Question
Problem with external interrupts
Posted on January 05, 2014 at 08:17
I am trying to attach interrupt to my motor encoder ( connected to pin PB9). My idea is to get the pulse count as the motor rotates. Shown below is a snippet of my code to attach interrupt to pin PB9. I should be getting the pulse count but I don't. Any help would be appreciated. Thanks.
. void (*exti9_handler)();pulseCount(){ count++;}attachInterrupt(pulseCount, CHANGE); // set pin for encoder pin void attachInterrupt(void (*ISR)(void), int mode) { EXTI_InitTypeDef EXTI_InitStructure; NVIC_InitTypeDef NVIC_InitStructure; SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOB, EXTI_PinSource9); EXTI_StructInit(&EXTI_InitStructure); EXTI_InitStructure.EXTI_Line = EXTI_Line9; EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; EXTI_InitStructure.EXTI_Trigger =EXTI_Trigger_Rising_Falling; EXTI_InitStructure.EXTI_LineCmd = ENABLE; EXTI_Init(&EXTI_InitStructure); NVIC_InitStructure.NVIC_IRQChannel = EXTI4_15_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x01; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x01; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); exti9_handler=ISR;}void EXTI4_15_IRQHandler(){ if(EXTI_GetITStatus(EXTI_Line9) != RESET) { if (exti9_handler != NULL) { exti9_handler(); } EXTI_ClearITPendingBit(EXTI_Line9); }}