STM32L152 - can't woke from stop mode

[moran]

Posted on June 23, 2015 at 08:09

Hi everyone,

I'm trying to write code that  : 1) Enter STOP mode every falling of specific  EXTi pin. 2) Wake up every rising of this pin.

This is my code :

void

EnterStopMode(void) { /* // ASSERT(false); // Code is not written yet */      PWR_VoltageScalingConfig(PWR_VoltageScaling_Range3);   PWR_UltraLowPowerCmd(ENABLE);   PWR_EnterSTOPMode(PWR_Regulator_LowPower, PWR_STOPEntry_WFI);

}

/////////Interrupt routine : void EXTI4_IRQHandler(void) {     /// Falling ///     if(!(GPIOA->IDR & GPIO_Pin_4))     {          EnterStopMode();     }         /// Rising ///     if(GPIOA->IDR & GPIO_Pin_4)     {            ///Test point/// ---> debug probe        l_index^=1;        GPIO_WriteBit(GPIOD,GPIO_Pin_10, (BitAction)l_index);        //////////////////////////////        ///////////////////////////////////     }     // Clear the  EXTI line 4 pending bit      EXTI_ClearITPendingBit(EXTI_Line4); } /////////////////////////////////////////////////////////////////////// The device is entring stop mode ( I can see it using breakpoints ) , but it doesn't wake. It stuck there and i can't see any EXTi occur. Please advice.

[tm3341]

Posted on June 23, 2015 at 13:55

Try to first clear EXTI interrupt pending bit and try again.

[moran]

Posted on June 24, 2015 at 08:42

You right ....but still it doesn't help.

Below is my new IRQh : void EXTI4_IRQHandler(void) {     /// Falling ///     if(!(GPIOA->IDR & GPIO_Pin_4))     {       ///Test point/// ---> debug probe        l_index^=1;        GPIO_WriteBit(GPIOD,GPIO_Pin_10, (BitAction)l_index);        //////////////////////////////        ///////////////////////////////////               // Clear the  EXTI line 4 pending bit        EXTI_ClearITPendingBit(EXTI_Line4);               EnterStopMode();            }         /// Rising ///     if(GPIOA->IDR & GPIO_Pin_4)     {            ///Test point/// ---> debug probe        l_index^=1;        GPIO_WriteBit(GPIOD,GPIO_Pin_10, (BitAction)l_index);        //////////////////////////////        ///////////////////////////////////          // Clear the  EXTI line 4 pending bit         EXTI_ClearITPendingBit(EXTI_Line4);     }   } I'm probe out to scope the debug pin ...so i can see if it toggle --> wake up