add new LED key systick sample code

guowenxue

2018-05-16 a22d9c106276bb1819e583012d7ea41b6529b318

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#include <stdio.h>
 
#include "net/uip.h"
 
#include "lib/memb.h"
 
#include "net/uip-packetqueue.h"
 
#define MAX_NUM_QUEUED_PACKETS 2
MEMB(packets_memb, struct uip_packetqueue_packet, MAX_NUM_QUEUED_PACKETS);
 
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
 
/*---------------------------------------------------------------------------*/
static void
packet_timedout(void *ptr)
{
  struct uip_packetqueue_handle *h = ptr;
 
  PRINTF("uip_packetqueue_free timed out %p\n", h);
  memb_free(&packets_memb, h->packet);
  h->packet = NULL;
}
/*---------------------------------------------------------------------------*/
void
uip_packetqueue_new(struct uip_packetqueue_handle *handle)
{
  PRINTF("uip_packetqueue_new %p\n", handle);
  handle->packet = NULL;
}
/*---------------------------------------------------------------------------*/
struct uip_packetqueue_packet *
uip_packetqueue_alloc(struct uip_packetqueue_handle *handle, clock_time_t lifetime)
{
  PRINTF("uip_packetqueue_alloc %p\n", handle);
  if(handle->packet != NULL) {
    PRINTF("alloced\n");
    return NULL;
  }
  handle->packet = memb_alloc(&packets_memb);
  if(handle->packet != NULL) {
    ctimer_set(&handle->packet->lifetimer, lifetime,
               packet_timedout, handle);
  } else {
    PRINTF("uip_packetqueue_alloc failed\n");
  }
  return handle->packet;
}
/*---------------------------------------------------------------------------*/
void
uip_packetqueue_free(struct uip_packetqueue_handle *handle)
{
  PRINTF("uip_packetqueue_free %p\n", handle);
  if(handle->packet != NULL) {
    ctimer_stop(&handle->packet->lifetimer);
    memb_free(&packets_memb, handle->packet);
    handle->packet = NULL;
  }
}
/*---------------------------------------------------------------------------*/
uint8_t *
uip_packetqueue_buf(struct uip_packetqueue_handle *h)
{
  return h->packet != NULL? h->packet->queue_buf: NULL;
}
/*---------------------------------------------------------------------------*/
uint16_t
uip_packetqueue_buflen(struct uip_packetqueue_handle *h)
{
  return h->packet != NULL? h->packet->queue_buf_len: 0;
}
/*---------------------------------------------------------------------------*/
void
uip_packetqueue_set_buflen(struct uip_packetqueue_handle *h, uint16_t len)
{
  if(h->packet != NULL) {
    h->packet->queue_buf_len = len;
  }
}
/*---------------------------------------------------------------------------*/