339 lines
9.1 KiB
C
339 lines
9.1 KiB
C
/**
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* @file st7789.c
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* @brief ST7789 Display Driver Implementation - COMPLETE!
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*
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* Full implementation with:
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* - Complete initialization sequence
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* - Fast DMA transfers
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* - Framebuffer rendering
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* - Backlight PWM control
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*/
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#include <string.h>
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#include "esp_log.h"
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#include "driver/spi_master.h"
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#include "driver/gpio.h"
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#include "driver/ledc.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "st7789.h"
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#include "hardware_config.h"
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static const char *TAG = "ST7789";
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static spi_device_handle_t spi_handle = NULL;
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// ST7789 Commands
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#define ST7789_NOP 0x00
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#define ST7789_SWRESET 0x01
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#define ST7789_RDDID 0x04
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#define ST7789_RDDST 0x09
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#define ST7789_SLPIN 0x10
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#define ST7789_SLPOUT 0x11
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#define ST7789_PTLON 0x12
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#define ST7789_NORON 0x13
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#define ST7789_INVOFF 0x20
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#define ST7789_INVON 0x21
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#define ST7789_DISPOFF 0x28
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#define ST7789_DISPON 0x29
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#define ST7789_CASET 0x2A
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#define ST7789_RASET 0x2B
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#define ST7789_RAMWR 0x2C
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#define ST7789_RAMRD 0x2E
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#define ST7789_PTLAR 0x30
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#define ST7789_COLMOD 0x3A
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#define ST7789_MADCTL 0x36
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// MADCTL bits
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#define MADCTL_MY 0x80
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#define MADCTL_MX 0x40
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#define MADCTL_MV 0x20
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#define MADCTL_ML 0x10
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#define MADCTL_RGB 0x00
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#define MADCTL_BGR 0x08
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#define MADCTL_MH 0x04
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/**
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* @brief Send command to ST7789
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*/
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static void st7789_send_cmd(uint8_t cmd)
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{
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gpio_set_level(LCD_PIN_DC, 0); // Command mode
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spi_transaction_t t = {
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.length = 8,
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.tx_buffer = &cmd,
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.flags = SPI_TRANS_USE_TXDATA
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};
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t.tx_data[0] = cmd;
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ESP_ERROR_CHECK(spi_device_polling_transmit(spi_handle, &t));
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}
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/**
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* @brief Send data byte to ST7789
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*/
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static void st7789_send_data(uint8_t data)
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{
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gpio_set_level(LCD_PIN_DC, 1); // Data mode
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spi_transaction_t t = {
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.length = 8,
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.tx_buffer = &data,
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.flags = SPI_TRANS_USE_TXDATA
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};
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t.tx_data[0] = data;
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ESP_ERROR_CHECK(spi_device_polling_transmit(spi_handle, &t));
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}
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/**
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* @brief Send data buffer to ST7789
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*/
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static void st7789_send_data_buf(const uint8_t *data, size_t len)
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{
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if (len == 0) return;
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gpio_set_level(LCD_PIN_DC, 1); // Data mode
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spi_transaction_t t = {
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.length = len * 8,
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.tx_buffer = data
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};
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ESP_ERROR_CHECK(spi_device_polling_transmit(spi_handle, &t));
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}
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/**
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* @brief Set address window for drawing
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*/
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static void st7789_set_address_window(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1)
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{
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// Column address set
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st7789_send_cmd(ST7789_CASET);
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st7789_send_data(x0 >> 8);
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st7789_send_data(x0 & 0xFF);
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st7789_send_data(x1 >> 8);
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st7789_send_data(x1 & 0xFF);
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// Row address set
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st7789_send_cmd(ST7789_RASET);
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st7789_send_data(y0 >> 8);
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st7789_send_data(y0 & 0xFF);
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st7789_send_data(y1 >> 8);
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st7789_send_data(y1 & 0xFF);
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// Write to RAM
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st7789_send_cmd(ST7789_RAMWR);
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}
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/**
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* @brief Initialize backlight PWM
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*/
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static void st7789_backlight_init(void)
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{
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ledc_timer_config_t timer_conf = {
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.speed_mode = LEDC_LOW_SPEED_MODE,
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.timer_num = LEDC_TIMER_0,
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.duty_resolution = LEDC_TIMER_8_BIT,
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.freq_hz = 5000,
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.clk_cfg = LEDC_AUTO_CLK
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};
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ESP_ERROR_CHECK(ledc_timer_config(&timer_conf));
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ledc_channel_config_t channel_conf = {
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.gpio_num = LCD_PIN_BCKL,
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.speed_mode = LEDC_LOW_SPEED_MODE,
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.channel = LEDC_CHANNEL_0,
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.timer_sel = LEDC_TIMER_0,
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.duty = 0,
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.hpoint = 0
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};
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ESP_ERROR_CHECK(ledc_channel_config(&channel_conf));
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}
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esp_err_t st7789_init(void)
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{
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ESP_LOGI(TAG, "Initializing ST7789 display...");
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// Configure GPIO pins
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gpio_config_t io_conf = {};
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io_conf.pin_bit_mask = (1ULL << LCD_PIN_DC) | (1ULL << LCD_PIN_RST);
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io_conf.mode = GPIO_MODE_OUTPUT;
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io_conf.pull_up_en = GPIO_PULLUP_DISABLE;
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io_conf.pull_down_en = GPIO_PULLDOWN_DISABLE;
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gpio_config(&io_conf);
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// Configure SPI bus
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spi_bus_config_t buscfg = {
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.mosi_io_num = LCD_PIN_MOSI,
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.miso_io_num = LCD_PIN_MISO,
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.sclk_io_num = LCD_PIN_SCLK,
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.quadwp_io_num = -1,
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.quadhd_io_num = -1,
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.max_transfer_sz = LCD_WIDTH * LCD_HEIGHT * 2 + 8,
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};
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ESP_ERROR_CHECK(spi_bus_initialize(LCD_SPI_HOST, &buscfg, SPI_DMA_CH_AUTO));
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// Configure SPI device
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spi_device_interface_config_t devcfg = {
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.clock_speed_hz = LCD_PIXEL_CLOCK_HZ,
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.mode = 0,
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.spics_io_num = LCD_PIN_CS,
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.queue_size = 7,
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.flags = SPI_DEVICE_NO_DUMMY,
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};
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ESP_ERROR_CHECK(spi_bus_add_device(LCD_SPI_HOST, &devcfg, &spi_handle));
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// Initialize backlight
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st7789_backlight_init();
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st7789_set_backlight(0); // Start with backlight off
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// Hardware reset
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gpio_set_level(LCD_PIN_RST, 0);
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vTaskDelay(pdMS_TO_TICKS(100));
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gpio_set_level(LCD_PIN_RST, 1);
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vTaskDelay(pdMS_TO_TICKS(100));
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// ============================================
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// ST7789 Initialization Sequence
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// ============================================
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// Software reset
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st7789_send_cmd(ST7789_SWRESET);
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vTaskDelay(pdMS_TO_TICKS(150));
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// Out of sleep mode
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st7789_send_cmd(ST7789_SLPOUT);
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vTaskDelay(pdMS_TO_TICKS(10));
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// Color mode: 16-bit/pixel (RGB565)
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st7789_send_cmd(ST7789_COLMOD);
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st7789_send_data(0x55); // 16-bit
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vTaskDelay(pdMS_TO_TICKS(10));
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// Memory access control (rotation, RGB/BGR)
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st7789_send_cmd(ST7789_MADCTL);
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#if LCD_ROTATION == 0
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st7789_send_data(MADCTL_MX | MADCTL_MY | MADCTL_RGB);
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#elif LCD_ROTATION == 1
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st7789_send_data(MADCTL_MY | MADCTL_MV | MADCTL_RGB);
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#elif LCD_ROTATION == 2
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st7789_send_data(MADCTL_RGB);
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#elif LCD_ROTATION == 3
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st7789_send_data(MADCTL_MX | MADCTL_MV | MADCTL_RGB);
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#endif
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// Inversion mode on
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st7789_send_cmd(ST7789_INVON);
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vTaskDelay(pdMS_TO_TICKS(10));
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// Normal display mode on
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st7789_send_cmd(ST7789_NORON);
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vTaskDelay(pdMS_TO_TICKS(10));
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// Display on
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st7789_send_cmd(ST7789_DISPON);
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vTaskDelay(pdMS_TO_TICKS(100));
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ESP_LOGI(TAG, "✓ ST7789 initialized (%dx%d)", LCD_WIDTH, LCD_HEIGHT);
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// Set default backlight
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st7789_set_backlight(LCD_BCKL_DEFAULT);
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// Clear screen to black
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st7789_fill_screen(0x0000);
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return ESP_OK;
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}
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void st7789_set_backlight(uint8_t brightness)
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{
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if (brightness > 100) brightness = 100;
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uint32_t duty = (brightness * 255) / 100;
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ledc_set_duty(LEDC_LOW_SPEED_MODE, LEDC_CHANNEL_0, duty);
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ledc_update_duty(LEDC_LOW_SPEED_MODE, LEDC_CHANNEL_0);
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}
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void st7789_fill_screen(uint16_t color)
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{
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ESP_LOGD(TAG, "Filling screen with color 0x%04X", color);
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// Set full screen window
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st7789_set_address_window(0, 0, LCD_WIDTH - 1, LCD_HEIGHT - 1);
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// Prepare color buffer (1 line)
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uint16_t line_buf[LCD_WIDTH];
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for (int i = 0; i < LCD_WIDTH; i++) {
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// Convert to big-endian for ST7789
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line_buf[i] = (color >> 8) | (color << 8);
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}
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// Send line by line
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gpio_set_level(LCD_PIN_DC, 1); // Data mode
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for (int y = 0; y < LCD_HEIGHT; y++) {
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spi_transaction_t t = {
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.length = LCD_WIDTH * 16,
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.tx_buffer = line_buf
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};
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ESP_ERROR_CHECK(spi_device_polling_transmit(spi_handle, &t));
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}
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}
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void st7789_draw_pixel(int16_t x, int16_t y, uint16_t color)
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{
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if (x < 0 || x >= LCD_WIDTH || y < 0 || y >= LCD_HEIGHT) {
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return; // Out of bounds
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}
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st7789_set_address_window(x, y, x, y);
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// Convert to big-endian
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uint8_t data[2] = {color >> 8, color & 0xFF};
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gpio_set_level(LCD_PIN_DC, 1); // Data mode
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spi_transaction_t t = {
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.length = 16,
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.tx_buffer = data
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};
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ESP_ERROR_CHECK(spi_device_polling_transmit(spi_handle, &t));
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}
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void st7789_draw_buffer(const uint16_t *buffer, int16_t x, int16_t y,
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int16_t width, int16_t height)
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{
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if (buffer == NULL || width <= 0 || height <= 0) {
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return;
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}
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// Bounds checking
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if (x < 0 || y < 0 || x + width > LCD_WIDTH || y + height > LCD_HEIGHT) {
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ESP_LOGW(TAG, "Buffer out of bounds: (%d,%d) %dx%d", x, y, width, height);
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return;
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}
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ESP_LOGD(TAG, "Drawing buffer at (%d,%d) size %dx%d", x, y, width, height);
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// Set drawing window
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st7789_set_address_window(x, y, x + width - 1, y + height - 1);
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// Prepare buffer with byte-swapped colors (ST7789 is big-endian)
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size_t buf_size = width * height;
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uint16_t *swap_buf = heap_caps_malloc(buf_size * 2, MALLOC_CAP_DMA);
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if (swap_buf == NULL) {
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ESP_LOGE(TAG, "Failed to allocate swap buffer!");
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return;
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}
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// Swap bytes for ST7789
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for (size_t i = 0; i < buf_size; i++) {
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swap_buf[i] = (buffer[i] >> 8) | (buffer[i] << 8);
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}
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// Send via DMA
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gpio_set_level(LCD_PIN_DC, 1); // Data mode
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spi_transaction_t t = {
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.length = buf_size * 16,
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.tx_buffer = swap_buf
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};
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ESP_ERROR_CHECK(spi_device_polling_transmit(spi_handle, &t));
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heap_caps_free(swap_buf);
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}
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