RTT SPI 示波器图形对比

  uint8_t  WR_CMD (uint8_t cmd)  
{     
        uint8_t Rxdata;
    rt_spi_transfer(spi2_dev_ecat,&cmd,&Rxdata,1);
    return Rxdata;    
}
 uint8_t WR_CMD (uint8_t cmd)  
{     
    uint8_t Rxdata;
    HAL_SPI_TransmitReceive(&SPI2_Handler,&cmd,&Rxdata,1, 1000);       
    return Rxdata;    
}