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標(biāo)題: STM8單片機(jī)想用按鍵來控制PWM輸出頻率,現(xiàn)在寫好后發(fā)現(xiàn)按鍵無反應(yīng),求大佬 [打印本頁]

作者: wang7128953 時間: 2024-2-18 13:58
標(biāo)題: STM8單片機(jī)想用按鍵來控制PWM輸出頻率,現(xiàn)在寫好后發(fā)現(xiàn)按鍵無反應(yīng),求大佬
#include "STM8S.h"

unsigned char  a=20;

signed long int  pwm_duty;

void delay_ms (int ms) //延時函數(shù)

{

for (int i=0; i<=ms; i++)

for (int j=0; j<120; j++); // Nop = Fosc/4

}

void KEY(void)

{

GPIO_DeInit(GPIOC);//D口默認(rèn)狀態(tài)

GPIO_Init(GPIOC, GPIO_PIN_5, GPIO_MODE_IN_FL_NO_IT);

GPIO_Init(GPIOC, GPIO_PIN_4, GPIO_MODE_IN_FL_NO_IT);

      if (GPIO_ReadInputPin(GPIOC,GPIO_PIN_5) == 0)       //加1按鍵有效
      {
         delay_ms(20);
         //延時去抖一般10-20ms
         if (GPIO_ReadInputPin(GPIOC,GPIO_PIN_5) == 0)

         {
            while (GPIO_ReadInputPin(GPIOC,GPIO_PIN_5) == 0);

            if (a < 41)

               a = a+1;
         }
      }

      if (GPIO_ReadInputPin(GPIOC,GPIO_PIN_4) == 0)       //減1按鍵有效
      {
         delay_ms(20);

         if (GPIO_ReadInputPin(GPIOC,GPIO_PIN_4) == 0)

         {
            while (GPIO_ReadInputPin(GPIOC,GPIO_PIN_4) == 0)

            if (a > 1)

               a =a-1;

         }

}

}

void PWM(void)

{

pwm_duty=2000000/a/30;

CLK_HSIPrescalerConfig(CLK_PRESCALER_HSIDIV1);//  有些硬件會自動八分頻導(dǎo)致后面的計(jì)算出現(xiàn)錯誤

CLK_HSICmd(ENABLE); //打開內(nèi)部的時鐘函數(shù)

TIM2_DeInit(); //TIM2回復(fù)默認(rèn)

GPIO_Init(GPIOD,GPIO_PIN_4,GPIO_MODE_OUT_PP_LOW_FAST);//設(shè)置 Timer2 D4口輸出PWM模式

TIM2_OC1Init(TIM2_OCMODE_PWM1, TIM2_OUTPUTSTATE_ENABLE,pwm_duty/2,TIM2_OCPOLARITY_HIGH);

TIM2_TimeBaseInit(TIM2_PRESCALER_8,pwm_duty);//16M晶振

TIM2_OC2PreloadConfig(ENABLE);

TIM2_Cmd(ENABLE);//啟用Timer2定時器
}

void main(void)

{
  PWM();

while(1)
{
  KEY();
}

}

#ifdef USE_FULL_ASSERT

/**
  * @brief  Reports the name of the source file and the source line number
  * where the assert_param error has occurred.
  * @param file: pointer to the source file name
  * @param line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t* file, uint32_t line)
{
  /* User can add his own implementation to report the file name and line number,
   ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */

  /* Infinite loop */
  while (1)
  {
  }
}
#endif

/**
  * @}
  */

代碼如上，百思不得其解！求大佬幫忙看看

作者: zhuls 時間: 2024-2-20 12:02
流程不對，你按對鍵后a值沒有反饋到PWM控制中去，a值變了還要pwm_duty才行。

好比你要請客，飯菜在灶臺，老是不端上桌子，客人能吃到熱乎的嗎？

歡迎光臨 (http://www.raoushi.com/bbs/)