test-adc.c

深圳英培特EduKit-III实验箱实验程序。一共有10多个

/*********************************************************************
* File：		test-adc.c
* Author：	
* Desc：		
* History：
*********************************************************************/

#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>


/* cpu main clock */
#define MCLK		64000000

/* ADC register */
#define rADCCON		(*(volatile unsigned long *)0x01D40000)
#define rADCPSR		(*(volatile unsigned long *)0x01D40004)
#define rADCDAT		(*(volatile unsigned long *)0x01D40008)


/* bits definitions */
#define CON_FLAG	(1<<6)
#define CON_SLEEP	(1<<5)
#define CON_AIN0	(0<<2)
#define CON_AIN1	(1<<2)
#define CON_AIN2	(2<<2)
#define CON_AIN3	(3<<2)
#define CON_AIN4	(4<<2)
#define CON_AIN5	(5<<2)
#define CON_AIN6	(6<<2)
#define CON_AIN7	(7<<2)
#define CON_READ_START		(1<<1)
#define CON_ENABLE_START	(1<<0)


inline void start_adc(int ain)
{
	/* Start A/D conversion */
	rADCCON = CON_ENABLE_START|ain;
	/* To avoid The first FLAG error case. */
	while(rADCCON & CON_ENABLE_START);
}

inline void stop_adc(void)
{
	rADCCON = CON_SLEEP;
}


inline void set_clock(unsigned char prescaler)
{
	rADCPSR = (MCLK / 2 / 16 / (prescaler + 1));
	printf("ADC conversion freq. = %dHz\n", (MCLK / 2 / 16 / (prescaler + 1)));
}


int main(int argc, char** argv)
{
	int i;

	printf("Test ADC, if AIN2 == AIN4 then exit...\n");
	set_clock(20);

	for(;;)
	{
		start_adc(CON_AIN2);
		while(!(rADCCON & CON_FLAG));
		//To avoid The second FLAG error case
		for(i=0; i<rADCPSR; i++);
		printf("AIN2 = 0x%03x\r", rADCDAT);
	}
	stop_adc();
	printf("\n");

	return 0;
}