#include <linux/errno.h>
#include <rtl.h>
#include <time.h>

#include <rtl_sched.h>
#include <rtl_fifo.h>

#include <pthread.h>
#include <mbuff.h>
#include <math.h>

#include "adc.h" // to use device driver of D/A board

#define SAMPLING_PERIOD 100e-6 // sampling period [sec]

pthread_t mytask;

void *thread_code(void *arg)
{
	int count = 0;

	while(1){
		int ret;

		ret = pthread_wait_np();

		count++;
		if(count == 2){
			da_conv(1.0, 0); // output 1[V] at CH0
			count = 0;
		}else{
			da_conv(0, 0); // output 0[V] at CH0
		}
	}

       	return 0;
}

int
init_module(void)
{
	pthread_attr_t attr;
	struct sched_param sched_param;
	int ret;

	pthread_attr_init (&attr);       // Initialization for attributes
	pthread_attr_setfp_np(&attr, 1); // Set FPU available
	sched_param.sched_priority = 1;  // Set the task priority highest
	pthread_attr_setschedparam (&attr, &sched_param);

	ret = pthread_create (&mytask,  &attr, thread_code, (void *)0);
	pthread_make_periodic_np(mytask, gethrtime(), SAMPLING_PERIOD * 1.0e9);

	init_dac();

	return 0;
}

void
cleanup_module(void)
{
	pthread_cancel(mytask);
	pthread_join(mytask, NULL);

	cleanup_dac();
}