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:

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1.        
2. spi_bus_config_t BusCfg= {
3.           .mosi_io_num=23,            
4.           .miso_io_num=-1,
5.           .sclk_io_num=18,            
6.           .quadwp_io_num=-1,
7.           .quadhd_io_num=-1,
8.         };

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spi_device_interface_config_t:

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1.         spi_device_interface_config_t DevCfg={
2.             .mode=0,                                //SPI mode 0
3.             .cs_ena_pretrans=2,                    
4.             .clock_speed_hz=40*1000*1000,          
5.             .spics_io_num=5,                       //CS pin set in init
6.             .flags = SPI_DEVICE_HALFDUPLEX,
7.             .queue_size=7,                          /
8.             .pre_cb=NULL,
9.             .post_cb=NULL,
10.         };

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THe code for transmitting a command:

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1. void tft_cmd(const uint8_t cmd){
2.  esp_err_t ret;
3.   spi_transaction_t t;
4.   memset(&t, 0, sizeof(t));              
5.   t.length=8;                  
6.   t.tx_data[0]=cmd;                    
7.   t.flags=SPI_TRANS_USE_TXDATA | SPI_TRANS_MODE_DIO;
8.   gpio_set_level(Dc, 0);                  
9.   ret=spi_device_polling_transmit(Spi, &t);
10.   assert(ret==ESP_OK);                

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Code for transmitting data:

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1. void tft_data(const uint8_t *data, int len)
2. {
3.   esp_err_t ret;
4.   spi_transaction_t t;
5.  
6.   if (len==0) return;                         //no need to send anything
7.   memset(&t, 0, sizeof(t));                   //Zero out the transaction
8.   t.length=len*8;                             //Len is in bytes, transaction length is in bits.
9.   t.tx_buffer=data;  
10.      t.flags=SPI_TRANS_MODE_DIO;
11.   gpio_set_level(Dc, 1);
12.   ret=spi_device_polling_transmit(Spi, &t);
13.   assert(ret==ESP_OK);                        
14. }

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What am I doing wrong?

[ESP_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