1 #include "key1.h"
  2 //封装EXTI章节函数
  3 void hal_exti_init(int exti,unsigned int i)
  4 {
  5     switch(exti)
  6     {
  7     case 9:
  8         //使能GPIOF外设时钟
  9         RCC->MP_AHB4ENSETR |= (0x1<<5);
 10         //将PF9设置为输出模式
 11         GPIOF->MODER &= (~(0x3<<(exti*2)));
 12 
 13         //选择PF9产生EXTI9事件                                                                    
 14         EXTI->EXTICR3 &= (~(0xff<<(exti%4)*8));
 15         EXTI->EXTICR3 |= (i<<(exti%4)*8);
 16         //设置下降沿检测EXTI9事件
 17         EXTI->FTSR1 |= (0x1<<exti);
 18         //取消EXTI9事件中断屏蔽
 19         EXTI->C1IMR1 |= (0x1<<exti);
 20         break;
 21     case 7:
 22         //使能GPIOF外设时钟
 23         RCC->MP_AHB4ENSETR |= (0x1<<5);
 24         //将PF9设置为输出模式
 25         GPIOF->MODER &= (~(0x3<<(exti*2)));
 26 
 27         //选择PF9产生EXTI9事件                                                                    
 28         EXTI->EXTICR2 &= (~(0xff<<(exti%4)*8));
 29         EXTI->EXTICR2 |= (i<<(exti%4)*8);
 30         //设置下降沿检测EXTI9事件
 31         EXTI->FTSR1 |= (0x1<<exti);
 32         //取消EXTI9事件中断屏蔽
 33         EXTI->C1IMR1 |= (0x1<<exti);
 34         break;                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
 35     case 8:
 36         //使能GPIOF外设时钟
 37         RCC->MP_AHB4ENSETR |= (0x1<<5);
 38         //将PF9设置为输出模式
 39         GPIOF->MODER &= (~(0x3<<(exti*2)));
 40 
 41         //选择PF9产生EXTI9事件                                                                    
 42         EXTI->EXTICR3 &= (~(0xff<<(exti%4)*8));
 43         EXTI->EXTICR3 |= (i<<(exti%4)*8);
 44         //设置下降沿检测EXTI9事件
 45         EXTI->FTSR1 |= (0x1<<exti);
 46         //取消EXTI9事件中断屏蔽
 47         EXTI->C1IMR1 |= (0x1<<exti);
 48         break;
 49     }
 50 }
 51 
 52 //封装GIC章节函数
 53 void hal_gic_init(int uart_num,unsigned int i)
 54 {
 55     //使能99号中断
 56     GICD->ISENABLER[uart_num/32] |= (0x1<<(uart_num%32));
 57     //设置99号中断优先级
 58     GICD->IPRIORITYR[uart_num/4] &= (~(i<<(uart_num%4*8+3)));
 59     //设置99号的中断目标处理器
 60     GICD->ITARGETSR[uart_num/4] &= (~(0x3<<(uart_num%4*8)));
 61     GICD->ITARGETSR[uart_num/4] |= (0x1<<(uart_num%4*8));
 62 
 63     //全局使能组0中断被转发到GICC层
 64     GICD->CTRL |= 0x1;
 65     //设置中断的优先级掩码
 66     GICC->PMR |= (0x1f<<3);
 67     //全局使能组0中断被转发到处理器
 68     GICC->CTRL |= 0x1;
 69 }
~