STC8H1k28单片机自带adc跳来跳去求分析 -

//头文件-----------------------------------------------
#include <stc8.h>
#include<stdio.h>
#include <intrins.h>
#define ADCTIM (*(unsigned char volatile xdata *)0xfea8)
//端口声明----------------------------------------------
sbit led1=P1^6;
sbit led2=P1^7;
sbit DIN=P3^4;
sbit CLK=P3^5;
sbit key1=P3^2;
sbit key2=P3^3;
unsigned char ah;
unsigned char al;
//端口声明----------------------------------------------
unsigned int i;
unsigned char code nbr[11]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x39}; //共阳数码管段码数据
void delay(unsigned z)
{
unsigned x,y;
for(x=z;x>0;x--)
for(y=300;y>0;y--);
}
//IIC协议start通讯开始函数-----------------------------------
void I2CStart()
{
DIN=1;
CLK=1;
delay(2);
DIN=1;
delay(2);
DIN=0;
delay(4);
CLK=0;
delay(2);
}
//IIC协议stop通讯结束函数-----------------------------------
void I2CStop()
{
CLK=1;
delay(2);
DIN=0;
delay(2);
DIN=1;
delay(2);
CLK=0;
DIN=0;
}
//发送8bit数据，从低位开始-----------------------------
void I2CWritebyte(unsigned char oneByte)
{
unsigned char i;
for(i=0;i<8;i++)
{
CLK=0;
if(oneByte&0x01)
DIN=1;
else
DIN=0;
delay(3);
CLK=1;
oneByte=oneByte>>1;
}
CLK=0;
delay(4);
DIN=0;
delay(2);
}
//TM1640写数据，再次封装，简化程序----------------------------
void tmw(int ha,hb)
{
I2CStart();
I2CWritebyte(ha); //地址命令设置：初始地址00H
for(i=0;i<1;i++) //发送16位显示数据
{
I2CWritebyte(hb); //显示值
}
I2CStop();
}
//TM1640开启显示便捷函数-------------------------------------
void tms()
{
I2CStart();
I2CWritebyte(0x8c); //显示控制：显示开，脉冲宽度设为11/16
I2CStop();
}
//adc中断-----------------------------------------------------
void ADC_Isr() interrupt 5
{
ADC_CONTR &= ~0x20; //清中断标志
ah = ADC_RES; //读取 ADC 结果
al = ADC_RESL; //读取 ADC 结果
delay(2);//必要的延时
ADC_CONTR |= 0x40; //继续 AD 转换
}
//adc采样函数-----------------------------------------------------
void ad()
{
unsigned int ab = 0;
int ac = 0;
float ad;
ab = ah*4+al;//两个寄存器（adc结果）合并
ad = ab*10000/1024*3.2;//计算电压（无小数点）
ac = ad;
tmw(0xc0,nbr[ac/1000%10]);//每一位依次显示在数码管上
delay(10);
tmw(0xc1,nbr[(ac/100)%10]);
delay(10);
tmw(0xc2,nbr[(ac/10)%10]);
delay(10);
tmw(0xc3,nbr[ac%10]);
delay(10);
tms();
delay(20);
}
//main函数-----------------------------------------------------
void main()
{
//uart_init();
P0M0 = 0x00; //配置io口寄存器为双向口
P0M1 = 0x01; //设置 P0.0 为 ADC 口
P1M0 = 0x00;
P1M1 = 0x00;
P2M0 = 0x00;
P2M1 = 0x00;
P3M0 = 0x00;
P3M1 = 0x00;
P4M0 = 0x00;
P4M1 = 0x00;
P5M0 = 0x00;
P5M1 = 0x00;
P_SW2 |= 0x80;
ADCTIM = 0x3f; //设置 ADC 内部时序
P_SW2 &= 0x7f;
ADCCFG = 0x0f; //设置 ADC 时钟为系统时钟/2/16/16
ADC_CONTR = 0x88; //使能 ADC 模块
EADC = 1; //使能 ADC 中断
EA = 1;
ADC_CONTR |= 0x40; //启动 AD 转换
led1 = 0;
while(1){
ad();
}
}

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