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研发客服1 实验现象（每间隔1s自动切换模拟信号采集通道，通过数码管显示测量的电压值）
2 硬件设计
3 程序设计
3.1 主函数
#include
#include "DisplaySmg.h"
#include "ADC0809.h"
#include "Timer0.h"
unsigned char adc_result = 0; //ADC转换后直接采集的数据
int adc_result_show = 0; //线性标度变化
unsigned char adc_flag = 1; //1s时间的标志信号，用来自动切换通道
unsigned char channel = 0; //通道号0~7
void disp_num(void) //显示四位十进制数
{
LedBuf[0]= channel; //通道号
LedBuf[1]= adc_result_show/100; //百位
LedBuf[2]= adc_result_show/10%10; //十位
LedBuf[3]= adc_result_show%10; //个位
}
void main()
{
Timer0_Init(); //定时/计数器T0初始化
EA=1; //中断总开关
DotDig1=1; //点亮第二个数码管的小数点
while(1)
{
if(adc_flag==1) //1S时间标志信号
{
adc_flag = 0; //清零,使用Timer0计时
adc_result = ADC_Conv(channel); //通过ADC采集通道channel输入端数据
adc_result_show = adc_result*1.0*100*5/255; //数据变换处理(线性标度变换)
disp_num(); //显示数据
channel++; //切换下一个通道
if(channel>7) channel = 0;
}
}
}
//1ms定时，动态刷新数码管，同时每隔1000ms刷新adc_flag=1
void Timer0_ISR(void) interrupt 1
{
static unsigned int timer0cnt;
TR0=0; //关闭定时器
timer0cnt++;
if(timer0cnt>=1000)
{
timer0cnt = 0;
adc_flag = 1;
}
DisplaySmg(); //每过1ms,刷新一次数码管显示函数
TL0 = 0x66; //设置定时初始值,定时1ms
TH0 = 0xFC; //设置定时初始值,定时1ms
TR0=1; //打开定时器
}
3.2 ADC0809模数转换函数
#ifndef __ADC0809_H__
#define __ADC0809_H__
#include
#define ADC_DATA P3
sbit ADDR_A = P1^0;
sbit ADDR_B = P1^1;
sbit ADDR_C = P1^2;
sbit START = P1^4;
sbit EOC = P1^5;
sbit OE = P1^6;
unsigned char ADC_Conv(unsigned char channel);
#endif
#include "ADC0809.h"
void ADC_SetChannel(channel)
{
switch(channel)
{
case 0: ADDR_A = 0; ADDR_B = 0; ADDR_C = 0; break;
case 1: ADDR_A = 1; ADDR_B = 0; ADDR_C = 0; break;
case 2: ADDR_A = 0; ADDR_B = 1; ADDR_C = 0; break;
case 3: ADDR_A = 1; ADDR_B = 1; ADDR_C = 0; break;
case 4: ADDR_A = 0; ADDR_B = 0; ADDR_C = 1; break;
case 5: ADDR_A = 1; ADDR_B = 0; ADDR_C = 1; break;
case 6: ADDR_A = 0; ADDR_B = 1; ADDR_C = 1; break;
case 7: ADDR_A = 1; ADDR_B = 1; ADDR_C = 1; break;
default: break;
}
}
unsigned char ADC_Conv(unsigned char channel)
{
unsigned char adc_result;
OE = 0; //数据输出允许信号，高电平有效
START = 0; //ADC转换启动信号，高电平有效, 电路中与ALE(地址锁存允许信号)连在一起
ADC_SetChannel(channel); //选通道
START = 1; //上升沿，同时将ADC内部的寄存器清零
START = 0; //产生一定的脉冲，Typ=100ns,下降沿启动AD转换
while(EOC==0); //查询方式，ADC转换结束信号，EOC=1，转换结束
// DelayXms(1); //延时等待方式
OE = 1; //数据更新到输出端口
adc_result = ADC_DATA; //单片机读取数据
OE = 0; //本次过程结束
return adc_result;
}
3.3 数码管动态显示函数
#ifndef __DisplaySmg_H__
#define __DisplaySmg_H__
#include
#define GPIO_SEG P0 //段选端
#define GPIO_SEL P2 //位选端
extern unsigned char LedBuf[]; //外部变量声明
extern unsigned char DotDig0,DotDig1,DotDig2,DotDig3;
void DisplaySmg(void);
#endif
#include "DisplaySmg.h"
unsigned char code LedData[]={ //共阴型数码管的段码表，字符，序号
0x3F, //"0"，0
0x06, //"1"，1
0x5B, //"2"，2
0x4F, //"3"，3
0x66, //"4"，4
0x6D, //"5"，5
0x7D, //"6"，6
0x07, //"7"，7
0x7F, //"8"，8
0x6F, //"9"，9
0x77, //"A"，10
0x7C, //"B"，11
0x39, //"C"，12
0x5E, //"D"，13
0x79, //"E"，14
0x71, //"F"，15
0x76, //"H"，16
0x38, //"L"，17
0x37, //"n"，18
0x3E, //"u"，19
0x73, //"P"，20
0x5C, //"o"，21
0x40, //"-"，22
0x00, //熄灭 23
};
unsigned char DotDig0=0,DotDig1=0,DotDig2=0,DotDig3=0; //小数点控制位
unsigned char code LedAddr[]={0xfe,0xfd,0xfb,0xf7}; //数码管位选
unsigned char LedBuf[]={22,22,22,22}; //显示缓存区
void DisplaySmg() //四位数码管，考虑小数点
{
unsigned char i; //等价于 "static unsigned char i = 0;"
unsigned char temp;
switch(i)
{
case 0:
{
GPIO_SEG = 0x00; //消影
if(DotDig0==1) //小数点
{
temp = LedData[LedBuf[0]] | 0x80; //点亮小数点
}
else
{
temp = LedData[LedBuf[0]];
}
GPIO_SEG = temp; //段码
GPIO_SEL = LedAddr[0]; //位选
i++;
break;
}
case 1:
GPIO_SEG = 0x00;
if(DotDig1==1) //小数点
{
temp = LedData[LedBuf[1]] | 0x80;
}
else
{
temp = LedData[LedBuf[1]];
}
GPIO_SEG = temp;
GPIO_SEL = LedAddr[1];
i++;
break;
case 2: