DA转换源程序(lcd1602显示)

/***********************DA源程序*****************************************/#include<reg52.h>#include"lm1602.h"#include<intrins.h>sbit Key0 = P2^7;sbit Key1 = P2^0;sbit Key2 = P2^1;sbit Key3 = P2^2;sbit Key4 = P2^3;sbit OE = P3^6;bit flag = 0;unsigned char Square[]="Square Wave"; //方波unsigned char Triangular[]="Triangular Wave"; //三角波unsigned char Sawtooth[]="Sawtooth Wave"; //锯齿波unsigned char Sine[]="Sine Wave";unsigned char Frequency[]="Freq:";unsigned char Hz[]="Hz";unsigned char Cycle[]="25000";//unsigned char PWM[]="PWM:50%";unsigned int X = 0;unsigned char code sin[]={125,128,131,134,138,141,144,147,150,153,156,159, 162,165,168,171,174,177,180,182,185,188,191,193,196,198,201,203,206,208,211,213,215,217,219,221,223,225,227,229,231,232,234,235,237,238,239,241,242,243,244,245,246,246,247,248,248,249,249,250,250,250,250,250,250,250,250,249,249,248,248,247,246,246,245,244,243,242,241,239,238,237,235,234,232,231,229,227,225,223,221,219,217,215,213,211,208,206,203,201,198,196,193,191,188,185,182,180,177,174,171,168,165,162,159,156,153,150,147,144,141,138,134,131,128,125,122,119,116,112,109,106,103,100,97,94,91,88,85,82,79,76,73,70,68,65,62,59,57,54,52,49,47,44,42,39,37,35,33,31,29,27,25,27,29,27,25,23,21,19,18,16,15,13,12,11,9,8,7,6,5,4,4,3,2,2,1,1,0,0,0,0,0,0,0,0,1,1,2,2,3,4,4,5,6,7,8,9,11,12,13,15,16,18,19,21,23,25,27,29,31,33,35,37,39,42,44,47,49,52,54,57,59,62,65,68,70,73,76,79,82,85,88,97,94,97,100,103,106,109,112,116,119,122};void Delay(unsigned int num){unsigned int i;for(i=0;i<num;i++);}void SanJiao(unsigned char num){unsigned char dat =0;LCD_Write_String(0x80,Triangular);while(1){P1 = dat++;Delay(num);if(dat==0xff)flag = 1;if(Key0==0){Delay(5000);if(Key0==0)break;}while(flag){P1 = dat--;Delay(num);if(dat==0)flag = 0;if(Key0==0){Delay(5000);if(Key0==0)break;}}if(Key1==0){Delay(5000);if(Key1==0){num = num+5;X = num*500;Cycle[0] = X/10000+0x30;Cycle[1] = X%10000/1000+0x30;Cycle[2] = X%1000/100+0x30;Cycle[3] = X%100/10+0x30;Cycle[4] = X%10+0x30;LCD_Write_String(0xc5,Cycle);}}if(Key2==0){Delay(5000);if(Key2==0){num = num-5;X = num*500;Cycle[0] = X/10000+0x30;Cycle[1] = X%10000/1000+0x30;Cycle[2] = X%1000/100+0x30;Cycle[3] = X%100/10+0x30;Cycle[4] = X%10+0x30;LCD_Write_String(0xc5,Cycle);}}}}void JuChi(unsigned char num){unsigned char dat =0;LCD_Write_String(0x80,Sawtooth);while(1){P1 = dat++;if(dat==0xff)dat = 0;Delay(num);if(Key0==0){Delay(5000);if(Key0==0)break;}if(Key1==0){Delay(5000);if(Key1==0){num = num+5;X = num*255;Cycle[0] = X/10000+0x30;Cycle[1] = X%10000/1000+0x30;Cycle[2] = X%1000/100+0x30;Cycle[3] = X%100/10+0x30;Cycle[4] = X%10+0x30;LCD_Write_String(0xc5,Cycle);}}if(Key2==0){Delay(5000);if(Key2==0){num = num-5;X = num*255;Cycle[0] = X/10000+0x30;Cycle[1] = X%10000/1000+0x30;Cycle[2] = X%1000/100+0x30;Cycle[3] = X%100/10+0x30;Cycle[4] = X%10+0x30;LCD_Write_String(0xc5,Cycle);}}}}void ZhengXuan(unsigned char num){unsigned char i=0;LCD_Write_String(0x84,Sine);while(1){P1 = sin[i++];Delay(num);if(i==255)i=0;if(Key0==0){Delay(5000);if(Key0==0)break;}if(Key1==0){Delay(5000);if(Key1==0){num = num+5;X = num*255;Cycle[0] = X/10000+0x30;Cycle[1] = X%10000/1000+0x30;Cycle[2] = X%1000/100+0x30;Cycle[3] = X%100/10+0x30;Cycle[4] = X%10+0x30;LCD_Write_String(0xc5,Cycle);}}if(Key2==0){Delay(5000);if(Key2==0){num = num-5;X = num*255;Cycle[0] = X/10000+0x30;Cycle[1] = X%10000/1000+0x30;Cycle[2] = X%1000/100+0x30;Cycle[3] = X%100/10+0x30;Cycle[4] = X%10+0x30;LCD_Write_String(0xc5,Cycle);}}}}void FangBo(unsigned int num){unsigned char dat=0xff;LCD_Write_String(0x80,Square);while(1){P1 = dat;Delay(num);P1 = ~dat;Delay(num);if(Key0==0){Delay(1000);if(Key0==0);break;}if(Key1==0){Delay(5000);if(Key1==0){num = num+3000;X = num;Cycle[0] = X/10000+0x30;Cycle[1] = X%10000/1000+0x30;Cycle[2] = X%1000/100+0x30;Cycle[3] = X%100/10+0x30;Cycle[4] = X%10+0x30;LCD_Write_String(0xc5,Cycle);}}if(Key2==0){Delay(5000);if(Key2==0){num = num-3000;X = num;Cycle[0] = X/10000+0x30;Cycle[1] = X%10000/1000+0x30;Cycle[2] = X%1000/100+0x30;Cycle[3] = X%100/10+0x30;Cycle[4] = X%10+0x30;LCD_Write_String(0xc5,Cycle);}}}}void main(void){unsigned char i=0;LCD_Init();LCD_Write_String(0xc0,Frequency);LCD_Write_String(0xca,Hz);OE = 0;while(1){if(Key1==0)SanJiao(2);if(Key4==0)JuChi(2);if(Key3==0)ZhengXuan(2);if(Key2==0)FangBo(30000);}}/*******************************************************1602.c文件************/ #include"lm1602.h"void delay_us(unsigned int num){unsigned int i;for(i=0;i<num;i++);}void write_cmd(unsigned char dd){c_rs=0;c_rw=0;c_e=0;delay_us(50);P0=dd;c_e=1;delay_us(50);c_e=0;delay_us(50);}void write_dat(unsigned char dd){c_rs=1;c_rw=0;c_e=0;delay_us(50);P0=dd;c_e=1;delay_us(50);c_e=0;delay_us(50);}void LCD_Init( ){delay_us(200);write_cmd(0x38);delay_us(200);write_cmd(0x38);delay_us(200);write_cmd(0x38);delay_us(200);write_cmd(0x08);delay_us(200);write_cmd(0x01);delay_us(200);write_cmd(0x06);delay_us(200);write_cmd(0x0c);}void LCD_Write_String(unsigned char x,unsigned char *s){write_cmd(x);while (*s){write_dat(*s);s++;}}void LCD_Write_Char(unsigned char x,unsigned char Data){write_cmd(x);write_dat(Data);}/************************lcd.h封装模块********************************/ #ifndef __LM1602_H__#define __LM1602_H__#include<reg52.h>#include<intrins.h>sbit c_rs = P2^4;sbit c_rw = P2^5;sbit c_e = P2^6;void LCD_Write_Char(unsigned char x,unsigned char Data); void LCD_Write_String(unsigned char x,unsigned char *s); void LCD_Init(void);#endif仿真图。

实现AD采样，使⽤LCD1602显⽰AD数值实现 AD 采样，使⽤ LCD1602 显⽰ AD 数值写在前⾯单⽚机内集成的A/D转换，⼀般都有相应的特殊功能寄存器来设置A/D的使能标志，参考电压，转换频率，通道选择，A/D输⼊⼝的属性(模拟量输⼊还是普通的I/O⼝)，启动，停⽌控制等。

有了这些寄存器，使得我们控制单⽚机的模拟量采集变得⾮常⽅便。

A/D转换的基本原理是：将参考电平按最⼤的转换值量化，再利⽤输⼊模拟电平与参考电平的⽐例来求得输⼊电平的测量值(V测=V参*(AD量化值/AD转换的最⼤值))。

有些MCU A/D转换的参考电平可以选择由⼀个外部引脚输⼊，这样使得⽤户可以对A/D转换进⾏更好的控制。

值得注意的⼀点就是A/D转换的输⼊电平必须⽐参考电平低或相等，不然测试的结果就会有很⼤的偏差。

要求将电位器的输出电压进⾏AD转换，然后把转换的结果在1602上进⾏展⽰。

源码#include "reg52.h"//此⽂件中定义了单⽚机的⼀些特殊功能寄存器#include "lcd.h"#include"XPT2046.h"typedef unsigned int u16; //对数据类型进⾏声明定义typedef unsigned char u8;u8 disp[4];u8 code smgduan[10]={0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39,0x3A};/******************************************************************************** 函数名 : delay* 函数功能 : 延时函数，i=1时，⼤约延时10us*******************************************************************************/void delay(u16 i){while(i--);}/******************************************************************************** 函数名 :datapros()* 函数功能 :数据处理函数* 输⼊ : ⽆* 输出 : ⽆*******************************************************************************/void datapros(){u16 temp;static u8 i;if(i==50){i=0;temp = Read_AD_Data(0x94); // AIN0 电位器}i++;disp[0]=smgduan[temp/1000];//千位disp[1]=smgduan[temp%1000/100];//百位disp[2]=smgduan[temp%1000%100/10];//个位disp[3]=smgduan[temp%1000%100%10];}/******************************************************************************** 函数名 : main* 函数功能 : 主函数* 输⼊ : ⽆* 输出 : ⽆*******************************************************************************/void main(void){u8 i;while(1){datapros(); //数据处理函数 LcdInit();for(i=0;i<4;i++){LcdWriteData(disp[i]); }delay(100);}}效果。

本电路是先进行AD转换，得到数据后送入1602，再将数据进行DA转换，输出模拟电压。

本电路采用芯片是89C51 ，ADC0804和DAC0832。

电路和程序如下，希望能帮助大家学习———郭功晓。

#include<reg51.h> //包含单片机寄存器的头文件#include<intrins.h> //包含_nop_()函数定义的头文件#define uchar unsigned char#define uint unsigned intunsigned char code digit[11]={"0123456789-"};sbit RS=P3^0; //寄存器选择位，将RS位定义为P2.0引脚sbit RW=P3^1; //读写选择位，将RW位定义为P2.1引脚sbit E=P3^2; //使能信号位，将E位定义为P2.2引脚sbit BF=P0^7; //忙碌标志位，，将BF位定义为P0.7引脚sbit adwr=P3^6;sbit adrd=P3^7;sbit cs1=P3^4;sbit wr1=P3^5;unsigned char code string[ ]= {"voltage:"};unsigned char code string1[ ]={"V"};unsigned char code string2[ ]={"."};unsigned char code User[]={0x10,0x06,0x09,0x08,0x08,0x09,0x06,0x00};//自定义字符℃*//*****************************************************函数功能：延时1ms***************************************************/void delay1ms(){unsigned char i,j;for(i=0;i<10;i++)for(j=0;j<33;j++);}/*****************************************************函数功能：延时若干毫秒入口参数：n***************************************************/void delay(unsigned int n){unsigned int i;for(i=0;i<n;i++)delay1ms();}/*****************************************************函数功能：判断液晶模块的忙碌状态返回值：result。

/*我写的51AD转换程序，LED灯显示，随着外部电压升高，亮的小灯数会逐渐增加*/ #include<STC12C5A60S2.H>//包含单片机寄存器的头文件#include<intrins.h> //包含_nop_()函数定义的头文件unsigned char result;//A/D 转换结果变量void main(void){unsigned long i;unsigned char status;ADC_CONTR|=0x80;//开A/D 转换电源,第一次使用时要打开内部模拟电源for (i=0;i<10000;i++);//适当延时P1ASF=0x04;//选择P1.2 作为A/D 转换通道ADC_CONTR=0xE2;for (i=0;i<10000;i++);//适当延时while(1) //循环进行A/D转换{ADC_CONTR|=0x08;//启动A/D 转换status=0;while(status==0) //等待A/D 转换结束{status=ADC_CONTR&0x10;}ADC_CONTR&=0xE7;//将ADC_FLAG 清0result=ADC_RES; //保存A/D转换结果if(result<32)P0=0xff;else if(result<64)P0=0xfe;else if(result<96)P0=0xfc;else if(result<128)P0=0xf8;else if(result<160)P0=0xf0;else if(result<192)P0=0xe0;else if(result<214)P0=0xc0;else if(result<236)P0=0x80;elseP0=0x00;}}/*---------------------------------------------------------------------------------------------------------------------------*/ /*--************************功能【AD 转换，液晶显示】**************************--*//*--************************芯片：【STC12C5A60S2】******************************--*//*--************************液晶：【LCD1602】***********************************--*//*--************************ADC管脚：【P1.0～P1.7】***************************--*//*--************************检测范围：【0.00～4.99V】***************************--*//*---------------------------------------------------------------------------------------------------------------------------*/ #include"reg52.h"#include"intrins.h"typedef unsigned char uchar;typedef unsigned int uint;#define _Nop() _nop_()/*------------------------以下为LCD1602显示模块定义-----------------------*/unsigned char data_char_table[]={"0123456789ABCDEF"}; //LCD 数据unsigned char Lcd_Dis1_table[]= {"Position:No. "}; //第一行显示框架unsigned char pos_char_table[]= {" D "}; //显示位置unsigned char Lcd_Dis2_table[]= {"Voltage: V"}; //第二行显示框架unsigned char num_char_table[]= {" 9A.CD V"}; //显示位置sbit lcd_rs_port=P2^7; //定义LCD 控制端口,根据硬件调整sbit lcd_rw_port=P2^6;sbit lcd_en_port=P2^4;#define lcd_data_port P0void lcd_delay(uchar ms);//LCD1602延时void lcd_busy_wait(); //LCD1602忙等待void lcd_command_write(uint command); //LCD1602命令字写入void lcd_system_reset(); //LCD1602初始化voidlcd_char_write(uint x_pos,y_pos,lcd_dat); //LCD1602字符写入voidlcd_bad_check(); //LCD1602坏点检查void Num_to_Disp(uchar i, uint Num); //显示数据处理void LcdDisp(uchar j,uint num); //液晶显示函数/*------------------------以下为ADC 相应寄存器初始化及端口定义-------------*//***** 定义与ADC 相关的特殊功能寄存器*****/sfr ADC_CONTR = 0xBC; //ADC 控制寄存器sfr ADC_RES = 0xBD; //ADC hight8-bit result register sfr ADC_RESL = 0xBE; //ADC low2-bit result registersfr P1ASF = 0x9D; //P1 口功能控制寄存器P1ASF/************定义相应操作位***************/#define ADC_POWER0x80//ADC 电源控制位，0：关闭，1：打开#define ADC_FLAG 0x10//ADC 结束标志位#define ADC_START0x08 //ADC 启动控制位#define ADC_SPEEDLL 0x00 //540clocks___________选择转换速度/*------------------------以下为相关函数声明------------------------------*/void InitADC();uuuu GetADCResult(uchar ch);vvvv Delay(uint n);void delay_1ms(uchar x);/*-------------------------------- 主函数--------------------------------*/ void main(){//ADC 初始化//延时程序uchar i;lcd_system_reset(); //LCD1602 初始化lcd_bad_check(); //LCD1602 坏点检查InitADC(); //初始化ADC 特殊功能寄存器while(1){i = 0;while(i < 7){LcdDisp(i, GetADCResult(i)); //液晶1602 显示输入电压值（P1.0 -P1.7）Delay(1000);i++;}}}/*-------------------------------- ADC 取值------------------------------*/uint GetADCResult(uchar ch){ADC_CONTR= ADC_POWER | ADC_SPEEDLL | ch | ADC_START;_nop_(); //Must wait before inquiry_nop_();_nop_();_nop_();while(!(ADC_CONTR & ADC_FLAG)); //Wait complete flagADC_CONTR&=ADC_FLAG;//Close ADCreturn (ADC_RES*4+ ADC_RESL); //Return ADC result}/*---------------------------- 初始化ADC 特殊功能寄存器-------------------*/void InitADC(){P1ASF=P1|0x3f;//Set P1.0 - P1.5 as analog input portADC_RES = 0; //Clear previous resultADC_RESL =0;ADC_CONTR= ADC_POWER | ADC_SPEEDLL ;Delay(20); //ADC power-on delay and Start A/D conversion}/*---------------------------- LCD1602相应函数---------------------------*////////////////以下为LCD 显示数据处理/////////////////void Num_to_Disp(uchar i, uint Num){float NUM;int xx,yy,zz;NUM=(Num*5/1024.0); //计算公式：10-bit A/D Conversion Result = 1024x(Vin/Vcc) xx = (int)NUM;yy= (int)((NUM-(float)(xx)) * 10);zz= (int)((NUM-(float)(xx)) * 100)%10;num_char_table[9] = data_char_table[xx/ 10]; //电压值十位num_char_table[10]=data_char_table[xx% 10]; //电压值个位num_char_table[12]=data_char_table[yy]; //电压值小数点后一位num_char_table[13]=data_char_table[zz]; //电压值小数点后两位?pos_char_table[13]=data_char_table[i]; //当前ADC接口}//////////////////以下为LCD 显示////////////////////void LcdDisp(uchar j,uint num){uint i=0;for (i=0;i<16;i++){lcd_char_write(i,0,Lcd_Dis1_table[i]);lcd_char_write(i,1,Lcd_Dis2_table[i]); //显示框架}Num_to_Disp(j,num);lcd_char_write(13,0,pos_char_table[13]);for(i =9;i<14;i++){lcd_char_write(i,1,num_char_table[i]); //显示电压}delay_1ms(100);}//////////////以下是LCD1602驱动程序////////////////void lcd_delay(uchar ms)/*LCD1602 延时*/{uchar j;while(ms--){for(j=0;j<250;j++){;}}}void lcd_busy_wait()/*LCD1602忙等待*/{lcd_rs_port=0;lcd_rw_port=1;lcd_en_port=1;lcd_data_port=0xff;while(lcd_data_port&0x80);lcd_en_port=0;}void lcd_command_write(uint command) /*LCD1602命令字写入*/ {lcd_busy_wait();lcd_rs_port=0;lcd_rw_port=0;lcd_en_port=0;lcd_data_port= command;lcd_en_port=1;lcd_en_port=0;}void lcd_system_reset()/*LCD1602 初始化*/{lcd_delay(20);lcd_command_write(0x38);lcd_delay(100);lcd_command_write(0x38);lcd_delay(50);lcd_command_write(0x38);lcd_delay(10);lcd_command_write(0x08);lcd_command_write(0x01);lcd_command_write(0x06);lcd_command_write(0x0c);}void lcd_char_write(uint x_pos,y_pos,lcd_dat) /*LCD1602 字符写入*/ {x_pos &= 0x0f;/*X 位置范围0~15*/y_pos &= 0x01;/*Y 位置范围0~1*/if(y_pos==1)x_pos+=0x40;x_pos += 0x80;lcd_command_write(x_pos);lcd_busy_wait();lcd_rs_port=1;lcd_rw_port=0;lcd_en_port=0;lcd_data_port=lcd_dat;lcd_en_port=1;lcd_en_port=0;}void lcd_bad_check()/*LCD1602坏点检查*/{char i,j;for(i=0;i<2;i++){for(j=0;j<16;j++){lcd_char_write(j,i,0xff);}}lcd_delay(200);lcd_delay(200);lcd_delay(200);lcd_delay(100);lcd_delay(200);lcd_command_write(0x01);/* clear lcd disp */}//////////////////以上是LCD1602驱动程序/////////////////*-----------------------------void Delay(uint n){uint x;while(n--){}延时程序x = 500;while(x--);---------------------------*/}/*1MS 为单位的延时程序*/ void delay_1ms(uchar x){uchar j;while(x--){for(j=0;j<125;j++){;}}}。