ADC test for BeagleBone Black.

test_adc.c

#include <stdio.h>
#include <time.h>

int main(int argc, char *argv[]){
	FILE *Handle = NULL;
	char *Slots = "/sys/devices/bone_capemgr.9/slots";
	char *AIn1 = "/sys/devices/ocp.2/helper.14/AIN1";
	char buf[10] = {0};
	struct timespec start, end;
	int i;

	if((Handle = fopen(Slots, "rb+")) == NULL){
		printf("Unable to register adc.\n");
		return 1;
	}
	fwrite("cape-bone-iio", sizeof(char), 13, Handle);
	fclose(Handle);
	
	if((Handle = fopen(AIn1, "rb")) == NULL){
		printf("Unable to open AIN1.\n");
		return 1;
	}

	clock_gettime(CLOCK_MONOTONIC ,&start);

	fread(buf, sizeof(char), 10, Handle);

	clock_gettime(CLOCK_MONOTONIC ,&end);

	fclose(Handle);

	printf("Get value from AIN1 : %s\n", buf);
	printf("Time elapsed %d [ns]\n", end.tv_nsec - start.tv_nsec);
	
	return 0;
}