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misc.c中断优先级的设置

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ID:72519 发表于 2015-1-23 03:45 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
  1. /**
  2.   ******************************************************************************
  3.   * @file    misc.c
  4.   * @author  MCD Application Team
  5.   * @version V3.5.0
  6.   * @date    11-March-2011
  7.   * @brief   This file provides all the miscellaneous firmware functions (add-on
  8.   *          to CMSIS functions).
  9. 1.优先级分组设置。
  10. 2.中断号大于0的中断的优先级的设置。
  11. 3.中断向量表的地址的偏移的设置。
  12. 4.低功耗模式的设置。
  13. 5.SysTick的时钟源配置。
  14. ******************************************************************************
  15.   * @attention
  16.   *
  17.   * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
  18.   * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
  19.   * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
  20.   * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
  21.   * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
  22.   * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
  23.   *
  24.   * <h2><center>© COPYRIGHT 2011 STMicroelectronics</center></h2>
  25.   ******************************************************************************
  26.   */
  27. /* Includes ------------------------------------------------------------------*/
  28. #include "misc.h"
  29. /** @addtogroup STM32F10x_StdPeriph_Driver
  30.   * @{
  31.   */
  32. /** @defgroup MISC
  33.   * @brief MISC driver modules
  34.   * @{
  35.   */
  36. /** @defgroup MISC_Private_TypesDefinitions
  37.   * @{
  38.   */
  39. /**
  40.   * @}
  41.   */
  42. /** @defgroup MISC_Private_Defines
  43.   * @{
  44.   */
  45. #define AIRCR_VECTKEY_MASK    ((uint32_t)0x05FA0000)
  46. /**
  47.   * @}
  48.   */
  49. /** @defgroup MISC_Private_Macros
  50.   * @{
  51.   */
  52. /**
  53.   * @}
  54.   */
  55. /** @defgroup MISC_Private_Variables
  56.   * @{
  57.   */
  58. /**
  59.   * @}
  60.   */
  61. /** @defgroup MISC_Private_FunctionPrototypes
  62.   * @{
  63.   */
  64. /**
  65.   * @}
  66.   */
  67. /** @defgroup MISC_Private_Functions
  68.   * @{
  69.   */
  70. /**
  71.   * @brief  Configures the priority grouping: pre-emption priority and subpriority.
  72.   * @param  NVIC_PriorityGroup: specifies the priority grouping bits length.
  73.   *   This parameter can be one of the following values:
  74.   *     @arg NVIC_PriorityGroup_0: 0 bits for pre-emption priority
  75.   *                                4 bits for subpriority
  76.   *     @arg NVIC_PriorityGroup_1: 1 bits for pre-emption priority
  77.   *                                3 bits for subpriority
  78.   *     @arg NVIC_PriorityGroup_2: 2 bits for pre-emption priority
  79.   *                                2 bits for subpriority
  80.   *     @arg NVIC_PriorityGroup_3: 3 bits for pre-emption priority
  81.   *                                1 bits for subpriority
  82.   *     @arg NVIC_PriorityGroup_4: 4 bits for pre-emption priority
  83.   *                                0 bits for subpriority
  84.   * @retval None
  85.   */
  86. void NVIC_PriorityGroupConfig(uint32_t NVIC_PriorityGroup)//优先级组配置，抢占式优先级和响应优先级所占位的个数的配置
  87. {
  88.   /* Check the parameters */
  89.   assert_param(IS_NVIC_PRIORITY_GROUP(NVIC_PriorityGroup));

  91.   /* Set the PRIGROUP[10:8] bits according to NVIC_PriorityGroup value */
  92.   SCB->AIRCR = AIRCR_VECTKEY_MASK | NVIC_PriorityGroup;
  93. }
  94. /**
  95.   * @brief  Initializes the NVIC peripheral according to the specified
  96.   *         parameters in the NVIC_InitStruct.
  97.   * @param  NVIC_InitStruct: pointer to a NVIC_InitTypeDef structure that contains
  98.   *         the configuration information for the specified NVIC peripheral.
  99.   * @retval None
  100.   */
  101. void NVIC_Init(NVIC_InitTypeDef* NVIC_InitStruct)//根据结构体的指定参数初始化NVIC,但是只能设置中断号大于0的中断向量
  102. {
  103.   uint32_t tmppriority = 0x00, tmppre = 0x00, tmpsub = 0x0F;

  105.   /* Check the parameters */
  106.   assert_param(IS_FUNCTIONAL_STATE(NVIC_InitStruct->NVIC_IRQChannelCmd));
  107.   assert_param(IS_NVIC_PREEMPTION_PRIORITY(NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority));
  108.   assert_param(IS_NVIC_SUB_PRIORITY(NVIC_InitStruct->NVIC_IRQChannelSubPriority));
  109.    
  110.   if (NVIC_InitStruct->NVIC_IRQChannelCmd != DISABLE)
  111.   {
  112.     /* Compute the Corresponding IRQ Priority --------------------------------*/   
  113.     tmppriority = (0x700 - ((SCB->AIRCR) & (uint32_t)0x700))>> 0x08;
  114.     tmppre = (0x4 - tmppriority);
  115.     tmpsub = tmpsub >> tmppriority;
  116.     tmppriority = (uint32_t)NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority << tmppre;
  117.     tmppriority |=  NVIC_InitStruct->NVIC_IRQChannelSubPriority & tmpsub;
  118.     tmppriority = tmppriority << 0x04;
  119.       
  120.     NVIC->IP[NVIC_InitStruct->NVIC_IRQChannel] = tmppriority;
  121.    
  122.     /* Enable the Selected IRQ Channels --------------------------------------*/
  123.     NVIC->ISER[NVIC_InitStruct->NVIC_IRQChannel >> 0x05] =
  124.       (uint32_t)0x01 << (NVIC_InitStruct->NVIC_IRQChannel & (uint8_t)0x1F);
  125.   }
  126.   else
  127.   {
  128.     /* Disable the Selected IRQ Channels -------------------------------------*/
  129.     NVIC->ICER[NVIC_InitStruct->NVIC_IRQChannel >> 0x05] =
  130.       (uint32_t)0x01 << (NVIC_InitStruct->NVIC_IRQChannel & (uint8_t)0x1F);
  131.   }
  132. }
  133. /**
  134.   * @brief  Sets the vector table location and Offset.
  135.   * @param  NVIC_VectTab: specifies if the vector table is in RAM or FLASH memory.
  136.   *   This parameter can be one of the following values:
  137.   *     @arg NVIC_VectTab_RAM
  138.   *     @arg NVIC_VectTab_FLASH
  139.   * @param  Offset: Vector Table base offset field. This value must be a multiple
  140.   *         of 0x200.
  141.   * @retval None
  142.   */
  143. void NVIC_SetVectorTable(uint32_t NVIC_VectTab, uint32_t Offset)//设置向量表的位置（RAM或FLASH中）和偏移
  144. {
  145.   /* Check the parameters */
  146.   assert_param(IS_NVIC_VECTTAB(NVIC_VectTab));
  147.   assert_param(IS_NVIC_OFFSET(Offset));
  148.   
  149.   SCB->VTOR = NVIC_VectTab | (Offset & (uint32_t)0x1FFFFF80);
  150. }
  151. /**
  152.   * @brief  Selects the condition for the system to enter low power mode.
  153.   * @param  LowPowerMode: Specifies the new mode for the system to enter low power mode.
  154.   *   This parameter can be one of the following values:
  155.   *     @arg NVIC_LP_SEVONPEND
  156.   *     @arg NVIC_LP_SLEEPDEEP
  157.   *     @arg NVIC_LP_SLEEPONEXIT
  158.   * @param  NewState: new state of LP condition. This parameter can be: ENABLE or DISABLE.
  159.   * @retval None
  160.   */
  161. void NVIC_SystemLPConfig(uint8_t LowPowerMode, FunctionalState NewState)//系统低功耗模式配置
  162. {
  163.   /* Check the parameters */
  164.   assert_param(IS_NVIC_LP(LowPowerMode));
  165.   assert_param(IS_FUNCTIONAL_STATE(NewState));

  167.   if (NewState != DISABLE)
  168.   {
  169.     SCB->SCR |= LowPowerMode;
  170.   }
  171.   else
  172.   {
  173.     SCB->SCR &= (uint32_t)(~(uint32_t)LowPowerMode);
  174.   }
  175. }
  176. /**
  177.   * @brief  Configures the SysTick clock source.
  178.   * @param  SysTick_CLKSource: specifies the SysTick clock source.
  179.   *   This parameter can be one of the following values:
  180.   *     @arg SysTick_CLKSource_HCLK_Div8: AHB clock divided by 8 selected as SysTick clock source.
  181.   *     @arg SysTick_CLKSource_HCLK: AHB clock selected as SysTick clock source.
  182.   * @retval None
  183.   */
  184. void SysTick_CLKSourceConfig(uint32_t SysTick_CLKSource)//SysTick的时钟源配置
  185. {
  186.   /* Check the parameters */
  187.   assert_param(IS_SYSTICK_CLK_SOURCE(SysTick_CLKSource));
  188.   if (SysTick_CLKSource == SysTick_CLKSource_HCLK)
  189.   {
  190.     SysTick->CTRL |= SysTick_CLKSource_HCLK;
  191.   }
  192.   else
  193.   {
  194.     SysTick->CTRL &= SysTick_CLKSource_HCLK_Div8;
  195.   }
  196. }
  197. /**
  198.   * @}
  199.   */
  200. /**
  201.   * @}
  202.   */
  203. /**
  204.   * @}
  205.   */
  206. /******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/
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