Posted on July 25, 2015 at 02:19I used TIMER 2. It's interrupt time is 1us.
I made one long pulse and short pulse using GPIO output pin and TIMER 2.
but sometimes, interrupts occurred two times.
First figure is the result I want to get.
Second figure is the result I can get now.
At second figure the red circle is an error I think.
It's shivering in trigger mode.
Here is my code
void TIM2_IRQHandler(void)
{
//TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
assert_param(IS_TIM_ALL_PERIPH(TIM2));
TIM2->SR = (uint16_t)~0x0001;
//////Enable pin wait.(1us)
for(a=0;a<33;a++){
GPIOB->BSRRL = GPIO_Pin_0;
}
//wait(300ns)
for(a=0;a<10;a++){
GPIOB->BSRRH = GPIO_Pin_0;}
//one more short pulse(20ns)
GPIOB->BSRRL = GPIO_Pin_0;
GPIOB->BSRRH = GPIO_Pin_0;
}
