c8051f020_AD转换程序

#include"c8051f020.h"
#include"math.h"
#include <intrins.h>
#define uchar unsigned char
#define uint unsigned int
#define jpan P1 //定义键盘
float DA_data; //DA数据
unsigned char Dkey;
void SysclkInit(void) //晶振初始化{
unsigned int i;
OSCXCN=0x67;
for(i=0;i<256;i++);
while(!(OSCXCN&0x80));
OSCICN=0x88;
}
void DACInit(void) //DAC的初始化{
REF0CN=0x03;
DAC0CN=0x80;
DAC1CN=0x80;
}
void delay1(int ms) //延时
{
while(ms--)
{
uchar i;
for(i=0;i<250;i++)
{
_nop_();
_nop_();
_nop_();
_nop_();
}
}
}
void keyscan(void) //键盘扫描
{
uchar temp,key;
jpan=0x0F; //低四位输入delay1(1);
temp=jpan; //读P3口
temp=temp&0x0F;
temp=~(temp|0xF0);
if(temp==1)
key=0;
else if(temp==2)
key=1;
else if(temp==4)
key=2;
else if(temp==8)
key=3;
else
key=16;
jpan=0xF0; //高四位输入
delay1(1);
temp=jpan; //读P3口
temp=temp&0xF0;
temp=~((temp>>4)|0xF0);
if(temp==1)
key=key+0;
else if(temp==2)
key=key+4;
else if(temp==4)
key=key+8;
else if(temp==8)
key=key+12;
else
key=16;
switch(key)
{
case 0 :key=2;break;
case 1 : key=1;break;
case 2 : key=12;break;
case 3 : key=3;break;
case 4 : key=13;break;
case 5 : key=0;break;
case 6 : key=15;break;
case 7 : key=14;break;
case 8 : key=8;break;
case 9 : key=7;break;
case 10 : key=10;break;
case 11 : key=9;break;
case 12 : key=5;break;
case 13 : key=4;break;
case 14 : key=11;break;
case 15 : key=6;break;
default: key=16;
}
if(key==7)
{
DA_data=DA_data+1000; }
if(key==8)
{
DA_data=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);
}
void keydown(void) //检测是否按下键盘
{
jpan=0xF0;
if(jpan!=0xF0)
{
delay1(60);
if(jpan!=0xf0)
{
keyscan();
Dkey=1;
}
delay1(60);
}
}
void main(void)
{
// float Date;
// float vc;
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)
{
Dkey=0;
DAC0L=(unsigned int ) DA_data;//低字节数据寄存器DAC0H=((unsigned int)DA_data)>>8;//高字节
DAC1L=(unsigned int ) DA_data;
DAC1H=((unsigned int)DA_data)>>8;
}
}
}。