GPIO_EXTI
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Outline
Includes
#include "main.h"
Private function prototypes
main()
SystemClock_Config()
EXTI0_IRQHandler_Config()
HAL_GPIO_EXTI_Callback(uint16_t)
Files
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SourceVuSTM32 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 EXTI0_IRQHandler_Config(void);Private function prototypes /* Private functions ---------------------------------------------------------*/ /** * @brief Main program * @param None * @retval None *//* ... */ int main(void) { /* STM32F4xx HAL library initialization: - Configure the Flash prefetch, instruction and Data caches - Systick timer is configured by default as source of time base, but user can eventually implement his proper time base source (a general purpose timer for example or other time source), keeping in mind that Time base duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and handled in milliseconds basis. - Set NVIC Group Priority to 4 - Low Level Initialization: global MSP (MCU Support Package) initialization *//* ... */ HAL_Init(); /* Configure the system clock to 180 MHz */ SystemClock_Config(); /* -1- Initialize LEDs mounted on STM32469I-DISCOVERY board */ BSP_LED_Init(LED1); /* -2- Configure EXTI0 (connected to PA.00 pin) in interrupt mode */ EXTI0_IRQHandler_Config(); /* Infinite loop */ while (1) { }while (1) { ... } }{ ... } /** * @brief System Clock Configuration * The system Clock is configured as follow : * System Clock source = PLL (HSE) * SYSCLK(Hz) = 180000000 * HCLK(Hz) = 180000000 * AHB Prescaler = 1 * APB1 Prescaler = 4 * APB2 Prescaler = 2 * HSE Frequency(Hz) = 8000000 * PLL_M = 8 * PLL_N = 360 * PLL_P = 2 * PLL_Q = 7 * PLL_R = 6 * VDD(V) = 3.3 * Main regulator output voltage = Scale1 mode * Flash Latency(WS) = 5 * @param None * @retval None *//* ... */ static void SystemClock_Config(void) { RCC_ClkInitTypeDef RCC_ClkInitStruct; RCC_OscInitTypeDef RCC_OscInitStruct; HAL_StatusTypeDef ret = HAL_OK; /* 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 HSE Oscillator and activate PLL with HSE as source */ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE; RCC_OscInitStruct.HSEState = RCC_HSE_ON; RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON; RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE; #if defined(USE_STM32469I_DISCO_REVA) RCC_OscInitStruct.PLL.PLLM = 25; #else RCC_OscInitStruct.PLL.PLLM = 8; #endif /* USE_STM32469I_DISCO_REVA */ RCC_OscInitStruct.PLL.PLLN = 360; RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2; RCC_OscInitStruct.PLL.PLLQ = 7; RCC_OscInitStruct.PLL.PLLR = 6; ret = HAL_RCC_OscConfig(&RCC_OscInitStruct); if(ret != HAL_OK) { while(1) { ; } }if (ret != HAL_OK) { ... } /* Activate the OverDrive to reach the 180 MHz Frequency */ ret = HAL_PWREx_EnableOverDrive(); if(ret != HAL_OK) { while(1) { ; } }if (ret != 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_DIV4; RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2; ret = HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5); if(ret != HAL_OK) { while(1) { ; } }if (ret != HAL_OK) { ... } }{ ... } /** * @brief Configures EXTI line 0 (connected to PA.00 pin) in interrupt mode * @param None * @retval None *//* ... */ static void EXTI0_IRQHandler_Config(void) { GPIO_InitTypeDef GPIO_InitStructure; /* Enable GPIOA clock */ __HAL_RCC_GPIOA_CLK_ENABLE(); /* Configure PA.00 pin as input floating */ GPIO_InitStructure.Mode = GPIO_MODE_IT_RISING; GPIO_InitStructure.Pull = GPIO_NOPULL; GPIO_InitStructure.Pin = GPIO_PIN_0; HAL_GPIO_Init(GPIOA, &GPIO_InitStructure); /* Enable and set EXTI line 0 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 == GPIO_PIN_0) { /* Toggle LED1 */ BSP_LED_Toggle(LED1); }if (GPIO_Pin == GPIO_PIN_0) { ... } }{ ... } #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 /** * @} *//* ... */ /** * @} *//* ... */
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