Posted on February 23, 2017 at 02:08Hi
I am using 20 pin STM8s003f3 controller. I have programmed TIM2 channel 3(pin 10) in Input capture mode with capture to be made on falling edge detection on channel 3. I have enabled TIM2 capture/compare interrupt. I have also configured the option byte.
I am facing problem related to interrupt, there is no pulses or signals at channel input but still execution goes into the interrupt repeatedly. I am not getting what is problem. Please see below TIM2 initialization and interrupt code.
//TIM2 Initialization
TIM2->PSCR = 0x04; //Deviding incoming clock by 16 Fck_cnt = Fck_psc/(2^PSC[3:0]);
TIM2->CCMR3 |= 0x01; //CONFIGURING CHANNEL IN INPUT CAPTURE MODE
TIM2->CCMR3 |= 0x10; //INPUT SAMPLING UPTO TWO CLOCK CYCLES
TIM2->CCER2 |= 0x02; //SELECTING FALLING EDGE AS TRIGER SIGNAL
TIM2->CCER2 |= 0x01; //ENABLED CAPTURE INPUT
TIM2->IER |= 0x08; //CAPTURE/COMPARE INTERRUPT IS ENABLED
TIM2->CR1 |0x01; //TIM2 ENABLED
INTERRUPT_HANDLER(TIM2_CAP_COM_IRQHandler, 14)
{
GPIOD->ODR ^=0x10; //Toggling PD4
TIM2->SR1 &= 0xf7; //clearing Capture flag
}
I am using STVD for program development. Thanks in advance.
