EXTI IR Semms not to execute correctly (Too many if statements???)

[felix23]

Posted on November 01, 2014 at 18:32

Hi Guys,

I have written a handler for an external IR beeing executed on a STM32F107 controller. It looks like this: void EXTI9_5_IRQHandler(void) {     //TEST     GPIOE->BSRR = GPIO_Pin_9;    //set PE9   works fine     GPIOE->BRR = GPIO_Pin_9;    //clear PE9  works fine          if( (EXTI->IMR & EXTI_IMR_MR8) && (EXTI->PR & EXTI_PR_PR8))     {         EXTI_ClearITPendingBit(EXTI_Line8);         GPIOE->BSRR = GPIO_Pin_9;    //TEST does not work         if (GPIOA->ODR & GPIO_Pin_8)    //PA8 is set         {             if (GPIOE->ODR & GPIO_Pin_8)             {                 SetLED1();             }             else             {                 GPIOE->BSRR = GPIO_Pin_9;    //set PE9   doesn't work             }         }         else         {             GPIOE->BRR = GPIO_Pin_9;    //clear PE9    GPIO_ResetBits()         }     } } I use Keil µVision 5.11.1.0 Lite version. I wonder, why I cannot set PE9 by the command GPIOE->BRR = GPIO_Pin_9; in the code above. I a afraid, that it is some kind of compiler problem and it is simply removing the important part of the code. I decide, wether the code is working by looking at the GPIOE Peripherals view in Debug mode. Thanks for your hints

[Tesla DeLorean]

Posted on November 01, 2014 at 23:21

I a afraid, that it is some kind of compiler problem and it is simply removing the important part of the code.

Because that would be infinitely more probable than a failure in your logic? Suggest you review what the registers actually contain as it enters.