Posted on January 10, 2013 at 22:59
I would like to be interrupted every time
an external input
occurs
-
line is take
n high on each
data tran
sfer to another chip
.
I can see the external input on the scope
but I don't get a
n interrupt. Am I not setup correctly?
I'm using a STM32F4.
void
TriggerConfig(
void
)
{
/* PA.02 (INPUT) */
/* Enable System Clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
/* Enable HW Peripheral Clock */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
/* GPIO configuration : PA.02 */
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Connect GPIO to EXT */
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource2);
/* External Trigger */
EXTI_InitTypeDef EXTI_InitStructure;
EXTI_InitStructure.EXTI_Line = EXTI_Line2;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
/* Enable the global Interrupt */
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = EXTI2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
void
EXTI2_IRQHandler(
void
)
{
if
(EXTI_GetITStatus(EXTI_Line2) != RESET)
{
printf
(
''Gottcha!''
);
}
/* Clear the interrupt */
EXTI_ClearITPendingBit(EXTI_Line2);
NVIC_ClearPendingIRQ(EXTI2_IRQn);
}
