[bsp][stm32] update drv_spi.c

bsp/stm32/libraries/HAL_Drivers/drv_spi.c

@@ -19,6 +19,7 @@
 
 #include "drv_spi.h"
 #include "drv_config.h"
+#include <string.h>
 
 //#define DRV_DEBUG
 #define LOG_TAG              "drv.spi"
@@ -276,7 +277,8 @@ static rt_uint32_t spixfer(struct rt_spi_device *device, struct rt_spi_message *
             if ((spi_drv->spi_dma_flag & SPI_USING_TX_DMA_FLAG) && (spi_drv->spi_dma_flag & SPI_USING_RX_DMA_FLAG))
             {
                 state = HAL_SPI_TransmitReceive_DMA(spi_handle, (uint8_t *)message->send_buf, (uint8_t *)message->recv_buf, message->length);
-             }else
+            }
+            else
             {
                 state = HAL_SPI_TransmitReceive(spi_handle, (uint8_t *)message->send_buf, (uint8_t *)message->recv_buf, message->length, 1000);
             }
@@ -294,6 +296,7 @@ static rt_uint32_t spixfer(struct rt_spi_device *device, struct rt_spi_message *
         }
         else
         {
+            memset(message->recv_buf, 0xff, message->length);
             if (spi_drv->spi_dma_flag & SPI_USING_RX_DMA_FLAG)
             {
                 state = HAL_SPI_Receive_DMA(spi_handle, (uint8_t *)message->recv_buf, message->length);