/** * @file st7789.c * * Mostly taken from lbthomsen/esp-idf-littlevgl github. */ #include "freertos/FreeRTOS.h" #include "freertos/task.h" #include "sdkconfig.h" #include "st7789.h" #include "disp_spi.h" #include "driver/gpio.h" /********************* * DEFINES *********************/ /********************** * TYPEDEFS **********************/ /*The LCD needs a bunch of command/argument values to be initialized. They are stored in this struct. */ typedef struct { uint8_t cmd; uint8_t data[16]; uint8_t databytes; //No of data in data; bit 7 = delay after set; 0xFF = end of cmds. } lcd_init_cmd_t; /********************** * STATIC PROTOTYPES **********************/ static void st7789_send_cmd(uint8_t cmd); static void st7789_send_data(void *data, uint16_t length); static void st7789_send_color(void *data, uint16_t length); /********************** * STATIC VARIABLES **********************/ /********************** * MACROS **********************/ /********************** * GLOBAL FUNCTIONS **********************/ void st7789_init(void) { lcd_init_cmd_t st7789_init_cmds[] = { {0xCF, {0x00, 0x83, 0X30}, 3}, {0xED, {0x64, 0x03, 0X12, 0X81}, 4}, {ST7789_PWCTRL2, {0x85, 0x01, 0x79}, 3}, {0xCB, {0x39, 0x2C, 0x00, 0x34, 0x02}, 5}, {0xF7, {0x20}, 1}, {0xEA, {0x00, 0x00}, 2}, {ST7789_LCMCTRL, {0x26}, 1}, {ST7789_IDSET, {0x11}, 1}, {ST7789_VCMOFSET, {0x35, 0x3E}, 2}, {ST7789_CABCCTRL, {0xBE}, 1}, {ST7789_MADCTL, {0x00}, 1}, // Set to 0x28 if your display is flipped {ST7789_COLMOD, {0x55}, 1}, {ST7789_INVON, {0}, 0}, {ST7789_RGBCTRL, {0x00, 0x1B}, 2}, {0xF2, {0x08}, 1}, {ST7789_GAMSET, {0x01}, 1}, {ST7789_PVGAMCTRL, {0xD0, 0x00, 0x02, 0x07, 0x0A, 0x28, 0x32, 0x44, 0x42, 0x06, 0x0E, 0x12, 0x14, 0x17}, 14}, {ST7789_NVGAMCTRL, {0xD0, 0x00, 0x02, 0x07, 0x0A, 0x28, 0x31, 0x54, 0x47, 0x0E, 0x1C, 0x17, 0x1B, 0x1E}, 14}, {ST7789_CASET, {0x00, 0x00, 0x00, 0xEF}, 4}, {ST7789_RASET, {0x00, 0x00, 0x01, 0x3f}, 4}, {ST7789_RAMWR, {0}, 0}, {ST7789_GCTRL, {0x07}, 1}, {0xB6, {0x0A, 0x82, 0x27, 0x00}, 4}, {ST7789_SLPOUT, {0}, 0x80}, {ST7789_DISPON, {0}, 0x80}, {0, {0}, 0xff}, }; //Initialize non-SPI GPIOs gpio_set_direction(ST7789_DC, GPIO_MODE_OUTPUT); gpio_set_direction(ST7789_RST, GPIO_MODE_OUTPUT); #if ST7789_ENABLE_BACKLIGHT_CONTROL gpio_set_direction(ST7789_BCKL, GPIO_MODE_OUTPUT); #endif //Reset the display gpio_set_level(ST7789_RST, 0); vTaskDelay(100 / portTICK_RATE_MS); gpio_set_level(ST7789_RST, 1); vTaskDelay(100 / portTICK_RATE_MS); printf("ST7789 initialization.\n"); //Send all the commands uint16_t cmd = 0; while (st7789_init_cmds[cmd].databytes!=0xff) { st7789_send_cmd(st7789_init_cmds[cmd].cmd); st7789_send_data(st7789_init_cmds[cmd].data, st7789_init_cmds[cmd].databytes&0x1F); if (st7789_init_cmds[cmd].databytes & 0x80) { vTaskDelay(100 / portTICK_RATE_MS); } cmd++; } st7789_enable_backlight(true); } void st7789_enable_backlight(bool backlight) { #if ST7789_ENABLE_BACKLIGHT_CONTROL printf("%s backlight.\n", backlight ? "Enabling" : "Disabling"); uint32_t tmp = 0; #if (ST7789_BCKL_ACTIVE_LVL==1) tmp = backlight ? 1 : 0; #else tmp = backlight ? 0 : 1; #endif gpio_set_level(ST7789_BCKL, tmp); #endif } void st7789_flush(lv_disp_drv_t * drv, const lv_area_t * area, lv_color_t * color_map) { uint8_t data[4] = {0}; /*Column addresses*/ st7789_send_cmd(ST7789_CASET); data[0] = (area->x1 >> 8) & 0xFF; data[1] = area->x1 & 0xFF; data[2] = (area->x2 >> 8) & 0xFF; data[3] = area->x2 & 0xFF; st7789_send_data(data, 4); /*Page addresses*/ st7789_send_cmd(ST7789_RASET); data[0] = (area->y1 >> 8) & 0xFF; data[1] = area->y1 & 0xFF; data[2] = (area->y2 >> 8) & 0xFF; data[3] = area->y2 & 0xFF; st7789_send_data(data, 4); /*Memory write*/ st7789_send_cmd(ST7789_RAMWR); uint32_t size = lv_area_get_width(area) * lv_area_get_height(area); st7789_send_color((void*)color_map, size * 2); } /********************** * STATIC FUNCTIONS **********************/ static void st7789_send_cmd(uint8_t cmd) { while (disp_spi_is_busy()) {} gpio_set_level(ST7789_DC, 0); disp_spi_send_data(&cmd, 1); } static void st7789_send_data(void * data, uint16_t length) { while (disp_spi_is_busy()) {} gpio_set_level(ST7789_DC, 1); disp_spi_send_data(data, length); } static void st7789_send_color(void * data, uint16_t length) { while (disp_spi_is_busy()) {} gpio_set_level(ST7789_DC, 1); disp_spi_send_colors(data, length); }