exercise_remotecontrol/simple_udp/led_remote_control.c

   1 #include <contiki.h>
   2 #include <contiki-lib.h>
   3 #include <contiki-net.h>
   4 #include <stdio.h>
   5 #include <dev/leds.h>
   6 #include <dev/button-sensor.h>
   7 #include <string.h>
   8
   9 ////////////////// DEBUGGING STUFF
  10 #define DEBUG DEBUG_PRINT
  11 #include "net/uip-debug.h"
  12 //////////////////////////////////
  13
  14 PROCESS(led_remote_control, "binary LED counter via button over UDP");
  15 AUTOSTART_PROCESSES(&led_remote_control);
  16
  17 static uip_ipaddr_t ipaddr;
  18 static uint8_t seq_id;
  19 static struct simple_udp_connection udp_conn;
  20 #define UDP_PORT 1337
  21
  22 static void recv(struct simple_udp_connection *c, const uip_ipaddr_t *source_addr,
  23   uint16_t source_port, const uip_ipaddr_t *dest_addr, uint16_t dest_port,
  24   const uint8_t *data, uint16_t datalen) {
  25
  26   PRINTF("recv from ");
  27   PRINT6ADDR(source_addr);
  28   PRINTF(" port %d: %d\n", source_port, *data);
  29
  30   if((*data) & 0x01) {
  31     leds_on(LEDS_GREEN);
  32   } else {
  33     leds_off(LEDS_GREEN);
  34   }
  35   if((*data) & 0x02) {
  36     leds_on(LEDS_YELLOW);
  37   } else {
  38     leds_off(LEDS_YELLOW);
  39   }
  40   PRINTF("toggled LEDs\n");
  41 }
  42
  43
  44 PROCESS_THREAD(led_remote_control, ev, data) {
  45   PROCESS_BEGIN();
  46
  47   uip_create_linklocal_allnodes_mcast(&ipaddr);
  48   if(!simple_udp_register(&udp_conn, uip_htons(UDP_PORT), NULL,
  49     uip_htons(UDP_PORT), recv)) {
  50     printf("o_O could not allocate simple UDP connection!\n");
  51   }
  52
  53   leds_init();
  54   leds_off(LEDS_ALL);
  55
  56   SENSORS_ACTIVATE(button_sensor);
  57
  58   static struct etimer timer;
  59   while(1) {
  60     PROCESS_WAIT_EVENT_UNTIL(ev == sensors_event && data == &button_sensor);
  61
  62     if(ev == sensors_event) {
  63       // debounce for 250 ms
  64       etimer_set(&timer, CLOCK_SECOND * 0.25);
  65       PROCESS_WAIT_EVENT_UNTIL(etimer_expired(&timer));
  66
  67       seq_id++; // start with 1 for better effect
  68
  69       PRINTF("Sending message to ");
  70       PRINT6ADDR(&ipaddr);
  71       PRINTF(": %d\n", seq_id);
  72
  73       simple_udp_sendto(&udp_conn, &seq_id, 1, &ipaddr);
  74     }
  75   }
  76
  77   PROCESS_END();
  78 }