Subversion Repositories openrisc_2011-10-31

/**
  ******************************************************************************
  * @file  misc.c
  * @author  MCD Application Team
  * @version  V3.0.0
  * @date  04/06/2009
  * @brief  This file provides all the miscellaneous firmware functions.
  ******************************************************************************
  * @copy
  *
  * 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 2009 STMicroelectronics</center></h2>
  */ 
 
/* Includes ------------------------------------------------------------------*/
#include "misc.h"
 
/** @addtogroup 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 0x100.
  * @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 2009 STMicroelectronics *****END OF FILE****/