Unable to getting interrupt on rising edge

[JPanc.1]

I am using STM32F103C8T6 and STM32CubeMX and TrueSTUDIO for development purpose.

I am trying to get interrupt on rising edge and in ISR I wrote LED blinking code.

I gave high input for rising edge detection but not getting LED blink.

My code as follows...

static void MX_GPIO_Init(void)
{
 GPIO_InitTypeDef GPIO_InitStruct = {0};
 
 /* GPIO Ports Clock Enable */
 __HAL_RCC_GPIOC_CLK_ENABLE();
 __HAL_RCC_GPIOA_CLK_ENABLE();
 __HAL_RCC_GPIOB_CLK_ENABLE();
 
 /*Configure GPIO pin Output Level */
 HAL_GPIO_WritePin(LED_GPIO_Port, LED_Pin, GPIO_PIN_RESET);
 
 /*Configure GPIO pin Output Level */
 HAL_GPIO_WritePin(SD_CS_GPIO_Port, SD_CS_Pin, GPIO_PIN_SET);
 
 /*Configure GPIO pin : LED_Pin */
 GPIO_InitStruct.Pin = LED_Pin;
 GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_MEDIUM;
 HAL_GPIO_Init(LED_GPIO_Port, &GPIO_InitStruct);
 
 /*Configure GPIO pin : SD_CS_Pin */
 GPIO_InitStruct.Pin = SD_CS_Pin;
 GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_MEDIUM;
 HAL_GPIO_Init(SD_CS_GPIO_Port, &GPIO_InitStruct);
 
 /*Configure GPIO pin : ADXL345_INT_Pin */
 GPIO_InitStruct.Pin = ADXL345_INT_Pin;
 GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 HAL_GPIO_Init(ADXL345_INT_GPIO_Port, &GPIO_InitStruct);
 
 /*Configure GPIO pin : RTC_INT_Pin */
 GPIO_InitStruct.Pin = RTC_INT_Pin;
 GPIO_InitStruct.Mode = GPIO_MODE_IT_FALLING;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 HAL_GPIO_Init(RTC_INT_GPIO_Port, &GPIO_InitStruct);
 
 /* EXTI interrupt init*/
 HAL_NVIC_SetPriority(EXTI4_IRQn, 0, 0);
 HAL_NVIC_EnableIRQ(EXTI4_IRQn);
 
 HAL_NVIC_SetPriority(EXTI9_5_IRQn, 0, 1);
 HAL_NVIC_EnableIRQ(EXTI9_5_IRQn);
 
}
 
/****************************************************************/
/***************************ISR for GPIO***************************/
 
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
 /* Prevent unused argument(s) compilation warning */
 UNUSED(GPIO_Pin);
 /* NOTE: This function Should not be modified, when the callback is needed,
 the HAL_GPIO_EXTI_Callback could be implemented in the user file
 */
 if(GPIO_Pin == ADXL345_INT_Pin)
 {
	 HAL_GPIO_WritePin(LED_GPIO_Port, LED_Pin,0);
	 HAL_Delay(500);
	 HAL_GPIO_WritePin(LED_GPIO_Port, LED_Pin,1);
	 HAL_Delay(500);
 }
}

[Bob S]

What DO you get? Do you ever enter the callback function? Do you get into the callback but with a different pin? And should we presume that the ADXL345 interrupt pin is pin 4 on one of the GPIO ports (ex. PA4, PB4, etc.)?

Note that calling HAL_Delay() inside an interrupt callback will not work unless the SYSTICK interrupt has a higher priority than your EXTI interrupt. If not, HAL_Delay() will never return because it is waiting for a global variable to be incremented by the SYSTICK interrupt handler, which is blocked by your interrupt.

[JPanc.1]

ADXL345 pin is connected to PB4

Led just turns off when giving interrupt but not turn off after delay

I think it is a hal delay problem.

but if I want to blink led than what should I do???

[Bob S]

Declare a global variable like "volatile bool gotADXLInt = false;" (and you need the "volatile" qualifier). Then in your callback, set that to true. In your main code loop, check for gotADXLInt true and flash the LED.

[JPanc.1]

Still not getting detect rising edge...

Is any strep wrong?

[RomainR.]

Hello jay28pancha1,

As explain by Bob, remove for loop and HAL_Delay into HAL_GPIO_EXTI_Callback. Declare a global volatile boolean variable, and manage the toggle in your main loop .

IRQ_Handler and Callback function must be short without any overhead instruction code or software latency.

Then, can you try to configure GPIO_InitStruct.Pull = GPIO_PULLDOWN;

/*Configure GPIO pin : ADXL345_INT_Pin */
 GPIO_InitStruct.Pin = ADXL345_INT_Pin;
 GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING;
 GPIO_InitStruct.Pull = GPIO_PULLDOWN;
 HAL_GPIO_Init(ADXL345_INT_GPIO_Port, &GPIO_InitStruct);

And place a breakpoint in stm32f1xx_it.c at line GPIO_EXTI_IRQHandler. Check if you get this line when you apply a rising egde on PB4.

/**
 * @brief This function handles External line 4 interrupt request.
 * @param None
 * @retval None
 */
void EXTI4_IRQHandler(void)
{
 HAL_GPIO_EXTI_IRQHandler(GPIO_Pin);
}

Then continue debug (step out) you should enter into the callback function.

It should work. Share your code if not.

BR

rrom