2 ******************************************************************************
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3 * @file stm32l1xx_exti.c
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4 * @author MCD Application Team
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7 * @brief This file provides all the EXTI firmware functions.
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8 ******************************************************************************
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11 * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
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12 * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
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13 * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
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14 * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
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15 * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
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16 * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
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18 * <h2><center>© COPYRIGHT 2010 STMicroelectronics</center></h2>
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21 /* Includes ------------------------------------------------------------------*/
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22 #include "stm32l1xx_exti.h"
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24 /** @addtogroup STM32L1xx_StdPeriph_Driver
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29 * @brief EXTI driver modules
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33 /** @defgroup EXTI_Private_TypesDefinitions
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41 /** @defgroup EXTI_Private_Defines
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45 #define EXTI_LINENONE ((uint32_t)0x00000) /* No interrupt selected */
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51 /** @defgroup EXTI_Private_Macros
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59 /** @defgroup EXTI_Private_Variables
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67 /** @defgroup EXTI_Private_FunctionPrototypes
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75 /** @defgroup EXTI_Private_Functions
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80 * @brief Deinitializes the EXTI peripheral registers to their default reset values.
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84 void EXTI_DeInit(void)
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86 EXTI->IMR = 0x00000000;
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87 EXTI->EMR = 0x00000000;
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88 EXTI->RTSR = 0x00000000;
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89 EXTI->FTSR = 0x00000000;
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90 EXTI->PR = 0x007FFFFF;
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94 * @brief Initializes the EXTI peripheral according to the specified
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95 * parameters in the EXTI_InitStruct.
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96 * @param EXTI_InitStruct: pointer to a EXTI_InitTypeDef structure
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97 * that contains the configuration information for the EXTI peripheral.
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100 void EXTI_Init(EXTI_InitTypeDef* EXTI_InitStruct)
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104 /* Check the parameters */
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105 assert_param(IS_EXTI_MODE(EXTI_InitStruct->EXTI_Mode));
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106 assert_param(IS_EXTI_TRIGGER(EXTI_InitStruct->EXTI_Trigger));
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107 assert_param(IS_EXTI_LINE(EXTI_InitStruct->EXTI_Line));
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108 assert_param(IS_FUNCTIONAL_STATE(EXTI_InitStruct->EXTI_LineCmd));
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110 tmp = (uint32_t)EXTI_BASE;
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112 if (EXTI_InitStruct->EXTI_LineCmd != DISABLE)
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114 /* Clear EXTI line configuration */
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115 EXTI->IMR &= ~EXTI_InitStruct->EXTI_Line;
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116 EXTI->EMR &= ~EXTI_InitStruct->EXTI_Line;
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118 tmp += EXTI_InitStruct->EXTI_Mode;
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120 *(__IO uint32_t *) tmp |= EXTI_InitStruct->EXTI_Line;
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122 /* Clear Rising Falling edge configuration */
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123 EXTI->RTSR &= ~EXTI_InitStruct->EXTI_Line;
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124 EXTI->FTSR &= ~EXTI_InitStruct->EXTI_Line;
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126 /* Select the trigger for the selected external interrupts */
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127 if (EXTI_InitStruct->EXTI_Trigger == EXTI_Trigger_Rising_Falling)
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129 /* Rising Falling edge */
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130 EXTI->RTSR |= EXTI_InitStruct->EXTI_Line;
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131 EXTI->FTSR |= EXTI_InitStruct->EXTI_Line;
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135 tmp = (uint32_t)EXTI_BASE;
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136 tmp += EXTI_InitStruct->EXTI_Trigger;
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138 *(__IO uint32_t *) tmp |= EXTI_InitStruct->EXTI_Line;
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143 tmp += EXTI_InitStruct->EXTI_Mode;
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145 /* Disable the selected external lines */
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146 *(__IO uint32_t *) tmp &= ~EXTI_InitStruct->EXTI_Line;
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151 * @brief Fills each EXTI_InitStruct member with its reset value.
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152 * @param EXTI_InitStruct: pointer to a EXTI_InitTypeDef structure which will
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156 void EXTI_StructInit(EXTI_InitTypeDef* EXTI_InitStruct)
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158 EXTI_InitStruct->EXTI_Line = EXTI_LINENONE;
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159 EXTI_InitStruct->EXTI_Mode = EXTI_Mode_Interrupt;
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160 EXTI_InitStruct->EXTI_Trigger = EXTI_Trigger_Falling;
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161 EXTI_InitStruct->EXTI_LineCmd = DISABLE;
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165 * @brief Generates a Software interrupt.
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166 * @param EXTI_Line: specifies the EXTI lines to be enabled or disabled.
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167 * This parameter can be any combination of EXTI_Linex where x can be (0..22).
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170 void EXTI_GenerateSWInterrupt(uint32_t EXTI_Line)
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172 /* Check the parameters */
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173 assert_param(IS_EXTI_LINE(EXTI_Line));
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175 EXTI->SWIER |= EXTI_Line;
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179 * @brief Checks whether the specified EXTI line flag is set or not.
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180 * @param EXTI_Line: specifies the EXTI line flag to check.
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181 * This parameter can be:
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182 * @arg EXTI_Linex: External interrupt line x where x(0..22)
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183 * @retval The new state of EXTI_Line (SET or RESET).
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185 FlagStatus EXTI_GetFlagStatus(uint32_t EXTI_Line)
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187 FlagStatus bitstatus = RESET;
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188 /* Check the parameters */
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189 assert_param(IS_GET_EXTI_LINE(EXTI_Line));
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191 if ((EXTI->PR & EXTI_Line) != (uint32_t)RESET)
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203 * @brief Clears the EXTI
\92s line pending flags.
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204 * @param EXTI_Line: specifies the EXTI lines flags to clear.
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205 * This parameter can be any combination of EXTI_Linex where x can be (0..22).
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208 void EXTI_ClearFlag(uint32_t EXTI_Line)
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210 /* Check the parameters */
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211 assert_param(IS_EXTI_LINE(EXTI_Line));
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213 EXTI->PR = EXTI_Line;
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217 * @brief Checks whether the specified EXTI line is asserted or not.
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218 * @param EXTI_Line: specifies the EXTI line to check.
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219 * This parameter can be:
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220 * @arg EXTI_Linex: External interrupt line x where x(0..22)
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221 * @retval The new state of EXTI_Line (SET or RESET).
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223 ITStatus EXTI_GetITStatus(uint32_t EXTI_Line)
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225 ITStatus bitstatus = RESET;
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226 uint32_t enablestatus = 0;
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227 /* Check the parameters */
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228 assert_param(IS_GET_EXTI_LINE(EXTI_Line));
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230 enablestatus = EXTI->IMR & EXTI_Line;
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231 if (((EXTI->PR & EXTI_Line) != (uint32_t)RESET) && (enablestatus != (uint32_t)RESET))
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243 * @brief Clears the EXTI
\92s line pending bits.
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244 * @param EXTI_Line: specifies the EXTI lines to clear.
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245 * This parameter can be any combination of EXTI_Linex where x can be (0..22).
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248 void EXTI_ClearITPendingBit(uint32_t EXTI_Line)
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250 /* Check the parameters */
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251 assert_param(IS_EXTI_LINE(EXTI_Line));
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253 EXTI->PR = EXTI_Line;
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268 /******************* (C) COPYRIGHT 2010 STMicroelectronics *****END OF FILE****/
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