2 ******************************************************************************
4 * @author MCD Application Team
7 * @brief This file provides all the miscellaneous firmware functions (add-on
12 * ===================================================================
13 * How to configure Interrupts using driver
14 * ===================================================================
16 * This section provide functions allowing to configure the NVIC interrupts (IRQ).
17 * The Cortex-M4 exceptions are managed by CMSIS functions.
19 * 1. Configure the NVIC Priority Grouping using NVIC_PriorityGroupConfig()
20 * function according to the following table.
22 * The table below gives the allowed values of the pre-emption priority and subpriority according
23 * to the Priority Grouping configuration performed by NVIC_PriorityGroupConfig function
24 * ==========================================================================================================================
25 * NVIC_PriorityGroup | NVIC_IRQChannelPreemptionPriority | NVIC_IRQChannelSubPriority | Description
26 * ==========================================================================================================================
27 * NVIC_PriorityGroup_0 | 0 | 0-15 | 0 bits for pre-emption priority
28 * | | | 4 bits for subpriority
29 * --------------------------------------------------------------------------------------------------------------------------
30 * NVIC_PriorityGroup_1 | 0-1 | 0-7 | 1 bits for pre-emption priority
31 * | | | 3 bits for subpriority
32 * --------------------------------------------------------------------------------------------------------------------------
33 * NVIC_PriorityGroup_2 | 0-3 | 0-3 | 2 bits for pre-emption priority
34 * | | | 2 bits for subpriority
35 * --------------------------------------------------------------------------------------------------------------------------
36 * NVIC_PriorityGroup_3 | 0-7 | 0-1 | 3 bits for pre-emption priority
37 * | | | 1 bits for subpriority
38 * --------------------------------------------------------------------------------------------------------------------------
39 * NVIC_PriorityGroup_4 | 0-15 | 0 | 4 bits for pre-emption priority
40 * | | | 0 bits for subpriority
41 * ==========================================================================================================================
43 * 2. Enable and Configure the priority of the selected IRQ Channels using NVIC_Init()
45 * @note When the NVIC_PriorityGroup_0 is selected, IRQ pre-emption is no more possible.
46 * The pending IRQ priority will be managed only by the subpriority.
48 * @note IRQ priority order (sorted by highest to lowest priority):
49 * - Lowest pre-emption priority
50 * - Lowest subpriority
51 * - Lowest hardware priority (IRQ number)
55 ******************************************************************************
58 * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
59 * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
60 * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
61 * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
62 * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
63 * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
65 * <h2><center>© COPYRIGHT 2011 STMicroelectronics</center></h2>
66 ******************************************************************************
69 /* Includes ------------------------------------------------------------------*/
72 /** @addtogroup STM32F4xx_StdPeriph_Driver
77 * @brief MISC driver modules
81 /* Private typedef -----------------------------------------------------------*/
82 /* Private define ------------------------------------------------------------*/
83 #define AIRCR_VECTKEY_MASK ((uint32_t)0x05FA0000)
85 /* Private macro -------------------------------------------------------------*/
86 /* Private variables ---------------------------------------------------------*/
87 /* Private function prototypes -----------------------------------------------*/
88 /* Private functions ---------------------------------------------------------*/
90 /** @defgroup MISC_Private_Functions
95 * @brief Configures the priority grouping: pre-emption priority and subpriority.
96 * @param NVIC_PriorityGroup: specifies the priority grouping bits length.
97 * This parameter can be one of the following values:
98 * @arg NVIC_PriorityGroup_0: 0 bits for pre-emption priority
99 * 4 bits for subpriority
100 * @arg NVIC_PriorityGroup_1: 1 bits for pre-emption priority
101 * 3 bits for subpriority
102 * @arg NVIC_PriorityGroup_2: 2 bits for pre-emption priority
103 * 2 bits for subpriority
104 * @arg NVIC_PriorityGroup_3: 3 bits for pre-emption priority
105 * 1 bits for subpriority
106 * @arg NVIC_PriorityGroup_4: 4 bits for pre-emption priority
107 * 0 bits for subpriority
108 * @note When the NVIC_PriorityGroup_0 is selected, IRQ pre-emption is no more possible.
109 * The pending IRQ priority will be managed only by the subpriority.
112 void NVIC_PriorityGroupConfig(uint32_t NVIC_PriorityGroup)
114 /* Check the parameters */
115 assert_param(IS_NVIC_PRIORITY_GROUP(NVIC_PriorityGroup));
117 /* Set the PRIGROUP[10:8] bits according to NVIC_PriorityGroup value */
118 SCB->AIRCR = AIRCR_VECTKEY_MASK | NVIC_PriorityGroup;
122 * @brief Initializes the NVIC peripheral according to the specified
123 * parameters in the NVIC_InitStruct.
124 * @note To configure interrupts priority correctly, the NVIC_PriorityGroupConfig()
125 * function should be called before.
126 * @param NVIC_InitStruct: pointer to a NVIC_InitTypeDef structure that contains
127 * the configuration information for the specified NVIC peripheral.
130 void NVIC_Init(NVIC_InitTypeDef* NVIC_InitStruct)
132 uint8_t tmppriority = 0x00, tmppre = 0x00, tmpsub = 0x0F;
134 /* Check the parameters */
135 assert_param(IS_FUNCTIONAL_STATE(NVIC_InitStruct->NVIC_IRQChannelCmd));
136 assert_param(IS_NVIC_PREEMPTION_PRIORITY(NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority));
137 assert_param(IS_NVIC_SUB_PRIORITY(NVIC_InitStruct->NVIC_IRQChannelSubPriority));
139 if (NVIC_InitStruct->NVIC_IRQChannelCmd != DISABLE)
141 /* Compute the Corresponding IRQ Priority --------------------------------*/
142 tmppriority = (0x700 - ((SCB->AIRCR) & (uint32_t)0x700))>> 0x08;
143 tmppre = (0x4 - tmppriority);
144 tmpsub = tmpsub >> tmppriority;
146 tmppriority = NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority << tmppre;
147 tmppriority |= (uint8_t)(NVIC_InitStruct->NVIC_IRQChannelSubPriority & tmpsub);
149 tmppriority = tmppriority << 0x04;
151 NVIC->IP[NVIC_InitStruct->NVIC_IRQChannel] = tmppriority;
153 /* Enable the Selected IRQ Channels --------------------------------------*/
154 NVIC->ISER[NVIC_InitStruct->NVIC_IRQChannel >> 0x05] =
155 (uint32_t)0x01 << (NVIC_InitStruct->NVIC_IRQChannel & (uint8_t)0x1F);
159 /* Disable the Selected IRQ Channels -------------------------------------*/
160 NVIC->ICER[NVIC_InitStruct->NVIC_IRQChannel >> 0x05] =
161 (uint32_t)0x01 << (NVIC_InitStruct->NVIC_IRQChannel & (uint8_t)0x1F);
166 * @brief Sets the vector table location and Offset.
167 * @param NVIC_VectTab: specifies if the vector table is in RAM or FLASH memory.
168 * This parameter can be one of the following values:
169 * @arg NVIC_VectTab_RAM: Vector Table in internal SRAM.
170 * @arg NVIC_VectTab_FLASH: Vector Table in internal FLASH.
171 * @param Offset: Vector Table base offset field. This value must be a multiple of 0x200.
174 void NVIC_SetVectorTable(uint32_t NVIC_VectTab, uint32_t Offset)
176 /* Check the parameters */
177 assert_param(IS_NVIC_VECTTAB(NVIC_VectTab));
178 assert_param(IS_NVIC_OFFSET(Offset));
180 SCB->VTOR = NVIC_VectTab | (Offset & (uint32_t)0x1FFFFF80);
184 * @brief Selects the condition for the system to enter low power mode.
185 * @param LowPowerMode: Specifies the new mode for the system to enter low power mode.
186 * This parameter can be one of the following values:
187 * @arg NVIC_LP_SEVONPEND: Low Power SEV on Pend.
188 * @arg NVIC_LP_SLEEPDEEP: Low Power DEEPSLEEP request.
189 * @arg NVIC_LP_SLEEPONEXIT: Low Power Sleep on Exit.
190 * @param NewState: new state of LP condition. This parameter can be: ENABLE or DISABLE.
193 void NVIC_SystemLPConfig(uint8_t LowPowerMode, FunctionalState NewState)
195 /* Check the parameters */
196 assert_param(IS_NVIC_LP(LowPowerMode));
197 assert_param(IS_FUNCTIONAL_STATE(NewState));
199 if (NewState != DISABLE)
201 SCB->SCR |= LowPowerMode;
205 SCB->SCR &= (uint32_t)(~(uint32_t)LowPowerMode);
210 * @brief Configures the SysTick clock source.
211 * @param SysTick_CLKSource: specifies the SysTick clock source.
212 * This parameter can be one of the following values:
213 * @arg SysTick_CLKSource_HCLK_Div8: AHB clock divided by 8 selected as SysTick clock source.
214 * @arg SysTick_CLKSource_HCLK: AHB clock selected as SysTick clock source.
217 void SysTick_CLKSourceConfig(uint32_t SysTick_CLKSource)
219 /* Check the parameters */
220 assert_param(IS_SYSTICK_CLK_SOURCE(SysTick_CLKSource));
221 if (SysTick_CLKSource == SysTick_CLKSource_HCLK)
223 SysTick->CTRL |= SysTick_CLKSource_HCLK;
227 SysTick->CTRL &= SysTick_CLKSource_HCLK_Div8;
243 /******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/