udp stm32代码

以下是使用STM32Cube HAL库实现UDP通信的示例代码，假设本地IP地址为192.168.1.100，远程IP地址为192.168.1.200，本地端口号为10000，远程端口号为20000：

#include "stm32f4xx_hal.h"
#include "lwip.h"

/* UDP handle */
static struct udp_pcb *udpHandle;

/* Local and remote IP address and port number */
#define LOCAL_IP_ADDR   "192.168.1.100"
#define REMOTE_IP_ADDR  "192.168.1.200"
#define LOCAL_PORT      10000
#define REMOTE_PORT     20000

/* Buffer for UDP data */
#define UDP_BUFFER_SIZE 1024
static uint8_t udpBuffer[UDP_BUFFER_SIZE];

/* Initialize network stack and UDP handle */
void udp_init(void)
{
  /* Initialize the LwIP stack */
  lwip_init();

  /* Initialize the UDP handle */
  udpHandle = udp_new();
  IP4_ADDR(&udpHandle->local_ip, LOCAL_IP_ADDR[0], LOCAL_IP_ADDR[1], LOCAL_IP_ADDR[2], LOCAL_IP_ADDR[3]);
  udpHandle->local_port = htons(LOCAL_PORT);
  IP4_ADDR(&udpHandle->remote_ip, REMOTE_IP_ADDR[0], REMOTE_IP_ADDR[1], REMOTE_IP_ADDR[2], REMOTE_IP_ADDR[3]);
  udpHandle->remote_port = htons(REMOTE_PORT);
}

/* Send UDP data */
void udp_send(uint8_t* data, uint16_t len)
{
  err_t err;
  struct pbuf *p;

  /* Allocate a new pbuf for sending UDP data */
  p = pbuf_alloc(PBUF_TRANSPORT, len, PBUF_RAM);
  memcpy(p->payload, data, len);

  /* Send the UDP data */
  err = udp_send(udpHandle, p);
  if (err != ERR_OK) {
    /* Handle UDP send error */
  }

  /* Free the pbuf */
  pbuf_free(p);
}

/* Receive UDP data */
void udp_receive(void)
{
  struct pbuf *p;
  err_t err;

  /* Receive UDP data */
  err = udp_recv(udpHandle, udp_receive_callback, NULL);
  if (err != ERR_OK) {
    /* Handle UDP receive error */
  }
}

/* Callback function for UDP receive */
void udp_receive_callback(void *arg, struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *addr, u16_t port)
{
  /* Process the received UDP data */
  memcpy(udpBuffer, p->payload, p->len);
  /* ... */

  /* Free the pbuf */
  pbuf_free(p);
}

需要注意的是，以上代码仅提供了UDP通信的基本框架，实际应用中需要根据具体需求进行修改和完善。另外，还需要在CubeMX中配置正确的网络参数和LwIP库。