2c I2C master bus to manage this device.
* @param vendor_config SSD1306 vendor configuration.
* @param width Width of the device screen in pixels.
* @param height Height of the device screen in pixels.
*/
SSD1306_config_init(//TODO: panel_device_t* device,
i2c_master_bus_handle_t &i2c,
esp_lcd_panel_ssd1306_config_t vendor_config,
int width,
int height
) {
/* TODO:
device->init_panel(
i2c,
vendor_config,
(esp_lcd_panel_io_i2c_config_t) {
.dev_addr = I2C_HW_ADDR,
// User data to pass to the LVGL flush_ready callback.
// See IPanelDevice::lvgl_flush_ready_cb
.user_ctx = nullptr,
.control_phase_bytes = 1,
.dc_bit_offset = 6,
.lcd_cmd_bits = LCD_CMD_BITS,
.lcd_param_bits = LCD_PARAM_BITS,
.scl_speed_hz = LCD_PIXEL_CLOCK_HZ,
},
width,
height
)
*/
}
/** /**
* Provides the SSD1306 vendor configuration to IPanelDevice consumers. * Provides the SSD1306 vendor configuration to IPanelDevice consumers.
* *
* @return Address of the SSD1306 vendor configuration structure. * @return Address of the SSD1306 vendor configuration structure.
*/ */
void *SSD1306_vendor_config() override static void* SSD1306_vendor_config_cb()
{ {
return &ssd1306_config_; ESP_LOGI(LCD_TAG, "Fetching global SSD1306 config");
return &SSD1306_config;
}
/**
* Construct a new SSD1306 device given a specific SSD1306 configuration.
*
* @param vendor_config SSD1306 vendor configuration.
* @param width Width of the device screen in pixels.
* @param height Height of the device screen in pixels.
*/
static struct IPanelDevice
SSD1306_config_new(esp_lcd_panel_ssd1306_config_t vendor_config, int width,
int height)
{
// TODO: Make it not global; There could be multiple SSD1306 displays.
ESP_LOGI(LCD_TAG, "Setting global SSD1306 configuration");
SSD1306_config = vendor_config;
// Must initialize device with LCD_new_panel to use default LVGL callbacks.
struct IPanelDevice device = LCD_new_panel();
device.width_ = width, device.height_ = height;
device.esp_io_config_ = (esp_lcd_panel_io_i2c_config_t){
.dev_addr = I2C_HW_ADDR,
// User data to pass to the LVGL flush_ready callback.
// See IPanelDevice::lvgl_flush_ready_cb
.user_ctx = NULL,
.control_phase_bytes = 1,
.dc_bit_offset = 6,
.lcd_cmd_bits = LCD_CMD_BITS,
.lcd_param_bits = LCD_PARAM_BITS,
.scl_speed_hz = LCD_PIXEL_CLOCK_HZ,
};
device.init_panel_cb = SSD1306_init_panel_cb;
device.vendor_config_cb = SSD1306_vendor_config_cb;
return device;
}
/**
* Construct a new SSD1306 device.
*/
static struct IPanelDevice SSD1306_new()
{
return SSD1306_config_new(
(esp_lcd_panel_ssd1306_config_t){.height = SCREEN_HEIGHT}, SCREEN_WIDTH,
SCREEN_HEIGHT);
} }
#endif // SSD1306_H #endif // SSD1306_H

9
esp/cpp/components/ssd1306/ssd1306.c
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@ -1,2 +1,9 @@
#include <stdio.h> /*#############################################################################
## Author: Shaun Reed ##
## Legal: All Content (c) 2025 Shaun Reed, all rights reserved ##
## ##
## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com ##
##############################################################################
*/
#include "ssd1306.h" #include "ssd1306.h"