/**
  ******************************************************************************
  * @file    stm32l1xx_syscfg.c
  * @author  MCD Application Team
  * @version V1.0.0
  * @date    31-December-2010
  * @brief   This file provides firmware functions to manage the following 
  *          functionalities of the SYSCFG and RI peripherals:           
  *           - SYSCFG Initialization and Configuration
  *           - RI Initialization and Configuration
  *
  *  @verbatim
  *  
  *          ===================================================================
  *                                 How to use this driver
  *          ===================================================================
  *                  
  *          This driver provides functions for:
  *          
  *          1. Remapping the memory accessible in the code area using
  *             SYSCFG_MemoryRemapConfig()  
  *          2. Manage the EXTI lines connection to the GPIOs using
  *             SYSCFG_EXTILineConfig().
  *          3. Routing of I/Os toward the input captures of timers (TIM2, TIM3 and TIM4).
  *          4. Input routing of COMP1 and COMP2
  *          5. Routing of internal reference voltage VREFINT to PB0 and PB1.
  *
  *          6. The RI registers can be accessed only when the comparator 
  *             APB interface clock is enabled.
  *             To enable comparator clock use:
  *             RCC_APB1PeriphClockCmd(RCC_APB1Periph_COMP, ENABLE);
  *
  *             Following functions uses RI registers:
  *                   - SYSCFG_RIDeInit()
  *                   - SYSCFG_RITIMSelect()
  *                   - SYSCFG_RITIMInputCaptureConfig()
  *                   - SYSCFG_RIResistorConfig()
  *                   - SYSCFG_RIIOSwitchConfig()
  *                   - SYSCFG_RISwitchControlModeCmd()
  *                   - SYSCFG_RIHysteresisConfig()
  *
  *          7- The SYSCFG registers can be accessed only when the SYSCFG 
  *             interface APB clock is enabled.
  *             To enable SYSCFG APB clock use:
  *             RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
  *
  *             Following functions uses SYSCFG registers:
  *                   - SYSCFG_MemoryRemapConfig()
  *                   - SYSCFG_USBPuCmd()
  *                   - SYSCFG_EXTILineConfig()
  *                 
  *  @endverbatim
  *      
  ******************************************************************************
  * @attention
  *
  * THE PRESENT FIRMWARE 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 FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
  * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
  *
  * <h2><center>&copy; COPYRIGHT 2010 STMicroelectronics</center></h2>
  ******************************************************************************  
  */ 

/* Includes ------------------------------------------------------------------*/
#include "stm32l1xx_syscfg.h"
#include "stm32l1xx_rcc.h"

/** @addtogroup STM32L1xx_StdPeriph_Driver
  * @{
  */

/** @defgroup SYSCFG 
  * @brief SYSCFG driver modules
  * @{
  */ 

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define TIM_SELECT_MASK             ((uint32_t)0xFFFCFFFF) /*!< TIM select mask */
#define IC_ROUTING_MASK             ((uint32_t)0x0000000F) /*!< Input Capture routing mask */

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

/** @defgroup SYSCFG_Private_Functions
  * @{
  */ 

/** @defgroup SYSCFG_Group1 SYSCFG Initialization and Configuration functions
 *  @brief   SYSCFG Initialization and Configuration functions 
 *
@verbatim   
 ===============================================================================
             SYSCFG Initialization and Configuration functions
 ===============================================================================  

@endverbatim
  * @{
  */

/**
  * @brief  Deinitializes the SYSCFG registers to their default reset values.
  * @param  None
  * @retval None
  * @ Note: MEMRMP bits are not reset by APB2 reset.
  */
void SYSCFG_DeInit(void)
{
   RCC_APB2PeriphResetCmd(RCC_APB2Periph_SYSCFG, ENABLE);
   RCC_APB2PeriphResetCmd(RCC_APB2Periph_SYSCFG, DISABLE);
}

/**
  * @brief Deinitializes the RI registers to their default reset values.
  * @param  None
  * @retval None
  */
void SYSCFG_RIDeInit(void)
{
  RI->ICR     = ((uint32_t)0x00000000);    /*!< Set RI->ICR to reset value */
  RI->ASCR1   = ((uint32_t)0x00000000);    /*!< Set RI->ASCR1 to reset value */  
  RI->ASCR2   = ((uint32_t)0x00000000);    /*!< Set RI->ASCR2 to reset value */  
  RI->HYSCR1  = ((uint32_t)0x00000000);    /*!< Set RI->HYSCR1 to reset value */
  RI->HYSCR2  = ((uint32_t)0x00000000);    /*!< Set RI->HYSCR2 to reset value */
  RI->HYSCR3  = ((uint32_t)0x00000000);    /*!< Set RI->HYSCR3 to reset value */
}

/**
  * @brief  Changes the mapping of the specified memory.
  * @param  SYSCFG_Memory: selects the memory remapping.
  *   This parameter can be one of the following values:
  *     @arg SYSCFG_MemoryRemap_Flash:       Main Flash memory mapped at 0x00000000  
  *     @arg SYSCFG_MemoryRemap_SystemFlash: System Flash memory mapped at 0x00000000
  *     @arg SYSCFG_MemoryRemap_SRAM:        Embedded SRAM mapped at 0x00000000     
  * @retval None
  */
void SYSCFG_MemoryRemapConfig(uint8_t SYSCFG_MemoryRemap)
{
  /* Check the parameters */
  assert_param(IS_SYSCFG_MEMORY_REMAP_CONFING(SYSCFG_MemoryRemap));
  SYSCFG->MEMRMP = SYSCFG_MemoryRemap;
}

/**
  * @brief  Control the internal pull-up on USB DP line.
  * @param  NewState: New state of the internal pull-up on USB DP line. 
  *   This parameter can be ENABLE: Connect internal pull-up on USB DP line.
  *                      or DISABLE: Disconnect internal pull-up on USB DP line.
  * @retval None
  */
void SYSCFG_USBPuCmd(FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NewState));

  if (NewState != DISABLE)
  { 
    /* Connect internal pull-up on USB DP line */
    SYSCFG->PMC |= (uint32_t) SYSCFG_PMC_USB_PU;
  }
  else
  {
    /* Disconnect internal pull-up on USB DP line */
    SYSCFG->PMC &= (uint32_t)(~SYSCFG_PMC_USB_PU);
  }
}

/**
  * @brief  Selects the GPIO pin used as EXTI Line.
  * @param  EXTI_PortSourceGPIOx : selects the GPIO port to be used as source 
  *                                for EXTI lines where x can be (A, B, C, D, E or H).
  * @param  EXTI_PinSourcex: specifies the EXTI line to be configured.
  *         This parameter can be EXTI_PinSourcex where x can be (0..15)
  * @retval None
  */
void SYSCFG_EXTILineConfig(uint8_t EXTI_PortSourceGPIOx, uint8_t EXTI_PinSourcex)
{
  uint32_t tmp = 0x00;

  /* Check the parameters */
  assert_param(IS_EXTI_PORT_SOURCE(EXTI_PortSourceGPIOx));
  assert_param(IS_EXTI_PIN_SOURCE(EXTI_PinSourcex));
  
  tmp = ((uint32_t)0x0F) << (0x04 * (EXTI_PinSourcex & (uint8_t)0x03));
  SYSCFG->EXTICR[EXTI_PinSourcex >> 0x02] &= ~tmp;
  SYSCFG->EXTICR[EXTI_PinSourcex >> 0x02] |= (((uint32_t)EXTI_PortSourceGPIOx) << (0x04 * (EXTI_PinSourcex & (uint8_t)0x03)));
}

/**
  * @}
  */

/** @defgroup SYSCFG_Group2 RI Initialization and Configuration functions
 *  @brief   RI Initialization and Configuration functions
 *
@verbatim   
 ===============================================================================
               RI Initialization and Configuration functions
 ===============================================================================  

@endverbatim
  * @{
  */

/**
  * @brief  Configures the routing interface to select which Timer to be routed.
  * @note   Routing capability can be applied only on one of the three timers
  *         (TIM2, TIM3 or TIM4) at a time.
  * @param  TIM_Select: Timer select.
  *   This parameter can be one of the following values:
  *     @arg TIM_Select_None: No timer selected and default Timer mapping is enabled.
  *     @arg TIM_Select_TIM2: Timer 2 Input Captures to be routed.
  *     @arg TIM_Select_TIM3: Timer 3 Input Captures to be routed.
  *     @arg TIM_Select_TIM4: Timer 4 Input Captures to be routed.
  * @retval None.
  */
void SYSCFG_RITIMSelect(uint32_t TIM_Select)
{
  uint32_t tmpreg = 0;

  /* Check the parameters */
  assert_param(IS_RI_TIM(TIM_Select));

  /* Get the old register value */
  tmpreg = RI->ICR;

  /* Clear the TIMx select bits */
  tmpreg &= TIM_SELECT_MASK;

  /* Select the Timer */
  tmpreg |= (TIM_Select);

  /* Write to RI->ICR register */
  RI->ICR = tmpreg;
}

/**
  * @brief  Configures the routing interface to map Input Capture 1, 2, 3 or 4
  *         to a selected I/O pin.
  * @param  RI_InputCapture selects which input capture to be routed.
  *   This parameter can be one (or combination) of the following parameters:
  *     @arg  RI_InputCapture_IC1: Input capture 1 is selected.
  *     @arg  RI_InputCapture_IC2: Input capture 2 is selected.
  *     @arg  RI_InputCapture_IC3: Input capture 3 is selected.
  *     @arg  RI_InputCapture_IC4: Input capture 4 is selected.
  * @param  RI_InputCaptureRouting: selects which pin to be routed to Input Capture.
  *   This parameter can be one of the following values:
  *     @arg  RI_InputCaptureRouting_0 to RI_InputCaptureRouting_15
  *     e.g.
  *       SYSCFG_RITIMSelect(TIM_Select_TIM2)
  *       SYSCFG_RITIMInputCaptureConfig(RI_InputCapture_IC1, RI_InputCaptureRouting_1)
  *       allows routing of Input capture IC1 of TIM2 to PA4.
  *       For details about correspondence between RI_InputCaptureRouting_x 
  *       and I/O pins refer to the parameters' description in the header file
  *       or refer to the product reference manual.
  * @note Input capture selection bits are not reset by this function.
  *       To reset input capture selection bits, use SYSCFG_RIDeInit() function.
  * @note The I/O should be configured in alternate function mode (AF14) using
  *       GPIO_PinAFConfig() function.
  * @retval None.
  */
void SYSCFG_RITIMInputCaptureConfig(uint32_t RI_InputCapture, uint32_t RI_InputCaptureRouting)
{
  uint32_t tmpreg = 0;

  /* Check the parameters */
  assert_param(IS_RI_INPUTCAPTURE(RI_InputCapture));
  assert_param(IS_RI_INPUTCAPTURE_ROUTING(RI_InputCaptureRouting));

  /* Get the old register value */
  tmpreg = RI->ICR;

  /* Select input captures to be routed */
  tmpreg |= (RI_InputCapture);