ARM-day9

按键控制小灯、蜂鸣器、风扇，按一次启动，第二次关闭

key_it.c

#include "key_it.h"//按键3的配置
void key3_it_config()
{//RCC使能GPIOF时钟RCC->MP_AHB4ENSETR |= (0x1<<5);GPIOF->MODER &= (~(0x3<<16));EXTI->EXTICR3 &= (~(0xFF<<0));EXTI->EXTICR3 |= (0x5<<0);EXTI->FTSR1 |= (0x1<<8);EXTI->C1IMR1 |= (0x1<<8);GICD->ISENABLER[3] |= (0x1<<2);GICD->IPRIORITYR[24] &= (~(0x1F<<19));GICD->ITARGETSR[24] &= (~(0x3<<16));GICD->ITARGETSR[24] |= (0x1<<16);
}void key_it_config()
{//RCC使能GPIOF时钟RCC->MP_APB1ENSETR |= (0x1<<5);//设置PF9 PF7 Pf8 的GPIO输入//PF9GPIOF->MODER &= (~(0x3<<18));//PF8GPIOF->MODER &= (~(0x3<<16));//PF7GPIOF->MODER &= (~(0x3<<14));//设置PF9 PF7 PF8 产生EXTI事件 	EXTI_EXTICRx//PF7EXTI->EXTICR2 &= (~(0xFF<<24));EXTI->EXTICR2 |= (0x5<<24);//PF8EXTI->EXTICR3 &= (~(0xFF)<<0);EXTI->EXTICR3 |= (0x5<<0);//PF9EXTI->EXTICR3 &= (~(0xFF)<<8);EXTI->EXTICR3 |= (0x5<<8);//设置事件触发方式为下降沿触发 	EXTI_FTSR1//PF7EXTI->FTSR1 |= (0x1<<7);//PF8EXTI->FTSR1 |= (0x1<<8);//PF9EXTI->FTSR1 |= (0x1<<9);//设置EXTI事件触发不屏蔽 	EXTI_IMR1//PF7EXTI->C1IMR1 |= (0x1<<7);//PF8EXTI->C1IMR1 |= (0x1<<8);//PF9EXTI->C1IMR1 |= (0x1<<9);//使能中断能转发到特定的CPU接口层 	GICD_ISENABLERx//PF7 97号中断GICD->ISENABLER[3] |= (0x1<<1);//PF8 98号中断GICD->ISENABLER[3] |= (0x1<<2);//PF9 99号中断GICD->ISENABLER[3] |= (0x1<<3);//设置中断优先级 	GICD_ISENABLERx//PF7GICD->IPRIORITYR[24] &= (~(0x1F<<11));//PF8GICD->IPRIORITYR[24] &= (~(0x1F<<19));//PF9GICD->IPRIORITYR[24] &= (~(0x1F<<27));//设置当前中断被转发到哪一个CPU处理//PF7 97中断GICD->ITARGETSR[24] &= (~(0x3<<8));GICD->ITARGETSR[24] |= (0x1<<8);//PF8 98中断GICD->ITARGETSR[24] &= (~(0x3<<16));GICD->ITARGETSR[24] |= (0x1<<16);//PF9 99中断GICD->ITARGETSR[24] &= (~(0x3<<24));GICD->ITARGETSR[24] |= (0x1<<24);//使能组0转发中断 	GICD_CTRLGICD->CTRL |= 0x1;//设置中断优先级掩码 	GICC_PMRGICC->PMR |= (0x1F<<3);//使能CPU可以处理组0转发的中断GICC_CTRLGICC->CTRL |= 0x1;
}

led.c

#include "led.h"//延时函数
void delay(int ms)
{int i,j;for(i=0; i<ms; i++){for(j=0; j<2000; j++);}
}//GPIO初始化
void all_led_init()
{//RCC使能RCC |= (0x3<<4);//设置PE10 PF10 PE8为输出模式GPIOE.moder &= (~(0x3<<20));GPIOE.moder |= (0x1<<20);GPIOF.moder &= (~(0x3<<20));GPIOF.moder |= (0x1<<20);GPIOE.moder &= (~(0x3<<16));GPIOE.moder |= (0x1<<16);//设置推挽输出GPIOE.otyper &= (~(0x1<<10));GPIOF.otyper &= (~(0x1<<10));GPIOE.otyper &= (~(0x1<<8));//设置三个管脚低速输出GPIOE.ospeedr &= (~(0x3<<20));GPIOF.ospeedr &= (~(0x3<<20));GPIOE.ospeedr &= (~(0x3<<16));//设置三个管脚输出时无上拉电阻和下拉电阻GPIOE.pupdr &= (~(0x3<<20));GPIOF.pupdr &= (~(0x3<<20));GPIOE.pupdr &= (~(0x3<<16));
}

feng2.c

#include "feng2.h"void buzzer_init()
{//RCC使能GPIOB时钟RCC->MP_AHB4ENSETR |= (0x1<<1);//PB6GPIOB->MODER &= (~(0x3<<12));GPIOB->MODER |= (0x1<<12);GPIOB->OTYPER &= (~(0x1<<6));GPIOB->OSPEEDR &= (~(0x3<<12));GPIOB->PUPDR &= (~(0x3<<12));
}void fan_init()
{GPIOE->MODER &= (~(0x3<<18));//PE9GPIOE->MODER |= (0x1<<18);GPIOE->OTYPER &= (~(0x1<<9));GPIOE->OSPEEDR &= (~(0x3<<18));GPIOE->PUPDR &= (~(0x3<<18));}

do_irq.c

#include "key_it.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;switch(irqno){case 99: 	//key1//按键1中断处理printf("KEY1 INT\n");if(GPIOE->ODR & (0x1<<10)){GPIOE->ODR &= (~(0x1<<10));}else{GPIOE->ODR |= (0x1<<10);}//清除挂起中断标志位 GICD_ICPENDRxGICD->ICPENDR[3] |= (0x1 << 3);//清除中断触发标志位 EXTI_FPR1EXTI->FPR1 |= (0x1 << 9);break;case 97: 	//key2//按键2中断处理printf("KEY2 INT\n");if(GPIOB->ODR & (0x1<<6)){GPIOB->ODR &= (~(0x1<<6));}else{GPIOB->ODR |= (0x1<<6);}//清除挂起中断标志位 GICD_ICPENDRxGICD->ICPENDR[3] |= (0x1 << 1);//清除中断触发标志位 EXTI_FPR1EXTI->FPR1 |= (0x1 << 7);break;case 98: 	//key3//按键3中断处理printf("KEY3 INT\n");if(GPIOE->ODR & (0x1<<9)){GPIOE->ODR &= (~(0x1<<9));}else{GPIOE->ODR |= (0x1<<9);}//清除挂起中断标志位 GICD_ICPENDRxGICD->ICPENDR[3] |= (0x1 << 2);//清除中断触发标志位 EXTI_FPR1EXTI->FPR1 |= (0x1 << 8);break;default:break;}//清除处理完的中断号 GICC_EOIRGICC->EOIR = irqno;
}

main.c

#include "uart.h"int main()
{//	char c;
//	char *s;//串口初始化uart4_init();//中断初始化all_led_init();	buzzer_init();fan_init();key_it_config();key3_it_config();while(1){//保证主程序不结束}return 0;
}