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?

[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?

 

[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?

[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.

[XooM]

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

If I write only this code into EXTI then the Button variable increases uncontrollably.

[AScha.3]

You have no cap parallel to the button... still?

So don't ++ , it's just nonsense.

Except you want to count how many times it's bouncing.