8051单片机关于AD和DA的使用

//#pragma SRC #include <stdio.h> #include <reg51.h> #define TRUE 1 #define FALSE 0 #define DELAY_VALUE 3 #define ATODHIGH 0x0700 //00000111 #define ATODLOW 0x0F00 //00001111 #define DTOAHIGH 0x1100 //00010001 #define DTOALOW 0x1200 //00010010 #define ADDARATE 1.1304 #define STEPLENGTH 3 #define PinLamp P1_0 //指示灯驱动管脚 #define PinSpeaker P1_1 //蜂鸣器驱动管脚 #define PinADStatus P1_2 //AD的状态显示 #define PinADCS P2_4 //AD的选中信号 #define XBYTE ((unsigned char volatile xdata*) 0) sbit P0_0=P0^0; sbit P0_1=P0^1; sbit P0_2=P0^2; sbit P0_3=P0^3; sbit P0_4=P0^4; sbit P0_5=P0^5; sbit P0_6=P0^6; sbit P0_7=P0^7; sbit P1_0=P1^0; sbit P1_1=P1^1; sbit P1_2=P1^2; sbit P1_3=P1^3; sbit P1_4=P1^4; sbit P1_5=P1^5; sbit P1_6=P1^6; sbit P1_7=P1^7; sbit P2_0=P2^0; sbit P2_1=P2^1; sbit P2_2=P2^2; sbit P2_3=P2^3; sbit P2_4=P2^4; sbit P2_5=P2^5; sbit P2_6=P2^6; sbit P2_7=P2^7; void initial(void); //初始化子程序 void delay(unsigned char i); void sendda(unsigned short ab); unsigned short getad(void); unsigned short serdate(void); void main(void) { unsigned short refint=0,aint=0; initial(); while(1) { refint=serdate(); aint=getad(); if(aint>=refint) { aint-=STEPLENGTH; } else if(aint<refint) { aint+=STEPLENGTH; } sendda(aint); } } void initial(void) { P1_0=TRUE; //发光二极管设为不亮 P1_1=TRUE; //蜂鸣器不叫 } void delay(unsigned char i) //延迟子程序 { short j=0; short k=0; k=i*DELAY_VALUE; while (j<k)j++; } void sendda(unsigned short ab) { XBYTE[DTOAHIGH]=(unsigned char)(ab/256); delay(DELAY_VALUE); XBYTE[DTOALOW]=ab-(unsigned short)((unsigned char)(ab/256)*256); delay(DELAY_VALUE); } unsigned short getad(void) { unsigned short ab; unsigned char tmp1,tmp2; PinADCS=TRUE; PinADStatus=TRUE; while(PinADStatus==TRUE); tmp1=XBYTE[ATODHIGH]; tmp2=XBYTE[ATODLOW]; ab=(unsigned short)tmp1*256+(unsigned short)tmp2; return ab; } unsigned short serdate(void) { unsigned short ab; unsigned char tmp1,tmp2; tmp1 = XBYTE[DTOAHIGH]; tmp2 = XBYTE[DTOALOW]; ab=(unsigned short)(((float)tmp1*256+(float)tmp2)*ADDARATE); return ab; }