51单片机AD转换程序

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1、C8051F系列SOC单片机原理及应用基于51单片机的DA转换程序姓名：高阳学号：S1406046流水号：20140589该DA转换程序目的在于通过扫描键盘的输入讲数字信号转化为模拟信号，包括初始化、延时、扫描键盘输入等模块。#include"c8051f020.h"#include"math.h"#include#defineucharunsignedchar#defineuintunsignedint#definejpanP1//定义键盘floatDA_data;//DA数据unsignedch

2、arDkey;//晶振初始化voidSysclkInit(void){unsignedinti;OSCXCN=0x67;for(i=0;i<256;i++);while(!(OSCXCN&0x80));OSCICN=0x88;}//DAC的初始化voidDACInit(void){REF0CN=0x03;DAC0CN=0x80;（启动方式）DAC1CN=0x80;}//延时voiddelay1(intms){while(ms--){uchari;for(i=0;i<250;i++){_nop_();_nop_();_no

3、p_();_nop_();}}}//键盘扫描voidkeyscan(void){uchartemp,key;jpan=0x0F;//低四位输入delay1(1);temp=jpan;//读P3口temp=temp&0x0F;temp=~(temp

4、0xF0);if(temp==1)key=0;elseif(temp==2)key=1;elseif(temp==4)key=2;elseif(temp==8)key=3;elsekey=16;jpan=0xF0;//高四位输入delay1(1);temp=jpan;//读P3

5、口temp=temp&0xF0;temp=~((temp>>4)

6、0xF0);if(temp==1)key=key+0;elseif(temp==2)key=key+4;elseif(temp==4)key=key+8;elseif(temp==8)key=key+12;elsekey=16;switch(key){case0:key=2;break;case1:key=1;break;case2:key=12;break;case3:key=3;break;case4:key=13;break;case5:key=0;

7、break;case6:key=15;break;case7:key=14;break;case8:key=8;break;case9:key=7;break;case10:key=10;break;case11:key=9;break;case12:key=5;break;case13:key=4;break;case14:key=11;break;case15:key=6;break;default:key=16;}if(key==7){DA_data=DA_data+1000;}if(key==8){DA_data

8、=DA_data+100;}if(key==9){DA_data=DA_data+10;}if(key==10){DA_data=DA_data+1;}if(key==4){DA_data=DA_data-1000;}if(key==5){DA_data=DA_data-100;}if(key==6){DA_data=DA_data-10;}if(key==11){DA_data=DA_data-1;}jpan=0x0f;while(jpan!=0x0f);}//检测是否按下键盘voidkeydown(void){jpa

9、n=0xF0;if(jpan!=0xF0){delay1(60);if(jpan!=0xf0){keyscan();Dkey=1;}delay1(60);}}//主程序voidmain(void){//floatDate;//floatvc;WDTCN=0xde;WDTCN=0xad;//禁止看门狗定时P1MDOUT=0xff;//P1口推挽XBR2=0x40;//使能交叉开关SysclkInit();//晶振初始化DACInit();//DAC初始化while(1){keydown();//键盘检测if(Dkey){D

10、key=0;DAC0L=(unsignedint)DA_data;//低字节数据寄存器DAC0H=((unsignedint)DA_data)>>8;//高字节DAC1L=(unsignedint)DA_data;DAC1H=((unsignedint)DA_data)>>8;}}}