lvgl_esp32_drivers/lvgl_tft/st7796s.c
Rop Gonggrijp 7b571a7fc7 LV_DISP_USE_RST
Allows to not allocate a GPIO for display reset: some may have that pin tied or attached to a Power management IC.

Supersedes PR from @usedbytes doing same but only for IL9341, this is for all supported displays.
2021-04-28 11:04:53 +02:00

249 lines
6 KiB
C

/**
* @file st7796s.c
*
*/
/*********************
* INCLUDES
*********************/
#include "st7796s.h"
#include "disp_spi.h"
#include "driver/gpio.h"
#include "esp_log.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
/*********************
* DEFINES
*********************/
#define TAG "ST7796S"
/**********************
* 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 st7796s_set_orientation(uint8_t orientation);
static void st7796s_send_cmd(uint8_t cmd);
static void st7796s_send_data(void *data, uint16_t length);
static void st7796s_send_color(void *data, uint16_t length);
/**********************
* STATIC VARIABLES
**********************/
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
void st7796s_init(void)
{
lcd_init_cmd_t init_cmds[] = {
{0xCF, {0x00, 0x83, 0X30}, 3},
{0xED, {0x64, 0x03, 0X12, 0X81}, 4},
{0xE8, {0x85, 0x01, 0x79}, 3},
{0xCB, {0x39, 0x2C, 0x00, 0x34, 0x02}, 5},
{0xF7, {0x20}, 1},
{0xEA, {0x00, 0x00}, 2},
{0xC0, {0x26}, 1}, /*Power control*/
{0xC1, {0x11}, 1}, /*Power control */
{0xC5, {0x35, 0x3E}, 2}, /*VCOM control*/
{0xC7, {0xBE}, 1}, /*VCOM control*/
{0x36, {0x28}, 1}, /*Memory Access Control*/
{0x3A, {0x55}, 1}, /*Pixel Format Set*/
{0xB1, {0x00, 0x1B}, 2},
{0xF2, {0x08}, 1},
{0x26, {0x01}, 1},
{0xE0, {0x1F, 0x1A, 0x18, 0x0A, 0x0F, 0x06, 0x45, 0X87, 0x32, 0x0A, 0x07, 0x02, 0x07, 0x05, 0x00}, 15},
{0XE1, {0x00, 0x25, 0x27, 0x05, 0x10, 0x09, 0x3A, 0x78, 0x4D, 0x05, 0x18, 0x0D, 0x38, 0x3A, 0x1F}, 15},
{0x2A, {0x00, 0x00, 0x00, 0xEF}, 4},
{0x2B, {0x00, 0x00, 0x01, 0x3f}, 4},
{0x2C, {0}, 0},
{0xB7, {0x07}, 1},
{0xB6, {0x0A, 0x82, 0x27, 0x00}, 4},
{0x11, {0}, 0x80},
{0x29, {0}, 0x80},
{0, {0}, 0xff},
};
#if ST7796S_BCKL == 15
gpio_config_t io_conf;
io_conf.intr_type = GPIO_PIN_INTR_DISABLE;
io_conf.mode = GPIO_MODE_OUTPUT;
io_conf.pin_bit_mask = GPIO_SEL_15;
io_conf.pull_down_en = GPIO_PULLDOWN_DISABLE;
io_conf.pull_up_en = GPIO_PULLUP_DISABLE;
gpio_config(&io_conf);
#endif
//Initialize non-SPI GPIOs
gpio_pad_select_gpio(ST7796S_DC);
gpio_set_direction(ST7796S_DC, GPIO_MODE_OUTPUT);
#if ST7796S_USE_RST
gpio_pad_select_gpio(ST7796S_RST);
gpio_set_direction(ST7796S_RST, GPIO_MODE_OUTPUT);
#endif
#if ST7796S_ENABLE_BACKLIGHT_CONTROL
gpio_pad_select_gpio(ST7796S_BCKL);
gpio_set_direction(ST7796S_BCKL, GPIO_MODE_OUTPUT);
#endif
#if ST7796S_USE_RST
//Reset the display
gpio_set_level(ST7796S_RST, 0);
vTaskDelay(100 / portTICK_RATE_MS);
gpio_set_level(ST7796S_RST, 1);
vTaskDelay(100 / portTICK_RATE_MS);
#endif
ESP_LOGI(TAG, "Initialization.");
//Send all the commands
uint16_t cmd = 0;
while (init_cmds[cmd].databytes != 0xff)
{
st7796s_send_cmd(init_cmds[cmd].cmd);
st7796s_send_data(init_cmds[cmd].data, init_cmds[cmd].databytes & 0x1F);
if (init_cmds[cmd].databytes & 0x80)
{
vTaskDelay(100 / portTICK_RATE_MS);
}
cmd++;
}
st7796s_enable_backlight(true);
st7796s_set_orientation(CONFIG_LV_DISPLAY_ORIENTATION);
#if ST7796S_INVERT_COLORS == 1
st7796s_send_cmd(0x21);
#else
st7796s_send_cmd(0x20);
#endif
}
void st7796s_flush(lv_disp_drv_t *drv, const lv_area_t *area, lv_color_t *color_map)
{
uint8_t data[4];
/*Column addresses*/
st7796s_send_cmd(0x2A);
data[0] = (area->x1 >> 8) & 0xFF;
data[1] = area->x1 & 0xFF;
data[2] = (area->x2 >> 8) & 0xFF;
data[3] = area->x2 & 0xFF;
st7796s_send_data(data, 4);
/*Page addresses*/
st7796s_send_cmd(0x2B);
data[0] = (area->y1 >> 8) & 0xFF;
data[1] = area->y1 & 0xFF;
data[2] = (area->y2 >> 8) & 0xFF;
data[3] = area->y2 & 0xFF;
st7796s_send_data(data, 4);
/*Memory write*/
st7796s_send_cmd(0x2C);
uint32_t size = lv_area_get_width(area) * lv_area_get_height(area);
st7796s_send_color((void *)color_map, size * 2);
}
void st7796s_enable_backlight(bool backlight)
{
#if ST7796S_ENABLE_BACKLIGHT_CONTROL
ESP_LOGI(TAG, "%s backlight.", backlight ? "Enabling" : "Disabling");
uint32_t tmp = 0;
#if (ST7796S_BCKL_ACTIVE_LVL == 1)
tmp = backlight ? 1 : 0;
#else
tmp = backlight ? 0 : 1;
#endif
gpio_set_level(ST7796S_BCKL, tmp);
#endif
}
void st7796s_sleep_in()
{
uint8_t data[] = {0x08};
st7796s_send_cmd(0x10);
st7796s_send_data(&data, 1);
}
void st7796s_sleep_out()
{
uint8_t data[] = {0x08};
st7796s_send_cmd(0x11);
st7796s_send_data(&data, 1);
}
/**********************
* STATIC FUNCTIONS
**********************/
static void st7796s_send_cmd(uint8_t cmd)
{
disp_wait_for_pending_transactions();
gpio_set_level(ST7796S_DC, 0); /*Command mode*/
disp_spi_send_data(&cmd, 1);
}
static void st7796s_send_data(void *data, uint16_t length)
{
disp_wait_for_pending_transactions();
gpio_set_level(ST7796S_DC, 1); /*Data mode*/
disp_spi_send_data(data, length);
}
static void st7796s_send_color(void *data, uint16_t length)
{
disp_wait_for_pending_transactions();
gpio_set_level(ST7796S_DC, 1); /*Data mode*/
disp_spi_send_colors(data, length);
}
static void st7796s_set_orientation(uint8_t orientation)
{
// ESP_ASSERT(orientation < 4);
const char *orientation_str[] = {
"PORTRAIT", "PORTRAIT_INVERTED", "LANDSCAPE", "LANDSCAPE_INVERTED"};
ESP_LOGI(TAG, "Display orientation: %s", orientation_str[orientation]);
#if defined CONFIG_LV_PREDEFINED_DISPLAY_M5STACK
uint8_t data[] = {0x68, 0x68, 0x08, 0x08};
#elif defined(CONFIG_LV_PREDEFINED_DISPLAY_WROVER4)
uint8_t data[] = {0x4C, 0x88, 0x28, 0xE8};
#elif defined(CONFIG_LV_PREDEFINED_DISPLAY_WT32_SC01)
uint8_t data[] = {0x48, 0x88, 0x28, 0xE8};
#elif defined(CONFIG_LV_PREDEFINED_DISPLAY_NONE)
uint8_t data[] = {0x48, 0x88, 0x28, 0xE8};
#endif
ESP_LOGI(TAG, "0x36 command value: 0x%02X", data[orientation]);
st7796s_send_cmd(0x36);
st7796s_send_data((void *)&data[orientation], 1);
}