1 /**
2 ******************************************************************************
3 * @file misc.c
4 * @author MCD Application Team
5 * @version V1.5.1
6 * @date 22-May-2015
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 2015 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
78 /** @addtogroup STM32F4xx_StdPeriph_Driver
79 * @{
80 */
81
82 /** @defgroup MISC
83 * @brief MISC driver modules
84 * @{
85 */
86
87 /* Private typedef -----------------------------------------------------------*/
88 /* Private define ------------------------------------------------------------*/
89 #define AIRCR_VECTKEY_MASK ((uint32_t)0x05FA0000)
90
91 /* Private macro -------------------------------------------------------------*/
92 /* Private variables ---------------------------------------------------------*/
93 /* Private function prototypes -----------------------------------------------*/
94 /* Private functions ---------------------------------------------------------*/
95
96 /** @defgroup MISC_Private_Functions
97 * @{
98 */
99
100 /**
101 * @brief Configures the priority grouping: pre-emption priority and subpriority.
102 * @param NVIC_PriorityGroup: specifies the priority grouping bits length.
103 * This parameter can be one of the following values:
104 * @arg NVIC_PriorityGroup_0: 0 bits for pre-emption priority
105 * 4 bits for subpriority
106 * @arg NVIC_PriorityGroup_1: 1 bits for pre-emption priority
107 * 3 bits for subpriority
108 * @arg NVIC_PriorityGroup_2: 2 bits for pre-emption priority
109 * 2 bits for subpriority
110 * @arg NVIC_PriorityGroup_3: 3 bits for pre-emption priority
111 * 1 bits for subpriority
112 * @arg NVIC_PriorityGroup_4: 4 bits for pre-emption priority
113 * 0 bits for subpriority
114 * @note When the NVIC_PriorityGroup_0 is selected, IRQ pre-emption is no more possible.
115 * The pending IRQ priority will be managed only by the subpriority.
116 * @retval None
117 */
NVIC_PriorityGroupConfig(uint32_t NVIC_PriorityGroup)118 void NVIC_PriorityGroupConfig(uint32_t NVIC_PriorityGroup)
119 {
120 /* Check the parameters */
121 assert_param(IS_NVIC_PRIORITY_GROUP(NVIC_PriorityGroup));
122
123 /* Set the PRIGROUP[10:8] bits according to NVIC_PriorityGroup value */
124 SCB->AIRCR = AIRCR_VECTKEY_MASK | NVIC_PriorityGroup;
125 }
126
127 /**
128 * @brief Initializes the NVIC peripheral according to the specified
129 * parameters in the NVIC_InitStruct.
130 * @note To configure interrupts priority correctly, the NVIC_PriorityGroupConfig()
131 * function should be called before.
132 * @param NVIC_InitStruct: pointer to a NVIC_InitTypeDef structure that contains
133 * the configuration information for the specified NVIC peripheral.
134 * @retval None
135 */
NVIC_Init(NVIC_InitTypeDef * NVIC_InitStruct)136 void NVIC_Init(NVIC_InitTypeDef* NVIC_InitStruct)
137 {
138 uint8_t tmppriority = 0x00, tmppre = 0x00, tmpsub = 0x0F;
139
140 /* Check the parameters */
141 assert_param(IS_FUNCTIONAL_STATE(NVIC_InitStruct->NVIC_IRQChannelCmd));
142 assert_param(IS_NVIC_PREEMPTION_PRIORITY(NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority));
143 assert_param(IS_NVIC_SUB_PRIORITY(NVIC_InitStruct->NVIC_IRQChannelSubPriority));
144
145 if (NVIC_InitStruct->NVIC_IRQChannelCmd != DISABLE)
146 {
147 /* Compute the Corresponding IRQ Priority --------------------------------*/
148 tmppriority = (0x700 - ((SCB->AIRCR) & (uint32_t)0x700))>> 0x08;
149 tmppre = (0x4 - tmppriority);
150 tmpsub = tmpsub >> tmppriority;
151
152 tmppriority = NVIC_InitStruct->NVIC_IRQChannelPreemptionPriority << tmppre;
153 tmppriority |= (uint8_t)(NVIC_InitStruct->NVIC_IRQChannelSubPriority & tmpsub);
154
155 tmppriority = tmppriority << 0x04;
156
157 NVIC->IP[NVIC_InitStruct->NVIC_IRQChannel] = tmppriority;
158
159 /* Enable the Selected IRQ Channels --------------------------------------*/
160 NVIC->ISER[NVIC_InitStruct->NVIC_IRQChannel >> 0x05] =
161 (uint32_t)0x01 << (NVIC_InitStruct->NVIC_IRQChannel & (uint8_t)0x1F);
162 }
163 else
164 {
165 /* Disable the Selected IRQ Channels -------------------------------------*/
166 NVIC->ICER[NVIC_InitStruct->NVIC_IRQChannel >> 0x05] =
167 (uint32_t)0x01 << (NVIC_InitStruct->NVIC_IRQChannel & (uint8_t)0x1F);
168 }
169 }
170
171 /**
172 * @brief Sets the vector table location and Offset.
173 * @param NVIC_VectTab: specifies if the vector table is in RAM or FLASH memory.
174 * This parameter can be one of the following values:
175 * @arg NVIC_VectTab_RAM: Vector Table in internal SRAM.
176 * @arg NVIC_VectTab_FLASH: Vector Table in internal FLASH.
177 * @param Offset: Vector Table base offset field. This value must be a multiple of 0x200.
178 * @retval None
179 */
NVIC_SetVectorTable(uint32_t NVIC_VectTab,uint32_t Offset)180 void NVIC_SetVectorTable(uint32_t NVIC_VectTab, uint32_t Offset)
181 {
182 /* Check the parameters */
183 assert_param(IS_NVIC_VECTTAB(NVIC_VectTab));
184 assert_param(IS_NVIC_OFFSET(Offset));
185
186 SCB->VTOR = NVIC_VectTab | (Offset & (uint32_t)0x1FFFFF80);
187 }
188
189 /**
190 * @brief Selects the condition for the system to enter low power mode.
191 * @param LowPowerMode: Specifies the new mode for the system to enter low power mode.
192 * This parameter can be one of the following values:
193 * @arg NVIC_LP_SEVONPEND: Low Power SEV on Pend.
194 * @arg NVIC_LP_SLEEPDEEP: Low Power DEEPSLEEP request.
195 * @arg NVIC_LP_SLEEPONEXIT: Low Power Sleep on Exit.
196 * @param NewState: new state of LP condition. This parameter can be: ENABLE or DISABLE.
197 * @retval None
198 */
NVIC_SystemLPConfig(uint8_t LowPowerMode,FunctionalState NewState)199 void NVIC_SystemLPConfig(uint8_t LowPowerMode, FunctionalState NewState)
200 {
201 /* Check the parameters */
202 assert_param(IS_NVIC_LP(LowPowerMode));
203 assert_param(IS_FUNCTIONAL_STATE(NewState));
204
205 if (NewState != DISABLE)
206 {
207 SCB->SCR |= LowPowerMode;
208 }
209 else
210 {
211 SCB->SCR &= (uint32_t)(~(uint32_t)LowPowerMode);
212 }
213 }
214
215 /**
216 * @brief Configures the SysTick clock source.
217 * @param SysTick_CLKSource: specifies the SysTick clock source.
218 * This parameter can be one of the following values:
219 * @arg SysTick_CLKSource_HCLK_Div8: AHB clock divided by 8 selected as SysTick clock source.
220 * @arg SysTick_CLKSource_HCLK: AHB clock selected as SysTick clock source.
221 * @retval None
222 */
SysTick_CLKSourceConfig(uint32_t SysTick_CLKSource)223 void SysTick_CLKSourceConfig(uint32_t SysTick_CLKSource)
224 {
225 /* Check the parameters */
226 assert_param(IS_SYSTICK_CLK_SOURCE(SysTick_CLKSource));
227 if (SysTick_CLKSource == SysTick_CLKSource_HCLK)
228 {
229 SysTick->CTRL |= SysTick_CLKSource_HCLK;
230 }
231 else
232 {
233 SysTick->CTRL &= SysTick_CLKSource_HCLK_Div8;
234 }
235 }
236
237 /**
238 * @}
239 */
240
241 /**
242 * @}
243 */
244
245 /**
246 * @}
247 */
248
249 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
250