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