nes-proj/doc/example-use-service.c

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/*
* This file contains an example of how to call a service.
*
* This program implements a process that calls the service defined in
* example-service.h every second.
*/
#include <stdio.h>
#include "contiki.h"
/*
* We must include the header file for the service.
*/
#include "example-service.h"
/*
* All Contiki programs must have a process, and we declare it here.
*/
PROCESS(example_use_service_process, "Use example");
/*
* The program is to call the service once every second, so we use an
* event timer in order to run every second.
*/
static struct etimer timer;
/*---------------------------------------------------------------------------*/
/*
* Here we implement the process.
*/
PROCESS_THREAD(example_use_service_process, ev, data)
{
/*
* A process thread starts with PROCESS_BEGIN() and ends with
* PROCESS_END().
*/
PROCESS_BEGIN();
/*
* We loop for ever, calling the service once every second.
*/
while(1) {
/*
* We set a timer that wakes us up once every second.
*/
etimer_set(&timer, CLOCK_SECOND);
PROCESS_YIELD_UNTIL(etimer_expired(&timer));
/*
* We call the service. If the service is not registered, the
* SERVICE_CALL() statement does nothing. If we need to know if
* the service exists, we can use the SERVICE_FIND() function.
*/
printf("use example: calling example\n");
SERVICE_CALL(example_service, example_function());
}
/*
* And finally the process ends.
*/
PROCESS_END();
}
/*---------------------------------------------------------------------------*/