GPIO_EXTI
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Outline
Includes
#include "main.h"
Private function prototypes
main()
SystemClock_Config()
EXTILine0_Config()
HAL_GPIO_EXTI_Callback(uint16_t)
Error_Handler()
Files
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CodeScopeSTM32 Libraries and SamplesGPIO_EXTISrc/main.c
 
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/** ****************************************************************************** * @file GPIO/GPIO_EXTI/Src/main.c * @author MCD Application Team * @brief This example describes how to configure and use GPIOs through * the STM32F4xx HAL API. ****************************************************************************** * @attention * * Copyright (c) 2017 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. * ****************************************************************************** *//* ... */ /* Includes ------------------------------------------------------------------*/ #include "main.h" /** @addtogroup STM32F4xx_HAL_Examples * @{ *//* ... */ /** @addtogroup GPIO_EXTI * @{ *//* ... */ Includes /* Private typedef -----------------------------------------------------------*/ /* Private define ------------------------------------------------------------*/ /* Private macro -------------------------------------------------------------*/ /* Private variables ---------------------------------------------------------*/ /* Private function prototypes -----------------------------------------------*/ static void SystemClock_Config(void); static void Error_Handler(void); static void EXTILine0_Config(void); Private function prototypes /* Private functions ---------------------------------------------------------*/ /** * @brief Main program * @param None * @retval None *//* ... */ int main(void) { /* This sample code shows how to use STM32F4xx GPIO HAL API to toggle PD12, PD13, PD14, and PD14 IOs (connected to LED4, LED3, LED5 and LED6 on STM32F411E-DISCO board (MB1115B)) in an infinite loop. To proceed, 3 steps are required: *//* ... */ /* STM32F4xx HAL library initialization: - Configure the Flash prefetch, instruction and Data caches - Configure the Systick to generate an interrupt each 1 msec - Set NVIC Group Priority to 4 - Global MSP (MCU Support Package) initialization *//* ... */ HAL_Init(); /* Configure LED3, LED4, LED5 and LED6 */ BSP_LED_Init(LED3); BSP_LED_Init(LED4); BSP_LED_Init(LED5); BSP_LED_Init(LED6); /* Configure the system clock to 100 MHz */ SystemClock_Config(); /* Configure EXTI Line0 (connected to PA0 pin) in interrupt mode */ EXTILine0_Config(); /* Infinite loop */ while (1) { }while (1) { ... } }{ ... } /** * @brief System Clock Configuration * The system Clock is configured as follow : * System Clock source = PLL (HSI) * SYSCLK(Hz) = 100000000 * HCLK(Hz) = 100000000 * AHB Prescaler = 1 * APB1 Prescaler = 2 * APB2 Prescaler = 1 * HSI Frequency(Hz) = 16000000 * PLL_M = 16 * PLL_N = 400 * PLL_P = 4 * PLL_Q = 7 * VDD(V) = 3.3 * Main regulator output voltage = Scale1 mode * Flash Latency(WS) = 3 * @param None * @retval None *//* ... */ static void SystemClock_Config(void) { RCC_ClkInitTypeDef RCC_ClkInitStruct; RCC_OscInitTypeDef RCC_OscInitStruct; /* Enable Power Control clock */ __HAL_RCC_PWR_CLK_ENABLE(); /* The voltage scaling allows optimizing the power consumption when the device is clocked below the maximum system frequency, to update the voltage scaling value regarding system frequency refer to product datasheet. *//* ... */ __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1); /* Enable HSI Oscillator and activate PLL with HSI as source */ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI; RCC_OscInitStruct.HSIState = RCC_HSI_ON; RCC_OscInitStruct.HSICalibrationValue = 0x10; RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON; RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI; RCC_OscInitStruct.PLL.PLLM = 16; RCC_OscInitStruct.PLL.PLLN = 400; RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4; RCC_OscInitStruct.PLL.PLLQ = 7; if(HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { Error_Handler(); }if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) { ... } /* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers *//* ... */ RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2); RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2; RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1; if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_3) != HAL_OK) { Error_Handler(); }if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_3) != HAL_OK) { ... } }{ ... } /** * @brief Configures EXTI Line0 (connected to PA0 pin) in interrupt mode * @param None * @retval None *//* ... */ static void EXTILine0_Config(void) { GPIO_InitTypeDef GPIO_InitStructure; /* Enable GPIOA clock */ __HAL_RCC_GPIOA_CLK_ENABLE(); /* Configure PA0 pin as input floating */ GPIO_InitStructure.Mode = GPIO_MODE_IT_FALLING; GPIO_InitStructure.Pull = GPIO_NOPULL; GPIO_InitStructure.Pin = GPIO_PIN_0; HAL_GPIO_Init(GPIOA, &GPIO_InitStructure); /* Enable and set EXTI Line0 Interrupt to the lowest priority */ HAL_NVIC_SetPriority(EXTI0_IRQn, 2, 0); HAL_NVIC_EnableIRQ(EXTI0_IRQn); }{ ... } /** * @brief EXTI line detection callbacks * @param GPIO_Pin: Specifies the pins connected EXTI line * @retval None *//* ... */ void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin) { if(GPIO_Pin == KEY_BUTTON_PIN) { /* Toggle LED3 */ BSP_LED_Toggle(LED3); /* Toggle LED4 */ BSP_LED_Toggle(LED4); /* Toggle LED5 */ BSP_LED_Toggle(LED5); /* Toggle LED6 */ BSP_LED_Toggle(LED6); }if (GPIO_Pin == KEY_BUTTON_PIN) { ... } }{ ... } /** * @brief This function is executed in case of error occurrence. * @param None * @retval None *//* ... */ static void Error_Handler(void) { /* Turn LED5 on */ BSP_LED_On(LED5); while(1) { }while (1) { ... } }{ ... } #ifdef USE_FULL_ASSERT /** * @brief Reports the name of the source file and the source line number * where the assert_param error has occurred. * @param file: pointer to the source file name * @param line: assert_param error line source number * @retval None *//* ... */ void assert_failed(uint8_t* file, uint32_t line) { /* 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) *//* ... */ /* Infinite loop */ while (1) { }while (1) { ... } }assert_failed (uint8_t* file, uint32_t line) { ... } /* ... */#endif /** * @} *//* ... */ /** * @} *//* ... */