main.c

该程序可以驱动ADC0809

#include<reg51.h>
#include<pin_define.c>
//#include<fuctions.c>

void select_channel(unsigned char channel)
{
	switch(channel)
	{
		case 0:A2=0;A1=0;A0=0;break;
		case 1:A2=0;A1=0;A0=1;break;
		case 2:A2=0;A1=1;A0=0;break;
		case 3:A2=0;A1=1;A0=1;break;
		case 4:A2=1;A1=0;A0=0;break;
		case 5:A2=1;A1=0;A0=1;break;
		case 6:A2=1;A1=1;A0=0;break;
		case 7:A2=1;A1=1;A0=1;break;
		default:break;
	}
}
void m_delay(int time)
{
	int i=0;
	while(time>0)
		{
			for(i=0;i<156;i++);
			time--;
		}
}

void start_convert(void)
{
	ALE=0;
	START=0;
	ALE=1;
	START=1;
	m_delay(10);
	ALE=0;
	START=0;


}
void init_0809(void)
{
	ALE=0;
	START=0;
	OE=0;
	EOC=1;
}
void read_data(void)
{
	OE=1;
	m_delay(4000);
	OE=0;

}

void main(void)
{
	
	while(1)
	{
		init_0809();
		select_channel(0);
		start_convert();
		while(EOC);
		while(!EOC);
		read_data();
	//	while(1);
	}

}