Entering into Busfault_handler after executing external interrupt for push button in STM32F407vg

[psati]

/******* Please check code snippet ************/

int flag = 0;

void EXTI_CONFIG(void)

{

//Enable clocks for GPIO and Sysconfig

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);

GPIO_InitTypeDef my_GPIO;

EXTI_InitTypeDef my_EXTI;

NVIC_InitTypeDef my_NVIC;

my_GPIO.GPIO_Mode = GPIO_Mode_IN;

my_GPIO.GPIO_OType = GPIO_OType_PP;

my_GPIO.GPIO_Pin = GPIO_Pin_0;

my_GPIO.GPIO_PuPd = GPIO_PuPd_DOWN;

my_GPIO.GPIO_Speed = GPIO_Speed_2MHz;

GPIO_Init(GPIOA, &my_GPIO);

SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource0);

my_EXTI.EXTI_Line = EXTI_Line0;

my_EXTI.EXTI_LineCmd = ENABLE;

my_EXTI.EXTI_Mode = EXTI_Mode_Interrupt;

my_EXTI.EXTI_Trigger = EXTI_Trigger_Rising;

EXTI_Init(&my_EXTI);

my_NVIC.NVIC_IRQChannel = EXTI0_IRQn;

my_NVIC.NVIC_IRQChannelCmd = ENABLE;

my_NVIC.NVIC_IRQChannelPreemptionPriority = 0x00;

my_NVIC.NVIC_IRQChannelSubPriority = 0x00;

NVIC_Init(&my_NVIC);

}

void EXTI0_IRQHandler()

{

if(EXTI_GetITStatus(EXTI_Line0)){

flag ^=1;

EXTI_ClearITPendingBit(EXTI_Line0);

}

}

/**

 * @brief Main program

 * @param None

 * @retval None

 */

int main(void)

{ 

 /* SysTick end of count event each 10ms */

 RCC_GetClocksFreq(&RCC_Clocks);

 SysTick_Config(RCC_Clocks.HCLK_Frequency / 100);

EXTI_CONFIG();

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);

GPIO_InitTypeDef my_gpiod;

my_gpiod.GPIO_Mode = GPIO_Mode_OUT;

my_gpiod.GPIO_OType = GPIO_OType_PP;

// my_gpiod.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;

my_gpiod.GPIO_PuPd = GPIO_PuPd_NOPULL;

my_gpiod.GPIO_Speed = GPIO_Speed_50MHz;

GPIO_Init(GPIOD, &my_gpiod);

 /* Infinite loop */

 while (flag){

GPIO_ToggleBits(GPIOD,0XF000);

 }

}

/*

After interrupt execution flow is stuck at this function

*/

void BusFault_Handler(void)

{

 /* Go to infinite loop when Bus Fault exception occurs */

 while (1)

 {

 }

}

[After Forever · Accepted solution]

Well your "infinite loop" isn't quite infinite is it? In a microconotroller system without an OS your application should never return from main.

Also, make the flag variable volatile if you are changing it from the interrupt handler and using it in the other parts of the code.

[psati]

Thank you. it is working now:smiling_face_with_smiling_eyes: