1 /**
2 ******************************************************************************
3 * @file misc.c
4 * @author MCD Application Team
5 * @version V1.4.0
6 * @date 04-August-2014
7 * @brief This file provides all the miscellaneous firmware functions (add-on
8 * to CMSIS functions).
9 *
10 * @verbatim
11 *
12 * ===================================================================
13 * How to configure Interrupts using driver
14 * ===================================================================
15 *
16 * This section provide functions allowing to configure the NVIC interrupts (IRQ).
17 * The Cortex-M4 exceptions are managed by CMSIS functions.
18 *
19 * 1. Configure the NVIC Priority Grouping using NVIC_PriorityGroupConfig()
20 * function according to the following table.
21
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 * ==========================================================================================================================
42 *
43 * 2. Enable and Configure the priority of the selected IRQ Channels using NVIC_Init()
44 *
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.
47 *
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)
52 *
53 * @endverbatim
54 *
55 ******************************************************************************
56 * @attention
57 *
58 * <h2><center>© COPYRIGHT 2014 STMicroelectronics</center></h2>
59 *
60 * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
61 * You may not use this file except in compliance with the License.
62 * You may obtain a copy of the License at:
63 *
64 * http://www.st.com/software_license_agreement_liberty_v2
65 *
66 * Unless required by applicable law or agreed to in writing, software
67 * distributed under the License is distributed on an "AS IS" BASIS,
68 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
69 * See the License for the specific language governing permissions and
70 * limitations under the License.
71 *
72 ******************************************************************************
73 */
74
75 /* Includes ------------------------------------------------------------------*/
76 #include "misc.h"
77 #include "stm32f4xx_conf.h"
78
79 /** @addtogroup STM32F4xx_StdPeriph_Driver
80 * @{
81 */
82
83 /** @defgroup MISC
84 * @brief MISC driver modules
85 * @{
86 */
87
88 /* Private typedef -----------------------------------------------------------*/
89 /* Private define ------------------------------------------------------------*/
90 #define AIRCR_VECTKEY_MASK ((uint32_t)0x05FA0000)
91
92 /* Private macro -------------------------------------------------------------*/
93 /* Private variables ---------------------------------------------------------*/
94 /* Private function prototypes -----------------------------------------------*/
95 /* Private functions ---------------------------------------------------------*/
96
97 /** @defgroup MISC_Private_Functions
98 * @{
99 */
100
101 /**
102 * @brief Configures the priority grouping: pre-emption priority and subpriority.
103 * @param NVIC_PriorityGroup: specifies the priority grouping bits length.
104 * This parameter can be one of the following values:
105 * @arg NVIC_PriorityGroup_0: 0 bits for pre-emption priority
106 * 4 bits for subpriority
107 * @arg NVIC_PriorityGroup_1: 1 bits for pre-emption priority
108 * 3 bits for subpriority
109 * @arg NVIC_PriorityGroup_2: 2 bits for pre-emption priority
110 * 2 bits for subpriority
111 * @arg NVIC_PriorityGroup_3: 3 bits for pre-emption priority
112 * 1 bits for subpriority
113 * @arg NVIC_PriorityGroup_4: 4 bits for pre-emption priority
114 * 0 bits for subpriority
115 * @note When the NVIC_PriorityGroup_0 is selected, IRQ pre-emption is no more possible.
116 * The pending IRQ priority will be managed only by the subpriority.
117 * @retval None
118 */
NVIC_PriorityGroupConfig(uint32_t NVIC_PriorityGroup)119 void NVIC_PriorityGroupConfig(uint32_t NVIC_PriorityGroup)
120 {
121 /* Check the parameters */
122 assert_param(IS_NVIC_PRIORITY_GROUP(NVIC_PriorityGroup));
123
124 /* Set the PRIGROUP[10:8] bits according to NVIC_PriorityGroup value */
125 SCB->AIRCR = AIRCR_VECTKEY_MASK | NVIC_PriorityGroup;
126 }
127
128 /**
129 * @brief Initializes the NVIC peripheral according to the specified
130 * parameters in the NVIC_InitStruct.
131 * @note To configure interrupts priority correctly, the NVIC_PriorityGroupConfig()
132 * function should be called before.
133 * @param NVIC_InitStruct: pointer to a NVIC_InitTypeDef structure that contains
134 * the configuration information for the specified NVIC peripheral.
135 * @retval None
136 */
NVIC_Init(NVIC_InitTypeDef * NVIC_InitStruct)137 void NVIC_Init(NVIC_InitTypeDef* NVIC_InitStruct)
138 {
139 uint8_t tmppriority = 0x00, tmppre = 0x00, tmpsub = 0x0F;
140
141 /* Check the parameters */
142 assert_param(IS_FUNCTIONAL_STATE(NVIC_InitStruct->NVIC_IRQChannelCmd));
143 assert_param(IS_NVIC_PREEMPTION_PRIORITY(NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority));
144 assert_param(IS_NVIC_SUB_PRIORITY(NVIC_InitStruct->NVIC_IRQChannelSubPriority));
145
146 if (NVIC_InitStruct->NVIC_IRQChannelCmd != DISABLE)
147 {
148 /* Compute the Corresponding IRQ Priority --------------------------------*/
149 tmppriority = (0x700 - ((SCB->AIRCR) & (uint32_t)0x700))>> 0x08;
150 tmppre = (0x4 - tmppriority);
151 tmpsub = tmpsub >> tmppriority;
152
153 tmppriority = NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority << tmppre;
154 tmppriority |= (uint8_t)(NVIC_InitStruct->NVIC_IRQChannelSubPriority & tmpsub);
155
156 tmppriority = tmppriority << 0x04;
157
158 NVIC->IP[NVIC_InitStruct->NVIC_IRQChannel] = tmppriority;
159
160 /* Enable the Selected IRQ Channels --------------------------------------*/
161 NVIC->ISER[NVIC_InitStruct->NVIC_IRQChannel >> 0x05] =
162 (uint32_t)0x01 << (NVIC_InitStruct->NVIC_IRQChannel & (uint8_t)0x1F);
163 }
164 else
165 {
166 /* Disable the Selected IRQ Channels -------------------------------------*/
167 NVIC->ICER[NVIC_InitStruct->NVIC_IRQChannel >> 0x05] =
168 (uint32_t)0x01 << (NVIC_InitStruct->NVIC_IRQChannel & (uint8_t)0x1F);
169 }
170 }
171
172 /**
173 * @brief Sets the vector table location and Offset.
174 * @param NVIC_VectTab: specifies if the vector table is in RAM or FLASH memory.
175 * This parameter can be one of the following values:
176 * @arg NVIC_VectTab_RAM: Vector Table in internal SRAM.
177 * @arg NVIC_VectTab_FLASH: Vector Table in internal FLASH.
178 * @param Offset: Vector Table base offset field. This value must be a multiple of 0x200.
179 * @retval None
180 */
NVIC_SetVectorTable(uint32_t NVIC_VectTab,uint32_t Offset)181 void NVIC_SetVectorTable(uint32_t NVIC_VectTab, uint32_t Offset)
182 {
183 /* Check the parameters */
184 assert_param(IS_NVIC_VECTTAB(NVIC_VectTab));
185 assert_param(IS_NVIC_OFFSET(Offset));
186
187 SCB->VTOR = NVIC_VectTab | (Offset & (uint32_t)0x1FFFFF80);
188 }
189
190 /**
191 * @brief Selects the condition for the system to enter low power mode.
192 * @param LowPowerMode: Specifies the new mode for the system to enter low power mode.
193 * This parameter can be one of the following values:
194 * @arg NVIC_LP_SEVONPEND: Low Power SEV on Pend.
195 * @arg NVIC_LP_SLEEPDEEP: Low Power DEEPSLEEP request.
196 * @arg NVIC_LP_SLEEPONEXIT: Low Power Sleep on Exit.
197 * @param NewState: new state of LP condition. This parameter can be: ENABLE or DISABLE.
198 * @retval None
199 */
NVIC_SystemLPConfig(uint8_t LowPowerMode,FunctionalState NewState)200 void NVIC_SystemLPConfig(uint8_t LowPowerMode, FunctionalState NewState)
201 {
202 /* Check the parameters */
203 assert_param(IS_NVIC_LP(LowPowerMode));
204 assert_param(IS_FUNCTIONAL_STATE(NewState));
205
206 if (NewState != DISABLE)
207 {
208 SCB->SCR |= LowPowerMode;
209 }
210 else
211 {
212 SCB->SCR &= (uint32_t)(~(uint32_t)LowPowerMode);
213 }
214 }
215
216 /**
217 * @brief Configures the SysTick clock source.
218 * @param SysTick_CLKSource: specifies the SysTick clock source.
219 * This parameter can be one of the following values:
220 * @arg SysTick_CLKSource_HCLK_Div8: AHB clock divided by 8 selected as SysTick clock source.
221 * @arg SysTick_CLKSource_HCLK: AHB clock selected as SysTick clock source.
222 * @retval None
223 */
SysTick_CLKSourceConfig(uint32_t SysTick_CLKSource)224 void SysTick_CLKSourceConfig(uint32_t SysTick_CLKSource)
225 {
226 /* Check the parameters */
227 assert_param(IS_SYSTICK_CLK_SOURCE(SysTick_CLKSource));
228 if (SysTick_CLKSource == SysTick_CLKSource_HCLK)
229 {
230 SysTick->CTRL |= SysTick_CLKSource_HCLK;
231 }
232 else
233 {
234 SysTick->CTRL &= SysTick_CLKSource_HCLK_Div8;
235 }
236 }
237
238 /**
239 * @}
240 */
241
242 /**
243 * @}
244 */
245
246 /**
247 * @}
248 */
249
250 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
251