PWM控制输出代码.doc

#ifndef INCLUDE_H#define INCLUDE_H #include AT89X51.h #include intrins.h #define uchar unsigned char #define uint unsigned int #define _BV(x) (1(x) #define GET_BIT(x,y) (x)&(1(y)=0?0:1) /*取x变量y位的数据*/ #define SET_BIT(x,y) (x)|=(0x0001(y) /*置位x变量y位*/ #define CLR_BIT(x,y) (x)&=(0x0001(y) /*清零x变量y位*/ #define LET_BIT(x,y,z) (x)=(x)&(0x0001(y)|(z) stillTimesMax) stillTimes = 0; #if REPEAT_MODE if(FIRST_TIMES = stillTimesMax) stillTimesMax = OTHER_TIMES; #endif return keyValueTemp; #else stillTimes = 0; return 0; #endif else stillTimes = 0; return 0; return 0;/*函数名称：get_data_1_count(uchar number)*函数功能：计算uchar类型变量中的数量，用于检测是否多键按下*函数入口：number,需要检测数量的变量*函数出口：返回变量bumber中的数量*/uchar get_data_1_count(uchar number) register uchar i,j = 0; for(i = 0; i 8; i +) if( (number&_BV(i) ) j +; return j;/*函数名称：delay_us(uint us)*函数功能：毫秒级延时*函数入口：延时计数变量us*函数出口：无*/void delay_us(uint us) uchar delayi; while(-us) for(delayi=0;delayi= 1)&(NewPwmValue = 99) /一个周期里 pwmH = NewPwmValue;else /若占空比不在.99范围内则输出一个尖脉冲 pwmH =0x01;/*函数名称：pwmProduce(void)*函数功能：定时器溢出中断设置*函数入口：无*函数出口：无*/void pwmProduce(void) interrupt 3pwmPeriodCont+; /PWM定时周期计数加 if(pwmPeriodCont= PWM_Period)/ 一个频率周期结束 pwmPeriodCont=0; /*驱动功能：产生pwm,12MHZ晶振下，总周期为*1ms*版本：.0.1*作者：lhw*时间：.06.11*/#ifndef PWM_H#define PWM_H #include Include.h #ifndef PWM_GLOBAL #define PWM_EXT extern #else #define PWM_EXT #endif #define PWM_Period 100 /100%占空比时标数/*端口定义* sbit PWM_OUT=P12; /*pwm输出端口映射*/* PWM_EXT uchar pwmPeriodCont; / PWM 占空比计数器 PWM_EXT uchar pwmH; PWM_EXT void pwm_init(void); /*PWM初始化，设置定时器*/ PWM_EXT void pwm_set(const uchar NewPwmValue); /*PWM占空比设置*/ #endif#include led.h#include key.h#include pwm.hstatic uchar pwmScale; /pwm占空比,199void main() uchar keyValue; pwm_init(); /初始化pwm,pwm高电平默认值为 key_init(); led_init(); pwmScale=0x01; /初始化占空比变量，初始值为 sei(); while(1) keyValue=get_key_value();if(keyValue!=KEY_NULL) if(keyValue=KEY_UP) if(pwmScale1) pwmScale-; pwm_set(pwmSc