Posted on January 05, 2014 at 08:17I 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);
}
}
