text: /**
    ******************************************************************************
    * @file    misc.c
    * @author  MCD Application Team
    * @version V3.6.1
    * @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 STM32F10x_StdPeriph_Driver
    * @{
    */
  
  /** @defgroup MISC
    * @brief MISC driver modules
    * @{
    */
  
  /** @defgroup MISC_Private_TypesDefinitions
    * @{
    */
  
  /**
    * @}
    */
  
  /** @defgroup MISC_Private_Defines
    * @{
    */
  
  #define AIRCR_VECTKEY_MASK    ((uint32_t)0x05FA0000)
  /**
    * @}
    */
  
  /** @defgroup MISC_Private_Macros
    * @{
    */
  
  /**
    * @}
    */
  
  /** @defgroup MISC_Private_Variables
    * @{
    */
  
  /**
    * @}
    */
  
  /** @defgroup MISC_Private_FunctionPrototypes
    * @{
    */
  
  /**
    * @}
    */
  
  /** @defgroup MISC_Private_Functions
    * @{
    */
  
  /**
    * @brief  Configures the priority grouping: pre-emption 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 pre-emption priority
    *                                4 bits for subpriority
    *     @arg NVIC_PriorityGroup_1: 1 bits for pre-emption priority
    *                                3 bits for subpriority
    *     @arg NVIC_PriorityGroup_2: 2 bits for pre-emption priority
    *                                2 bits for subpriority
    *     @arg NVIC_PriorityGroup_3: 3 bits for pre-emption priority
    *                                1 bits for subpriority
    *     @arg NVIC_PriorityGroup_4: 4 bits for pre-emption 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.
    * @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)
  {
    uint32_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 |=  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
    *     @arg NVIC_VectTab_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
    *     @arg NVIC_LP_SLEEPDEEP
    *     @arg NVIC_LP_SLEEPONEXIT
    * @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****/
  