ad.c

小区可视对讲键盘检测程序.利用pt6964芯片.

#include<stc12c5410ad.h>
/*-------------------------------------

---------------------------------------*/
void adc_initial(void)
{
	P1M0 = P1M0|0x01;  	//set p10   open drain mode
	P1M1 = P1M1|0x01;
	ADC_CONTR = 0xe0; 	//open adc power;
						//select channel 0
						//speed 210 clocks
}
unsigned char single_ad(void)
{
	ADC_DATA = 0;				   	//clear result register
	ADC_CONTR = ADC_CONTR|0x08;	   	//begin adc
	while(!(ADC_CONTR&0x10)) ;	 	//wait adc finish
	ADC_CONTR = ADC_CONTR & 0xe7;	//clear flags when adc finish
	return ADC_DATA;
}