Hi, I have a project that uses lwip without RTOS, I based my project on this example: http://dev.ti.com/tirex/explore/node?node=AOoA7W7yQeZdRcpVGT6w3Q__J4.hfJy__LATEST
The project works fine, but I've tried to add ping support without success. Since there's no a ping example on the Resource Explorer, I used this as a guide:
http://download.savannah.nongnu.org/releases/lwip/ (contrib-2.1.0/apps/ping)
Then I modified my lwipopts.h file: I enabled LWIP_ICMP and LWIP_RAW (see attached file) but no luck.
What I've noticed is that when I ping my dev kit, the programa doesn't enter this if:
Any help would be appreciated. I attached my ping.c file
ping.c
/*
* ping.c
*
* Created on: 13 may. 2019
* Author: RICHARD
*/
#include "ping.h"
#include "lwip/mem.h"
#include "lwip/raw.h"
#include "lwip/icmp.h"
#include "lwip/netif.h"
#include "lwip/sys.h"
#include "lwip/timeouts.h"
#include "lwip/inet_chksum.h"
#include "lwip/prot/ip4.h"
#include "lwip/sockets.h"
#include "lwip/inet.h"
#include <string.h>
#ifndef PING_DEBUG
#define PING_DEBUG LWIP_DBG_ON
#endif
/** ping receive timeout - in milliseconds */
#ifndef PING_RCV_TIMEO
#define PING_RCV_TIMEO 1000
#endif
/** ping delay - in milliseconds */
#ifndef PING_DELAY
#define PING_DELAY 1000
#endif
/** ping identifier - must fit on a u16_t */
#ifndef PING_ID
#define PING_ID 0xAFAF
#endif
/** ping additional data size to include in the packet */
#ifndef PING_DATA_SIZE
#define PING_DATA_SIZE 32
#endif
/** ping result action - no default action */
#ifndef PING_RESULT
#define PING_RESULT(ping_ok)
#endif
static const ip_addr_t* ping_target;
static u16_t ping_seq_num;
static struct raw_pcb *ping_pcb;
static void ping_prepare_echo( struct icmp_echo_hdr *iecho, u16_t len)
{
size_t i;
size_t data_len = len - sizeof(struct icmp_echo_hdr);
ICMPH_TYPE_SET(iecho, ICMP_ECHO);
ICMPH_CODE_SET(iecho, 0);
iecho->chksum = 0;
iecho->id = PING_ID;
iecho->seqno = lwip_htons(++ping_seq_num);
/* fill the additional data buffer with some data */
for(i = 0; i < data_len; i++) {
((char*)iecho)[sizeof(struct icmp_echo_hdr) + i] = (char)i;
}
iecho->chksum = inet_chksum(iecho, len);
}
static void ping_send(struct raw_pcb *raw, const ip_addr_t *addr)
{
struct pbuf *p;
struct icmp_echo_hdr *iecho;
size_t ping_size = sizeof(struct icmp_echo_hdr) + PING_DATA_SIZE;
LWIP_DEBUGF( PING_DEBUG, ("ping: send "));
ip_addr_debug_print(PING_DEBUG, addr);
LWIP_DEBUGF( PING_DEBUG, ("\n"));
LWIP_ASSERT("ping_size <= 0xffff", ping_size <= 0xffff);
p = pbuf_alloc(PBUF_IP, (u16_t)ping_size, PBUF_RAM);
if (!p) {
return;
}
if ((p->len == p->tot_len) && (p->next == NULL)) {
iecho = (struct icmp_echo_hdr *)p->payload;
ping_prepare_echo(iecho, (u16_t)ping_size);
raw_sendto(raw, p, addr);
#ifdef LWIP_DEBUG
ping_time = sys_now();
#endif /* LWIP_DEBUG */
}
pbuf_free(p);
}
static void ping_timeout(void *arg)
{
struct raw_pcb *pcb = (struct raw_pcb*)arg;
LWIP_ASSERT("ping_timeout: no pcb given!", pcb != NULL);
ping_send(pcb, ping_target);
sys_timeout(PING_DELAY, ping_timeout, pcb);
}
static u8_t ping_recv(void *arg, struct raw_pcb *pcb, struct pbuf *p, const ip_addr_t *addr)
{
struct icmp_echo_hdr *iecho;
LWIP_UNUSED_ARG(arg);
LWIP_UNUSED_ARG(pcb);
LWIP_UNUSED_ARG(addr);
LWIP_ASSERT("p != NULL", p != NULL);
if ((p->tot_len >= (PBUF_IP_HLEN + sizeof(struct icmp_echo_hdr))) &&
pbuf_header(p, -PBUF_IP_HLEN) == 0) {
iecho = (struct icmp_echo_hdr *)p->payload;
if ((iecho->id == PING_ID) && (iecho->seqno == lwip_htons(ping_seq_num))) {
LWIP_DEBUGF( PING_DEBUG, ("ping: recv "));
ip_addr_debug_print(PING_DEBUG, addr);
LWIP_DEBUGF( PING_DEBUG, (" %"U32_F" ms\n", (sys_now()-ping_time)));
/* do some ping result processing */
PING_RESULT(1);
pbuf_free(p);
return 1; /* eat the packet */
}
/* not eaten, restore original packet */
pbuf_header(p, PBUF_IP_HLEN);
}
return 0; /* don't eat the packet */
}
void ping_raw_init(void){
ping_pcb = raw_new(IP_PROTO_ICMP);
LWIP_ASSERT("ping_pcb != NULL", ping_pcb != NULL);
raw_recv(ping_pcb, ping_recv, NULL);
raw_bind(ping_pcb, IP_ADDR_ANY);
sys_timeout(PING_DELAY, ping_timeout, ping_pcb);
}
