Diff: targets/cmsis/TARGET_STM/TARGET_NUCLEO_L152RE/stm32l1xx_exti.c

Revision:

76:aeb1df146756

Child:

80:66393a7b209d

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/cmsis/TARGET_STM/TARGET_NUCLEO_L152RE/stm32l1xx_exti.c	Mon Jan 27 14:30:07 2014 +0000
@@ -0,0 +1,315 @@
+/**
+  ******************************************************************************
+  * @file    stm32l1xx_exti.c
+  * @author  MCD Application Team
+  * @version V1.2.0
+  * @date    22-February-2013
+  * @brief   This file provides firmware functions to manage the following 
+  *          functionalities of the EXTI peripheral:           
+  *           + Initialization and Configuration
+  *           + Interrupts and flags management
+  *
+  *  @verbatim  
+  ============================================================================== 
+                            ##### EXTI features ##### 
+  ============================================================================== 
+    [..] External interrupt/event lines are mapped as following:
+         (#) All available GPIO pins are connected to the 16 external 
+             interrupt/event lines from EXTI0 to EXTI15.
+         (#) EXTI line 16 is connected to the PVD output.
+         (#) EXTI line 17 is connected to the RTC Alarm event.
+         (#) EXTI line 18 is connected to the USB Device FS wakeup event.
+         (#) EXTI line 19 is connected to the RTC Tamper and TimeStamp events.
+         (#) EXTI line 20 is connected to the RTC Wakeup event.
+         (#) EXTI line 21 is connected to the Comparator 1 wakeup event.
+         (#) EXTI line 22 is connected to the Comparator 2 wakeup event.
+         (#) EXTI line 23 is connected to the Comparator channel acquisition wakeup event.
+         
+            
+                       ##### How to use this driver ##### 
+  ==============================================================================   
+    [..] In order to use an I/O pin as an external interrupt source, follow
+         steps below:
+    (#) Configure the I/O in input mode using GPIO_Init()
+    (#) Select the input source pin for the EXTI line using 
+        SYSCFG_EXTILineConfig()
+    (#) Select the mode(interrupt, event) and configure the trigger 
+        selection (Rising, falling or both) using EXTI_Init()
+    (#) Configure NVIC IRQ channel mapped to the EXTI line using NVIC_Init()
+    [..]
+	(@) SYSCFG APB clock must be enabled to get write access to SYSCFG_EXTICRx
+      registers using RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
+            
+  *  @endverbatim                  
+  *
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT 2013 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 "stm32l1xx_exti.h"
+
+/** @addtogroup STM32L1xx_StdPeriph_Driver
+  * @{
+  */
+
+/** @defgroup EXTI 
+  * @brief EXTI driver modules
+  * @{
+  */
+
+/* Private typedef -----------------------------------------------------------*/
+/* Private define ------------------------------------------------------------*/
+#define EXTI_LINENONE    ((uint32_t)0x00000)  /* No interrupt selected */
+
+/* Private macro -------------------------------------------------------------*/
+/* Private variables ---------------------------------------------------------*/
+/* Private function prototypes -----------------------------------------------*/
+/* Private functions ---------------------------------------------------------*/
+
+/** @defgroup EXTI_Private_Functions
+  * @{
+  */
+
+/** @defgroup EXTI_Group1 Initialization and Configuration functions
+ *  @brief   Initialization and Configuration functions 
+ *
+@verbatim   
+  ==============================================================================
+            ##### Initialization and Configuration functions #####
+  ==============================================================================  
+
+@endverbatim
+  * @{
+  */
+
+/**
+  * @brief  Deinitializes the EXTI peripheral registers to their default reset values.
+  * @param  None
+  * @retval None
+  */
+void EXTI_DeInit(void)
+{
+  EXTI->IMR = 0x00000000;
+  EXTI->EMR = 0x00000000;
+  EXTI->RTSR = 0x00000000; 
+  EXTI->FTSR = 0x00000000; 
+  EXTI->PR = 0x00FFFFFF;
+}
+
+/**
+  * @brief  Initializes the EXTI peripheral according to the specified
+  *   parameters in the EXTI_InitStruct.
+  *    EXTI_Line specifies the EXTI line (EXTI0....EXTI23).
+  *    EXTI_Mode specifies which EXTI line is used as interrupt or an event.
+  *    EXTI_Trigger selects the trigger. When the trigger occurs, interrupt
+  *                 pending bit will be set.
+  *    EXTI_LineCmd controls (Enable/Disable) the EXTI line.
+  * @param  EXTI_InitStruct: pointer to a EXTI_InitTypeDef structure
+  *   that contains the configuration information for the EXTI peripheral.
+  * @retval None
+  */
+void EXTI_Init(EXTI_InitTypeDef* EXTI_InitStruct)
+{
+  uint32_t tmp = 0;
+
+  /* Check the parameters */
+  assert_param(IS_EXTI_MODE(EXTI_InitStruct->EXTI_Mode));
+  assert_param(IS_EXTI_TRIGGER(EXTI_InitStruct->EXTI_Trigger));
+  assert_param(IS_EXTI_LINE(EXTI_InitStruct->EXTI_Line));  
+  assert_param(IS_FUNCTIONAL_STATE(EXTI_InitStruct->EXTI_LineCmd));
+
+  tmp = (uint32_t)EXTI_BASE;
+     
+  if (EXTI_InitStruct->EXTI_LineCmd != DISABLE)
+  {
+    /* Clear EXTI line configuration */
+    EXTI->IMR &= ~EXTI_InitStruct->EXTI_Line;
+    EXTI->EMR &= ~EXTI_InitStruct->EXTI_Line;
+    
+    tmp += EXTI_InitStruct->EXTI_Mode;
+
+    *(__IO uint32_t *) tmp |= EXTI_InitStruct->EXTI_Line;
+
+    /* Clear Rising Falling edge configuration */
+    EXTI->RTSR &= ~EXTI_InitStruct->EXTI_Line;
+    EXTI->FTSR &= ~EXTI_InitStruct->EXTI_Line;
+    
+    /* Select the trigger for the selected external interrupts */
+    if (EXTI_InitStruct->EXTI_Trigger == EXTI_Trigger_Rising_Falling)
+    {
+      /* Rising Falling edge */
+      EXTI->RTSR |= EXTI_InitStruct->EXTI_Line;
+      EXTI->FTSR |= EXTI_InitStruct->EXTI_Line;
+    }
+    else
+    {
+      tmp = (uint32_t)EXTI_BASE;
+      tmp += EXTI_InitStruct->EXTI_Trigger;
+
+      *(__IO uint32_t *) tmp |= EXTI_InitStruct->EXTI_Line;
+    }
+  }
+  else
+  {
+    tmp += EXTI_InitStruct->EXTI_Mode;
+
+    /* Disable the selected external lines */
+    *(__IO uint32_t *) tmp &= ~EXTI_InitStruct->EXTI_Line;
+  }
+}
+
+/**
+  * @brief  Fills each EXTI_InitStruct member with its reset value.
+  * @param  EXTI_InitStruct: pointer to a EXTI_InitTypeDef structure which will
+  *   be initialized.
+  * @retval None
+  */
+void EXTI_StructInit(EXTI_InitTypeDef* EXTI_InitStruct)
+{
+  EXTI_InitStruct->EXTI_Line = EXTI_LINENONE;
+  EXTI_InitStruct->EXTI_Mode = EXTI_Mode_Interrupt;
+  EXTI_InitStruct->EXTI_Trigger = EXTI_Trigger_Falling;
+  EXTI_InitStruct->EXTI_LineCmd = DISABLE;
+}
+
+/**
+  * @brief  Generates a Software interrupt on selected EXTI line.
+  * @param  EXTI_Line: specifies the EXTI line on which the software interrupt
+  *         will be generated.
+  *   This parameter can be any combination of EXTI_Linex where x can be (0..23).
+  * @retval None
+  */
+void EXTI_GenerateSWInterrupt(uint32_t EXTI_Line)
+{
+  /* Check the parameters */
+  assert_param(IS_EXTI_LINE(EXTI_Line));
+  
+  EXTI->SWIER |= EXTI_Line;
+}
+
+/**
+  * @}
+  */
+
+/** @defgroup EXTI_Group2 Interrupts and flags management functions
+ *  @brief   Interrupts and flags management functions 
+ *
+@verbatim   
+  ==============================================================================
+             ##### Interrupts and flags management functions #####
+  ============================================================================== 
+  
+@endverbatim
+  * @{
+  */
+
+/**
+  * @brief  Checks whether the specified EXTI line flag is set or not.
+  * @param  EXTI_Line: specifies the EXTI line flag to check.
+  *   This parameter can be:
+  *   EXTI_Linex: External interrupt line x where x(0..23).
+  * @retval The new state of EXTI_Line (SET or RESET).
+  */
+FlagStatus EXTI_GetFlagStatus(uint32_t EXTI_Line)
+{
+  FlagStatus bitstatus = RESET;
+  /* Check the parameters */
+  assert_param(IS_GET_EXTI_LINE(EXTI_Line));
+  
+  if ((EXTI->PR & EXTI_Line) != (uint32_t)RESET)
+  {
+    bitstatus = SET;
+  }
+  else
+  {
+    bitstatus = RESET;
+  }
+  return bitstatus;
+}
+
+/**
+  * @brief  Clears the EXTI's line pending flags.
+  * @param  EXTI_Line: specifies the EXTI lines flags to clear.
+  *   This parameter can be any combination of EXTI_Linex where x can be (0..23).
+  * @retval None
+  */
+void EXTI_ClearFlag(uint32_t EXTI_Line)
+{
+  /* Check the parameters */
+  assert_param(IS_EXTI_LINE(EXTI_Line));
+  
+  EXTI->PR = EXTI_Line;
+}
+
+/**
+  * @brief  Checks whether the specified EXTI line is asserted or not.
+  * @param  EXTI_Line: specifies the EXTI line to check.
+  *   This parameter can be:
+  *   EXTI_Linex: External interrupt line x where x(0..23).
+  * @retval The new state of EXTI_Line (SET or RESET).
+  */
+ITStatus EXTI_GetITStatus(uint32_t EXTI_Line)
+{
+  FlagStatus bitstatus = RESET;
+  /* Check the parameters */
+  assert_param(IS_GET_EXTI_LINE(EXTI_Line));
+  
+  if ((EXTI->PR & EXTI_Line) != (uint32_t)RESET)
+  {
+    bitstatus = SET;
+  }
+  else
+  {
+    bitstatus = RESET;
+  }
+  return bitstatus;
+}
+
+/**
+  * @brief  Clears the EXTI's line pending bits.
+  * @param  EXTI_Line: specifies the EXTI lines to clear.
+  *   This parameter can be any combination of EXTI_Linex where x can be (0..23).
+  * @retval None
+  */
+void EXTI_ClearITPendingBit(uint32_t EXTI_Line)
+{
+  /* Check the parameters */
+  assert_param(IS_EXTI_LINE(EXTI_Line));
+  
+  EXTI->PR = EXTI_Line;
+}
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/