adc._c

用AVR单片机做的一些程序,包括跑马灯显示,PWM产生,ADC转换等

#include "iom128v.h"

/*ADC采样函数，采样第0通道信号，采样分辨率1024*/
unsigned int get_ad(void) {

	unsigned int i;
	
	ADMUX = (1 << REFS0);								/*基准AVCC、通道0*/
	ADCSRA = (1 << ADEN) | (1 << ADSC)					/*使能、开启*/
			| (1 << ADPS1) | (1 << ADPS0);				/*8分频*/
	while(!(ADCSRA & (1 << ADIF)));						/*等待采样结束*/
	i = ADC;											/*读取AD结果*/
	ADCSRA &= ~(1 << ADIF);								/*清标志*/
	ADCSRA &= ~(1 << ADEN);								/*关闭转换*/

	return i;											/*返回结果*/
}