求pic16单片机产生spwm，c语言程序代码

void

delay(uchar

i)

{

uint

x,y

for(x=ix>0x--)

for(y=100y>0y--)

}

void

main()

{

uchar

pwm

=

1,h

=

20

while(1)

{

RC3

=1

delay(pwm)

RC3

=

0

delay(h

-

pwm)

}

}

改变pwm的值(1-19)，

就可以改变输凯中判出高盯改电平的宽度，还有其它的办法，这是培慧最简单的，软件延时

#include<pic.h>

#include<pic16f685.h>

#include<math.h>

//__CONFIG(0X002A)//配置字，禁止欠压复位BOR，16M外部晶振，上电延时使能，禁兄告稿止看门狗

__CONFIG(HS&PWRTEN&WDTEN)

//打开看门狗,选择高速晶振,上羡孝电延时复位,掉电复位使能,代码保护

float sin_am, sin_l,sin_d//浮点数,幅值变量,临时变量,临时变量

bit sin_up//友型sin函数正负半周标志

void intdelay()

void DELAY()

void init_start()

void CCP_start()

const unsigned char sina_[]={7 ,15 ,22 ,29 ,37 ,44 ,51 ,58 ,65 ,72 ,79 ,86 ,92 ,99 ,106 ,112 ,118

,124 ,130 ,136 ,141 ,147 ,152 ,157 ,162 ,166 ,171 ,175 ,179 ,183 ,186 ,190 ,193 ,196 ,198 ,201 ,203

,205 ,206 ,208 ,209 ,210 ,210 ,211 ,211 ,211 ,210 ,210 ,209 ,208 ,206 ,205 ,203 ,201 ,198 ,196 ,193

,190 ,186 ,183 ,179 ,175 ,171 ,166 ,162 ,157 ,152 ,147 ,141 ,136 ,130 ,124 ,118 ,112 ,106 ,99 ,92

,86 ,79 ,72 ,65 ,58 ,51 ,44 ,37 ,29 ,22 ,15 ,7 ,0

}

const unsigned char sinb_[]={7 ,15 ,22 ,29 ,37 ,44 ,51 ,58 ,65 ,72 ,79 ,86 ,92 ,99 ,106 ,112 ,118

,124 ,130 ,136 ,141 ,147 ,152 ,157 ,162 ,166 ,171 ,175 ,179 ,183 ,186 ,190 ,193 ,196 ,198 ,201 ,203

,205 ,206 ,208 ,209 ,210 ,210 ,211 ,211 ,211 ,210 ,210 ,209 ,208 ,206 ,205 ,203 ,201 ,198 ,196 ,193

,190 ,186 ,183 ,179 ,175 ,171 ,166 ,162 ,157 ,152 ,147 ,141 ,136 ,130 ,124 ,118 ,112 ,106 ,99 ,92

,86 ,79 ,72 ,65 ,58 ,51 ,44 ,37 ,29 ,22 ,15 ,7 ,0

}

//---------------------------------------------------------------------------------------

//const unsigned char sina_[]={4, 7, 11, 15, 18, 22, 26, 29, 33, 37, 40, 44, 47, 51,

// 55, 58, 62, 65, 69, 72, 76, 79, 82, 86, 89, 92, 96, 99,

// 102, 106, 109, 112, 115, 118, 121, 124, 127, 130,

// 133, 136, 138, 141, 144, 147, 149, 152, 154, 157,

// 159, 162, 164, 166, 169, 171, 173, 175, 177, 179,

//181, 183, 185, 186, 188, 190, 191, 193, 194, 196,

// 197, 198, 200, 201, 202, 203, 204, 205, 206, 206,

// 207, 208, 208, 209, 209, 210, 210, 210, 211, 211,

// 211, 211, 211, 211, 211, 210, 210, 210, 209, 209,

// 208, 208, 207, 206, 206, 205, 204, 203, 202, 201,

// 200, 198, 197, 196, 194, 193, 191, 190, 188, 186,

// 185, 183, 181, 179, 177, 175, 173, 171, 169, 166,

// 164, 162, 159, 157, 154, 152, 149, 147, 144, 141,

// 138, 136, 133, 130, 127, 124, 121, 118, 115, 112,

// 109, 106, 102, 99, 96, 92, 89, 86, 82, 79, 76, 72, 69, 65, 62, 58,

// 55, 51, 47, 44, 40, 37, 33, 29, 26, 22, 14, 7, 0, 7, 4, 0

//}

//----------------------------------------------------------------------------------

//const unsigned char sinb_[]={4, 7, 11, 15, 18, 22, 26, 29, 33, 37, 40, 44, 47, 51,

// 55, 58, 62, 65, 69, 72, 76, 79, 82, 86, 89, 92, 96, 99,

// 102, 106, 109, 112, 115, 118, 121, 124, 127, 130,

// 133, 136, 138, 141, 144, 147, 149, 152, 154, 157,

// 159, 162, 164, 166, 169, 171, 173, 175, 177, 179,

//181, 183, 185, 186, 188, 190, 191, 193, 194, 196,

// 197, 198, 200, 201, 202, 203, 204, 205, 206, 206,

// 207, 208, 208, 209, 209, 210, 210, 210, 211, 211,

// 211, 211, 211, 211, 211, 210, 210, 210, 209, 209,

// 208, 208, 207, 206, 206, 205, 204, 203, 202, 201,

// 200, 198, 197, 196, 194, 193, 191, 190, 188, 186,

// 185, 183, 181, 179, 177, 175, 173, 171, 169, 166,

// 164, 162, 159, 157, 154, 152, 149, 147, 144, 141,

// 138, 136, 133, 130, 127, 124, 121, 118, 115, 112,

// 109, 106, 102, 99, 96, 92, 89, 86, 82, 79, 76, 72, 69, 65, 62, 58,

// 55, 51, 47, 44, 40, 37, 33, 29, 26, 22, 14, 7, 0, 7, 4, 0

//}

//--------------------------------------------------------------------------------------

//const unsigned char sinb_[]=

// {219, 215, 211, 207, 204, 200, 196, 192, 188, 184,

// 180, 177, 173, 169, 165, 162, 158, 154, 150, 147,

// 143, 139, 136, 132, 129, 125, 122, 118, 115, 112,

// 108, 105, 102, 98, 95, 92, 89, 86, 83, 80, 77, 74, 71, 68, 65, 63,

// 60, 57, 55, 52, 50, 47, 45, 43, 40, 38, 36, 34, 32, 30, 28, 26, 24, 23, 21,

// 19, 18, 16, 15, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 3, 2, 2,

// 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 2, 2, 3, 3, 4,

// 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 18, 19, 21, 23, 24, 26, 28,

// 30, 32, 34, 36, 38, 40, 43, 45, 47, 50, 52, 55, 57, 60, 63, 65, 68, 71,

// 74, 77, 80, 83, 86, 89, 92, 95, 98, 102, 105, 108, 112, 115,

// 118, 122, 125, 129, 132, 136, 139, 143, 147,

// 150, 154, 158, 162, 165, 169, 173, 177, 180,

// 184, 188, 192, 196, 205, 215, 219, 223, 215,

// 219, 223

//}

unsigned char sin_num//SIN函数表查表变量

//===================================================================================

void main()

{

// CLRWDT()//清除看门狗

TRISB=0X00 //RB4RB5RB6RB7为输出

TRISC=0XCB //11011001设置RC0RC1RC3RC4RC6RC7为输入，其它为输出

PORTB=0X00

PORTC=0X00

//--------------------------------------

OPTION=0X42//使能PORTA上拉，RA2下降沿触发中断(上升:0X47)，内部时钟，预分频器分配给TIMER0，分频比为1:8

sin_up=0 //正负半周SIN函数

sin_num=0//脉宽周期调整计数器

PDC1=1 //死区延时0.5US

INTCON=0XE0//11100000：GIE开总中断,timer0使能，

TMR2IE=1

CCP1CON=0X8C //10001100

CCPR1L=0X00

PR2=0XDF //设置PWM的工作周期,16Mhz,PWM周期18khz

T2CON=0x04// 00100100打开TMR2,且使其后分频为比1:5，预分频比为1

GIE=1//开全局中断

while(1)

{

CLRWDT() //清除看门狗

PDC1=1

T2CON=0x04 // 00100100打开TMR2,且使其后分频为比1:5，预分频比为1,

TMR2IE=1 //打开定时器2中断使能

CCP1CON=0X8C//10001100

PR2=0XDF //设置PWM的工作周期,16Mhz,PWM周期18khz

// DELAY()

}

}

//----------------------------------------------------------

//软件延时子程序*/

voidDELAY()

{

unsigned int i

for(i=2000i>0i--)

}

//-------------中断服务程序------------------------------------

void interrupt int1(void)

{

if(TMR2IF&&TMR2IE)

{

TMR2IF=0

CLRWDT()

if(sin_num==88){sin_num=0sin_up=!sin_up}

if((sin_up==0)&&(sin_num==0)) //低频正半周

{

CCPR1L=0

CCP1CON=0

RC4=RC5=0

RB7=0

RB6=!RB6

}

if((sin_up==1)&&(sin_num==0))//低频负半周

{

CCPR1L=0

CCP1CON=0

RC4=RC5=0

RB6=0

RB7=!RB7

}

if(sin_up==0)

{

CCP1CON=0X8C

CCPR1L=sinb_[sin_num] //高频正半周

sin_num++

}

if(sin_up==1)

{

CCP1CON=0X8C

CCPR1L=sina_[sin_num] //高频负半周

sin_num++

}

}

}

[email protected] 能发给一份SPWM的程序吗

工作原理你可以看一下STC单片机的PCA相关章节，占空比由CCAP0L，CCAP0H，

CCAP1L，CCAP1H的值确定比如其值为255，那么占空比就液凯为0%，其誉衡值为128，庆埋做占空比就为50%，其值为0，占空比就为100%。

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