ref: 6f14d3a3a15f85c47b1b146c5b82c21f015a4536
dir: /demos/stm32f429_disco/stm/stm32f4_spl/src/misc.c/
/**
******************************************************************************
* @file misc.c
* @author MCD Application Team
* @version V1.3.0
* @date 08-November-2013
* @brief This file provides all the miscellaneous firmware functions (add-on
* to CMSIS functions).
*
* @verbatim
*
* ===================================================================
* How to configure Interrupts using driver
* ===================================================================
*
* This section provide functions allowing to configure the NVIC interrupts (IRQ).
* The Cortex-M4 exceptions are managed by CMSIS functions.
*
* 1. Configure the NVIC Priority Grouping using NVIC_PriorityGroupConfig()
* function according to the following table.
* The table below gives the allowed values of the pre-emption 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 pre-emption priority
* | | | 4 bits for subpriority
* --------------------------------------------------------------------------------------------------------------------------
* NVIC_PriorityGroup_1 | 0-1 | 0-7 | 1 bits for pre-emption priority
* | | | 3 bits for subpriority
* --------------------------------------------------------------------------------------------------------------------------
* NVIC_PriorityGroup_2 | 0-3 | 0-3 | 2 bits for pre-emption priority
* | | | 2 bits for subpriority
* --------------------------------------------------------------------------------------------------------------------------
* NVIC_PriorityGroup_3 | 0-7 | 0-1 | 3 bits for pre-emption priority
* | | | 1 bits for subpriority
* --------------------------------------------------------------------------------------------------------------------------
* NVIC_PriorityGroup_4 | 0-15 | 0 | 4 bits for pre-emption priority
* | | | 0 bits for subpriority
* ==========================================================================================================================
*
* 2. Enable and Configure the priority of the selected IRQ Channels using NVIC_Init()
*
* @note When the NVIC_PriorityGroup_0 is selected, IRQ pre-emption is no more possible.
* The pending IRQ priority will be managed only by the subpriority.
*
* @note IRQ priority order (sorted by highest to lowest priority):
* - Lowest pre-emption priority
* - Lowest subpriority
* - Lowest hardware priority (IRQ number)
*
* @endverbatim
*
******************************************************************************
* @attention
*
* <h2><center>© COPYRIGHT 2013 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 STM32F4xx_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
* @{
*/
/**
* @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
* @note When the NVIC_PriorityGroup_0 is selected, IRQ pre-emption is no more possible.
* The pending IRQ priority will be managed only by the 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 = 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****/