adc.c

学习AVR单片机的基础实验程序 适合初学者学习提高

#include "iom16v.h"

/*ADC采样函数，采样第7通道信号，采样分辨率256*/
unsigned char get_ad(void) {

	unsigned char i;
	
	ADMUX = 0x67;			/*基准AVCC、左对齐、通道7*/
	ADCSRA = 0xC2;			/*使能、开启、4分频*/
	while(!(ADCSRA & (1 << ADIF)));	/*等待*/
	i = ADCH;
	ADCSRA &= ~(1 << ADIF);		/*清标志*/
	ADCSRA &= ~(1 << ADEN);		/*关闭转换*/

	return i;
}