stm32f2芯片配置EXTI报错，求解惑

泯锋 · 发表于 2019-11-8 09:38:17

我仿照芯片固件库手册的EXTI配置例程进行配置，把PA2配置成外部中断引脚，但是一运行就报错，报错内容后面附图，代码也贴在后面。我按报错内容查了下，发现是GPIO配置的GPIO_PuPd参数有错误，但是这个参数我上拉下拉浮空都试过了，都是报这个错误；
另外我看硬件电路图PA2没有接上下拉电阻，不知道是不是这个原因造成的？

再就是我把配置EXTI的那段代码注释掉后就不报错了

配置代码如下：
void Interrupt_config(void)
{
EXTI_InitTypeDef EXTI_InitStruct;
GPIO_InitTypeDef GPIO_InitStruct;
NVIC_InitTypeDef NVIC_InitStruct;

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG,ENABLE);/* Enable SYSCFG's APB interface clock */

/* Configure PA2 pin in input mode */
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;///
GPIO_Init(GPIOA,&GPIO_InitStruct);

SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA,EXTI_PinSource2);/* Connect EXTI Line2 to PA2 pin */

/* Configure EXTI line2 */
EXTI_InitStruct.EXTI_Line = EXTI_Line2;
EXTI_InitStruct.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStruct.EXTI_Trigger = EXTI_Trigger_Falling;///
EXTI_InitStruct.EXTI_LineCmd = ENABLE;
EXTI_ClearITPendingBit(EXTI_Line2);
EXTI_Init(&EXTI_InitStruct);

//NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
NVIC_InitStruct.NVIC_IRQChannel = EXTI2_IRQn;
NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0x0F;///
NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0x0F;///
NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStruct);
}

void EXTI2_IRQHandler(void)
{
u8 bufCard[4];
u32 uCardId;
if(EXTI_GetITStatus(EXTI_Line2) != RESET)
{
ComReqA_UID(bufCard);
uCardId = (bufCard[0] << 24) | (bufCard[1] << 16) | (bufCard[2] << 8) | bufCard[3];
rt_kprintf("cardnum:%X\n",uCardId);
rt_thread_sleep(1);
}
/* Clear the EXTI line 0 pending bit */
EXTI_ClearITPendingBit(EXTI_Line2);
}