sTc8 pwm调光程序怎么写?

下面这个程序是应用在stc上的pwm程序，测试成功

#includesfr CCON =0xD8 //PCA control register

sfr CMOD =0xD9

sfr CL =0xe9

sfr CH =0xF9

sfr CCAP0L=0xea

sfr CCAP1L=0xeb

sfr CCAP0H=0xfa

sfr CCAP1H=0xfb

sfr CCAPM0=0xda

sfr CCAPM1=0xdb

sbit CR=0xde//位寻址

void main(void)

{

CMOD=0x02 //使用系统时钟，时钟输入源频率fosc/2。PWM频率=fosc/2/256

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

7 6 5 4 3 21 0

CIDL- - - cps2CPS1 CPS0 ECF

CIDL: =0时，空闲模式下PCA计数器继续工作；=1时，空闲模式下PCA计数器停止工作。

CPS2,CPS1,CPS0:PCA计数脉冲选择。010,定时器0的溢出，可以实现可调频率的PWM输出。

ECF: =1时，使能寄存器CCON CF位的中断；=0时，禁止该功能。

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

CL=0x00

CH=0x00

CCAP0L=0xc0//当CL小于CCAP0L时，输出为低大于时，输出为高。

CCAP0H=0x7f//当CL由ff变为00溢出时，CCAP0H装载到CCAP0L中，实现无干扰的更新PWM。

CCAP1L=0xc0//当CL小于CCAP1L时，输出为低大于时，输出为高。

CCAP1H=0xc0//当CL由ff变为00溢出时，CCAP1H装载到CCAP1L中，实现无干扰的更新PWM。

CCAPM0=0X42//使能PWM模式,PWM0=1,ECOM0=1

CCAPM1=0X42//使能PWM模式,PWM1=1,ECOM1=1

CR=1 //启动PCA计数器

while(1)

{

CCAP0H=RF4432_TxRxBuf[4] //此处改变占空比

CCAP1H=RF4432_TxRxBuf[5]

CCAP2H=RF4432_TxRxBuf[6]/2.5

}

}

#include <intrins.h>

#include <stdio.h>

#include <math.h>

#include "UPSD3200.H"

#include "upsd_pwm.h"

#define uint unsigned int

#define uchar unsigned char

PSD_REGS PSD8xx_reg _at_ csiop

#define KEYIO (~(PSD8xx_reg.DATAIN_A)) &0x07

sbit CP=P4^7

sbit U_D=P1^1

void init_system()// 系统初始化

uchar keyboard()

void uPSD_PWM4_Variable(unsigned char PWM_Period, unsigned char PWM_PulseWidth)

uchar Adjust_station=NO

unsigned char data x,flag

unsigned char keyboard() //键盘输入

{

unsigned char a=0xff,b=0x01,c=0xf8,d//有按键的位置

uint i

do{

a=KEYIO|c

}while(a==0xff)

if (a == 0xfe){d = '1'}

else if (a == 0xfd){d = '2'}

else if (a == 0xfb){d = '3'}

else {d = '0'}

return(d)

}

void uPSD_PWM4_Init(void)

unsigned int PWM_prescaler

P4SFS |= 0x80

PWM_prescaler = (unsigned int)((FREQ_OSC/2)/PWM4_INPUT_freq)//PWM4输入脉冲频率 K

PSCL1L = PWM_prescaler &0x00ff

PSCL1H = (PWM_prescaler >>8)

}

void StepMotor_GO(bit direction,uint speed) {

unsigned char PWM_Period, PWM_PulseWidth

uint temp_uint

U_D = direction//方向

temp_uint = (PWM4_INPUT_freq*1000)/speed

PWM_Period = (unsigned char)temp_uint

PWM_PulseWidth = PWM_Period/2

uPSD_PWM4_Variable(PWM_Period,PWM_PulseWidth)

}

void StepMotor_STOP(void)

{

P4SFS &= 0x7f

}

void uPSD_PWM4_Variable(unsigned char PWM_Period, unsigned char PWM_PulseWidth)

{

P4SFS |= 0x80

PWMVP = PWM_Period

PWMVPW = PWM_PulseWidth

PWMCON |= 0x20

}

void initkey(void){

PSD8xx_reg.DATAOUT_A=0xFF

PSD8xx_reg.CONTROL_A=0x00

PSD8xx_reg.DIRECTION_A=0x00

}

void init_system() // 系统初始化

{

WDKEY=0x55

P4SFS = (unsigned char) (0x08 <<3)

uPSD_PWM_Channel_8bit(3,243)

问题补充：(接着上面的序)

void uPSD_PWM_Init_8bit(unsigned char PWM_channel_no, unsigned int PWM_freq8, unsigned char PWMCON_value)

{

unsigned int PWM_prescaler

unsigned char output_polarity_mode

output_polarity_mode = PWMCON_value &0x8F

PWMCON = (PWMCON &0x70) | output_polarity_mode

P4SFS = (unsigned char) (0x08 <<PWM_channel_no)

PWM_prescaler = (unsigned int) ( (((unsigned int) FREQ_OSC) / 2) / PWM_freq8)

PSCL0L = PWM_prescaler &0x00ff

PSCL0H = (PWM_prescaler >>8)

PSCL1L = PWM_prescaler &0x00ff

PSCL1H = (PWM_prescaler >>8)

}

void uPSD_PWM_Disable(void)

{

PWMCON &= 0xDF

}

void main(void){

x=0

init_system()

flag=1

while(flag==1){

x=keyboard()

if(x=='1') {StepMotor_GO(0,100)}

else if(x=='2') {StepMotor_GO(1,500)}

else if(x=='3') { StepMotor_STOP()uPSD_PWM_Disable()}

else if(x=='0') {uPSD_PWM_Disable()}

}

}

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