STM32C031 - EXTI doesn't fired

[MLemb.2]

Hello!

I'm coding board based on STM32 C031C6T6.

Everything works fine except EXTI interrupts - it doesn't fire.

I use PB5, PB6 and PB7 for buttons. I checked signals on hardware - it's ok, I can register falling edge. I use external pull-up.

I use CudeIDE 1.19.0.

main.c code:

/* USER CODE BEGIN Header */
/**
 ******************************************************************************
 * @file : main.c
 * @brief : Main program body
 ******************************************************************************
 * @attention
 *
 * Copyright (c) 2025 STMicroelectronics.
 * All rights reserved.
 *
 * This software is licensed under terms that can be found in the LICENSE file
 * in the root directory of this software component.
 * If no LICENSE file comes with this software, it is provided AS-IS.
 *
 ******************************************************************************
 */
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */

/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */

/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/
ADC_HandleTypeDef hadc1;

I2C_HandleTypeDef hi2c1;

TIM_HandleTypeDef htim3;
TIM_HandleTypeDef htim16;

UART_HandleTypeDef huart1;

/* USER CODE BEGIN PV */

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_TIM3_Init(void);
static void MX_ADC1_Init(void);
static void MX_I2C1_Init(void);
static void MX_TIM16_Init(void);
static void MX_USART1_UART_Init(void);
/* USER CODE BEGIN PFP */
#define PUTCHAR_PROTOTYPE int __io_putchar(int ch)
/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */

void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
	printf("Button interrupt callback\n\r");
	// Buttons functions
	if (GPIO_Pin == BTN3_Pin)
	{
		// Configuration button
		switch(deviceStatus)
		{
		case SET_TRESHOLD:
			deviceStatus = SAVE_TRESHOLD;
			break;
		case SET_HYSTERESIS:
			deviceStatus = SAVE_HYSTERESIS;
			break;
		case DISPLAY_ZERO:
			deviceStatus = PRESSURE;
			break;
			/*
			 * Erase timers functionality
		case TIMER_1:
			deviceStatus = TIMER_1_ERASE;
			break;
		case TIMER_2:
			deviceStatus = TIMER_2_ERASE;
			break;
			*/
		default:
			deviceStatus = SET_TRESHOLD;
			break;
		}
	}
	else
	{
		if (GPIO_Pin == BTN2_Pin)
		{
			// Plus / show timer 2 button
			switch (deviceStatus)
			{
			case SET_TRESHOLD:
				treshold++;
				break;
			case SET_HYSTERESIS:
				hysteresis++;
				break;
			case DISPLAY_ZERO:
				deviceStatus = SET_AND_SAVE_ZERO;
				break;
			default:
				deviceStatus = TIMER_2;
				timerVisibilityStart = generalTimer;
				break;
			}
		}
		else
		{
			if (GPIO_Pin == BTN1_Pin)
			{
				// Minus / show timer 1 button
				switch (deviceStatus)
				{
				case SET_TRESHOLD:
					treshold--;
					break;
				case SET_HYSTERESIS:
					hysteresis--;
					break;
				default:
					deviceStatus = TIMER_1;
					timerVisibilityStart = generalTimer;
					break;
				}
			}
		}
	}
}

/* USER CODE END 0 */

/**
 * @brief The application entry point.
 * @retval int
 */
int main(void)
{

 /* USER CODE BEGIN 1 */

 /* USER CODE END 1 */

 /* MCU Configuration--------------------------------------------------------*/

 /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
 HAL_Init();

 /* USER CODE BEGIN Init */

 /* USER CODE END Init */

 /* Configure the system clock */
 SystemClock_Config();

 /* USER CODE BEGIN SysInit */

 /* USER CODE END SysInit */

 /* Initialize all configured peripherals */
 MX_GPIO_Init();
 MX_TIM3_Init();
 MX_ADC1_Init();
 MX_I2C1_Init();
 MX_TIM16_Init();
 MX_USART1_UART_Init();
 /* USER CODE BEGIN 2 */

 /* USER CODE END 2 */

 /* Infinite loop */
 /* USER CODE BEGIN WHILE */
 while (1)
 {
	 Device_runProcess();

 /* USER CODE END WHILE */

 /* USER CODE BEGIN 3 */
 }
 /* USER CODE END 3 */
}

/**
 * @brief System Clock Configuration
 * @retval None
 */
void SystemClock_Config(void)
{
 RCC_OscInitTypeDef RCC_OscInitStruct = {0};
 RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

 __HAL_FLASH_SET_LATENCY(FLASH_LATENCY_0);

 /** Initializes the RCC Oscillators according to the specified parameters
 * in the RCC_OscInitTypeDef structure.
 */
 RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
 RCC_OscInitStruct.HSIState = RCC_HSI_ON;
 RCC_OscInitStruct.HSIDiv = RCC_HSI_DIV4;
 RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
 if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
 {
 Error_Handler();
 }

 /** Initializes the CPU, AHB and APB buses clocks
 */
 RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
 |RCC_CLOCKTYPE_PCLK1;
 RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
 RCC_ClkInitStruct.SYSCLKDivider = RCC_SYSCLK_DIV1;
 RCC_ClkInitStruct.AHBCLKDivider = RCC_HCLK_DIV1;
 RCC_ClkInitStruct.APB1CLKDivider = RCC_APB1_DIV1;

 if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
 {
 Error_Handler();
 }
}

/**
 * @brief ADC1 Initialization Function
 * None
 * @retval None
 */
static void MX_ADC1_Init(void)
{

 /* USER CODE BEGIN ADC1_Init 0 */

 /* USER CODE END ADC1_Init 0 */

 ADC_ChannelConfTypeDef sConfig = {0};

 /* USER CODE BEGIN ADC1_Init 1 */

 /* USER CODE END ADC1_Init 1 */

 /** Configure the global features of the ADC (Clock, Resolution, Data Alignment and number of conversion)
 */
 hadc1.Instance = ADC1;
 hadc1.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV1;
 hadc1.Init.Resolution = ADC_RESOLUTION_12B;
 hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
 hadc1.Init.ScanConvMode = ADC_SCAN_SEQ_FIXED;
 hadc1.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
 hadc1.Init.LowPowerAutoWait = DISABLE;
 hadc1.Init.LowPowerAutoPowerOff = DISABLE;
 hadc1.Init.ContinuousConvMode = DISABLE;
 hadc1.Init.NbrOfConversion = 1;
 hadc1.Init.DiscontinuousConvMode = DISABLE;
 hadc1.Init.ExternalTrigConv = ADC_SOFTWARE_START;
 hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
 hadc1.Init.DMAContinuousRequests = DISABLE;
 hadc1.Init.Overrun = ADC_OVR_DATA_PRESERVED;
 hadc1.Init.SamplingTimeCommon1 = ADC_SAMPLETIME_1CYCLE_5;
 hadc1.Init.OversamplingMode = DISABLE;
 hadc1.Init.TriggerFrequencyMode = ADC_TRIGGER_FREQ_HIGH;
 if (HAL_ADC_Init(&hadc1) != HAL_OK)
 {
 Error_Handler();
 }

 /** Configure Regular Channel
 */
 sConfig.Channel = ADC_CHANNEL_2;
 sConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
 if (HAL_ADC_ConfigChannel(&hadc1, &sConfig) != HAL_OK)
 {
 Error_Handler();
 }
 /* USER CODE BEGIN ADC1_Init 2 */

 /* USER CODE END ADC1_Init 2 */

}

/**
 * @brief I2C1 Initialization Function
 * None
 * @retval None
 */
static void MX_I2C1_Init(void)
{

 /* USER CODE BEGIN I2C1_Init 0 */

 /* USER CODE END I2C1_Init 0 */

 /* USER CODE BEGIN I2C1_Init 1 */

 /* USER CODE END I2C1_Init 1 */
 hi2c1.Instance = I2C1;
 hi2c1.Init.Timing = 0x00402D41;
 hi2c1.Init.OwnAddress1 = 0;
 hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
 hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
 hi2c1.Init.OwnAddress2 = 0;
 hi2c1.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
 hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
 hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
 if (HAL_I2C_Init(&hi2c1) != HAL_OK)
 {
 Error_Handler();
 }

 /** Configure Analogue filter
 */
 if (HAL_I2CEx_ConfigAnalogFilter(&hi2c1, I2C_ANALOGFILTER_ENABLE) != HAL_OK)
 {
 Error_Handler();
 }

 /** Configure Digital filter
 */
 if (HAL_I2CEx_ConfigDigitalFilter(&hi2c1, 0) != HAL_OK)
 {
 Error_Handler();
 }
 /* USER CODE BEGIN I2C1_Init 2 */

 /* USER CODE END I2C1_Init 2 */

}

/**
 * @brief TIM3 Initialization Function
 * None
 * @retval None
 */
static void MX_TIM3_Init(void)
{

 /* USER CODE BEGIN TIM3_Init 0 */

 /* USER CODE END TIM3_Init 0 */

 TIM_ClockConfigTypeDef sClockSourceConfig = {0};
 TIM_MasterConfigTypeDef sMasterConfig = {0};
 TIM_OC_InitTypeDef sConfigOC = {0};

 /* USER CODE BEGIN TIM3_Init 1 */

 /* USER CODE END TIM3_Init 1 */
 htim3.Instance = TIM3;
 htim3.Init.Prescaler = 0;
 htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
 htim3.Init.Period = 500;
 htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
 htim3.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
 if (HAL_TIM_Base_Init(&htim3) != HAL_OK)
 {
 Error_Handler();
 }
 sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
 if (HAL_TIM_ConfigClockSource(&htim3, &sClockSourceConfig) != HAL_OK)
 {
 Error_Handler();
 }
 if (HAL_TIM_PWM_Init(&htim3) != HAL_OK)
 {
 Error_Handler();
 }
 sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
 sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
 if (HAL_TIMEx_MasterConfigSynchronization(&htim3, &sMasterConfig) != HAL_OK)
 {
 Error_Handler();
 }
 sConfigOC.OCMode = TIM_OCMODE_PWM1;
 sConfigOC.Pulse = 250;
 sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
 sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
 if (HAL_TIM_PWM_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_1) != HAL_OK)
 {
 Error_Handler();
 }
 /* USER CODE BEGIN TIM3_Init 2 */

 HAL_TIM_RegisterCallback(&htim3, HAL_TIM_PWM_PULSE_FINISHED_CB_ID, User_PWM_PulseFinishedCallback);

 /* USER CODE END TIM3_Init 2 */
 HAL_TIM_MspPostInit(&htim3);

}

/**
 * @brief TIM16 Initialization Function
 * None
 * @retval None
 */
static void MX_TIM16_Init(void)
{

 /* USER CODE BEGIN TIM16_Init 0 */

 /* USER CODE END TIM16_Init 0 */

 /* USER CODE BEGIN TIM16_Init 1 */

 /* USER CODE END TIM16_Init 1 */
 htim16.Instance = TIM16;
 htim16.Init.Prescaler = 12000;
 htim16.Init.CounterMode = TIM_COUNTERMODE_UP;
 htim16.Init.Period = 10000;
 htim16.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
 htim16.Init.RepetitionCounter = 0;
 htim16.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_ENABLE;
 if (HAL_TIM_Base_Init(&htim16) != HAL_OK)
 {
 Error_Handler();
 }
 /* USER CODE BEGIN TIM16_Init 2 */

 /* USER CODE END TIM16_Init 2 */

}

/**
 * @brief USART1 Initialization Function
 * None
 * @retval None
 */
static void MX_USART1_UART_Init(void)
{

 /* USER CODE BEGIN USART1_Init 0 */

 /* USER CODE END USART1_Init 0 */

 /* USER CODE BEGIN USART1_Init 1 */

 /* USER CODE END USART1_Init 1 */
 huart1.Instance = USART1;
 huart1.Init.BaudRate = 9600;
 huart1.Init.WordLength = UART_WORDLENGTH_8B;
 huart1.Init.StopBits = UART_STOPBITS_1;
 huart1.Init.Parity = UART_PARITY_NONE;
 huart1.Init.Mode = UART_MODE_TX_RX;
 huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
 huart1.Init.OverSampling = UART_OVERSAMPLING_16;
 huart1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
 huart1.Init.ClockPrescaler = UART_PRESCALER_DIV1;
 huart1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
 if (HAL_UART_Init(&huart1) != HAL_OK)
 {
 Error_Handler();
 }
 if (HAL_UARTEx_SetTxFifoThreshold(&huart1, UART_TXFIFO_THRESHOLD_1_8) != HAL_OK)
 {
 Error_Handler();
 }
 if (HAL_UARTEx_SetRxFifoThreshold(&huart1, UART_RXFIFO_THRESHOLD_1_8) != HAL_OK)
 {
 Error_Handler();
 }
 if (HAL_UARTEx_DisableFifoMode(&huart1) != HAL_OK)
 {
 Error_Handler();
 }
 /* USER CODE BEGIN USART1_Init 2 */

 /* USER CODE END USART1_Init 2 */

}

/**
 * @brief GPIO Initialization Function
 * None
 * @retval None
 */
static void MX_GPIO_Init(void)
{
 GPIO_InitTypeDef GPIO_InitStruct = {0};
 /* USER CODE BEGIN MX_GPIO_Init_1 */

 /* USER CODE END MX_GPIO_Init_1 */

 /* GPIO Ports Clock Enable */
 __HAL_RCC_GPIOC_CLK_ENABLE();
 __HAL_RCC_GPIOF_CLK_ENABLE();
 __HAL_RCC_GPIOA_CLK_ENABLE();
 __HAL_RCC_GPIOB_CLK_ENABLE();
 __HAL_RCC_GPIOD_CLK_ENABLE();

 /*Configure GPIO pin Output Level */
 HAL_GPIO_WritePin(GPIOB, OUT_PRESSURE_ERROR_Pin|OUT_PRESSURE_OK_Pin|DISP_SDI_Pin|LED4_Pin
 |LED5_Pin, GPIO_PIN_RESET);

 /*Configure GPIO pin Output Level */
 HAL_GPIO_WritePin(GPIOA, DISP_LA_Pin|DISP_OE_Pin|DISP_DIGIT4_Pin|DISP_DIGIT1_Pin
 |DISP_DIGIT2_Pin, GPIO_PIN_RESET);

 /*Configure GPIO pin Output Level */
 HAL_GPIO_WritePin(DISP_DIGIT3_GPIO_Port, DISP_DIGIT3_Pin, GPIO_PIN_RESET);

 /*Configure GPIO pin Output Level */
 HAL_GPIO_WritePin(GPIOD, LED1_Pin|LED2_Pin|LED3_Pin, GPIO_PIN_RESET);

 /*Configure GPIO pins : OUT_PRESSURE_ERROR_Pin OUT_PRESSURE_OK_Pin LED4_Pin LED5_Pin */
 GPIO_InitStruct.Pin = OUT_PRESSURE_ERROR_Pin|OUT_PRESSURE_OK_Pin|LED4_Pin|LED5_Pin;
 GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
 HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

 /*Configure GPIO pins : IN_MODE2_Pin IN_MODE1_Pin */
 GPIO_InitStruct.Pin = IN_MODE2_Pin|IN_MODE1_Pin;
 GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

 /*Configure GPIO pin : DISP_SDI_Pin */
 GPIO_InitStruct.Pin = DISP_SDI_Pin;
 GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
 HAL_GPIO_Init(DISP_SDI_GPIO_Port, &GPIO_InitStruct);

 /*Configure GPIO pins : DISP_LA_Pin DISP_OE_Pin DISP_DIGIT4_Pin DISP_DIGIT1_Pin
 DISP_DIGIT2_Pin */
 GPIO_InitStruct.Pin = DISP_LA_Pin|DISP_OE_Pin|DISP_DIGIT4_Pin|DISP_DIGIT1_Pin
 |DISP_DIGIT2_Pin;
 GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
 HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

 /*Configure GPIO pin : DISP_DIGIT3_Pin */
 GPIO_InitStruct.Pin = DISP_DIGIT3_Pin;
 GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
 HAL_GPIO_Init(DISP_DIGIT3_GPIO_Port, &GPIO_InitStruct);

 /*Configure GPIO pins : LED1_Pin LED2_Pin LED3_Pin */
 GPIO_InitStruct.Pin = LED1_Pin|LED2_Pin|LED3_Pin;
 GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
 HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);

 /*Configure GPIO pins : BTN1_Pin BTN2_Pin BTN3_Pin */
 GPIO_InitStruct.Pin = BTN1_Pin|BTN2_Pin|BTN3_Pin;
 GPIO_InitStruct.Mode = GPIO_MODE_IT_FALLING;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

 /* EXTI interrupt init*/
 HAL_NVIC_SetPriority(EXTI4_15_IRQn, 0, 0);
 HAL_NVIC_EnableIRQ(EXTI4_15_IRQn);

 /* USER CODE BEGIN MX_GPIO_Init_2 */

 /* USER CODE END MX_GPIO_Init_2 */
}

/* USER CODE BEGIN 4 */
// Redirect printf to UART1
PUTCHAR_PROTOTYPE
{
	HAL_UART_Transmit(&huart1, (uint8_t *)&ch, 1, 0xFFFF);

	return ch;
}

/* USER CODE END 4 */

/**
 * @brief This function is executed in case of error occurrence.
 * @retval None
 */
void Error_Handler(void)
{
 /* USER CODE BEGIN Error_Handler_Debug */
 /* User can add his own implementation to report the HAL error return state */
	printf("Error handler! Disable interrupts\n");
 __disable_irq();
 while (1)
 {
 }
 /* USER CODE END Error_Handler_Debug */
}
#ifdef USE_FULL_ASSERT
/**
 * @brief Reports the name of the source file and the source line number
 * where the assert_param error has occurred.
 * file: pointer to the source file name
 * line: assert_param error line source number
 * @retval None
 */
void assert_failed(uint8_t *file, uint32_t line)
{
 /* USER CODE BEGIN 6 */
 /* User can add his own implementation to report the file name and line number,
 ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
 /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */

 

in stm32c0xx_it.c I can find:

void EXTI4_15_IRQHandler(void)
{
 /* USER CODE BEGIN EXTI4_15_IRQn 0 */
 printf("EXTI IRQ Handler");


 /* USER CODE END EXTI4_15_IRQn 0 */
 HAL_GPIO_EXTI_IRQHandler(BTN1_Pin);
 HAL_GPIO_EXTI_IRQHandler(BTN2_Pin);
 HAL_GPIO_EXTI_IRQHandler(BTN3_Pin);
 /* USER CODE BEGIN EXTI4_15_IRQn 1 */

 /* USER CODE END EXTI4_15_IRQn 1 */
}

After MX_GPIO_Init(); I can see that EXTI_FTSR1 register is changed.

What could be wrong?

 

[Andrew Neil]

---

@MLemb.2 wrote:

I'm coding board based on STM32 C031C6T6.

---

What board?

Please give details - see: How to write your question to maximize your chances to find a solution

 

---

@MLemb.2 wrote:

I checked signals on hardware -

---

How, exactly, did you do that?

Can you correctly read the states of the pins using them just as plain GPIO inputs?

[MLemb.2]

---

@Andrew Neil wrote:

---

@MLemb.2 wrote:

I'm coding board based on STM32 C031C6T6.

---

What board?

---

My custom board.

Button debouncing circuit:

I use LSE crystal and HSI.

 

 

---

@Andrew Neil wrote:

---

@MLemb.2 wrote:

I checked signals on hardware -

---

How, exactly, did you do that?

Can you correctly read the states of the pins using them just as plain GPIO inputs?

---

I checked signals using oscilloscope on stm pins.

They work fine as standard GPIO.

 

[TDK]

Can you show the board schematic? Does the button actually pull down the pin?

Code seems fine.

How are you determining that these are not firing? Debugging and using breakpoints would work.

Generally shouldn't put blocking functions within an interrupt.

[MLemb.2]

I checked it using breakpoints and I founded problem:

HAL_GPIO_EXTI_Callback

Should be:

HAL_GPIO_EXTI_Falling_Callback

EXTI4_15_IRQHandler was fired properly.

Thank you for help @TDK @Andrew Neil