STM32F108C8T6小白入门特训营__1.19 STM32串口通信_轮询模式

HAL_StatusTypeDef HAL_UART_Receive(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size, uint32_t Timeout)HAL_UART_Transmit(huart1,byte,sizeof(byte),HAL_MAX_DELAY); //成功接收到4个字节 把数据发回去