stc8g單片機通過pwm調節led亮度,通電的時候會亮起再滅下

ID:1076567 · 發表于 2024-6-6 09:26

想學pwm，所以在網上下了一個臺燈的代碼自己修改了一下，按鍵key是負責led亮滅，key1短按可以增加led亮度，key2短按減少亮度，長按都可以無極調光，LIGHT是p33口輸出，我設置了通電會自動亮起，亮度為50，但是它通電會亮起再滅掉再亮起，設置成通電不亮起，也會亮一下，在主函數最開始的時候加過LIGHT=0，也還是不行嘞，我試過原來的代碼也會亮一下，但是不知道哪里有問題，有沒有大佬看一下

main.c文件
#include       "config.h"
#include       "gpio.h"
#include       "UART.h"
#include       "delay.h"
#include       "stdio.h"
#include       "STC8xxxx.H"
#include       "stdio.h"
#include       "string.h"
#include       "light.h"
#include       "my_uart.h"
#include       "key.h"

void main(void)
{
      light_init();             //使用定時器0作pwm功能
      key_init();
      EA = 1;

      delay_ms(5000);
      light_open();

      while (1)
      {
            delay_ms(1);

            if(key_open())
            {
                     light_key_open();
            }
            if(scan_key())
            {
                     //按鍵按下
                     light_task();
            }
      }
}

key.c文件

#include "key.h"

#define KEY P32
#define Key2 P30
#define Key1 P31

bit ShortTouchFlag1=0;    //按鍵1短按按鍵有效標志
bit LongTouchFlag1=0;    //按鍵1長按按鍵有效標志
bit LongTouchRelease1=1; //按鍵1長按釋放過的標志
bit ShortTouchFlag2=0;    //按鍵2短按按鍵有效標志
bit LongTouchFlag2=0;    //按鍵2長按按鍵有效標志
bit LongTouchRelease2=1; //按鍵2長按釋放過的標志
bit Flag_1s=1;             //秒任務標志位
bit HFlag = 0;
bit ON_OFF_Flag = 0;

unsigned int uiKeyTimeCnt1; //按鍵1計數
unsigned int uiKeyTimeCnt2; //按鍵2計數

//P54作io輸入口
void key_init(void)
{
      GPIO_InitTypeDef       GPIO_InitStructure;             //結構定義
      GPIO_InitStructure.Pin  = GPIO_Pin_5;             //指定要初始化的IO,
      GPIO_InitStructure.Mode = GPIO_HighZ;             //指定IO的輸入或輸出方式,GPIO_PullUp,GPIO_HighZ,GPIO_OUT_OD,GPIO_OUT_PP
      GPIO_Inilize(GPIO_P5,&GPIO_InitStructure);       //初始化

      // GPIO_InitStructure.Pin  = GPIO_Pin_All;             //指定要初始化的IO, GPIO_Pin_0 ~ GPIO_Pin_7
      // GPIO_InitStructure.Mode = GPIO_PullUp;             //指定IO的輸入或輸出方式,GPIO_PullUp,GPIO_HighZ,GPIO_OUT_OD,GPIO_OUT_PP
      // GPIO_Inilize(GPIO_P6,&GPIO_InitStructure);       //初始化
}

unsigned char key_open(void) //掃描開關按鍵
{
      if(KEY==0)
      {
            delay_ms(15);
            if(KEY==0)
            {
                        while(KEY==0);
                              ON_OFF_Flag = 1;
                              return 1;
            }
      }
      return 0;
}

//掃面按鍵
//返回 1 按下  0 沒有
unsigned char scan_key(void)
{
      if(Key1==0)                   //如果按鍵1按下
      {
         uiKeyTimeCnt1++;          //累加按鍵計時
      }
      if(uiKeyTimeCnt1>100 && LongTouchRelease1==1) //當按鍵超過2秒且此前釋放過一次時
      {
            LongTouchFlag1 = 1;       //長按標志位置1，用于長按2秒后立即處理長按動作
            LongTouchRelease1 = 0;                //長按釋放標志置0，表示長按未釋放
            HFlag = 1;
      }
      if(Key1==1)                   //當按鍵松開（也可能是抖動彈開）
      {
            if(uiKeyTimeCnt1>2 && uiKeyTimeCnt1<=100) //只有大于20mS，且小于2秒，才判為短按
            {
                     uiKeyTimeCnt1 = 0;    //清零按鍵計時
                     ShortTouchFlag1 = 1;       //短按標志位置1
                     LongTouchFlag1 = 0;    //長按標志位置0
                     HFlag = 1;
            }
            if(uiKeyTimeCnt1>100)    //如果松開按鍵時按鍵超過2秒，則為長按釋放
            {
                     uiKeyTimeCnt1 = 0;    //清零按鍵計時
                     LongTouchRelease1 = 1;  //長按釋放標志位置1，表示長按已釋放
            }
      }

      if(Key2==0)                   //如果按鍵2按下
      {
         uiKeyTimeCnt2++;          //累加按鍵計時
      }
      if(uiKeyTimeCnt2>100 && LongTouchRelease2==1) //當按鍵超過2秒且此前釋放過一次時
      {
            LongTouchFlag2 = 1;       //長按標志位置1，用于長按2秒后立即處理長按動作
            LongTouchRelease2 = 0;    //長按釋放標志置0，表示長按未釋放
            HFlag = 1;
      }
      if(Key2==1)                   //當按鍵松開（也可能是抖動彈開）
      {
            if(uiKeyTimeCnt2>=2 && uiKeyTimeCnt2<=100)  //只有大于等于20mS，且小于2秒，才判為短按
            {
                     uiKeyTimeCnt2 = 0;    //清零按鍵計時
                     ShortTouchFlag2 = 1; //短按標志位置1
                     LongTouchFlag2 = 0;    //長按標志位置0
                     HFlag = 1;
            }
            if(uiKeyTimeCnt2>100)    //如果松開按鍵時按鍵超過2秒，則為長按釋放
            {
                     uiKeyTimeCnt2 = 0;    //清零按鍵計時
                     LongTouchRelease2 = 1;  //長按釋放標志位置1，表示長按已釋放
            }
      }
      if(HFlag==1)
      {
            return 1;
      }
      else
      {
            return 0;
      }
}

light.c文件

#include "light.h"

#include       "timer.h"
#include       "GPIO.h"
#include  "key.h"

extern bit ShortTouchFlag1;    //按鍵1短按按鍵有效標志
extern bit LongTouchFlag1;    //按鍵1長按按鍵有效標志
extern bit LongTouchRelease1; //按鍵1長按釋放過的標志
extern bit ShortTouchFlag2;    //按鍵2短按按鍵有效標志
extern bit LongTouchFlag2;    //按鍵2長按按鍵有效標志
extern bit LongTouchRelease2; //按鍵2長按釋放過的標志
extern bit ON_OFF_Flag;       //按鍵開關標志

unsigned long timer0_count = 0;
unsigned char PWM_T = 0; //0-250占空比控制變
unsigned char current_brightness = 0;       //當前亮度
unsigned char light_switch_state = 0;       //燈開關狀態
signed int brightness = 0;

#define IT_HZ       100000       //中斷頻率
#define TIM0_VALUE       65536UL - (MAIN_Fosc / IT_HZ)

void       light_init(void)
{
      GPIO_InitTypeDef       GPIO_InitStructure;                               //結構定義
      TIM_InitTypeDef             TIM_InitStructure;                                              //結構定義
/************************ P33 IO口配置 ****************************/
      GPIO_InitStructure.Pin  = LIGHT_PIN;                               //指定要初始化的IO, GPIO_Pin_0 ~ GPIO_Pin_7, 或操作
      GPIO_InitStructure.Mode = GPIO_PullUp;                      //指定IO的輸入或輸出方式,GPIO_PullUp,GPIO_HighZ,GPIO_OUT_OD,GPIO_OUT_PP
      GPIO_Inilize(LIGHT_PORT,&GPIO_InitStructure);       //初始化

/************************ 定時器配置 ****************************/
      TIM_InitStructure.TIM_Mode    = TIM_16BitAutoReload;       //指定工作模式, TIM_16BitAutoReload,TIM_16Bit,TIM_8BitAutoReload,TIM_16BitAutoReloadNoMask
      TIM_InitStructure.TIM_Priority = Priority_0;                      //指定中斷優先級(低到高) Priority_0,Priority_1,Priority_2,Priority_3
      TIM_InitStructure.TIM_Interrupt = ENABLE;                                     //中斷是否允許, ENABLE或DISABLE
      TIM_InitStructure.TIM_ClkSource = TIM_CLOCK_1T;             //指定時鐘源,    TIM_CLOCK_1T,TIM_CLOCK_12T,TIM_CLOCK_Ext
      TIM_InitStructure.TIM_ClkOut = DISABLE;                               //是否輸出高速脈沖, ENABLE或DISABLE
      // TIM_InitStructure.TIM_Value    = 65536UL - (MAIN_Fosc / 100000UL);             //初值,
      TIM_InitStructure.TIM_Value    = TIM0_VALUE;             //初值,
      TIM_InitStructure.TIM_Run    = ENABLE;                                     //是否初始化后啟動定時器, ENABLE或DISABLE
      Timer_Inilize(Timer0,&TIM_InitStructure);                                     //初始化Timer0       Timer0,Timer1,Timer2,Timer3,Timer4

}

//設置高電平占空比
//num: 0-100%
void set_duty_cycle(unsigned char num)
{
      current_brightness = num;
      if(num > 0)
      {
            light_switch_state = 1;
      }
      else
      {
            light_switch_state = 0;
      }
      PWM_T = (float)(num / 100.0)*250;
}

/********************* Timer0中斷函數************************/
void timer0_int (void) interrupt TIMER0_VECTOR
{
      timer0_count++; //每次定時器溢出加1

      if(timer0_count==250) //PWM周期 100個單位
               {
                     timer0_count=0;  //使t=0，開始新的PWM周期
                     LIGHT = 1;       //開燈
               }

      if(PWM_T==timer0_count)  //按照當前占空比切換輸出為高電平
               {
                     LIGHT = 0;       //關燈
               }

}

//獲取燈光占空比
//返回值: 0-100
int get_light_pwm(void)
{
      return PWM_T*100/250;
      // return 0;
}

void light_open(void)          //通電的時候自動亮起
{
            light_switch_state = 1;
            set_duty_cycle(50);             //設置占空比
      brightness = 50;
}

void light_key_open(void)    //開關key操作
{
            if(ON_OFF_Flag==1)
                     {
                              ON_OFF_Flag = 0;
                              if(light_switch_state==1)
                              {
                                    light_switch_state=0;
                                    EA = 0;
                                    set_duty_cycle(0);
                                    LIGHT = 0;
                              }
                              else
                              {
                                    EA = 1;
                                    light_switch_state=1;
                                    set_duty_cycle(brightness);             //設置占空比
                              }
                     }
}

void light_task(void)    //調節亮度
{
      if(ShortTouchFlag1==1)
            {
                     ShortTouchFlag1 = 0;
                     brightness = current_brightness + 20;
                     if(brightness > 70)       //防止超過100
                     {
                              brightness = 100;
                     }
                     if(brightness == 20)
                     {
                              brightness = 10;
                     }
                     set_duty_cycle(brightness);
            }

            if(LongTouchFlag1==1)
            {
                     LongTouchFlag1 = 0;
   while(brightness<100)
                     {
      brightness = current_brightness + 1;
                              set_duty_cycle(brightness);
                              delay_ms(10);
                              scan_key();
                              if(LongTouchRelease1==1)
                              {
                              break;
                              }
                     }
            }

            if(ShortTouchFlag2==1)
                     {
                              ShortTouchFlag2 = 0;
                              brightness = current_brightness - 20;
      if(brightness >70)
                              {
                                    brightness = 70;
                              }
                              if(brightness <10)
                              {
                                    brightness = 0;
                                    light_switch_state = 0;
                              }
                              set_duty_cycle(brightness);
                     }

                     if(LongTouchFlag2==1)
                     {
                              LongTouchFlag2 = 0;
                              while(brightness>6&&LongTouchRelease2==0)
                              {
                                    brightness = current_brightness - 1;
                                    set_duty_cycle(brightness);
                                    delay_ms(10);
                                    scan_key();
                                    if(LongTouchRelease2==1)
                                    {
                                             break;
                                    }
                              }
                     }
}