107 lines
3.5 KiB
C
107 lines
3.5 KiB
C
/*#############################################################################
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## Author: Shaun Reed ##
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## Legal: All Content (c) 2025 Shaun Reed, all rights reserved ##
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## ##
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## Contact: shaunrd0@gmail.com | URL: www.shaunreed.com ##
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##############################################################################
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*/
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#ifndef SSD1306_H
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#define SSD1306_H
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#include "panel_device.h"
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#include <esp_lcd_panel_ssd1306.h>
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#include <lcd.h>
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// According to specific display hardware.
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// https://www.digikey.com/en/products/detail/winstar-display/WEA012864DWPP3N00003/20533255
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#define SCREEN_WIDTH 128 // OLED display width, in pixels.
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#define SCREEN_HEIGHT 64 // OLED display height, in pixels.
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// According to SSD1306 datasheet.
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// https://cdn-shop.adafruit.com/datasheets/SSD1306.pdf
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#define I2C_HW_ADDR 0x3C
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#define LCD_PIXEL_CLOCK_HZ (400 * 1000)
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// Bit number used to represent command and parameter
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#define LCD_CMD_BITS 8
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#define LCD_PARAM_BITS 8
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/**
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* Example of implementing the IPanelDevice interface for SSD1306 LCD device.
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*/
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struct SSD1306
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{
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/// SSD1306 configuration structure.
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esp_lcd_panel_ssd1306_config_t ssd1306_config_;
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};
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/// Initializes the ESP LCD panel handle for the SSD1306 device.
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static void SSD1306_init_panel_cb(esp_lcd_panel_dev_config_t* config,
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esp_lcd_panel_io_handle_t io,
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esp_lcd_panel_handle_t* panel)
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{
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ESP_LOGI(LCD_TAG, "Initializing SSD1306 panel");
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ESP_ERROR_CHECK(esp_lcd_new_panel_ssd1306(io, config, panel));
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}
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static esp_lcd_panel_ssd1306_config_t SSD1306_config = {
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.height = SCREEN_HEIGHT,
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};
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/**
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* Provides the SSD1306 vendor configuration to IPanelDevice consumers.
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*
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* @return Address of the SSD1306 vendor configuration structure.
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*/
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static void* SSD1306_vendor_config_cb()
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{
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ESP_LOGI(LCD_TAG, "Fetching global SSD1306 config");
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return &SSD1306_config;
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}
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/**
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* Construct a new SSD1306 device given a specific SSD1306 configuration.
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*
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* @param vendor_config SSD1306 vendor configuration.
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* @param width Width of the device screen in pixels.
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* @param height Height of the device screen in pixels.
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*/
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static struct IPanelDevice
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SSD1306_config_new(esp_lcd_panel_ssd1306_config_t vendor_config, int width,
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int height)
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{
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// TODO: Make it not global; There could be multiple SSD1306 displays.
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ESP_LOGI(LCD_TAG, "Setting global SSD1306 configuration");
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SSD1306_config = vendor_config;
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// Must initialize device with LCD_new_panel to use default LVGL callbacks.
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struct IPanelDevice device = LCD_new_panel();
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device.width_ = width, device.height_ = height;
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device.esp_io_config_ = (esp_lcd_panel_io_i2c_config_t){
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.dev_addr = I2C_HW_ADDR,
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// User data to pass to the LVGL flush_ready callback.
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// See IPanelDevice::lvgl_flush_ready_cb
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.user_ctx = NULL,
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.control_phase_bytes = 1,
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.dc_bit_offset = 6,
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.lcd_cmd_bits = LCD_CMD_BITS,
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.lcd_param_bits = LCD_PARAM_BITS,
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.scl_speed_hz = LCD_PIXEL_CLOCK_HZ,
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};
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device.init_panel_cb = SSD1306_init_panel_cb;
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device.vendor_config_cb = SSD1306_vendor_config_cb;
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return device;
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}
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/**
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* Construct a new SSD1306 device.
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*/
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static struct IPanelDevice SSD1306_new()
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{
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return SSD1306_config_new(
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(esp_lcd_panel_ssd1306_config_t){.height = SCREEN_HEIGHT}, SCREEN_WIDTH,
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SCREEN_HEIGHT);
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}
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#endif // SSD1306_H
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