Connect a TFT with ST7735S to ESP32 with ESP-IDF

[nefen1]

I cannot communicate with the display. Any help is highly wellcome!

Following are the main configurations data:
spi_bus_config_t:

Code: Untitled.cpp Select all

        

spi_bus_config_t BusCfg= {

          .mosi_io_num=23,            

          .miso_io_num=-1, 

          .sclk_io_num=18,            

          .quadwp_io_num=-1,

          .quadhd_io_num=-1,

        };

spi_device_interface_config_t:

Code: Untitled.cpp Select all

        spi_device_interface_config_t DevCfg={

            .mode=0,                                //SPI mode 0

            .cs_ena_pretrans=2,                     

            .clock_speed_hz=40*1000*1000,          

            .spics_io_num=5,                       //CS pin set in init

            .flags = SPI_DEVICE_HALFDUPLEX,

            .queue_size=7,                          /

            .pre_cb=NULL,

            .post_cb=NULL,

        };

THe code for transmitting a command:

Code: Untitled.cpp Select all

void tft_cmd(const uint8_t cmd){

 esp_err_t ret;

  spi_transaction_t t;

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

  t.length=8;                   

  t.tx_data[0]=cmd;                     

  t.flags=SPI_TRANS_USE_TXDATA | SPI_TRANS_MODE_DIO;

  gpio_set_level(Dc, 0);                  

  ret=spi_device_polling_transmit(Spi, &t); 

  assert(ret==ESP_OK);                 

Code for transmitting data:

Code: Untitled.cpp Select all

void tft_data(const uint8_t *data, int len)

{

  esp_err_t ret;

  spi_transaction_t t;



  if (len==0) return;                         //no need to send anything

  memset(&t, 0, sizeof(t));                   //Zero out the transaction

  t.length=len*8;                             //Len is in bytes, transaction length is in bits.

  t.tx_buffer=data;  

     t.flags=SPI_TRANS_MODE_DIO;

  gpio_set_level(Dc, 1);

  ret=spi_device_polling_transmit(Spi, &t); 

  assert(ret==ESP_OK);                        

}

What am I doing wrong?

[Sprite]

Why are you using DIO mode?

[nefen1]

Thank you for posting!

Yes, DIO is wrong.

Finally I had solved it. Mode should be 3 and not 0