161 lines
3.5 KiB
C
161 lines
3.5 KiB
C
#include "lcd_reg.h"
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#include "driver/gpio.h"
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#include "driver/spi_master.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/semphr.h"
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#include "freertos/task.h"
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#define LCD_SPI_HOST SPI2_HOST
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#define LCD_PIN_BL 1
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#define LCD_PIN_CS 8
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#define LCD_PIN_DC 9
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#define LCD_PIN_RES 10
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#define LCD_PIN_SDA 11
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#define LCD_PIN_SCL 12
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#define LCD_CMD_SWRESET 0x01
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#define LCD_CMD_SLPOUT 0x11
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#define LCD_CMD_COLMOD 0x3A
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#define LCD_CMD_MADCTL 0x36
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#define LCD_CMD_CASET 0x2A
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#define LCD_CMD_RASET 0x2B
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#define LCD_CMD_RAMWR 0x2C
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#define LCD_CMD_INVON 0x21
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#define LCD_CMD_DISPON 0x29
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static spi_device_handle_t lcd_spi;
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static SemaphoreHandle_t lcd_mutex;
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/* Timing */
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void lcd_delay_ms(uint32_t ms)
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{
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vTaskDelay(pdMS_TO_TICKS(ms));
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}
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/* Low-level bus and command helpers */
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static void lcd_spi_write(const void *data, uint32_t length)
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{
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spi_transaction_t transaction = {
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.length = length * 8,
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.tx_buffer = data,
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};
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spi_device_polling_transmit(lcd_spi, &transaction);
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}
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static void lcd_write(uint8_t dc_level, uint16_t value, uint8_t length)
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{
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uint8_t bytes[2] = {
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(uint8_t)(value >> 8),
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(uint8_t)value,
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};
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const uint8_t *data = length == 1 ? &bytes[1] : bytes;
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gpio_set_level(LCD_PIN_DC, dc_level);
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lcd_spi_write(data, length);
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}
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void lcd_set_window(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1)
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{
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lcd_write(0, LCD_CMD_CASET, 1);
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lcd_write(1, x0, 2);
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lcd_write(1, x1, 2);
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lcd_write(0, LCD_CMD_RASET, 1);
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lcd_write(1, y0, 2);
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lcd_write(1, y1, 2);
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lcd_write(0, LCD_CMD_RAMWR, 1);
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}
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void lcd_write_pixels(const void *data, uint32_t length)
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{
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gpio_set_level(LCD_PIN_DC, 1);
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lcd_spi_write(data, length);
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}
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/* Initialization */
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static void lcd_gpio_init(void)
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{
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gpio_config_t gpio_config_data = {
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.pin_bit_mask = (1ULL << LCD_PIN_BL) | (1ULL << LCD_PIN_DC) | (1ULL << LCD_PIN_RES),
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.mode = GPIO_MODE_OUTPUT,
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.pull_up_en = GPIO_PULLUP_DISABLE,
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.pull_down_en = GPIO_PULLDOWN_DISABLE,
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.intr_type = GPIO_INTR_DISABLE,
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};
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gpio_config(&gpio_config_data);
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gpio_set_level(LCD_PIN_BL, 1);
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gpio_set_level(LCD_PIN_DC, 0);
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gpio_set_level(LCD_PIN_RES, 1);
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}
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static void lcd_spi_init(void)
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{
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spi_bus_config_t bus_config = {
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.mosi_io_num = LCD_PIN_SDA,
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.miso_io_num = -1,
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.sclk_io_num = LCD_PIN_SCL,
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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 * 40 * 2,
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};
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spi_bus_initialize(LCD_SPI_HOST, &bus_config, SPI_DMA_CH_AUTO);
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spi_device_interface_config_t device_config = {
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.clock_speed_hz = 40000000,
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.mode = 0,
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.spics_io_num = LCD_PIN_CS,
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.queue_size = 8,
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};
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spi_bus_add_device(LCD_SPI_HOST, &device_config, &lcd_spi);
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}
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static void lcd_reset(void)
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{
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gpio_set_level(LCD_PIN_RES, 1);
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lcd_delay_ms(20);
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gpio_set_level(LCD_PIN_RES, 0);
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lcd_delay_ms(20);
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gpio_set_level(LCD_PIN_RES, 1);
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lcd_delay_ms(120);
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}
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static void lcd_controller_init(void)
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{
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lcd_write(0, LCD_CMD_SWRESET, 1);
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lcd_delay_ms(150);
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lcd_write(0, LCD_CMD_SLPOUT, 1);
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lcd_delay_ms(120);
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lcd_write(0, LCD_CMD_COLMOD, 1);
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lcd_write(1, 0x05, 1);
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lcd_write(0, LCD_CMD_MADCTL, 1);
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lcd_write(1, 0x60, 1);
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lcd_write(0, LCD_CMD_INVON, 1);
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lcd_write(0, LCD_CMD_DISPON, 1);
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lcd_delay_ms(120);
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}
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void lcd_reg_init(void)
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{
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lcd_mutex = xSemaphoreCreateMutex();
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lcd_gpio_init();
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lcd_spi_init();
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lcd_reset();
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lcd_controller_init();
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}
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