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klips/esp/cpp/07_lcd-panel/main/main.cpp
Shaun Reed e9d5ef46d1 Replace lcd project
2025-02-13 19:31:58 -05:00

238 lines
8.2 KiB
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/*
* SPDX-FileCopyrightText: 2021-2024 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: CC0-1.0
*/
#include <cstdio>
#include <unistd.h>
#include <sys/lock.h>
#include "main.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_timer.h"
#include "esp_lcd_panel_io.h"
#include "esp_lcd_panel_ops.h"
#include "esp_err.h"
#include "esp_log.h"
#include "driver/i2c_master.h"
#include "lvgl.h"
#include "esp_lcd_panel_vendor.h"
#define I2C_BUS_PORT 0
#define LVGL_TICK_PERIOD_MS 5
#define LVGL_TASK_STACK_SIZE (4 * 1024)
#define LVGL_TASK_PRIORITY 2
#define LVGL_PALETTE_SIZE 8
static const char *TAG = "lcd-panel";
// https://www.digikey.com/en/products/detail/winstar-display/WEA012864DWPP3N00003/20533255
// According to SSD1306 datasheet
// Bit number used to represent command and parameter
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#define LCD_H_RES SCREEN_WIDTH
#define LCD_V_RES SCREEN_HEIGHT
#define I2C_HW_ADDR 0x3C
#define LCD_PIXEL_CLOCK_HZ (400 * 1000)
#define LCD_CMD_BITS 8
#define LCD_PARAM_BITS 8
// Pin may vary based on your schematic
#define PIN_SDA GPIO_NUM_21
#define PIN_SCL GPIO_NUM_22
#define PIN_RST -1
// To use LV_COLOR_FORMAT_I1, we need an extra buffer to hold the converted data
static uint8_t oled_buffer[LCD_H_RES * LCD_V_RES / 8];
// LVGL library is not thread-safe, this example will call LVGL APIs from different tasks, so use a mutex to protect it
static _lock_t lvgl_api_lock;
static bool example_notify_lvgl_flush_ready(esp_lcd_panel_io_handle_t io_panel,
esp_lcd_panel_io_event_data_t *edata,
void *user_ctx)
{
auto *disp = (lv_display_t *) user_ctx;
lv_display_flush_ready(disp);
return false;
}
static void example_lvgl_flush_cb(lv_display_t *disp, const lv_area_t *area,
uint8_t *px_map)
{
auto panel_handle = (esp_lcd_panel_handle_t) lv_display_get_user_data(disp);
// This is necessary because LVGL reserves 2 x 4 bytes in the buffer, as these are assumed to be used as a palette. Skip the palette here
// More information about the monochrome, please refer to https://docs.lvgl.io/9.2/porting/display.html#monochrome-displays
px_map += LVGL_PALETTE_SIZE;
uint16_t hor_res = lv_display_get_physical_horizontal_resolution(disp);
int x1 = area->x1;
int x2 = area->x2;
int y1 = area->y1;
int y2 = area->y2;
for (int y = y1; y <= y2; y++) {
for (int x = x1; x <= x2; x++) {
/* The order of bits 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
*/
bool chroma_color = (px_map[(hor_res >> 3) * y + (x >> 3)] &
1 << (7 - x % 8));
/* Write to the buffer as required for the display.
* It writes only 1-bit for monochrome displays mapped vertically.*/
uint8_t *buf = oled_buffer + hor_res * (y >> 3) + (x);
if (chroma_color) {
(*buf) &= ~(1 << (y % 8));
} else {
(*buf) |= (1 << (y % 8));
}
}
}
// pass the draw buffer to the driver
ESP_ERROR_CHECK(
esp_lcd_panel_draw_bitmap(panel_handle, x1, y1, x2 + 1, y2 + 1,
oled_buffer));
}
static void example_increase_lvgl_tick(void *arg)
{
/* Tell LVGL how many milliseconds has elapsed */
lv_tick_inc(LVGL_TICK_PERIOD_MS);
}
static void example_lvgl_port_task(void *arg)
{
ESP_LOGI(TAG, "Starting LVGL task");
uint32_t time_till_next_ms = 0;
while (1) {
_lock_acquire(&lvgl_api_lock);
time_till_next_ms = lv_timer_handler();
_lock_release(&lvgl_api_lock);
usleep(1000 * time_till_next_ms);
}
}
void setup()
{
ESP_LOGI(TAG, "Initialize I2C bus");
i2c_master_bus_handle_t i2c_bus = nullptr;
i2c_master_bus_config_t bus_config = {
.i2c_port = I2C_BUS_PORT,
.sda_io_num = PIN_SDA,
.scl_io_num = PIN_SCL,
.clk_source = I2C_CLK_SRC_DEFAULT,
.glitch_ignore_cnt = 7,
.flags {
.enable_internal_pullup = true,
},
};
ESP_ERROR_CHECK(i2c_new_master_bus(&bus_config, &i2c_bus));
ESP_LOGI(TAG, "Install panel IO");
esp_lcd_panel_io_handle_t io_handle = nullptr;
esp_lcd_panel_io_i2c_config_t io_config = {
.dev_addr = I2C_HW_ADDR,
.control_phase_bytes = 1, // According to SSD1306 datasheet
.dc_bit_offset = 6, // According to SSD1306 datasheet
.lcd_cmd_bits = LCD_CMD_BITS, // According to SSD1306 datasheet
.lcd_param_bits = LCD_CMD_BITS, // According to SSD1306 datasheet
.scl_speed_hz = LCD_PIXEL_CLOCK_HZ,
};
ESP_ERROR_CHECK(esp_lcd_new_panel_io_i2c(i2c_bus, &io_config, &io_handle));
ESP_LOGI(TAG, "Install SSD1306 panel driver");
esp_lcd_panel_handle_t panel_handle = nullptr;
esp_lcd_panel_dev_config_t panel_config = {
.reset_gpio_num = PIN_RST,
.bits_per_pixel = 1,
};
esp_lcd_panel_ssd1306_config_t ssd1306_config = {
.height = LCD_V_RES,
};
panel_config.vendor_config = &ssd1306_config;
ESP_ERROR_CHECK(
esp_lcd_new_panel_ssd1306(io_handle, &panel_config, &panel_handle));
ESP_ERROR_CHECK(esp_lcd_panel_reset(panel_handle));
ESP_ERROR_CHECK(esp_lcd_panel_init(panel_handle));
ESP_ERROR_CHECK(esp_lcd_panel_disp_on_off(panel_handle, true));
ESP_LOGI(TAG, "Initialize LVGL");
lv_init();
// create a lvgl display
lv_display_t *display = lv_display_create(LCD_H_RES, LCD_V_RES);
// associate the i2c panel handle to the display
lv_display_set_user_data(display, panel_handle);
// create draw buffer
void *buf = nullptr;
ESP_LOGI(TAG, "Allocate separate LVGL draw buffers");
// LVGL reserves 2 x 4 bytes in the buffer, as these are assumed to be used as a palette.
size_t draw_buffer_sz = LCD_H_RES * LCD_V_RES / 8 + LVGL_PALETTE_SIZE;
buf = heap_caps_calloc(1, draw_buffer_sz,
MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT);
assert(buf);
// LVGL9 suooprt new monochromatic format.
lv_display_set_color_format(display, LV_COLOR_FORMAT_I1);
// initialize LVGL draw buffers
lv_display_set_buffers(display, buf, nullptr, draw_buffer_sz,
LV_DISPLAY_RENDER_MODE_FULL);
lv_display_set_rotation(display, LV_DISPLAY_ROTATION_90);
// set the callback which can copy the rendered image to an area of the display
lv_display_set_flush_cb(display, example_lvgl_flush_cb);
ESP_LOGI(TAG,
"Register io panel event callback for LVGL flush ready notification");
const esp_lcd_panel_io_callbacks_t cbs = {
.on_color_trans_done = example_notify_lvgl_flush_ready,
};
/* Register done callback */
ESP_ERROR_CHECK(
esp_lcd_panel_io_register_event_callbacks(io_handle, &cbs, display));
ESP_LOGI(TAG, "Use esp_timer as LVGL tick timer");
const esp_timer_create_args_t lvgl_tick_timer_args = {
.callback = &example_increase_lvgl_tick,
.name = "lvgl_tick"
};
esp_timer_handle_t lvgl_tick_timer = nullptr;
ESP_ERROR_CHECK(esp_timer_create(&lvgl_tick_timer_args, &lvgl_tick_timer));
ESP_ERROR_CHECK(esp_timer_start_periodic(lvgl_tick_timer,
LVGL_TICK_PERIOD_MS * 1000));
ESP_LOGI(TAG, "Create LVGL task");
xTaskCreate(example_lvgl_port_task, "LVGL", LVGL_TASK_STACK_SIZE,
nullptr, LVGL_TASK_PRIORITY, nullptr);
ESP_LOGI(TAG, "Display LVGL Scroll Text");
// Lock the mutex due to the LVGL APIs are not thread-safe
_lock_acquire(&lvgl_api_lock);
// UI function
{
lv_obj_t *scr = lv_display_get_screen_active(display);
lv_obj_t *label = lv_label_create(scr);
// Circular scroll
lv_label_set_long_mode(label,
LV_LABEL_LONG_WRAP);
lv_label_set_text(label,
"Hello hello hello hello hello hello hello hello.");
// Size of the screen
// if you use rotation 90 or 270 use lv_display_get_vertical_resolution
lv_obj_set_width(label, lv_display_get_horizontal_resolution(display));
lv_obj_align(label, LV_ALIGN_TOP_MID, 0, 0);
}
_lock_release(&lvgl_api_lock);
}
void loop() { }
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