Ext. Interrupt conflict on STM32H7 ?

[HMSEdinburge]

Hello, I'm using H723 Nucleo. I set 5 ext interrupt pins: PA0, PA1, PA4, PC2_C, and PC13 as EXTI to 5 switches, enabled NVIC interrupt, GPIO pull-up,  interrupt with rising edge triggered, and tied these 5 pins to switches with the other end to ground. The code is working fine, but I observe that only 1 interrupt (either 1 of the 5 switches) can work at any one time, and all 5 interrupts cannot work together at any instance... is this interrupt conflict on H7? Anyone can advise? 

if (GPIO_Pin == GPIO_PIN_0)
	{
		// on LED1
	}

[Sarra.S]

Hello @HMSEdinburge,

Make sure that each EXTI line is configured for the respective GPIO pins, each pin should be assigned to a unique EXTI

Also, could share some code? 

[HMSEdinburge]

Hi i had checked and re-check the Pins assignment as screenshot and code below:

void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
	if (GPIO_Pin == Btn1_Pin)  // PIN_0
	{
		// LED1 on
	}

	else if (GPIO_Pin == GPIO_PIN_1)  
	{
		// LED2 ON
	}

	else if (GPIO_Pin == Btn2_Pin) 
	{
		// LED 3 ON
	}

	else if (GPIO_Pin == Btn3_Pin)
	{
		// LED3 ON;
	}

	else if (GPIO_Pin == GPIO_PIN_13)
	{
		// LED 4 ON
	}
}

below, 

[SofLit · Accepted solution]

Hello @HMSEdinburge ,

First, I have remarks regarding the info you provided:

---

@HMSEdinburge wrote:

enabled NVIC interrupt, GPIO pull-up,  interrupt with rising edge triggered,

 -> You set pull up and you set the EXTI edge to rising which is not correct. You need either to set pull-up resistor and set the edge to falling or set pull-down resistor and set the edge to rising.

---

@HMSEdinburge wrote:

Hello, I'm using H723 Nucleo. I set 5 ext interrupt pins: PA0, PA1, PA4, PC2_C, and PC13

PA1 is connected to the ETH PHY RMII_REF_CLK pin on the board. need to select another pin. PC13 is used by the user button which has already an external pull-down resistor. So no need to set pull up/down internal resistor.

Now regarding the code, this is how it could be managed:

void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
  switch(GPIO_Pin)
  {
    case GPIO_PIN_0:  exti_source  = 1; break; // PA0
    case GPIO_PIN_3:  exti_source  = 2; break; // PA3 instead of PA1
    case GPIO_PIN_4:  exti_source  = 3; break; // PA4
    case GPIO_PIN_2:  exti_source  = 4; break; // PC2_C 
    case GPIO_PIN_13: exti_source  = 5; break; // PC13
    default: exti_source= 0; break;
  }
}

I've attached a project running on NUCLEO-H723 that uses all these EXTIs (just replaced PA1 by PA3) . Put exti_source in live watch and you can see the value that changes according to the EXTI event triggered.

Hope that answers your question.

[HMSEdinburge]

yes, i m using PC13 on-board switch, I'll try your code and suggestion...