电压表实验（AD转换）

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/*电压表精确到小数点后面三位*/
/*连线：电位器接IN0，AD_CS接CS0,CS1接KEY/LED_CS*/
#include<reg52.h>
typedef unsigned char uchar;
xdata uchar LED_CS _at_ 0x9000;
xdata uchar LED_OUTSEG _at_ 0x9004;
xdata uchar LED_OUTBIT _at_ 0x9002;

xdata uchar AD_CS _at_ 0x8000;
xdata uchar AD_MODE _at_ 0x8003;

code unsigned char LEDMAP[] = { // 八段管显示码
0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07,
0x7f, 0x6f, 0x77, 0x7c, 0x39, 0x5e, 0x79, 0x71
};
code unsigned char LEDWED[] = {0x20,0x10,0x08,0x04,0x02,0x01};
int num[6];
void delay(int ms)
{
int i,j;
for(i=0;i<ms;i++)
for(j=0;j<14;j++)
;
}
void adf()
{
AD_CS = 0;
delay(10);
}
void main()
{
int led_c=0;
unsigned char temp;
AD_MODE = 0x82;
AD_CS = 0;
while(1)
{
adf();
delay(10);
num[0] = AD_CS*5/256;
num[1] = AD_CS*5%256*10/256;
num[2] = AD_CS*5%256*10%256*10/256;
num[3] = AD_CS*5%256*10%256*10%256*10/256;
temp = LEDMAP[num[led_c]];
if(led_c == 0)
temp = temp|0x80;
LED_OUTBIT = LEDWED[led_c];
LED_OUTSEG = temp;
led_c = (led_c+1)%4;
delay(10);
}
}