在MPU中已经配置了不缓存，这里可以不调用这句了，提升性能

bspMCU/My_print.c

@@ -40,7 +40,7 @@ int USART_Send(char *_pBuffer, uint32_t _iSize)
 //    int iRet = HAL_UART_Transmit(ptUartUserData->m_uart, (uint8_t *)_pBuffer, _iSize, 100);
 //    HAL_GPIO_WritePin(RS485_2_DIR_GPIO_Port, RS485_2_DIR_Pin,GPIO_PIN_RESET);
     RD_MEMCPY(uart_tx_buffer, _pBuffer, _iSize);
-    SCB_CleanDCache_by_Addr((uint32_t*)uart_tx_buffer, _iSize);
+    //SCB_CleanDCache_by_Addr((uint32_t*)uart_tx_buffer, _iSize);
     int iRet = HAL_UART_Transmit_DMA(ptUartUserData->m_uart, (uint8_t *)uart_tx_buffer, _iSize);
 
     return iRet;