功能函数

#include "led.h"void led_set()
{// 使能rccRCC->MP_AHB4ENSETR |= (0x01 << 4);// 设置输出GPIOE->MODER &= (~(0x03 << 20));GPIOE->MODER |= (0x1 << 20);// 设置推挽输出GPIOE->OTYPER &= (~(0x01 << 10));// 无上拉下拉GPIOE->PUPDR &= (~(0x3 << 20));// 设置输出速率 低速GPIOE->OSPEEDR &= (~(0x3 << 20));GPIOE->ODR ^= (0x1 << 10);
}// 蜂鸣器
void SPI_set()
{RCC->MP_AHB4ENSETR |= (0x01 << 1);// 设置输出GPIOB->MODER &= (~(0x03 << 12));GPIOB->MODER |= (0x1 << 12);// 设置推挽输出GPIOB->OTYPER &= (~(0x01 << 6));// 无上拉下拉GPIOB->PUPDR &= (~(0x3 << 12));// 设置输出速率GPIOB->OSPEEDR |= (0x3 << 12);GPIOB->ODR ^= (0x1 << 6);
}// 风扇 PE9
void FAN_set()
{RCC->MP_AHB4ENSETR |= (0x01 << 4);// 设置输出GPIOE->MODER &= (~(0x03 << 18));GPIOE->MODER |= (0x1 << 18);// 设置推挽输出GPIOE->OTYPER &= (~(0x01 << 9));// 无上拉下拉GPIOE->PUPDR &= (~(0x3 << 18));// 设置输出速率GPIOE->OSPEEDR |= (0x3 << 18);GPIOE->ODR ^= (0x1 << 9);
}

中断处理函数

#include "key_it.h"
#include "led.h"extern void printf(const char *fmt, ...);
unsigned int i = 0;
void do_irq(void)
{int irqno; // 保存中断号irqno = GICC->IAR & 0x3FF;printf("%d\n", irqno);switch (irqno){case 97:/* key2 */printf("key2 INT\n");SPI_set();GICD->ICPENDR[3] |=(0x1<<1) ;EXTI->FPR1 |= (0x1 << 7);break;case 98:/* key3 */printf("key3 INT\n");FAN_set();GICD->ICPENDR[3] |=(0x1<<2) ;EXTI->FPR1 |= (0x1 << 8);break;case 99:/* key1  LED1 PE10亮*/printf("key1 INT\n");led_set();GICD->ICPENDR[3] |=(0x1<<3) ;EXTI->FPR1 |= (0x1 << 9);break;}// 清除中断GICC->EOIR = irqno;
}