/** ****************************************************************************** * @file misc.c * @author MCD Application Team * @version V1.2.0 * @date 22-February-2013 * @brief This file provides all the miscellaneous firmware functions (add-on * to CMSIS functions). ****************************************************************************** * @attention * *

© COPYRIGHT 2013 STMicroelectronics

* * 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****/