/**
  ******************************************************************************
  * @file    misc.c
  * @author  MCD Application Team
  * @version V1.1.1
  * @date    05-March-2012
  * @brief   This file provides all the miscellaneous firmware functions (add-on
  *          to CMSIS functions).
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; COPYRIGHT 2012 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 "misc.h"

/** @addtogroup STM32L1xx_StdPeriph_Driver
  * @{
  */

/** @defgroup MISC 
  * @brief MISC driver modules
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define AIRCR_VECTKEY_MASK    ((uint32_t)0x05FA0000)

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/

/** @defgroup MISC_Private_Functions
  * @{
  */
/**
  *
@verbatim
 *******************************************************************************
                   ##### Interrupts configuration functions #####
 *******************************************************************************
    [..] This section provide functions allowing to configure the NVIC interrupts 
         (IRQ).The Cortex-M3 exceptions are managed by CMSIS functions.
         (#) Configure the NVIC Priority Grouping using NVIC_PriorityGroupConfig() 
             function according to the following table.
             The table below gives the allowed values of the preemption priority 
             and subpriority according to the Priority Grouping configuration 
             performed by NVIC_PriorityGroupConfig function.
  ============================================================================================================================
    NVIC_PriorityGroup   | NVIC_IRQChannelPreemptionPriority | NVIC_IRQChannelSubPriority  | Description
  ============================================================================================================================
   NVIC_PriorityGroup_0  |                0                  |            0-15             |   0 bits for preemption priority
                         |                                   |                             |   4 bits for subpriority
  ----------------------------------------------------------------------------------------------------------------------------
   NVIC_PriorityGroup_1  |                0-1                |            0-7              |   1 bits for preemption priority
                         |                                   |                             |   3 bits for subpriority
  ----------------------------------------------------------------------------------------------------------------------------
   NVIC_PriorityGroup_2  |                0-3                |            0-3              |   2 bits for preemption priority
                         |                                   |                             |   2 bits for subpriority
  ----------------------------------------------------------------------------------------------------------------------------
   NVIC_PriorityGroup_3  |                0-7                |            0-1              |   3 bits for preemption priority
                         |                                   |                             |   1 bits for subpriority
  ----------------------------------------------------------------------------------------------------------------------------
   NVIC_PriorityGroup_4  |                0-15               |            0                |   4 bits for preemption priority
                         |                                   |                             |   0 bits for subpriority
  ============================================================================================================================


         (#) Enable and Configure the priority of the selected IRQ Channels.  

        -@- When the NVIC_PriorityGroup_0 is selected, it will no any nested interrupt,
            the IRQ priority will be managed only by subpriority.
            The sub-priority is only used to sort pending exception priorities, 
            and does not affect active exceptions.
        -@- Lower priority values gives higher priority.
        -@- Priority Order:
            (#@) Lowest Preemption priority.
            (#@) Lowest Subpriority.
            (#@) Lowest hardware priority (IRQn position).
  
@endverbatim
*/

/**
  * @brief  Configures the priority grouping: preemption priority and subpriority.
  * @param  NVIC_PriorityGroup: specifies the priority grouping bits length. 
  *   This parameter can be one of the following values:
  *     @arg NVIC_PriorityGroup_0: 0 bits for preemption priority
  *                                4 bits for subpriority.
  *     @note When NVIC_PriorityGroup_0 is selected, it will no be any nested 
  *           interrupt. This interrupts priority is managed only with subpriority.  
  *     @arg NVIC_PriorityGroup_1: 1 bits for preemption priority.
  *                                3 bits for subpriority.
  *     @arg NVIC_PriorityGroup_2: 2 bits for preemption priority.
  *                                2 bits for subpriority.
  *     @arg NVIC_PriorityGroup_3: 3 bits for preemption priority.
  *                                1 bits for subpriority.
  *     @arg NVIC_PriorityGroup_4: 4 bits for preemption priority.
  *                                0 bits for subpriority.
  * @retval None
  */
void NVIC_PriorityGroupConfig(uint32_t NVIC_PriorityGroup)
{
  /* Check the parameters */
  assert_param(IS_NVIC_PRIORITY_GROUP(NVIC_PriorityGroup));
  
  /* Set the PRIGROUP[10:8] bits according to NVIC_PriorityGroup value */
  SCB->AIRCR = AIRCR_VECTKEY_MASK | NVIC_PriorityGroup;
}

/**
  * @brief  Initializes the NVIC peripheral according to the specified
  *         parameters in the NVIC_InitStruct.
  * @note   To configure interrupts priority correctly, the NVIC_PriorityGroupConfig()
  *         function should be called before.
  * @param  NVIC_InitStruct: pointer to a NVIC_InitTypeDef structure that contains
  *         the configuration information for the specified NVIC peripheral.
  * @retval None
  */
void NVIC_Init(NVIC_InitTypeDef* NVIC_InitStruct)
{
  uint8_t tmppriority = 0x00, tmppre = 0x00, tmpsub = 0x0F;
  
  /* Check the parameters */
  assert_param(IS_FUNCTIONAL_STATE(NVIC_InitStruct->NVIC_IRQChannelCmd));
  assert_param(IS_NVIC_PREEMPTION_PRIORITY(NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority));  
  assert_param(IS_NVIC_SUB_PRIORITY(NVIC_InitStruct->NVIC_IRQChannelSubPriority));
    
  if (NVIC_InitStruct->NVIC_IRQChannelCmd != DISABLE)
  {
    /* Compute the Corresponding IRQ Priority --------------------------------*/    
    tmppriority = (0x700 - ((SCB->AIRCR) & (uint32_t)0x700))>> 0x08;
    tmppre = (0x4 - tmppriority);
    tmpsub = tmpsub >> tmppriority;

    tmppriority = (uint32_t)NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority << tmppre;
    tmppriority |=  (uint8_t)(NVIC_InitStruct->NVIC_IRQChannelSubPriority & tmpsub);
    tmppriority = tmppriority << 0x04;
        
    NVIC->IP[NVIC_InitStruct->NVIC_IRQChannel] = tmppriority;
    
    /* Enable the Selected IRQ Channels --------------------------------------*/
    NVIC->ISER[NVIC_InitStruct->NVIC_IRQChannel >> 0x05] =
      (uint32_t)0x01 << (NVIC_InitStruct->NVIC_IRQChannel & (uint8_t)0x1F);
  }
  else
  {
    /* Disable the Selected IRQ Channels -------------------------------------*/
    NVIC->ICER[NVIC_InitStruct->NVIC_IRQChannel >> 0x05] =
      (uint32_t)0x01 << (NVIC_InitStruct->NVIC_IRQChannel & (uint8_t)0x1F);
  }
}

/**
  * @brief  Sets the vector table location and Offset.
  * @param  NVIC_VectTab: specifies if the vector table is in RAM or FLASH memory.
  *   This parameter can be one of the following values:
  *     @arg NVIC_VectTab_RAM: Vector Table in internal SRAM.
  *     @arg NVIC_VectTab_FLASH: Vector Table in internal FLASH.
  * @param  Offset: Vector Table base offset field. This value must be a multiple of 0x200.
  * @retval None
  */
void NVIC_SetVectorTable(uint32_t NVIC_VectTab, uint32_t Offset)
{ 
  /* Check the parameters */
  assert_param(IS_NVIC_VECTTAB(NVIC_VectTab));
  assert_param(IS_NVIC_OFFSET(Offset));  
   
  SCB->VTOR = NVIC_VectTab | (Offset & (uint32_t)0x1FFFFF80);
}

/**
  * @brief  Selects the condition for the system to enter low power mode.
  * @param  LowPowerMode: Specifies the new mode for the system to enter low power mode.
  *   This parameter can be one of the following values:
  *     @arg NVIC_LP_SEVONPEND: Low Power SEV on Pend.
  *     @arg NVIC_LP_SLEEPDEEP: Low Power DEEPSLEEP request.
  *     @arg NVIC_LP_SLEEPONEXIT: Low Power Sleep on Exit.
  * @param  NewState: new state of LP condition. 
  *         This parameter can be: ENABLE or DISABLE.
  * @retval None
  */
void NVIC_SystemLPConfig(uint8_t LowPowerMode, FunctionalState NewState)
{
  /* Check the parameters */
  assert_param(IS_NVIC_LP(LowPowerMode));
  assert_param(IS_FUNCTIONAL_STATE(NewState));  
  
  if (NewState != DISABLE)
  {
    SCB->SCR |= LowPowerMode;
  }
  else
  {
    SCB->SCR &= (uint32_t)(~(uint32_t)LowPowerMode);
  }
}

/**
  * @brief  Configures the SysTick clock source.
  * @param  SysTick_CLKSource: specifies the SysTick clock source.
  *   This parameter can be one of the following values:
  *     @arg SysTick_CLKSource_HCLK_Div8: AHB clock divided by 8 selected as SysTick clock source.
  *     @arg SysTick_CLKSource_HCLK: AHB clock selected as SysTick clock source.
  * @retval None
  */
void SysTick_CLKSourceConfig(uint32_t SysTick_CLKSource)
{
  /* Check the parameters */
  assert_param(IS_SYSTICK_CLK_SOURCE(SysTick_CLKSource));
  
  if (SysTick_CLKSource == SysTick_CLKSource_HCLK)
  {
    SysTick->CTRL |= SysTick_CLKSource_HCLK;
  }
  else
  {
    SysTick->CTRL &= SysTick_CLKSource_HCLK_Div8;
  }
}

/**
  * @}
  */

/**
  * @}
  */

/**
  * @}
  */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/