单片机DA转换实现正弦波

来源:wuq发布时间:2019-07-06

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使用的是查表法：

1.c文件：

#include "reg52.h"

#include

#define PCF8591 0x90

#define uint unsigned int

#define uchar unsigned char

#define arr_length 720 //正弦波数组长度

code unsigned char sin1[720]={0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x8a,0x8b,0x8c,0x8d,0x8e,

0x8f,0x90,0x91,0x92,0x94,0x95,0x96,0x97,0x98,0x99,0x9a,0x9b,0x9c,0x9d,0x9e,0xa0,0xa1,0xa2,0xa3,0xa4,

0xa5,0xa6,0xa7,0xa8,0xa9,0xaa,0xab,0xac,0xad,0xae,0xaf,0xb0,0xb2,0xb3,0xb4,0xb5,0xb6,0xb7,0xb8,0xb9,

0xba,0xbb,0xbc,0xbd,0xbe,0xbf,0xbf,0xc0,0xc1,0xc2,0xc3,0xc4,0xc5,0xc6,0xc7,0xc8,0xc9,0xca,0xcb,0xcc,

0xcd,0xcd,0xce,0xcf,0xd0,0xd1,0xd2,0xd3,0xd3,0xd4,0xd5,0xd6,0xd7,0xd8,0xd8,0xd9,0xda,0xdb,0xdc,0xdc,

0xdd,0xde,0xdf,0xdf,0xe0,0xe1,0xe2,0xe2,0xe3,0xe4,0xe4,0xe5,0xe6,0xe6,0xe7,0xe8,0xe8,0xe9,0xea,0xea,

0xeb,0xeb,0xec,0xed,0xed,0xee,0xee,0xef,0xef,0xf0,0xf1,0xf1,0xf2,0xf2,0xf3,0xf3,0xf4,0xf4,0xf4,0xf5,

0xf5,0xf6,0xf6,0xf7,0xf7,0xf7,0xf8,0xf8,0xf9,0xf9,0xf9,0xfa,0xfa,0xfa,0xfb,0xfb,0xfb,0xfb,0xfc,0xfc,

0xfc,0xfc,0xfd,0xfd,0xfd,0xfd,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xff,0xff,0xff,0xff,0xff,0xff,0xff,

0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,

0xff,0xff,0xff,0xfe,0xfe,0xfe,0xfe,0xfe,0xfe,0xfd,0xfd,0xfd,0xfd,0xfc,0xfc,0xfc,0xfc,0xfb,0xfb,

0xfb,0xfb,0xfa,0xfa,0xfa,0xf9,0xf9,0xf9,0xf8,0xf8,0xf7,0xf7,0xf7,0xf6,0xf6,0xf5,0xf5,0xf4,0xf4,

0xf4,0xf3,0xf3,0xf2,0xf2,0xf1,0xf1,0xf0,0xef,0xef,0xee,0xee,0xed,0xed,0xec,0xeb,0xeb,0xea,0xea,

0xe9,0xe8,0xe8,0xe7,0xe6,0xe6,0xe5,0xe4,0xe4,0xe3,0xe2,0xe2,0xe1,0xe0,0xdf,0xdf,0xde,0xdd,0xdc,

0xdc,0xdb,0xda,0xd9,0xd8,0xd8,0xd7,0xd6,0xd5,0xd4,0xd3,0xd3,0xd2,0xd1,0xd0,0xcf,0xce,0xcd,0xcd,

0xcc,0xcb,0xca,0xc9,0xc8,0xc7,0xc6,0xc5,0xc4,0xc3,0xc2,0xc1,0xc0,0xc0,0xbf,0xbe,0xbd,0xbc,0xbb,

0xba,0xb9,0xb8,0xb7,0xb6,0xb5,0xb4,0xb3,0xb2,0xb0,0xaf,0xae,0xad,0xac,0xab,0xaa,0xa9,0xa8,0xa7,

0xa6,0xa5,0xa4,0xa3,0xa2,0xa1,0xa0,0x9e,0x9d,0x9c,0x9b,0x9a,0x99,0x98,0x97,0x96,0x95,0x94,0x92,

0x91,0x90,0x8f,0x8e,0x8d,0x8c,0x8b,0x8a,0x88,0x87,0x86,0x85,0x84,0x83,0x82,0x81,0x80,0x7e,0x7d,

0x7c,0x7b,0x7a,0x79,0x78,0x77,0x75,0x74,0x73,0x72,0x71,0x70,0x6f,0x6e,0x6d,0x6b,0x6a,0x69,0x68,

0x67,0x66,0x65,0x64,0x63,0x62,0x61,0x5f,0x5e,0x5d,0x5c,0x5b,0x5a,0x59,0x58,0x57,0x56,0x55,0x54,

0x53,0x52,0x51,0x50,0x4f,0x4d,0x4c,0x4b,0x4a,0x49,0x48,0x47,0x46,0x45,0x44,0x43,0x42,0x41,0x40,

0x40,0x3f,0x3e,0x3d,0x3c,0x3b,0x3a,0x39,0x38,0x37,0x36,0x35,0x34,0x33,0x32,0x32,0x31,0x30,0x2f,

0x2e,0x2d,0x2c,0x2c,0x2b,0x2a,0x29,0x28,0x27,0x27,0x26,0x25,0x24,0x23,0x23,0x22,0x21,0x20,0x20,

0x1f,0x1e,0x1d,0x1d,0x1c,0x1b,0x1b,0x1a,0x19,0x19,0x18,0x17,0x17,0x16,0x15,0x15,0x14,0x14,0x13,

0x12,0x12,0x11,0x11,0x10,0x10,0xf,0xe,0xe,0xd,0xd,0xc,0xc,0xb,0xb,0xb,0xa,0xa,0x9,0x9,0x8,0x8,

0x8,0x7,0x7,0x6,0x6,0x6,0x5,0x5,0x5,0x4,0x4,0x4,0x4,0x3,0x3,0x3,0x3,0x2,0x2,0x2,0x2,0x1,0x1,0x1,

0x1,0x1,0x1,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,

0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x0,0x1,0x1,0x1,0x1,0x1,0x1,0x2,0x2,0x2,0x2,0x3,0x3,0x3,0x3,0x4,0x4,

0x4,0x4,0x5,0x5,0x5,0x6,0x6,0x6,0x7,0x7,0x8,0x8,0x8,0x9,0x9,0xa,0xa,0xb,0xb,0xb,0xc,0xc,0xd,0xd,

0xe,0xe,0xf,0x10,0x10,0x11,0x11,0x12,0x12,0x13,0x14,0x14,0x15,0x15,0x16,0x17,0x17,0x18,0x19,0x19,

0x1a,0x1b,0x1b,0x1c,0x1d,0x1d,0x1e,0x1f,0x20,0x20,0x21,0x22,0x23,0x23,0x24,0x25,0x26,0x27,0x27,

0x28,0x29,0x2a,0x2b,0x2c,0x2c,0x2d,0x2e,0x2f,0x30,0x31,0x32,0x32,0x33,0x34,0x35,0x36,0x37,0x38,

0x39,0x3a,0x3b,0x3c,0x3d,0x3e,0x3f,0x3f,0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47,0x48,0x49,0x4a,

0x4b,0x4c,0x4d,0x4f,0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,0x58,0x59,0x5a,0x5b,0x5c,0x5d,0x5e,

0x5f,0x61,0x62,0x63,0x64,0x65,0x66,0x67,0x68,0x69,0x6a,0x6b,0x6d,0x6e,0x6f,0x70,0x71,0x72,0x73,

0x74,0x75,0x77,0x78,0x79,0x7a,0x7b,0x7c,0x7d,0x7e};

uchar code sin2[256]={

0x80, 0x83, 0x86, 0x89, 0x8c, 0x8f, 0x92, 0x95,

0x98, 0x9c, 0x9f, 0xa2, 0xa5, 0xa8, 0xab, 0xae,

0xb0, 0xb3, 0xb6, 0xb9, 0xbc, 0xbf, 0xc1, 0xc4,

0xc7, 0xc9, 0xcc, 0xce, 0xd1, 0xd3, 0xd5, 0xd8,

0xda, 0xdc, 0xde, 0xe0, 0xe2, 0xe4, 0xe6, 0xe8,

0xea, 0xec, 0xed, 0xef, 0xf0, 0xf2, 0xf3, 0xf4,

0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfc,

0xfd, 0xfe, 0xfe, 0xff, 0xff, 0xff, 0xff, 0xff,

0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0xfe,

0xfd, 0xfc, 0xfc, 0xfb, 0xfa, 0xf9, 0xf8, 0xf7,

0xf6, 0xf5, 0xf3, 0xf2, 0xf0, 0xef, 0xed, 0xec,

0xea, 0xe8, 0xe6, 0xe4, 0xe3, 0xe1, 0xde, 0xdc,

0xda, 0xd8, 0xd6, 0xd3, 0xd1, 0xce, 0xcc, 0xc9,

0xc7, 0xc4, 0xc1, 0xbf, 0xbc, 0xb9, 0xb6, 0xb4,

0xb1, 0xae, 0xab, 0xa8, 0xa5, 0xa2, 0x9f, 0x9c,

0x99, 0x96, 0x92, 0x8f, 0x8c, 0x89, 0x86, 0x83,

0x80, 0x7d, 0x79, 0x76, 0x73, 0x70, 0x6d, 0x6a,

0x67, 0x64, 0x61, 0x5e, 0x5b, 0x58, 0x55, 0x52,

0x4f, 0x4c, 0x49, 0x46, 0x43, 0x41, 0x3e, 0x3b,

0x39, 0x36, 0x33, 0x31, 0x2e, 0x2c, 0x2a, 0x27,

0x25, 0x23, 0x21, 0x1f, 0x1d, 0x1b, 0x19, 0x17,

0x15, 0x14, 0x12, 0x10, 0x0f, 0x0d, 0x0c, 0x0b,

0x09, 0x08, 0x07, 0x06, 0x05, 0x04, 0x03, 0x03,

0x02, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,

0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01,

0x02, 0x03, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,

0x09, 0x0a, 0x0c, 0x0d, 0x0e, 0x10, 0x12, 0x13,

0x15, 0x17, 0x18, 0x1a, 0x1c, 0x1e, 0x20, 0x23,

0x25, 0x27, 0x29, 0x2c, 0x2e, 0x30, 0x33, 0x35,

0x38, 0x3b, 0x3d, 0x40, 0x43, 0x46, 0x48, 0x4b,

0x4e, 0x51, 0x54, 0x57, 0x5a, 0x5d, 0x60, 0x63,

0x66, 0x69, 0x6c, 0x6f, 0x73, 0x76, 0x79, 0x7c, };

sbit key1=P3^4;

sbit key2=P3^5;

uint speed=20; //正弦波变化速度

uint num=0;

uint time=0;

DACconversion(unsigned char sla,unsigned char c, unsigned char Val);

void Init_Timer1(void)//定时器一初始化程序

{

TMOD=0x01;

TH0=(65535-0)/256;

TL0=(65535-0)%256;

EA=1;//开总中断

ET0=1;//开定时器0中断

TR0=1; //启动定时器0

}

void delay(uchar s){

uchar i,j;

for(i=s;i>0;i--)

for(j=110;j>0;j--);

}

void change_Speed(){

if(key1==0){

delay(10);

if(key1==0){

speed++;

}

if(key2==0){

delay(10);

if(key2==0){

if(speed>1)

speed--;

}

void time0() interrupt 1{

TH0=(65535-0)/256;

TL0=(65535-0)%256;

change_Speed();

for(num=0;num

DACconversion(PCF8591,0x40,sin1[num]);

}

if(num==arr_length){

num=0;

}

void main()

{

Init_Timer1();

}

i2c.c文件

/*-----------------------------------------------

名称：IIC协议

修改：无

内容：函数是采用软件延时的方法产生SCL脉冲,固对高晶振频率要作一定的修改....(本例是1us机器

周期,即晶振频率要小于12MHZ)

------------------------------------------------*/

#include "i2c.h"

//#include "delay.h"

#define PCF8591 0x90

#define _Nop() _nop_() //定义空指令

bit ack; //应答标志位

sbit SDA=P2^0;

sbit SCL=P2^1;

/*------------------------------------------------

启动总线

------------------------------------------------*/

void Start_I2c()

{

SDA=1; //发送起始条件的数据信号

_Nop();

SCL=1;

_Nop(); //起始条件建立时间大于4.7us,延时

_Nop();

SDA=0; //发送起始信号

_Nop(); //起始条件锁定时间大于4μ

_Nop();

SCL=0; //钳住I2C总线，准备发送或接收数据

_Nop();

}

/*------------------------------------------------

结束总线

------------------------------------------------*/

void Stop_I2c()

{

SDA=0; //发送结束条件的数据信号

_Nop(); //发送结束条件的时钟信号

SCL=1; //结束条件建立时间大于4μ

_Nop();

SDA=1; //发送I2C总线结束信号

_Nop();

}

/*----------------------------------------------------------------

字节数据传送函数

函数原型: void SendByte(unsigned char c);

功能: 将数据c发送出去,可以是地址,也可以是数据,发完后等待应答,并对

此状态位进行操作.(不应答或非应答都使ack=0 假)

发送数据正常，ack=1; ack=0表示被控器无应答或损坏。

------------------------------------------------------------------*/

void SendByte(unsigned char c)

{

unsigned char BitCnt;

for(BitCnt=0;BitCnt<8;BitCnt++) //要传送的数据长度为8位

{

if((c<

else SDA=0;

_Nop();

SCL=1; //置时钟线为高，通知被控器开始接收数据位

_Nop();

_Nop(); //保证时钟高电平周期大于4μ

_Nop();

SCL=0;

}

_Nop();

SDA=1; //8位发送完后释放数据线，准备接收应答位

_Nop();

SCL=1;//控制线

_Nop();

if(SDA==1)ack=0;

else ack=1; //判断是否接收到应答信号

SCL=0;

_Nop();

}

/*******************************************************************

DAC变换,转化函数

*******************************************************************/

bit DACconversion(unsigned char sla,unsigned char c, unsigned char Val)

{

Start_I2c();//启动总线

SendByte(sla);//发送器件地址

if(ack==0)return(0);

SendByte(c);//发送控制字节

if(ack==0)return(0);

SendByte(Val);//发送DAC的数值

if(ack==0)return(0);

Stop_I2c();//结束总线

return(1);

}

/*----------------------------------------------------------------

字节数据传送函数

函数原型: unsigned char RcvByte();

功能: 用来接收从器件传来的数据,并判断总线错误(不发应答信号)，

发完后请用应答函数。

------------------------------------------------------------------*/

/*unsigned char RcvByte()

{

unsigned char retc;

unsigned char BitCnt;

retc=0;

SDA=1; //置数据线为输入方式

for(BitCnt=0;BitCnt<8;BitCnt++)

{

_Nop();

SCL=0; //置时钟线为低，准备接收数据位

_Nop();

_Nop(); //时钟低电平周期大于4.7us

_Nop();

SCL=1; //置时钟线为高使数据线上数据有效

_Nop();

retc=retc<<1;

if(SDA==1)retc=retc+1; //读数据位,接收的数据位放入retc中

_Nop();

}

SCL=0;

_Nop();

return(retc);

}

/*----------------------------------------------------------------

应答子函数

原型: void Ack_I2c(void);

----------------------------------------------------------------*/

/*void Ack_I2c(void)

{

SDA=0;

_Nop();

SCL=1;

_Nop();

_Nop(); //时钟低电平周期大于4μ

_Nop();

SCL=0; //清时钟线，钳住I2C总线以便继续接收

_Nop();

}*/

/*----------------------------------------------------------------

非应答子函数

原型: void NoAck_I2c(void);

----------------------------------------------------------------*/

/*void NoAck_I2c(void)

{

SDA=1;

_Nop();

SCL=1;

_Nop();

_Nop(); //时钟低电平周期大于4μ

_Nop();

SCL=0; //清时钟线，钳住I2C总线以便继续接收

_Nop();

}

/*----------------------------------------------------------------

向无子地址器件发送字节数据函数

函数原型: bit ISendByte(unsigned char sla,ucahr c);

功能: 从启动总线到发送地址，数据，结束总线的全过程,从器件地址sla.

如果返回1表示操作成功，否则操作有误。

注意：使用前必须已结束总线。

----------------------------------------------------------------*/

/*bit ISendByte(unsigned char sla,unsigned char c)

{

Start_I2c(); //启动总线

SendByte(sla); //发送器件地址

if(ack==0)return(0);

SendByte(c); //发送数据

if(ack==0)return(0);

Stop_I2c(); //结束总线

return(1);

}

/*----------------------------------------------------------------

向有子地址器件发送多字节数据函数

函数原型: bit ISendStr(unsigned char sla,unsigned char suba,ucahr *s,unsigned char no);

功能: 从启动总线到发送地址，子地址,数据，结束总线的全过程,从器件

地址sla，子地址suba，发送内容是s指向的内容，发送no个字节。

如果返回1表示操作成功，否则操作有误。

注意：使用前必须已结束总线。

----------------------------------------------------------------*/

/*bit ISendStr(unsigned char sla,unsigned char suba,unsigned char *s,unsigned char no)

{

unsigned char i;

for(i=0;i

{

Start_I2c(); //启动总线

SendByte(sla); //发送器件地址

if(ack==0)return(0);

SendByte(suba); //发送器件子地址

if(ack==0)return(0);

SendByte(*s); //发送数据

if(ack==0)return(0);

Stop_I2c(); //结束总线

DelayMs(1); //必须延时等待芯片内部自动处理数据完毕

s++;

suba++;

}

return(1);

}

/*----------------------------------------------------------------

向无子地址器件读字节数据函数

函数原型: bit IRcvByte(unsigned char sla,ucahr *c);

功能: 从启动总线到发送地址，读数据，结束总线的全过程,从器件地

址sla，返回值在c.

如果返回1表示操作成功，否则操作有误。

注意：使用前必须已结束总线。

----------------------------------------------------------------*/

/*bit IRcvByte(unsigned char sla,unsigned char *c)

{

Start_I2c(); //启动总线

SendByte(sla+1); //发送器件地址

if(ack==0)return(0);

*c=RcvByte(); //读取数据

NoAck_I2c(); //发送非就答位

Stop_I2c(); //结束总线

return(1);

}

/*----------------------------------------------------------------

向有子地址器件读取多字节数据函数

函数原型: bit ISendStr(unsigned char sla,unsigned char suba,ucahr *s,unsigned char no);

功能: 从启动总线到发送地址，子地址,读数据，结束总线的全过程,从器件

地址sla，子地址suba，读出的内容放入s指向的存储区，读no个字节。

如果返回1表示操作成功，否则操作有误。

注意：使用前必须已结束总线。

----------------------------------------------------------------*/

/*bit IRcvStr(unsigned char sla,unsigned char suba,unsigned char *s,unsigned char no)

{

unsigned char i;

Start_I2c(); //启动总线

SendByte(sla); //发送器件地址

if(ack==0)return(0);

SendByte(suba); //发送器件子地址

if(ack==0)return(0);

Start_I2c();

SendByte(sla+1);

if(ack==0)return(0);

for(i=0;i

{

*s=RcvByte(); //发送数据

Ack_I2c(); //发送就答位

s++;

}

*s=RcvByte();

NoAck_I2c(); //发送非应位

Stop_I2c(); //结束总线

return(1);

}

原理图：

效果：

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单片机DA转换实现正弦波

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