main.c

博创arm 3000开发板实验

/************************************************\
*	by threewater<[e-mail]>	*
*		2003.12.18			*
*						*
\***********************************************/

#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/ioctl.h>
#include <pthread.h>
#include "hardware.h"

#define ADCCON_FLAG		0x40
#define ADCCON_SLEEP		0x20

#define ADCCON_ADIN0		(0x0<<2)
#define ADCCON_ADIN1		(0x1<<2)
#define ADCCON_ADIN2		(0x2<<2)
#define ADCCON_ADIN3		(0x3<<2)
#define ADCCON_ADIN4		(0x4<<2)
#define ADCCON_ADIN5		(0x5<<2)
#define ADCCON_ADIN6		(0x6<<2)
#define ADCCON_ADIN7		(0x7<<2)

#define ADCCON_READ_START	0x2
#define ADCCON_ENABLE_START	0x1

void init_ADdevice(void)
{
	ADCPSR=20;
	ADCCON=ADCCON_SLEEP;
}

int GetADresult(int channel)
{
	int i=0;
	ADCCON=(channel<<2)|ADCCON_ENABLE_START;

	//To avoid The first FLAG error case.
	//(The START bit is cleared in one ADC clock.)
//	while(ADCCON) &1);
	for(;i<100;i++);
	//To avoid The second FLAG error case
	while(!( (ADCCON) & ADCCON_FLAG));
	return ADCDAT;
}
static int stop=0;

void* comMonitor(void* data)
{
	getchar();
	stop=1;
	return NULL;
}

int main(void)
{
	int i;
	float d;
	pthread_t th_com;
	void * retval;

	//set s3c44b0 AD register and start AD
	init_ADdevice();
	usleep(1);
                                                                                
	/* Create the threads */
	pthread_create(&th_com, NULL, comMonitor, 0);

	printf("\nPress Enter key exit!\n");

	while( stop==0 ){
		for(i=0; i<=3; i++){//采样0~3路A/D值
			d=((float)GetADresult(i)*2.5)/1024.0;
			printf("a%d=%f\t",i,d);
			usleep(10);
		}
		printf("\r");
	}
	/* Wait until producer and consumer finish. */
	pthread_join(th_com, &retval);

	printf("\n");
	return 0;
}