pic16f877a的AD实验学习

一、主函数

 //采集AD值

 #include <pic.h>
 #include "ad.h"
 #include "usart.h"

 __CONFIG(0xFF32);

 const uchar disp[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,
                         0x07,0x7f,0x6f};

 //延时函数
 void delayms(uint x)
 {
     uint j,k;
     for(j=x;j>0;j--)
      for(k=110;k>0;k--);
 }

 //显示4位，低位数码管显示不正常
 void display(uint x)
 {
     PORTD= disp[x/1000]|0x80;
     PORTA= 0x10;
     delayms(2);

        PORTD= disp[x/100%10];
       PORTA= 0x08;
     delayms(4);

        PORTD= disp[x/10%10];
        PORTA= 0x04;
     delayms(2);

        PORTD= disp[x%10];
        PORTA= 0x02;
     delayms(2);
 }



 //初始化IO
 void init()
 {
     TRISA = 0x01;            //RA0 input mode
     TRISC = 0xff;                //RC output mode
     TRISD = 0;
     PORTC = 0x01;

     ADCON0 = 0x41;            //ADCS1:ADCS0=01,AN0,,A/D On
     ADCON1 = 0x8E;            //right justified,ADCS2=0,1110
     delayms(10);
 }

 //获取AD值
 uint getad()
 {
     uint adval;
     float advalf;
     GO = 1;
     while(GO);
     adval = ADRESH;
     adval = adval<<8|ADRESL;
     advalf = adval/1023.0*5.0;                //转换成电压
     adval = (uint)(advalf*1000);            //转换成4位整型
     return (adval);
 }

 void main()
 {
     uint i = 0;
     uint temp;
     init();
     usart_init();
     while(1)
     {
         temp = getad();
         display(temp);
         if(i == 100)
         {
             usart_tx(temp>>8);
             usart_tx(temp);
             i=0;
         }
         delayms(5);
         i++;
     }
 }

二、usart函数

 #include <pic.h>
 #include "usart.h"

 //串口初始化
 void usart_init(void)
 {
     SPBRG = 0xC;                //波特率19200
     TXSTA = 0x24;                //开启发送，高速模式
     RCSTA = 0X90;                //使能TXRX引脚，接收到CREN直到被清零
     RCIE = 0X1;                    //使能接受中断
     GIE = 0X1;                    //开启总中断
     PEIE = 0X1;                    //开启串口中断
 }

 void interrupt usart(void)
 {
     if(RCIE && RCIF)
     {
         TXREG = RCREG;            //返回接收的数据
     }
 }

 void usart_tx(unsigned char date)
 {
     TXREG = date;
     while(TRMT!=1);
 }

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