LWIP为什么无法发送UDP,是要设置其他的东西吗？

julonger

__IO uint8_t iptab[4];
char UDPData[]="LwIP UDP 客户端在 Luminary 微控制器上的测试\r\n";
struct udp_pcb *upcb;
struct pbuf *p;
struct ip_addr *addr;

p=pbuf_alloc(PBUF_RAW, sizeof(UDPData), PBUF_RAM);
  p->payload=&UDPData;

addr->addr = htonl(0xc0a80116);
iptab[0] = (uint8_t)((uint32_t)(addr->addr) >> 24);
iptab[1] = (uint8_t)((uint32_t)(addr->addr) >> 16);
iptab[2] = (uint8_t)((uint32_t)(addr->addr) >> 8);
iptab[3] = (uint8_t)((uint32_t)(addr->addr));

printf("\n\rReceiver's IP address:");
  printf("%d,%d,%d,%d",iptab[3], iptab[2], iptab[1], iptab[0]);

upcb = udp_new();
udp_bind(upcb, NULL, 7);
udp_connect(upcb, addr, UDP_CLIENT_PORT);
udp_send(upcb, p);
udp_disconnect(upcb);
pbuf_free(p);

正点原子

参考下这个吧:http://www.openedv.com/posts/list/25178.htm