ESP32 Forum

Posted: **Mon Dec 20, 2021 10:01 am**

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。

Posted: **Tue May 03, 2022 2:56 am**

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

Posted: **Tue Jul 12, 2022 1:41 am**

1、SPI配置为3Wire 9Bit模式

Code: [Select all] [Expand/Collapse]

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);
}

GeSHi © Codebox Plus Extension

2、写1R1D

Code: [Select all] [Expand/Collapse]

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 2995 times

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