如果不启用SYSCFG时钟，理论上不是应该无法正常中断么?
但是，在使用GPIOA_Pin_0时，竟然进中断了，为什么？

代码如下，引脚跟战舰探索者不一样，各位可以改下试试。。。求教下原因，求深入解释； [mw_shl_code=c,true]#include "stm32f4xx.h" uint32_t inc_ms = 0; uint8_t light_on = 0; void SysTickDelayms(uint32_t ms) { inc_ms = 0; SysTick->CTRL |= 0x01; while(inc_ms < ms); SysTick->CTRL &= ~(uint32_t)0x1; } void GPIOD_Init(void) { // 1.配置时钟 RCC->AHB1ENR |= (uint32_t)0x01 << 3; // 启用GPIOD的时钟 // 2.配置模式 GPIOD->MODER |= (uint32_t)0x01 << (12 * 2); // 设置GPIOD12的模式为输出 GPIOD->MODER |= (uint32_t)0x01 << (13 * 2); GPIOD->MODER |= (uint32_t)0x01 << (14 * 2); GPIOD->MODER |= (uint32_t)0x01 << (15 * 2); // 3.配置输出模式 GPIOD->OTYPER &= ~((uint32_t)0x0 << 12); // 0 推挽输出 GPIOD->OTYPER &= ~((uint32_t)0x0 << 13); GPIOD->OTYPER &= ~((uint32_t)0x0 << 14); GPIOD->OTYPER &= ~((uint32_t)0x0 << 15); // 4.配置上下拉 GPIOD->UPDR |= (uint32_t)0x01 << (12 * 2); // 01 上拉 GPIOD->UPDR |= (uint32_t)0x01 << (13 * 2); GPIOD->UPDR |= (uint32_t)0x01 << (14 * 2); GPIOD->UPDR |= (uint32_t)0x01 << (15 * 2); // 5.配置速度 GPIOD->OSPEEDR |= (uint32_t)0x01 << (12 * 2); // 01 25MHz GPIOD->OSPEEDR |= (uint32_t)0x01 << (13 * 2); GPIOD->OSPEEDR |= (uint32_t)0x01 << (14 * 2); GPIOD->OSPEEDR |= (uint32_t)0x01 << (15 * 2); // 6.锁定模式（可选，锁定之后引脚模式便不可以更改） // 略 // 7.配置完成，给定初始输出 GPIOD->BSRRL = (uint16_t)((uint16_t)0x1 << 12); // 置位寄存给定，关闭灯 GPIOD->BSRRH = (uint16_t)((uint16_t)0x1 << 13); // 复位寄存给定，打开灯 GPIOD->BSRRL = (uint16_t)((uint16_t)0x1 << 14); GPIOD->BSRRH = (uint16_t)((uint16_t)0x1 << 15); } void RCC_SetSYSCLK_HSE() { __IO uint32_t cfgr = 0; cfgr = RCC->CFGR; cfgr &= ~(uint32_t)0x03; cfgr |= (uint32_t)0x1; // SET HSE AS SYSTEM CLOCK RCC->CFGR = cfgr; } void SysTick_Init() { SysTick->LOAD = 1000 * 8 / 8; // HSE 8 MHz, FCLK = SYSCLK / 8 SysTick->CTRL &= ~((uint32_t)0x1 << 2); // CLKSOURCE, =1--FCLK, =0--STCLK(ARM未规定，STM32定义为AHB) SysTick->CTRL |= ((uint32_t)0x1 << 1); // 启用中断方式 } void EXTI0_Init() { RCC->AHB1ENR |= (uint32_t)0x01; // GPIOA NVIC_EnableIRQ(EXTI0_IRQn); // 库函数配置 // RCC->APB2ENR |= (uint32_t)0x1 << 14; // 启用SYSCFG，不启用也能中断？ EXTI->IMR |= (uint32_t)0x1; EXTI->FTSR |= (uint32_t)0x1; // EXTI->RTSR |= (uint32_t)0x1; SYSCFG->EXTICR[0] &= ~(uint32_t)0xF; } void main() { uint32_t delayms = 500; RCC_SetSYSCLK_HSE(); SysTick_Init(); GPIOD_Init(); EXTI0_Init(); while(1) { while(light_on) { GPIOD->ODR ^= (uint16_t)0xF << 12; SysTickDelayms(delayms); //软中断测试 //EXTI->SWIER |= 0x1; } } } void SysTick_Handler(void) { inc_ms++; return; } void EXTI0_IRQHandler(void) { EXTI->R |= (uint32_t)0x1; light_on = !light_on; return; } [/mw_shl_code]