c8051f020_AD转换程序.doc

#includec8051f020.h#includemath.h#include #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;i256;i+);while(!(OSCXCN&0x80);OSCICN=0x88;void DACInit(void) /DAC的初始化REF0CN=0x03;DAC0CN=0x80;（启动方式）DAC1CN=0x80; void delay1(int ms)/延时 while(ms-) uchar i; for(i=0;i4)|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