5 使用spi传输数据，回读全为FF

发布于 2022-06-24 17:03:46 浏览：914 订阅该版

我使用的是fsl_lpspi.c里的传输函数
```c
    if(wlen>1)
    {
    spiXfer1.txData = wbuf;
    spiXfer1.rxData = RT_NULL;
    spiXfer1.dataSize = 1;
    spiXfer1.configFlags = kLPSPI_MasterPcs0 | kLPSPI_MasterPcsContinuous | kLPSPI_MasterByteSwap;
    status = LPSPI_MasterTransferBlocking(pBase, &spiXfer1);

spiXfer2.txData = &wbuf[1];
    spiXfer2.rxData = RT_NULL;
    spiXfer2.dataSize = wlen-1;
    spiXfer2.configFlags = kLPSPI_MasterPcs0 | kLPSPI_MasterPcsContinuous | kLPSPI_MasterByteSwap;

status = LPSPI_MasterTransferBlocking(pBase, &spiXfer2);
    }else{
        spiXfer1.txData = wbuf;
        spiXfer1.rxData = RT_NULL;
        spiXfer1.dataSize = wlen;
        spiXfer1.configFlags = kLPSPI_MasterPcs0 | kLPSPI_MasterPcsContinuous | kLPSPI_MasterByteSwap;
        status = LPSPI_MasterTransferBlocking(pBase, &spiXfer1);

rt_hw_us_delay(DELAY_COUNT);
        spiXfer2.txData = RT_NULL;
        spiXfer2.rxData = rbuf;
        spiXfer2.dataSize = rlen;
        spiXfer2.configFlags = kLPSPI_MasterPcs0 | kLPSPI_MasterPcsContinuous | kLPSPI_MasterByteSwap
        status = LPSPI_MasterTransferBlocking(pBase, &spiXfer2);
    }
```