esp32-s3如何进行3线spi通信？[已解决]

[jr-test]

想通过esp32-s3驱动3线spi的屏，但是一直初始化不成功。所以来求助一下esp32的3线spi通信。

[enjoyic]

不知道通过st7789驱动修改是否可以，好像st7789也需要spi配置的。

[lisongzehn]

1、SPI配置为3Wire 9Bit模式

Code: Untitled.c Select all

void SPI_3Wire_Interface_Init(  esp_err_t* ret, \

                                spi_device_handle_t* spi, \

                                spi_bus_config_t* buscfg, \

                                spi_device_interface_config_t* devcfg)

{

    buscfg->miso_io_num=-1;

    buscfg->mosi_io_num=PIN_NUM_SPI_3WIRE_SDA_IO;

    buscfg->sclk_io_num=PIN_NUM_SPI_3WIRE_SCLK_O;

    buscfg->quadwp_io_num=-1;

    buscfg->quadhd_io_num=-1;

    //buscfg.data4_io_num=-1;

    //buscfg.data5_io_num=-1;

    //buscfg.data6_io_num=-1;

    //buscfg.data7_io_num=-1;

    buscfg->max_transfer_sz=xSPI_Max_transfer_size;	//= 4096 Byte	

    buscfg->flags=SPICOMMON_BUSFLAG_DUAL;	

    //buscfg.intr_flags=;	



    devcfg->command_bits=1;		//D/Cx位，0 cmd， 1 data

    //devcfg.address_bits=24;

    //devcfg.dummy_bits=;

    devcfg->mode=xSPI_CPOL_CPHA_mode;	//CPOL, CPHA xSPI_CPOL_CPHA_mode = 0	

    //devcfg.duty_cycle_pos;	

    //devcfg.cs_ena_pretrans;

    //devcfg.cs_ena_posttrans;

    devcfg->clock_speed_hz=xSPI_Clock_Speed_For_DM_Initial; //=1MHz        

    //devcfg.input_delay_ns=;

    //devcfg->spics_io_num=PIN_NUM_SPI_4WIRE_2_CS_O;	

    devcfg->flags=SPI_DEVICE_3WIRE | SPI_DEVICE_HALFDUPLEX;	//3线半双工

    devcfg->queue_size=7;                          

    //*devcfg.pre_cb=RS_transfer_callback; 	//D/C(RS)处理

    //devcfg.post_cb=;



    //Initialize the SPI bus

    *ret=spi_bus_initialize(LCD_HOST, buscfg, SPI_DMA_CH_AUTO);   

    ESP_ERROR_CHECK(*ret);

    //Attach the LCD to the SPI bus

    *ret=spi_bus_add_device(LCD_HOST, devcfg, spi);

    ESP_ERROR_CHECK(*ret);

}

2、写1R1D

Code: Untitled.c Select all

lcd_write_1R1D(0xFE, 0x20); 



void lcd_write_1R1D(const uint8_t cmd, const uint8_t data)

{

    DM_CS(0);



    //发送cmd

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

    sendcfg.cmd = 0;                        //cmd = 0

    sendcfg.length=8;                       

    sendcfg.tx_buffer = &cmd;

    ret=spi_device_polling_transmit(spi, &sendcfg);     

    assert(ret==ESP_OK);                    



    //发送data

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

    sendcfg.cmd = 1;                        //data = 1

    sendcfg.length=8;                       

    sendcfg.tx_buffer = &data;

    ret=spi_device_polling_transmit(spi, &sendcfg);     

    assert(ret==ESP_OK);                    



    DM_CS(1);

}

3、波形图

1R1D波形图.jpg (95.97 KiB) Viewed 4612 times