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