按下三路按键，MCU唤醒且三路PWM有输出（占空比30%），松开按键PWM无输出，且MCU进入休眠状态（低功耗状态）。按键1按下，PWM1输出，按键2按键3按下，PWM2/PWM3输出

单片机应用——PWM输出（一）_不执行

具体源程序如下所示

8位单片机项目合作请联系我：18665321219

/* =========================================================================
 * Project:       GPIO_Setting
 * File:          main.c
 * Description:   Set GPIO of PORTB
 *                  1. PORTB I/O state
 *                      - PB4 set input mode and enable pull-high resistor
 *                      - PB2 set output mode 
 *                      - PB1 set input mode and enable pull-low resistor
 *                      - PB0 set open-drain output mode                               
 *                                                          
 * Author:        JasonLee
 * Version:       V1.1                              
 * Date:          2018/09/07
 =========================================================================*/
#include <ny8.h>
/* =========================================================================
 * Project:       GPIO_Setting
 * File:          main.c
 * Description:   Set GPIO of PORTB
 *                  1. PORTB I/O state
 *                      - PB4 set input mode and enable pull-high resistor
 *                      - PB2 set output mode 
 *                      - PB1 set input mode and enable pull-low resistor
 *                      - PB0 set open-drain output mode                               
 *                                                          
 * Author:        JasonLee
 * Version:       V1.1                              
 * Date:          2018/09/07
 =========================================================================*/
#include "ny8_constant.h"
#include <stdint.h>
#define UPDATE_REG(x)    __asm__("MOVR _" #x ",F")

struct pwmflg
{
    uint8_t pwm1en : 1;
    uint8_t pwm2en : 1;
    uint8_t pwm3en : 1;
}pwmflg;

uint8_t sleepcent;
uint8_t pwmdcycle;  //计数1000为一个周期
uint8_t pwmduty1;
uint8_t pwmduty2;
uint8_t pwmduty3;
uint8_t pwmduty1s;
uint8_t pwmduty2s;
uint8_t pwmduty3s;

void peripinit(void)
{
    //  ;Initial GPIO  
    //  ; PORTB I/O state
    //  ; PB0、PB1、PB2 set output mode and enable pull-high resister   
    //  ;BPHCON = (uint8_t) ~( C_PB1_PHB | C_PB0_PHB | C_PB2_PHB );  // Enable PB0、PB1、PB2 Pull-High Resistor,others disable
    BPLCON = (uint8_t) ~( C_PB3_PLB );  //Enable PB3 Pull-low Resistor,others disable
    IOSTB = (uint8_t) ((~( C_PB1_Input | C_PB2_Input | C_PB0_Input )) | C_PB3_Input | C_PB4_Input | C_PB5_Input);  // Set PB0、PB1、PB2 to output mode,Set PB3、PB4、PB5 to output mode
    PORTB = 0x00;  //初始化为0
    BWUCON = C_PB5_Wakeup | C_PB4_Wakeup | C_PB3_Wakeup;  //使能PB5、PB4、PB3按键唤醒
    INTE = INTE | C_INT_PBKey;  //使能按键唤醒中断
    
    //;Initial time1
    //      ; instrclk i_hrc 4/4M  div = 1  计数8次溢出即可
    //      ;
    TMRH = 0X20
    TMR1 = 0x70;    //到0下溢出中断，计数100 //20M/2/100 = 100K
    T1CR1 = C_TMR1_Reload | C_TMR1_En;   //自动重载
    T1CR2 = C_TMR1_ClkSrc_Inst | C_PS1_Dis ;  //指令时钟
   
    INTE = INTE | C_INT_TMR1;    //使能定时器中断    
    INTF = 0;    //清除中断标志
    OSCCR = C_FHOSC_Sel;    //唤醒后进入正常模式
}

//尽量减小中断代码时长
void isr_hw(void) __interrupt(0)
{
    if(INTFbits.T1IF)
    {
        pwmdcycle++;  
        
        if(pwmdcycle == 0x3)    //周期10
        {
            PORTBbits.PB2 = 0;
            PORTBbits.PB1 = 0;
            PORTBbits.PB0 = 0;
            pwmduty1s = pwmduty1;  //按键按下时赋值0x3，按键松开赋值0xf（不可能执行）
            pwmduty2s = pwmduty2;  //
            pwmduty3s = pwmduty3;
            pwmdcycle = 0;
        }
        
        if(pwmdcycle == pwmduty1s)    //占空比3
        {
            PORTBbits.PB0 = 1;
        }
        
        if(pwmdcycle == pwmduty2s)    //占空比3
        {
            PORTBbits.PB1 = 1;
        }
        
        if(pwmdcycle == pwmduty3s)    //占空比3
        {
            PORTBbits.PB2 = 1;
        }  
     INTFbits.T1IF = 0;   //写在if语句防止意外清除标志位
    }
    
    if(INTFbits.PBIF)     //清除按键中断标志
    {
        INTFbits.PBIF = 0;
    }
}

void delayms(uint8_t ms)   //CLK_20M/IN_2T = 10M,MS = 100,延时61ms
{
    uint8_t i = 0xff;
    while(ms--)
    {
        while(i--);
    }
}

void main(void)           //main()函数周期11us
{  
    pwmflg.pwm1en = 0;
    pwmflg.pwm2en = 0;
    pwmflg.pwm3en = 0;
    
    pwmduty1s = 0;
    pwmduty2s = 0;
    pwmduty3s = 0;
    
    pwmdcycle = 0;
    pwmduty1 = 0xf;
    pwmduty2 = 0xf;
    pwmduty3 = 0xf;
    sleepcent = 0;
    
    DISI();
    peripinit();
    ENI();
      
    while(1)
    {
        CLRWDT();
        //PB3状态检测
        if((PORTBbits.PB3 == 1)&&(pwmflg.pwm1en == 0))
        {
            delayms(50);    //估计在10ms左右
            if(PORTBbits.PB3 == 1)
            {
                pwmduty1 = 2;  //占空比为25%
                pwmflg.pwm1en = 1;
            }
            else
            {
                pwmduty1 = 0xf;  //占空比为就是不执行
            }
        }
        else if(PORTBbits.PB3 == 0)
        {
            pwmduty1 = 0xf;  //占空比为就是不执行
            pwmflg.pwm1en = 0;
        }
        //PB4状态检测
        if((PORTBbits.PB4 == 1)&&(pwmflg.pwm2en == 0))
        {
            delayms(50);    //估计在10ms左右
            if(PORTBbits.PB4 == 1)
            {
                pwmduty2 = 2;  //占空比为25%
                pwmflg.pwm2en = 1;
            }
            else
            {
                pwmduty2 = 0xf;  //占空比为就是不执行
            }
        }
        else if(PORTBbits.PB4 == 0)
        {
            pwmduty2 = 0xf;  //占空比为就是不执行
            pwmflg.pwm2en = 0;
        }
        //PB5状态检测
        if((PORTBbits.PB5 == 1)&&(pwmflg.pwm3en == 0))
        {
            delayms(50);    //估计在10ms左右
            if(PORTBbits.PB5 == 1)
            {
                pwmduty3 = 2;  //占空比为30%
                pwmflg.pwm3en = 1;
            }
            else
            {
                pwmduty3 = 0xf;  //占空比为就是不执行
            }
        }
        else if(PORTBbits.PB5 == 0)
        {
            pwmduty3 = 0xf;  //占空比为就是不执行
            pwmflg.pwm3en = 0;
        }
        //休眠检测
        if(((PORTB & 0x38) == 0x00) && ((PORTB & 0x07) == 0x00))   //PB5、PB4、PB3输入低(无效)，PB0、PB1、PB2输出低(无效)
        {
            
            sleepcent++;     //累加100次
            if(sleepcent == 100)
            {
                PCON = PCON & (~ C_WDT_En);//关闭看门狗定时器
                SLEEP();//进入睡眠模式
                DISI();//关闭中断，唤醒后直接执行下一条指令
                PCON = PCON | C_WDT_En;//开启看门狗定时器
                ENI();//开启中断
            }
            //delayms(100);    //估计在10ms左右
        } 
        else
        {
            sleepcent = 0;
        }
    }
}