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STM32F407+LAN8720A +LWIP +FreeRTOS ping通
上一篇实现了LWIP ping 通

本篇实现UDP通讯

实现如下功能：

1. 串口1空闲中断+DMA接收，收到数据用UDP发送
2. UDP接收，收到数据用串口1发送

STM32CUBEIDE配置和代码

1. 配置UARAT1的空闲中断+DMA接收

UART1接收到数据，释放信号量，在任务中进行数据处理（UDP发送）

/* USER CODE END Header_StartTask03 */
void StartTask03(void const * argument)
{/* USER CODE BEGIN StartTask03 */uint16_t len_data;HAL_UARTEx_ReceiveToIdle_DMA(&huart1, buletooth_rxBuf, 250);hdma_usart1_rx.Instance->CR  &= ~(DMA_IT_HT);//取消接收一半中断/* Infinite loop */for(;;){//UART RECEIVED, UDP SENDosSemaphoreWait (BinarySem_BLUE_RecHandle, osWaitForever);if(ble_rxBuf_len > 0){len_data = ble_rxBuf_len;udp_client_send_data(buletooth_rxBuf, len_data);}}/* USER CODE END StartTask03 */
}/* Private application code --------------------------------------------------*/
/* USER CODE BEGIN Application */
void HAL_UARTEx_RxEventCallback(UART_HandleTypeDef *huart, uint16_t Size)
{if(huart->Instance ==  USART1){ble_rxBuf_len = Size;osSemaphoreRelease (BinarySem_BLUE_RecHandle);HAL_UARTEx_ReceiveToIdle_DMA(&huart1, buletooth_rxBuf, 250);}
}

2. 配置UDP

void udp_client_init(void)
{ip_addr_t serverIP;err_t err;IP4_ADDR(&serverIP, 192, 168, 111, 11);upcb = udp_new();if (upcb != NULL){/* 配置本地端口 */upcb->local_port = UDP_LOCAL_PORT;/* 配置服务器IP和端口号*/err = udp_connect(upcb, &serverIP, UDP_REMOTE_PORT);if (err == ERR_OK){/* 注册接收回调函数 */udp_recv(upcb, udp_receive_callback, NULL);printf("UDP INIT SUCCESS\r\n");}else{udp_remove(upcb);}}
}
static void udp_receive_callback(void *arg, struct udp_pcb *upcb,struct pbuf *p, const ip_addr_t *addr, u16_t port)
{if (p != NULL){struct pbuf *ptmp = p;while (ptmp != NULL){memset(cache_udprece, 0, sizeof(cache_udprece));