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STM32F0xx Standard Peripherals Firmware Library
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STM32F0xx_StdPeriph_Examples/EXTI/EXTI_Example/main.c
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00001 /** 00002 ****************************************************************************** 00003 * @file EXTI/EXTI_Example/main.c 00004 * @author MCD Application Team 00005 * @version V1.4.0 00006 * @date 24-July-2014 00007 * @brief Main program body 00008 ****************************************************************************** 00009 * @attention 00010 * 00011 * <h2><center>© COPYRIGHT 2014 STMicroelectronics</center></h2> 00012 * 00013 * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License"); 00014 * You may not use this file except in compliance with the License. 00015 * You may obtain a copy of the License at: 00016 * 00017 * http://www.st.com/software_license_agreement_liberty_v2 00018 * 00019 * Unless required by applicable law or agreed to in writing, software 00020 * distributed under the License is distributed on an "AS IS" BASIS, 00021 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 00022 * See the License for the specific language governing permissions and 00023 * limitations under the License. 00024 * 00025 ****************************************************************************** 00026 */ 00027 00028 /* Includes ------------------------------------------------------------------*/ 00029 #include "main.h" 00030 00031 /** @addtogroup STM32F0xx_StdPeriph_Examples 00032 * @{ 00033 */ 00034 00035 /** @addtogroup EXTI_Example 00036 * @{ 00037 */ 00038 00039 /* Private typedef -----------------------------------------------------------*/ 00040 /* Private define ------------------------------------------------------------*/ 00041 /* Private macro -------------------------------------------------------------*/ 00042 /* Private variables ---------------------------------------------------------*/ 00043 EXTI_InitTypeDef EXTI_InitStructure; 00044 GPIO_InitTypeDef GPIO_InitStructure; 00045 NVIC_InitTypeDef NVIC_InitStructure; 00046 00047 /* Private function prototypes -----------------------------------------------*/ 00048 static void EXTI0_Config(void); 00049 #ifdef USE_STM32072B_EVAL 00050 static void EXTI2_3_Config(void); 00051 #endif 00052 static void EXTI4_15_Config(void); 00053 00054 /* Private functions ---------------------------------------------------------*/ 00055 00056 /** 00057 * @brief Main program. 00058 * @param None 00059 * @retval None 00060 */ 00061 int main(void) 00062 { 00063 /*!< At this stage the microcontroller clock setting is already configured, 00064 this is done through SystemInit() function which is called from startup 00065 file (startup_stm32f0xx.s) before to branch to application main. 00066 To reconfigure the default setting of SystemInit() function, refer to 00067 system_stm32f0xx.c file 00068 */ 00069 00070 /* Initialize LEDs mounted on EVAL board */ 00071 STM_EVAL_LEDInit(LED1); 00072 STM_EVAL_LEDInit(LED2); 00073 STM_EVAL_LEDInit(LED3); 00074 STM_EVAL_LEDInit(LED4); 00075 00076 /* Configure PA0 in interrupt mode */ 00077 EXTI0_Config(); 00078 00079 /* Configure PE3, PE2 in interrupt mode only for STM32072B devices*/ 00080 #ifdef USE_STM32072B_EVAL 00081 EXTI2_3_Config(); 00082 #endif 00083 00084 /* Configure PC13 in interrupt mode */ 00085 EXTI4_15_Config(); 00086 00087 /* Generate software interrupt: simulate a falling edge applied on EXTI8 line */ 00088 EXTI_GenerateSWInterrupt(EXTI_Line8); 00089 00090 /* Infinite loop */ 00091 while (1) 00092 { 00093 } 00094 } 00095 00096 /** 00097 * @brief Configure PA0 in interrupt mode 00098 * @param None 00099 * @retval None 00100 */ 00101 static void EXTI0_Config(void) 00102 { 00103 /* Enable GPIOA clock */ 00104 RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE); 00105 00106 /* Configure PA0 pin as input floating */ 00107 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; 00108 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN; 00109 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN; 00110 GPIO_Init(GPIOA, &GPIO_InitStructure); 00111 00112 /* Enable SYSCFG clock */ 00113 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE); 00114 /* Connect EXTI0 Line to PA0 pin */ 00115 SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource0); 00116 00117 /* Configure EXTI0 line */ 00118 EXTI_InitStructure.EXTI_Line = EXTI_Line0; 00119 EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; 00120 EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising; 00121 EXTI_InitStructure.EXTI_LineCmd = ENABLE; 00122 EXTI_Init(&EXTI_InitStructure); 00123 00124 /* Enable and set EXTI0 Interrupt */ 00125 NVIC_InitStructure.NVIC_IRQChannel = EXTI0_1_IRQn; 00126 NVIC_InitStructure.NVIC_IRQChannelPriority = 0x00; 00127 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; 00128 NVIC_Init(&NVIC_InitStructure); 00129 } 00130 00131 /** 00132 * @brief Configure PE3, PE0in interrupt mode 00133 * @param None 00134 * @retval None 00135 */ 00136 #ifdef USE_STM32072B_EVAL 00137 static void EXTI2_3_Config(void) 00138 { 00139 /* Enable GPIOE clock */ 00140 RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOE, ENABLE); 00141 00142 /* Configure PE3 and PE2 pins as input floating */ 00143 00144 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2|GPIO_Pin_3; 00145 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN; 00146 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_DOWN; 00147 GPIO_Init(GPIOE, &GPIO_InitStructure); 00148 00149 /* Enable SYSCFG clock */ 00150 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE); 00151 00152 /* Connect EXTI3 Line to PE3 pin */ 00153 SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOE, EXTI_PinSource3); 00154 00155 /* Connect EXTI2 Line to PE2 pin */ 00156 SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOE, EXTI_PinSource2); 00157 00158 /* Configure EXTI3 line */ 00159 EXTI_InitStructure.EXTI_Line = EXTI_Line3; 00160 EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; 00161 EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising; 00162 EXTI_InitStructure.EXTI_LineCmd = ENABLE; 00163 EXTI_Init(&EXTI_InitStructure); 00164 00165 /* Configure EXTI2 line */ 00166 EXTI_InitStructure.EXTI_Line = EXTI_Line2; 00167 EXTI_Init(&EXTI_InitStructure); 00168 00169 /* Enable and set EXTI2_3 Interrupt */ 00170 NVIC_InitStructure.NVIC_IRQChannel = EXTI2_3_IRQn; 00171 NVIC_InitStructure.NVIC_IRQChannelPriority = 0x00; 00172 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; 00173 NVIC_Init(&NVIC_InitStructure); 00174 00175 } 00176 #endif 00177 00178 /** 00179 * @brief Configure PC13 in interrupt mode 00180 * @param None 00181 * @retval None 00182 */ 00183 static void EXTI4_15_Config(void) 00184 { 00185 /* Enable GPIOC clock */ 00186 RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC, ENABLE); 00187 00188 /* Enable SYSCFG clock */ 00189 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE); 00190 00191 #ifdef USE_STM320518_EVAL 00192 /* Configure PC9 pin as input floating */ 00193 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; 00194 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN; 00195 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; 00196 GPIO_Init(GPIOC, &GPIO_InitStructure); 00197 00198 /* Connect EXTI9 Line to PC9 pin */ 00199 SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOC, EXTI_PinSource9); 00200 00201 /* Configure EXTI9 line */ 00202 EXTI_InitStructure.EXTI_Line = EXTI_Line9; 00203 EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; 00204 EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; 00205 EXTI_InitStructure.EXTI_LineCmd = ENABLE; 00206 EXTI_Init(&EXTI_InitStructure); 00207 00208 #endif 00209 00210 /* Configure PC8 and PC13 pins as input floating */ 00211 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8|GPIO_Pin_13; 00212 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN; 00213 GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; 00214 GPIO_Init(GPIOC, &GPIO_InitStructure); 00215 00216 /* Connect EXTI8 Line to PC8 pin */ 00217 SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOC, EXTI_PinSource8); 00218 00219 /* Connect EXTI13 Line to PC13 pin */ 00220 SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOC, EXTI_PinSource13); 00221 00222 /* Configure EXTI8 line */ 00223 EXTI_InitStructure.EXTI_Line = EXTI_Line8; 00224 EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; 00225 EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; 00226 EXTI_InitStructure.EXTI_LineCmd = ENABLE; 00227 EXTI_Init(&EXTI_InitStructure); 00228 00229 /* Configure EXTI13 line */ 00230 EXTI_InitStructure.EXTI_Line = EXTI_Line13; 00231 EXTI_Init(&EXTI_InitStructure); 00232 00233 /* Enable and set EXTI4_15 Interrupt */ 00234 NVIC_InitStructure.NVIC_IRQChannel = EXTI4_15_IRQn; 00235 NVIC_InitStructure.NVIC_IRQChannelPriority = 0x00; 00236 NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; 00237 NVIC_Init(&NVIC_InitStructure); 00238 00239 } 00240 #ifdef USE_FULL_ASSERT 00241 00242 /** 00243 * @brief Reports the name of the source file and the source line number 00244 * where the assert_param error has occurred. 00245 * @param file: pointer to the source file name 00246 * @param line: assert_param error line source number 00247 * @retval None 00248 */ 00249 void assert_failed(uint8_t* file, uint32_t line) 00250 { 00251 /* User can add his own implementation to report the file name and line number, 00252 ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */ 00253 00254 /* Infinite loop */ 00255 while (1) 00256 { 00257 } 00258 } 00259 #endif 00260 00261 /** 00262 * @} 00263 */ 00264 00265 /** 00266 * @} 00267 */ 00268 00269 /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/