2 ******************************************************************************
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3 * @file stm32l1xx_exti.c
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4 * @author MCD Application Team
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6 * @date 31-December-2010
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7 * @brief This file provides firmware functions to manage the following
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8 * functionalities of the EXTI peripheral:
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9 * - Initialization and Configuration
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10 * - Interrupts and flags management
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14 * ===================================================================
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16 * ===================================================================
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18 * External interrupt/event lines are mapped as following:
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19 * 1- All available GPIO pins are connected to the 16 external
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20 * interrupt/event lines from EXTI0 to EXTI15.
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21 * 2- EXTI line 16 is connected to the PVD output
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22 * 3- EXTI line 17 is connected to the RTC Alarm event
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23 * 4- EXTI line 18 is connected to the USB Device FS wakeup event
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24 * 5- EXTI line 19 is connected to the RTC Tamper and TimeStamp events
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25 * 6- EXTI line 20 is connected to the RTC Wakeup event
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26 * 7- EXTI line 21 is connected to the Comparator 1 wakeup event
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27 * 8- EXTI line 22 is connected to the Comparator 2 wakeup event
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29 * ===================================================================
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30 * How to use this driver
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31 * ===================================================================
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33 * In order to use an I/O pin as an external interrupt source, follow
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35 * 1- Configure the I/O in input mode using GPIO_Init()
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36 * 2- Select the input source pin for the EXTI line using
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37 * SYSCFG_EXTILineConfig()
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38 * 3- Select the mode(interrupt, event) and configure the trigger
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39 * selection (Rising, falling or both) using EXTI_Init()
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40 * 4- Configure NVIC IRQ channel mapped to the EXTI line using NVIC_Init()
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42 *@note SYSCFG APB clock must be enabled to get write access to SYSCFG_EXTICRx
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43 * registers using RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
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47 ******************************************************************************
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50 * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
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51 * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
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52 * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
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53 * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
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54 * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
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55 * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
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57 * <h2><center>© COPYRIGHT 2010 STMicroelectronics</center></h2>
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58 ******************************************************************************
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61 /* Includes ------------------------------------------------------------------*/
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62 #include "stm32l1xx_exti.h"
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64 /** @addtogroup STM32L1xx_StdPeriph_Driver
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69 * @brief EXTI driver modules
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73 /* Private typedef -----------------------------------------------------------*/
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74 /* Private define ------------------------------------------------------------*/
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75 #define EXTI_LINENONE ((uint32_t)0x00000) /* No interrupt selected */
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77 /* Private macro -------------------------------------------------------------*/
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78 /* Private variables ---------------------------------------------------------*/
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79 /* Private function prototypes -----------------------------------------------*/
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80 /* Private functions ---------------------------------------------------------*/
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82 /** @defgroup EXTI_Private_Functions
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86 /** @defgroup EXTI_Group1 Initialization and Configuration functions
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87 * @brief Initialization and Configuration functions
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90 ===============================================================================
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91 Initialization and Configuration functions
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92 ===============================================================================
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99 * @brief Deinitializes the EXTI peripheral registers to their default reset values.
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103 void EXTI_DeInit(void)
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105 EXTI->IMR = 0x00000000;
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106 EXTI->EMR = 0x00000000;
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107 EXTI->RTSR = 0x00000000;
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108 EXTI->FTSR = 0x00000000;
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109 EXTI->PR = 0x007FFFFF;
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113 * @brief Initializes the EXTI peripheral according to the specified
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114 * parameters in the EXTI_InitStruct.
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115 * EXTI_Line specifies the EXTI line (EXTI0....EXTI22)
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116 * EXTI_Mode specifies which EXTI line is used as interrupt or an event
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117 * EXTI_Trigger selects the trigger. When the trigger occurs, interrupt
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118 * pending bit will be set
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119 * EXTI_LineCmd controls (Enable/Disable) the EXTI line
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120 * @param EXTI_InitStruct: pointer to a EXTI_InitTypeDef structure
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121 * that contains the configuration information for the EXTI peripheral.
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124 void EXTI_Init(EXTI_InitTypeDef* EXTI_InitStruct)
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128 /* Check the parameters */
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129 assert_param(IS_EXTI_MODE(EXTI_InitStruct->EXTI_Mode));
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130 assert_param(IS_EXTI_TRIGGER(EXTI_InitStruct->EXTI_Trigger));
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131 assert_param(IS_EXTI_LINE(EXTI_InitStruct->EXTI_Line));
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132 assert_param(IS_FUNCTIONAL_STATE(EXTI_InitStruct->EXTI_LineCmd));
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134 tmp = (uint32_t)EXTI_BASE;
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136 if (EXTI_InitStruct->EXTI_LineCmd != DISABLE)
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138 /* Clear EXTI line configuration */
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139 EXTI->IMR &= ~EXTI_InitStruct->EXTI_Line;
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140 EXTI->EMR &= ~EXTI_InitStruct->EXTI_Line;
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142 tmp += EXTI_InitStruct->EXTI_Mode;
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144 *(__IO uint32_t *) tmp |= EXTI_InitStruct->EXTI_Line;
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146 /* Clear Rising Falling edge configuration */
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147 EXTI->RTSR &= ~EXTI_InitStruct->EXTI_Line;
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148 EXTI->FTSR &= ~EXTI_InitStruct->EXTI_Line;
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150 /* Select the trigger for the selected external interrupts */
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151 if (EXTI_InitStruct->EXTI_Trigger == EXTI_Trigger_Rising_Falling)
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153 /* Rising Falling edge */
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154 EXTI->RTSR |= EXTI_InitStruct->EXTI_Line;
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155 EXTI->FTSR |= EXTI_InitStruct->EXTI_Line;
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159 tmp = (uint32_t)EXTI_BASE;
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160 tmp += EXTI_InitStruct->EXTI_Trigger;
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162 *(__IO uint32_t *) tmp |= EXTI_InitStruct->EXTI_Line;
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167 tmp += EXTI_InitStruct->EXTI_Mode;
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169 /* Disable the selected external lines */
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170 *(__IO uint32_t *) tmp &= ~EXTI_InitStruct->EXTI_Line;
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175 * @brief Fills each EXTI_InitStruct member with its reset value.
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176 * @param EXTI_InitStruct: pointer to a EXTI_InitTypeDef structure which will
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180 void EXTI_StructInit(EXTI_InitTypeDef* EXTI_InitStruct)
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182 EXTI_InitStruct->EXTI_Line = EXTI_LINENONE;
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183 EXTI_InitStruct->EXTI_Mode = EXTI_Mode_Interrupt;
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184 EXTI_InitStruct->EXTI_Trigger = EXTI_Trigger_Falling;
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185 EXTI_InitStruct->EXTI_LineCmd = DISABLE;
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189 * @brief Generates a Software interrupt on selected EXTI line.
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190 * @param EXTI_Line: specifies the EXTI line on which the software interrupt
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191 * will be generated.
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192 * This parameter can be any combination of EXTI_Linex where x can be (0..22).
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195 void EXTI_GenerateSWInterrupt(uint32_t EXTI_Line)
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197 /* Check the parameters */
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198 assert_param(IS_EXTI_LINE(EXTI_Line));
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200 EXTI->SWIER |= EXTI_Line;
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207 /** @defgroup EXTI_Group2 Interrupts and flags management functions
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208 * @brief Interrupts and flags management functions
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211 ===============================================================================
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212 Interrupts and flags management functions
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213 ===============================================================================
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220 * @brief Checks whether the specified EXTI line flag is set or not.
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221 * @param EXTI_Line: specifies the EXTI line flag to check.
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222 * This parameter can be:
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223 * @arg EXTI_Linex: External interrupt line x where x(0..22)
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224 * @retval The new state of EXTI_Line (SET or RESET).
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226 FlagStatus EXTI_GetFlagStatus(uint32_t EXTI_Line)
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228 FlagStatus bitstatus = RESET;
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229 /* Check the parameters */
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230 assert_param(IS_GET_EXTI_LINE(EXTI_Line));
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232 if ((EXTI->PR & EXTI_Line) != (uint32_t)RESET)
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244 * @brief Clears the EXTI
\92s line pending flags.
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245 * @param EXTI_Line: specifies the EXTI lines flags to clear.
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246 * This parameter can be any combination of EXTI_Linex where x can be (0..22).
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249 void EXTI_ClearFlag(uint32_t EXTI_Line)
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251 /* Check the parameters */
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252 assert_param(IS_EXTI_LINE(EXTI_Line));
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254 EXTI->PR = EXTI_Line;
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258 * @brief Checks whether the specified EXTI line is asserted or not.
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259 * @param EXTI_Line: specifies the EXTI line to check.
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260 * This parameter can be:
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261 * @arg EXTI_Linex: External interrupt line x where x(0..22)
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262 * @retval The new state of EXTI_Line (SET or RESET).
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264 ITStatus EXTI_GetITStatus(uint32_t EXTI_Line)
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266 ITStatus bitstatus = RESET;
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267 uint32_t enablestatus = 0;
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268 /* Check the parameters */
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269 assert_param(IS_GET_EXTI_LINE(EXTI_Line));
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271 enablestatus = EXTI->IMR & EXTI_Line;
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272 if (((EXTI->PR & EXTI_Line) != (uint32_t)RESET) && (enablestatus != (uint32_t)RESET))
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284 * @brief Clears the EXTI
\92s line pending bits.
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285 * @param EXTI_Line: specifies the EXTI lines to clear.
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286 * This parameter can be any combination of EXTI_Linex where x can be (0..22).
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289 void EXTI_ClearITPendingBit(uint32_t EXTI_Line)
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291 /* Check the parameters */
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292 assert_param(IS_EXTI_LINE(EXTI_Line));
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294 EXTI->PR = EXTI_Line;
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313 /******************* (C) COPYRIGHT 2010 STMicroelectronics *****END OF FILE****/
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