Posted on November 24, 2014 at 21:35Code is very simple. I have checked it again and again but cannot get the interrupt to trigger. The interrupt does trigger if I use the software interrupt command. Anybody see the bug? I am outputting a 150Hz 3.3V square wave into the port. No grounding issues. I have verified on a scope.
void EXTI0_Config(void)
{
EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
/* Enable GPIOA clock */
RCC_APB2PeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
/* Configure PA.00 pin as input floating */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Enable AFIO clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource11);
/* Configure EXTI0 line */
EXTI_InitStructure.EXTI_Line = EXTI_Line0;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising; // or Falling if button shorts to ground
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
/* Enable and set EXTI0 Interrupt to the lowest priority */
NVIC_InitStructure.NVIC_IRQChannel = EXTI0_1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPriority = 0x00;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
void EXTI0_1_IRQHandler(void)
{
if(EXTI_GetITStatus(EXTI_Line0) != RESET)
{
count1++;
opt_angle = 3600*(count1 + count2)/1024;
/* Clear the EXTI line 0 pending bit */
EXTI_ClearITPendingBit(EXTI_Line0);
}
if(EXTI_GetITStatus(EXTI_Line1) != RESET)
{
count2++;
opt_angle = 3600*(count1 + count2)/1024;
if(opt_angle >= 3600){
count1 = 0;
count2 = 0;
opt_angle = 0;
}
/* Clear the EXTI line 0 pending bit */
EXTI_ClearITPendingBit(EXTI_Line1);
}
}
