Demo/ARM7_STR75x_IAR/STLibrary/src/75x_extit.c

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+/******************** (C) COPYRIGHT 2006 STMicroelectronics ********************
+* File Name          : 75x_extit.c
+* Author             : MCD Application Team
+* Date First Issued  : 03/10/2006
+* Description        : This file provides all the EXTIT software functions.
+********************************************************************************
+* History:
+* 07/17/2006 : V1.0
+* 03/10/2006 : V0.1
+********************************************************************************
+* THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
+* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
+* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
+* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
+* CONTENT OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
+* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
+*******************************************************************************/
+
+/* Includes ------------------------------------------------------------------*/
+#include "75x_extit.h"
+#include "75x_mrcc.h"
+
+/* Private typedef -----------------------------------------------------------*/
+/* Private define ------------------------------------------------------------*/
+/* Private macro -------------------------------------------------------------*/
+/* Private variables ---------------------------------------------------------*/
+/* Private function prototypes -----------------------------------------------*/
+/* Private functions ---------------------------------------------------------*/
+
+/*******************************************************************************
+* Function Name  : EXTIT_DeInit
+* Description    : Deinitializes the EXTIT peripheral registers to their default
+*                  reset values.
+* Input          : None
+* Output         : None
+* Return         : None
+*******************************************************************************/
+void EXTIT_DeInit(void)
+{
+  MRCC_PeripheralSWResetConfig(MRCC_Peripheral_EXTIT,ENABLE);
+  MRCC_PeripheralSWResetConfig(MRCC_Peripheral_EXTIT,DISABLE);
+}
+
+/*******************************************************************************
+* Function Name  : EXTIT_Init
+* Description    : Initializes the EXTIT peripheral according to the specified
+*                  parameters in the EXTIT_InitStruct .
+* Input          : - EXTIT_InitStruct: pointer to a EXTIT_InitTypeDef structure
+*                    that contains the configuration information for the EXTIT
+*                    peripheral.
+* Output         : None
+* Return         : None
+*******************************************************************************/
+void EXTIT_Init(EXTIT_InitTypeDef* EXTIT_InitStruct)
+{
+  if(EXTIT_InitStruct->EXTIT_ITLineCmd == ENABLE)
+  {
+    /* Enable the selected external interrupts */
+    EXTIT->MR |= EXTIT_InitStruct->EXTIT_ITLine;
+    
+    /* Select the trigger for the selected external interrupts */
+    if(EXTIT_InitStruct->EXTIT_ITTrigger == EXTIT_ITTrigger_Falling)
+    {
+      /* Falling edge */
+      EXTIT->TSR &= ~EXTIT_InitStruct->EXTIT_ITLine;
+    }
+    else if (EXTIT_InitStruct->EXTIT_ITTrigger == EXTIT_ITTrigger_Rising)
+    {
+      /* Rising edge */
+      EXTIT->TSR |= EXTIT_InitStruct->EXTIT_ITLine;
+    }
+  }
+  else if(EXTIT_InitStruct->EXTIT_ITLineCmd == DISABLE)
+  {
+    /* Disable the selected external interrupts */
+    EXTIT->MR &= ~EXTIT_InitStruct->EXTIT_ITLine;
+  }
+}
+
+/*******************************************************************************
+* Function Name  : EXTIT_StructInit
+* Description    : Fills each EXTIT_InitStruct member with its reset value.
+* Input          : - EXTIT_InitStruct: pointer to a EXTIT_InitTypeDef structure
+*                    which will be initialized.
+* Output         : None
+* Return         : None
+*******************************************************************************/
+void EXTIT_StructInit(EXTIT_InitTypeDef* EXTIT_InitStruct)
+{
+  EXTIT_InitStruct->EXTIT_ITLine = EXTIT_ITLineNone;
+  EXTIT_InitStruct->EXTIT_ITTrigger = EXTIT_ITTrigger_Falling;
+  EXTIT_InitStruct->EXTIT_ITLineCmd = DISABLE;
+}
+
+/*******************************************************************************
+* Function Name  : EXTIT_GenerateSWInterrupt
+* Description    : Generates a Software interrupt.
+* Input          : - EXTIT_ITLine: specifies the EXTIT lines to be enabled or
+*                    disabled. This parameter can be:
+*                     - EXTIT_ITLinex: External interrupt line x where x(0..15)
+* Output         : None
+* Return         : None
+*******************************************************************************/
+void EXTIT_GenerateSWInterrupt(u16 EXTIT_ITLine)
+{
+  EXTIT->SWIR |= EXTIT_ITLine;
+}
+
+/*******************************************************************************
+* Function Name  : EXTIT_GetFlagStatus
+* Description    : Checks whether the specified EXTIT line flag is set or not.
+* Input          : - EXTIT_ITLine: specifies the EXTIT lines flag to check.  
+*                    This parameter can be:
+*                     - EXTIT_ITLinex: External interrupt line x where x(0..15)
+* Output         : None
+* Return         : The new state of EXTIT_ITLine (SET or RESET).
+*******************************************************************************/
+FlagStatus EXTIT_GetFlagStatus(u16 EXTIT_ITLine)
+{
+  if((EXTIT->PR & EXTIT_ITLine) != RESET)
+  {
+    return SET;
+  }
+  else
+  {
+    return RESET;
+  }
+}
+
+/*******************************************************************************
+* Function Name  : EXTIT_ClearFlag
+* Description    : Clears the EXTIT’s line pending flags.
+* Input          : - EXTIT_ITLine: specifies the EXTIT lines flags to clear. 
+*                    This parameter can be:
+*                     - EXTIT_ITLinex: External interrupt line x where x(0..15)
+* Output         : None
+* Return         : None
+*******************************************************************************/
+void EXTIT_ClearFlag(u16 EXTIT_ITLine)
+{
+  EXTIT->PR = EXTIT_ITLine;
+}
+
+/*******************************************************************************
+* Function Name  : EXTIT_GetITStatus
+* Description    : Checks whether the specified EXTIT line is asserted or not.
+* Input          : - EXTIT_ITLine: specifies the EXTIT lines to check. 
+*                    This parameter can be:
+*                     - EXTIT_ITLinex: External interrupt line x where x(0..15)
+* Output         : None
+* Return         : The new state of EXTIT_ITLine (SET or RESET).
+*******************************************************************************/
+ITStatus EXTIT_GetITStatus(u16 EXTIT_ITLine)
+{
+  if(((EXTIT->PR & EXTIT_ITLine) != RESET)&& ((EXTIT->MR & EXTIT_ITLine) != RESET))
+  {
+    return SET;
+  }
+  else
+  {
+    return RESET;
+  }
+}
+
+/*******************************************************************************
+* Function Name  : EXTIT_ClearITPendingBit
+* Description    : Clears the EXTIT’s line pending bits.
+* Input          : - EXTIT_ITLine: specifies the EXTIT lines to clear. 
+*                    This parameter can be:
+*                     - EXTIT_ITLinex: External interrupt line x where x(0..15)
+* Output         : None
+* Return         : None
+*******************************************************************************/
+void EXTIT_ClearITPendingBit(u16 EXTIT_ITLine)
+{
+  EXTIT->PR = EXTIT_ITLine;
+}
+
+/******************* (C) COPYRIGHT 2006 STMicroelectronics *****END OF FILE****/