API tools faq
paste
Guest User

Untitled

a guest
Sep 24th, 2025
30
0
Never
Add comment
Not a member of Pastebin yet? Sign Up, it unlocks many cool features!
C++ 7.57 KB | Source Code | 0 0
raw download clone embed print report
  1. #include <stdio.h>
  2.  
  3. #define ST7789_CLK 21
  4. #define ST7789_DATA 22
  5. #define ST7789_RST 27  // active low
  6. #define ST7789_CS 26   // active low
  7. #define ST7789_DC 25   // 1=data, 0=cmd
  8.  
  9. #define DATA_MODE gpio_set_level(ST7789_DC, 1);
  10. #define CMD_MODE gpio_set_level(ST7789_DC, 0);
  11.  
  12. // TFT LCD 76x284
  13. // 4-wire SPI with DCX
  14.  
  15. #include <driver/gpio.h>
  16. #include <spi_bus.h>
  17.  
  18. inline void wait(const uint16_t ms) { vTaskDelay(pdMS_TO_TICKS(ms)); }
  19.  
  20. void st7789_init(spi_bus_device_handle_t dev);
  21. void st7789_setAddrWindow(spi_bus_device_handle_t dev, uint16_t x, uint16_t y,
  22.                           uint16_t w, uint16_t h);
  23.  
  24. void app_main(void) {
  25.   gpio_reset_pin(ST7789_DC);
  26.   gpio_reset_pin(ST7789_RST);
  27.  
  28.   gpio_set_direction(ST7789_RST, GPIO_MODE_OUTPUT);
  29.   gpio_set_direction(ST7789_DC, GPIO_MODE_OUTPUT);
  30.  
  31.   // hw reset
  32.   gpio_set_level(ST7789_RST, 1);
  33.   wait(1);
  34.   gpio_set_level(ST7789_RST, 0);
  35.   wait(1);
  36.   gpio_set_level(ST7789_RST, 1);
  37.  
  38.   spi_bus_handle_t bus_hdl = {0};
  39.   spi_bus_device_handle_t dev = {0};
  40.  
  41.   spi_config_t bus_cfg = {.mosi_io_num = ST7789_DATA,
  42.                           .miso_io_num = -1,
  43.                           .sclk_io_num = ST7789_CLK,
  44.                           .max_transfer_sz = 1};
  45.  
  46.   spi_device_config_t st7789_cfg = {
  47.       .cs_io_num = ST7789_CS, .mode = 0, .clock_speed_hz = SPI_MASTER_FREQ_10M};
  48.  
  49.   bus_hdl = spi_bus_create(SPI3_HOST, &bus_cfg);
  50.   if (!bus_hdl) {
  51.     printf("SPI bus error: Cannot create SPI bus\n");
  52.     exit(-1);
  53.   }
  54.   dev = spi_bus_device_create(bus_hdl, &st7789_cfg);
  55.   if (!dev) {
  56.     printf("SPI bus error: Cannot create SPI device\n");
  57.     exit(-1);
  58.   }
  59.  
  60.   // <---perform SPI here--->
  61.   st7789_init(dev);
  62.  
  63.   CMD_MODE
  64.   spi_bus_transfer_byte(dev, 0x2C, NULL);  // memory write
  65.   DATA_MODE
  66.   for (uint8_t i = 0; i < 25; i++) {
  67.     for (uint8_t j = 0; j < 25; j++) {
  68.       // fill 25x25 area with 0xAAAA
  69.       spi_bus_transfer_byte(dev, 0xAA, NULL);
  70.       spi_bus_transfer_byte(dev, 0xAA, NULL);
  71.     }
  72.   }
  73.   CMD_MODE
  74.   // <---endregion--->
  75.  
  76.   spi_bus_device_delete(&dev);
  77.   spi_bus_delete(&bus_hdl);
  78. }
  79.  
  80. void st7789_init(spi_bus_device_handle_t dev) {
  81.   spi_bus_transfer_byte(dev, 0x01, NULL);  // sw reset
  82.   wait(10);
  83.  
  84.   spi_bus_transfer_byte(dev, 0x26, NULL);  // set gamma
  85.   DATA_MODE
  86.   spi_bus_transfer_byte(dev, 0x01, NULL);  // gamma 2.2
  87.   CMD_MODE
  88.  
  89.   spi_bus_transfer_byte(dev, 0x36, NULL);  // memory data access control
  90.   DATA_MODE
  91.   spi_bus_transfer_byte(dev, 0x00, NULL);  // 000000_xxb - normal mode
  92.   CMD_MODE
  93.  
  94.   spi_bus_transfer_byte(dev, 0x3A, NULL);  // pixel format
  95.   DATA_MODE
  96.   spi_bus_transfer_byte(dev, 0x26, NULL);  // 0_101_0_101 - 65K@16bit
  97.   CMD_MODE
  98.  
  99.   spi_bus_transfer_byte(dev, 0xB0, NULL);  // RAM control
  100.   DATA_MODE
  101.   spi_bus_transfer_byte(dev, 0x00, NULL);  // RAM access from MCU
  102.   spi_bus_transfer_byte(dev, 0xCA, NULL);  // RAM LE+MSB
  103.   CMD_MODE
  104.  
  105.   spi_bus_transfer_byte(dev, 0xB2, NULL);  // porch settings
  106.   DATA_MODE
  107.   spi_bus_transfer_byte(dev, 0x0C, NULL);
  108.   spi_bus_transfer_byte(dev, 0x0C, NULL);
  109.   spi_bus_transfer_byte(dev, 0x00, NULL);
  110.   spi_bus_transfer_byte(dev, 0x33, NULL);
  111.   spi_bus_transfer_byte(dev, 0x33, NULL);
  112.   CMD_MODE
  113.  
  114.   spi_bus_transfer_byte(dev, 0xB7, NULL);  // gate control
  115.   DATA_MODE
  116.   spi_bus_transfer_byte(dev, 0x45, NULL);  // 13.65-10.43V
  117.   CMD_MODE
  118.  
  119.   spi_bus_transfer_byte(dev, 0x2B, NULL);  // VCOM
  120.   DATA_MODE
  121.   spi_bus_transfer_byte(dev, 0x2B, NULL);  // 1.175V
  122.   CMD_MODE
  123.  
  124.   spi_bus_transfer_byte(dev, 0xC0, NULL);  // LCM
  125.   DATA_MODE
  126.   spi_bus_transfer_byte(dev, 0x2C, NULL);  // XBGR, XMX, XMH
  127.   CMD_MODE
  128.  
  129.   spi_bus_transfer_byte(dev, 0xC2, NULL);  // VDV and VRH
  130.   DATA_MODE
  131.   spi_bus_transfer_byte(dev, 0x01, NULL);  // VDV and VRH from CMD wire
  132.   spi_bus_transfer_byte(dev, 0xFF, NULL);  // always FFh
  133.   CMD_MODE
  134.  
  135.   spi_bus_transfer_byte(dev, 0xC3, NULL);  // VRH
  136.   DATA_MODE
  137.   spi_bus_transfer_byte(dev, 0x11, NULL);  // 4.4+V
  138.   CMD_MODE
  139.  
  140.   spi_bus_transfer_byte(dev, 0xC4, NULL);  // VDV
  141.   DATA_MODE
  142.   spi_bus_transfer_byte(dev, 0x20, NULL);  // 0V
  143.   CMD_MODE
  144.  
  145.   spi_bus_transfer_byte(dev, 0xC6, NULL);  // framerate control
  146.   DATA_MODE
  147.   spi_bus_transfer_byte(dev, 0x0F, NULL);  // 60Hz
  148.   CMD_MODE
  149.  
  150.   spi_bus_transfer_byte(dev, 0xD0, NULL);  // power control
  151.   DATA_MODE
  152.   spi_bus_transfer_byte(dev, 0xA4, NULL);  // always A4h
  153.   spi_bus_transfer_byte(dev, 0xA1, NULL);  // 6.8V, -4.8V, 2.3V
  154.   CMD_MODE
  155.  
  156.   spi_bus_transfer_byte(dev, 0xE0, NULL);  // positive voltage gamma control
  157.   DATA_MODE
  158.   spi_bus_transfer_byte(dev, 0xD0, NULL);
  159.   spi_bus_transfer_byte(dev, 0x00, NULL);
  160.   spi_bus_transfer_byte(dev, 0x05, NULL);
  161.   spi_bus_transfer_byte(dev, 0x0E, NULL);
  162.   spi_bus_transfer_byte(dev, 0x15, NULL);
  163.   spi_bus_transfer_byte(dev, 0x0D, NULL);
  164.   spi_bus_transfer_byte(dev, 0x37, NULL);
  165.   spi_bus_transfer_byte(dev, 0x43, NULL);
  166.   spi_bus_transfer_byte(dev, 0x47, NULL);
  167.   spi_bus_transfer_byte(dev, 0x09, NULL);
  168.   spi_bus_transfer_byte(dev, 0x15, NULL);
  169.   spi_bus_transfer_byte(dev, 0x12, NULL);
  170.   spi_bus_transfer_byte(dev, 0x16, NULL);
  171.   spi_bus_transfer_byte(dev, 0x19, NULL);
  172.   CMD_MODE
  173.  
  174.   spi_bus_transfer_byte(dev, 0xE0, NULL);  // negative voltage gamma control
  175.   DATA_MODE
  176.   spi_bus_transfer_byte(dev, 0xD0, NULL);
  177.   spi_bus_transfer_byte(dev, 0x00, NULL);
  178.   spi_bus_transfer_byte(dev, 0x05, NULL);
  179.   spi_bus_transfer_byte(dev, 0x0D, NULL);
  180.   spi_bus_transfer_byte(dev, 0x0C, NULL);
  181.   spi_bus_transfer_byte(dev, 0x06, NULL);
  182.   spi_bus_transfer_byte(dev, 0x2D, NULL);
  183.   spi_bus_transfer_byte(dev, 0x44, NULL);
  184.   spi_bus_transfer_byte(dev, 0x40, NULL);
  185.   spi_bus_transfer_byte(dev, 0x0E, NULL);
  186.   spi_bus_transfer_byte(dev, 0x1C, NULL);
  187.   spi_bus_transfer_byte(dev, 0x18, NULL);
  188.   spi_bus_transfer_byte(dev, 0x16, NULL);
  189.   spi_bus_transfer_byte(dev, 0x19, NULL);
  190.   CMD_MODE
  191.  
  192.   spi_bus_transfer_byte(dev, 0x11, NULL);  // sleep out
  193.   wait(5);
  194.   spi_bus_transfer_byte(dev, 0x29, NULL);  // display on
  195.   spi_bus_transfer_byte(dev, 0x13, NULL);  // normal display on
  196.   spi_bus_transfer_byte(dev, 0x21, NULL);  // inv on
  197.  
  198.   /*spi_bus_transfer_byte(dev, 0x2A, NULL);  // column addr set
  199.   DATA_MODE
  200.   spi_bus_transfer_byte(dev, 0x00, NULL);  // XS[15:8]
  201.   spi_bus_transfer_byte(dev, 0x00, NULL);  // XS[7:0]
  202.   spi_bus_transfer_byte(dev, 0x00, NULL);  // XE[15:8]
  203.   spi_bus_transfer_byte(dev, 0x00, NULL);  // XE[7:0]
  204.   CMD_MODE
  205.  
  206.   spi_bus_transfer_byte(dev, 0x2B, NULL);  // row addr set
  207.   DATA_MODE
  208.   spi_bus_transfer_byte(dev, 0x00, NULL);  // YS[15:8]
  209.   spi_bus_transfer_byte(dev, 0x00, NULL);  // YS[7:0]
  210.   spi_bus_transfer_byte(dev, 0x00, NULL);  // YE[15:8]
  211.   spi_bus_transfer_byte(dev, 0x00, NULL);  // YE[7:0]
  212.   CMD_MODE*/
  213.   st7789_setAddrWindow(dev, 0, 0, 76, 284);
  214. }
  215.  
  216. void st7789_setAddrWindow(spi_bus_device_handle_t dev, uint16_t x, uint16_t y,
  217.                           uint16_t w, uint16_t h) {
  218.   const uint16_t xs = x;
  219.   const uint16_t xe = x + w;
  220.   const uint16_t ys = y;
  221.   const uint16_t ye = y + h;
  222.  
  223.   CMD_MODE
  224.   spi_bus_transfer_byte(dev, 0x2A, NULL);  // column addr set
  225.   DATA_MODE
  226.   spi_bus_transfer_byte(dev, xs >> 8, NULL);    // XS[15:8]
  227.   spi_bus_transfer_byte(dev, xs & 0xff, NULL);  // XS[7:0]
  228.   spi_bus_transfer_byte(dev, xe >> 8, NULL);    // XE[15:8]
  229.   spi_bus_transfer_byte(dev, xe & 0xff, NULL);  // XE[7:0]
  230.   CMD_MODE
  231.  
  232.   spi_bus_transfer_byte(dev, 0x2B, NULL);  // row addr set
  233.   DATA_MODE
  234.   spi_bus_transfer_byte(dev, ys >> 8, NULL);    // YS[15:8]
  235.   spi_bus_transfer_byte(dev, ys & 0xff, NULL);  // YS[7:0]
  236.   spi_bus_transfer_byte(dev, ye >> 8, NULL);    // Ye[15:8]
  237.   spi_bus_transfer_byte(dev, ye & 0xff, NULL);  // Ye[7:0]
  238.   CMD_MODE
  239. }
Tags: ESP32 esp-idf st7789
Advertisement
Add Comment
Please, Sign In to add comment
Public Pastes
We use cookies for various purposes including analytics. By continuing to use Pastebin, you agree to our use of cookies as described in the Cookies Policy.  OK, I Understand
Not a member of Pastebin yet?
Sign Up, it unlocks many cool features!