external interrupt

[XooM]

void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
    if (GPIO_Pin == GPIO_PIN_1) 
        {
    	 uint32_t current_time = HAL_GetTick();  
    	 	   if ((current_time - last_interrupt_time) > 500)
    	 	 	 {
    	 		 last_interrupt_time = current_time;  		 	 
                         Button++;  
    	 	 	 }
        }
}

  while (1)
  {

	  if (Button== 2) {  
	          Button= 0;    
	       	  HAL_GPIO_WritePin(GPIOB, GPIO_PIN_14,GPIO_PIN_SET)
	      }
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */
}

Hello. The code I wrote with external interrupt does not work.

If I press the button with intervals shorter than 500ms, it should not detect these button bounces..
If I press the watch button for more than 500ms, I want it to detect it.
Even if I press the watch button for more than 500ms, the value of the button variable does not increase.

If I just write the code below, the button variable increases, but because of the button bounces, even though I want it to increase by +1, it increases like +5 to +10.

void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
       if (GPIO_Pin == GPIO_PIN_1) 
        {
    	
    	 Button++;
    	 	 	
        }
}

Why aren't my codes at the beginning of the message working?

[XooM]

Are you tired of my questions? 

[XooM]

Is there any mistake in my code guys?

[gbm]

The main mistake is the use of EXTI for button sensing. Do it inside SysTick ISR. I shown the solution long time ago - search for it.

The only reasonable case for buttons and EXTI is the wakeup from deep sleep modes.

[XooM]

What exact words should I search with?

[AScha.3]

OK, you can use the exti for things like buttons ( I do it also) - but you should use some hardware, that avoids useless bouncing: here a simple cap, maybe 10 or 100 nF ( Input to GND), keeps fast signal away and gives a good signal for a button press.

Next is then some delay, if needed; maybe you want a minimum time like 400 ms for a pressed button.

To do this, just have in exti a global variable set: Button_1_press=1; 

And in main do anything then ...and have also the check for the delay, to be ready for the next press after some time:

If(Button_1_press==1){

If(Button_1_pressed==0) Button_1_pressed =Hal_get_tick();

If(Hal_get_tick() - Button_1_pressed > 400 ){

Button_1_pressed = 0; Button_1_press =0; 

}

}

That's it...

[gbm]

No EXTI => just SystTick interrupt (already firing in every project).

EXIT => EXTI + SysTick interrupt + (optionally) resistor and capacitor.

So why should anyone use EXTI for buttons?

[AScha.3]

Why? It's a question of: how often is a button used and is other program in some way time critical; If button is used maybe once every two days, it's better to need no time in systick, every ms, all the time, but only when a button press comes. That's it - if you do just some menu functions with many buttons and using them often, then your way of checking it in systick i would also prefer.

[XooM]

This is a button I use frequently. The system needs to work by pressing this button continuously. Sometimes once a second, sometimes after 5 minutes..

[XooM]

void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
    if (GPIO_Pin == GPIO_PIN_1) 
        {
    	 uint32_t current_time = HAL_GetTick();  
    	 	   if ((current_time - last_interrupt_time) > 500)
    	 	 	 {
    	 		 last_interrupt_time = current_time;  		 	 
                         Button++;  
    	 	 	 }
        }
}

I still can't figure out why this code isn't working. No matter how fast or slow I press the button, it doesn't work. The button variable is definitely not increasing.