STM32F0xx_StdPeriph_Examples/EXTI/EXTI_Example/main.c

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/**
  ******************************************************************************
  * @file    EXTI/EXTI_Example/main.c
  * @author  MCD Application Team
  * @version V1.4.0
  * @date    24-July-2014
  * @brief   Main program body
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT 2014 STMicroelectronics</center></h2>
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software 
  * distributed under the License is distributed on an "AS IS" BASIS, 
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "main.h"

/** @addtogroup STM32F0xx_StdPeriph_Examples
  * @{
  */

/** @addtogroup EXTI_Example
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
EXTI_InitTypeDef   EXTI_InitStructure;
GPIO_InitTypeDef   GPIO_InitStructure;
NVIC_InitTypeDef   NVIC_InitStructure;

/* Private function prototypes -----------------------------------------------*/
static void EXTI0_Config(void);
#ifdef USE_STM32072B_EVAL 
static void EXTI2_3_Config(void);
#endif
static void EXTI4_15_Config(void);

/* Private functions ---------------------------------------------------------*/

/**
  * @brief  Main program.
  * @param  None
  * @retval None
  */
int main(void)
{
  /*!< At this stage the microcontroller clock setting is already configured, 
       this is done through SystemInit() function which is called from startup
       file (startup_stm32f0xx.s) before to branch to application main.
       To reconfigure the default setting of SystemInit() function, refer to
       system_stm32f0xx.c file
     */

  /* Initialize LEDs mounted on EVAL board */
  STM_EVAL_LEDInit(LED1);
  STM_EVAL_LEDInit(LED2);
  STM_EVAL_LEDInit(LED3);
  STM_EVAL_LEDInit(LED4);

  /* Configure PA0 in interrupt mode */
  EXTI0_Config();

  /* Configure PE3, PE2 in interrupt mode only for STM32072B devices*/  
#ifdef USE_STM32072B_EVAL
  EXTI2_3_Config();
#endif
  
  /* Configure PC13 in interrupt mode */
  EXTI4_15_Config();

  /* Generate software interrupt: simulate a falling edge applied on EXTI8 line */
  EXTI_GenerateSWInterrupt(EXTI_Line8);

  /* Infinite loop */
  while (1)
  {
  }
}

/**
  * @brief  Configure PA0 in interrupt mode
  * @param  None
  * @retval None
  */
static void EXTI0_Config(void)
{
  /* Enable GPIOA clock */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);

  /* Configure PA0 pin as input floating */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  /* Enable SYSCFG clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
  /* Connect EXTI0 Line to PA0 pin */
  SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource0);

  /* Configure EXTI0 line */
  EXTI_InitStructure.EXTI_Line = EXTI_Line0;
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);

  /* Enable and set EXTI0 Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = EXTI0_1_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPriority = 0x00;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}

/**
  * @brief  Configure PE3, PE0in interrupt mode
  * @param  None
  * @retval None
  */
#ifdef USE_STM32072B_EVAL 
static void EXTI2_3_Config(void)
{
  /* Enable GPIOE clock */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOE, ENABLE);

  /* Configure PE3 and PE2 pins as input floating */
  
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2|GPIO_Pin_3;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN;
  GPIO_Init(GPIOE, &GPIO_InitStructure);

  /* Enable SYSCFG clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);

  /* Connect EXTI3 Line to PE3 pin */
  SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOE, EXTI_PinSource3);

  /* Connect EXTI2 Line to PE2 pin */
  SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOE, EXTI_PinSource2);

  /* Configure EXTI3 line */
  EXTI_InitStructure.EXTI_Line = EXTI_Line3;
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);

  /* Configure EXTI2 line */
  EXTI_InitStructure.EXTI_Line = EXTI_Line2;
  EXTI_Init(&EXTI_InitStructure);

  /* Enable and set EXTI2_3 Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = EXTI2_3_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPriority = 0x00;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

}
#endif

/**
  * @brief  Configure PC13 in interrupt mode
  * @param  None
  * @retval None
  */
static void EXTI4_15_Config(void)
{
  /* Enable GPIOC clock */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC, ENABLE);

  /* Enable SYSCFG clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);

#ifdef USE_STM320518_EVAL 
  /* Configure PC9 pin as input floating */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(GPIOC, &GPIO_InitStructure);
  
  /* Connect EXTI9 Line to PC9 pin */
  SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOC, EXTI_PinSource9);
  
  /* Configure EXTI9 line */
  EXTI_InitStructure.EXTI_Line = EXTI_Line9;
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);

#endif
  
  /* Configure PC8 and PC13 pins as input floating */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8|GPIO_Pin_13;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(GPIOC, &GPIO_InitStructure);
  
   /* Connect EXTI8 Line to PC8 pin */
  SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOC, EXTI_PinSource8);
  
  /* Connect EXTI13 Line to PC13 pin */
  SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOC, EXTI_PinSource13);
  
  /* Configure EXTI8 line */
  EXTI_InitStructure.EXTI_Line = EXTI_Line8;  
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  EXTI_Init(&EXTI_InitStructure);
  
  /* Configure EXTI13 line */
  EXTI_InitStructure.EXTI_Line = EXTI_Line13;
  EXTI_Init(&EXTI_InitStructure);
  
  /* Enable and set EXTI4_15 Interrupt */
  NVIC_InitStructure.NVIC_IRQChannel = EXTI4_15_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPriority = 0x00;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

}
#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)
  {
  }
}
#endif

/**
  * @}
  */

/**
  * @}
  */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/