lwIP UDP thoughut w/o an RTOS

Hello Danny,

As I wrote above I don’t use lwip for receiving UDP packets in my application. If you start with Nios etc. you should use lwip first, because it’s a working system. When you have built a stable system you can add some hardware accelerations to achieve higher bandwidth.

The following code shows a very small UDP receive routine. I used this one for testing purposes only. After you have sent 1024 packets to port 1409 there will be a message.

#include "lwip/debug.h"# include "lwip/stats.h"# include "lwip/udp.h"
u32_t udp_packets;
static void udp_test_recv(void *arg, struct udp_pcb *upcb, struct pbuf *p,
                          struct ip_addr *addr, u16_t port)
{
/*
  printf("\nUDP packet received from: %d.%d.%d.%d : %d",
          (addr->addr)&0xFF, ((addr->addr)>>8)&0xFF,
          ((addr->addr)>>16)&0xFF, (addr->addr)>>24, port);
*/
  udp_packets++;
  //printf("\nlen: %d, tot_len: %d", p->len, p->tot_len);
  if (udp_packets % 1024 == 0)
    printf("\n%d udp_packets received", udp_packets);
  pbuf_free(p);
}
/*-----------------------------------------------------------------------------------*/
void
udp_test_init(void)
{
  struct udp_pcb *pcb;
  printf("udp_init\n");
  
  udp_packets = 0;
  
  pcb = udp_new();
  udp_bind(pcb, IP_ADDR_ANY, 1409);
  udp_recv(pcb, udp_test_recv, NULL);
}
/*-----------------------------------------------------------------------------------*/

Regards,

niosIIuser