ESP32 Forum

Posted: **Wed Oct 20, 2021 3:54 pm**

开发板是nodemcu esp32
esp-idf v4.3
代码如下

Code: [Select all] [Expand/Collapse]

void app_main(void)
{
    //SPI测试代码
    luat_spi_t spi = {
            .id =2,
            .CPHA = 0,
            .CPOL = 0,
            .bit_dict = 8,
            .master = 0,
            .mode = 0,
            .cs = 5,
            .bandrate = 20*1000*1000
    };
    if (luat_spi_setup(&spi) == 0)
    {
        printf("spi setup  success\n");
    }
    printf("luat_spi_transfer: %d",luat_spi_transfer(2,"0x9F",recv_buf,1));
    char* recv_buf0 = "";
    printf("luat_spi_transfer: %d",luat_spi_transfer(2,"0x00",recv_buf0,1));
    printf(recv_buf0);
    char* recv_buf1 = "";
    printf("luat_spi_transfer: %d",luat_spi_transfer(2,"0x00",recv_buf1,1));
    printf(recv_buf1);
    char* recv_buf2 = "";
    printf("luat_spi_transfer: %d",luat_spi_transfer(2,"0x00",recv_buf2,1));
    printf(recv_buf2);
}
//十六进制字符串转uint8_t
uint8_t AsciiToHex8(const char * src)
{
    luat_log_log(1,LUAT_LOG_TAG," hex str: %s\n",src);
    char* src0;
    uint8_t ret;
    ret = strtol(src,&src0,16);
    luat_log_log(1,LUAT_LOG_TAG,"ret: %x\n",ret);
    return ret;
}
//SPI收发
int luat_spi_transfer(int spi_id, const char *send_buf, char *recv_buf, size_t length)
{
    //判断是否超出32位 超过续开启DMA
    if(length*8 > 32)
    {
        luat_log_error(LUAT_LOG_TAG,"Data exceeds 32 bits");
        return -1;
    }
    //判断长度是否为0 为0则不发送
    if(length == 0)
    {
        luat_log_error(LUAT_LOG_TAG,"Data length can't be 0");
        return -1;
    }
    //判断SPI ID是否合法
    if (spi_id == 1 || spi_id == 2)
    {
        //初始化发送配珠
        printf("init spi_transaction_t");
        uint8_t *hex_recv_buf = NULL;
        spi_transaction_t t;
        memset(&t,0,sizeof(t));
        luat_log_debug(LUAT_LOG_TAG,"Data is %d byte\n",length);
        t.length = length*8;
        //将数据转换成uint8_t
        printf("convert spi_transaction_t");
        uint8_t hex_send_buf = AsciiToHex8(send_buf);
        luat_log_debug(LUAT_LOG_TAG,"AsciiToHex8 %x\n",hex_send_buf);
        t.tx_buffer = hex_send_buf;
        luat_log_debug(LUAT_LOG_TAG,"Recv Hex\n");
        t.rx_buffer = hex_recv_buf;
        printf("send spi_transaction_t");
        esp_err_t ret = spi_device_transmit(spi_h, &t);
        if (ret != ESP_OK)
            return -1;
        HexToAscii(hex_recv_buf,recv_buf,sizeof(hex_recv_buf));
        luat_log_log(1,LUAT_LOG_TAG,"SPI recv error check: %d\n",ret);
    }
    return 0;
}

串口输出：

: `(2]IX49JF%O]U1R`@S]I6O.png (211.81 KiB) Viewed 1829 times

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