UART Interrupt

示例工程流程图如图 33所示：

1. 配置UART模块。

   g_uart_handle.p_instance = SERIAL_PORT_GRP;
   g_uart_handle.init.baud_rate = 115200;
   g_uart_handle.init.data_bits = UART_DATABITS_8;
   g_uart_handle.init.stop_bits  = UART_STOPBITS_1;
   g_uart_handle.init.parity = UART_PARITY_NONE;
   g_uart_handle.init.hw_flow_ctrl = UART_HWCONTROL_NONE;
   g_uart_handle.init.rx_timeout_mode = UART_RECEIVER_TIMEOUT_ENABLE;
   hal_uart_deinit(&g_uart_handle);
   hal_uart_init(&g_uart_handle);
   

   UART详细配置参数请参考 UART DMA 章节。

2. 调用hal_uart_transmit_it()接口发送数据，接收结果与状态通过回调函数hal_uart_rx_cplt_callback()返回，用户可在此函数自定义可执行操作。因采用非阻塞方式的接口，需在后续步骤中用while判断是否收发完成。

   hal_uart_transmit_it(&g_uart_handle, (uint8_t *)"\r\nPlease input characters(<126) 
                        and end with newline.\r\n", 55);
   while (!g_tx_done);
   g_tx_done = 0;
   hal_uart_transmit_it(&g_uart_handle, (uint8_t *)"Input:\r\n", 8);
   while (!g_tx_done);
   

3. 调用hal_uart_receive_it()接口接收数据，接收结果与状态通过回调函数hal_uart_rx_cplt_callback()返回，在接收完成的回调里调用hal_uart_receive_it()继续接收，同时通过hal_uart_transmit_it()发送接收到的数据，发送结果与状态通过回调函数hal_uart_tx_cplt_callback()返回，直到收到的数据为‘0’时，测试结束。代码如下：

   void hal_uart_tx_cplt_callback(uart_handle_t *huart)
   {
       g_tx_done = 1;
   }
   
   void hal_uart_rx_cplt_callback(uart_handle_t *huart)
   {
       g_rx_done = 1;
       g_rx_len  = g_uart_handle.rx_xfer_size - g_uart_handle.rx_xfer_count;
       hal_uart_receive_it(&g_uart_handle, rx_data, 128);
   }
   
   do {
       while (!g_rx_done);
       g_rx_done = 0;
       g_tx_done = 0;
       hal_uart_transmit_it(&g_uart_handle, rx_data, g_rx_len);
       while (!g_tx_done);
   } while (rx_data[0] != '0');
   

1. 用GProgrammer下载uart_interrupt.bin至开发板。
2. 将开发板串口连接至PC端，打开并配置GRUart。
3. 在GRUart的Receive Data窗口中将会显示通过UART接收与发送的数据信息。