PA1 EXTERNAL INTERRUPT ISSUE

[Khansokhua]

Hello,

STM32CubedIDE, STM407G DISC1 BOARD

     I am trying to trigger an external interrupt by using a button connected to PA1 pin. 

My configurations are below;

  1-) I enabled 7.bit in NVIC_ISER register.   IRQN_EXTI0 is enabled

  2-) I enabled  GPIOAEN  in RCC register.    GPIOA  clock is enabled.

  3-)  I wrote  '1' into the  TR1 in EXTI> RTRS register for RISING EDGE. 

  4-)  I enabled SYSCFG clock.

  5-)  Although the reset value is already '0'(which is corresponding to A Port) 

         for  SYSCFG_EXTICR1> EXTI1, I wrote '0' again for Port A and pin 1(EXTI1)

   6-) I set EXTI>IMR> MR1 bit in the register for not masking the line 1( due to being 1.pin )

   7-) Other pin configurations are, Pull-Down, High-Speed and Push-Pull for OTYPE

I succeed in making it work for PA0 and PB0 external interrupts individually.I debugged each step and it seems everything is fine. I suspect due to I use first pin, I am missing something here.I haven't figured it out yet. However, PA0 and PA1 share most register common.Only difference could be the MR bits but I have checked  them several times.

For better understanding, I tried to capture the high logic with a single LED using PA1 button, after I configurated it identically as in the above.Result is positive, I can capture it is able to be high but cannot trigger interrupt. What am I missing? I am looking forward to handle the issue. Thank you for your assistance. 

Respects Khansokhua

[SofLit]

---

@Khansokhua wrote:

I can only see five handler in start-up file for STM407.

  .word	EXTI0_IRQHandler             			/* EXTI Line0 interrupt                                               */
  .word	EXTI1_IRQHandler             			/* EXTI Line1 interrupt                                               */
  .word	EXTI2_IRQHandler             			/* EXTI Line2 interrupt                                               */
  .word	EXTI3_IRQHandler             			/* EXTI Line3 interrupt                                               */
  .word	EXTI4_IRQHandler             			/* EXTI Line4 interrupt                                               */

---

Look at the table Table 62 in the reference manual:

Look also at the start up file .s.

[Khansokhua]

Everything fits perfect now , thanks for your help @Tesla DeLorean @SofLit 

[SofLit]

---

@Khansokhua wrote:

Everything fits perfect now , thanks for your help @Tesla DeLorean @SofLit 

---

So in that case please mark the comment that answered your question as solution.

[Khansokhua]

I already accepted one of the response as a solution. Do I need to do anything else?