ESP32 Forum

Posted: **Mon Jun 10, 2024 1:15 pm**

Hello,
I have a ESP32-S3-R8N16 board with a TFT screen 170x320. When I use Adafruit_GFX library everything works fine but I want to use DMA on the screen to have more reactivity and I try to display many thing but come back to the beginning and now I just want to display red screen but I have this:

: IMG_20240610_151102_6.jpg (212.38 KiB) Viewed 947 times

I don't understand where is my error, can you help me please ? You can find my code here:

Code: Untitled.cpp Select all


#include <SPI.h>

#include "driver/spi_master.h"



#define TFT_CS 10

#define TFT_DC 11

#define TFT_MOSI 13

#define TFT_SCLK 12

#define TFT_RST 1

#define TFT_BL 14



#define WIDTH 170

#define HEIGHT 320



spi_device_handle_t spi;



void setup() {

  Serial.begin(115200);



  // Initialiser les broches

  pinMode(TFT_CS, OUTPUT);

  pinMode(TFT_DC, OUTPUT);

  pinMode(TFT_RST, OUTPUT);

  pinMode(TFT_BL, OUTPUT);

  digitalWrite(TFT_CS, HIGH);

  digitalWrite(TFT_BL, HIGH);



  // Configuration du SPI

  spi_bus_config_t buscfg = {

    .mosi_io_num = TFT_MOSI,

    .miso_io_num = -1,

    .sclk_io_num = TFT_SCLK,

    .quadwp_io_num = -1,

    .quadhd_io_num = -1,

    .max_transfer_sz = WIDTH * HEIGHT * 2

  };



  spi_device_interface_config_t devcfg = {

    .mode = 0,

    .clock_speed_hz = 20 * 1000 * 1000,

    .spics_io_num = TFT_CS,

    .queue_size = 7,

    .pre_cb = NULL,

    .post_cb = NULL,

  };



  esp_err_t ret = spi_bus_initialize(SPI3_HOST, &buscfg, SPI_DMA_CH_AUTO);

  if (ret != ESP_OK) {

    Serial.printf("Failed to initialize bus: %s\n", esp_err_to_name(ret));

    while (1)

      ;

  }



  ret = spi_bus_add_device(SPI3_HOST, &devcfg, &spi);

  if (ret != ESP_OK) {

    Serial.printf("Failed to add device: %s\n", esp_err_to_name(ret));

    while (1)

      ;

  }



  // Reset

  digitalWrite(TFT_RST, LOW);

  delay(100);

  digitalWrite(TFT_RST, HIGH);

  delay(100);



  // Init

  sendCommand(0x01);      // Software reset

  delay(150);

  sendCommand(0x11);      // Sleep out

  delay(500);

  sendCommand(0x36);      // Memory data access control

  sendData(0x00);

  sendCommand(0x3A);      // Interface pixel format

  sendData(0x55);         // 16-bit/pixel

  sendCommand(0x29);      // Display on

  sendCommand(0x13);      // Normal display

}



void sendCommand(uint8_t cmd) {

  digitalWrite(TFT_DC, LOW);

  digitalWrite(TFT_CS, LOW);

  spi_transaction_t t;

  memset(&t, 0, sizeof(t));

  t.length = 8;

  t.tx_buffer = &cmd;

  spi_device_transmit(spi, &t);

  digitalWrite(TFT_CS, HIGH);

}



void sendData(uint8_t data) {

  digitalWrite(TFT_DC, HIGH);

  digitalWrite(TFT_CS, LOW);

  spi_transaction_t t;

  memset(&t, 0, sizeof(t));

  t.length = 8;

  t.tx_buffer = &data;

  spi_device_transmit(spi, &t);

  digitalWrite(TFT_CS, HIGH);

}



void loop() {

  sendCommand(0x2A);  // Column address set

  sendData(0x00);

  sendData(0x23);     // Offset because there is 35px before and after ((240 - 170) / 2)

  sendData(0x00);

  sendData(0xCC);



  sendCommand(0x2B);  // Row address set

  sendData(0x00);

  sendData(0x00);

  sendData((HEIGHT - 1) >> 8);

  sendData((HEIGHT - 1) & 0xFF);



  sendCommand(0x2C);  // Memory write



  digitalWrite(TFT_CS, LOW);

  delay(100);

  digitalWrite(TFT_DC, HIGH);

  delay(100);



  uint16_t lineBuffer[WIDTH];

  for (int y = 0; y < HEIGHT; y++) {

    for (int x = 0; x < WIDTH; x++) {

      // RED in RGB565

      lineBuffer[x] = 0xF800;

    }

    sendLine(lineBuffer);

  }



  delay(500);

}



void sendLine(uint16_t* lineBuffer) {

  digitalWrite(TFT_DC, HIGH);

  digitalWrite(TFT_CS, LOW);



  spi_transaction_t t;

  memset(&t, 0, sizeof(t));

  t.length = WIDTH * 16;

  t.tx_buffer = lineBuffer;



  spi_device_transmit(spi, &t);



  digitalWrite(TFT_CS, HIGH);

}

Thanks a lot

Ygles

ESP32 Forum

ST7789 DMA configuration: Yellow displayed instead of red

ST7789 DMA configuration: Yellow displayed instead of red