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 459 times

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

Code: [Select all] [Expand/Collapse]

#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