ARM实验5 —— 按键中断实验

key_int按键中断实验

实验内容:

通过开发板上的按键中断控制led灯进行跑马灯并打印信息。

通过简单事例说明猎户座4412处理器的GIC中断处理的应用,设置key2按键连接的引脚为中断模式,当识别按键被按下时进入相应的中断处理函数

实验目的:

熟悉开发环境的使用

掌握猎户座4412处理器的中断过程及编程。

实验平台:

fs4412开发板,eclipse,secureCRT。

实验步骤:

对外设进行使能:

1.查看key2在开发板的位置:

2.查看UART_RING在核心板的位置:

3.查看GPX1在芯片手册的位置:

4.查看GPX1的中断源:

 5.设置TXT_INT41[1]为下降沿触发。

6.使能TXT_INT41[1]

实验代码

  1 #include "exynos_4412.h"
  2 typedef enum
  3 {
  4     false,
  5     true
  6 }bool;
  7 void do_irq()
  8 {
  9     // 获取中断号
 10     unsigned int irq_num = CPU0.ICCIAR & 0x3ff;
 11     switch(irq_num)
 12     {
 13     case 57:
 14         printf("This interrupt id is %d\n", irq_num);
 15 
 16 
 17 
 18                 led_isOn(true);
 19                 mydelay_ms(1000);
 20                 led_isOn(false);
 21                 //mydelay_ms(1000);
 22 
 23 
 24 
 25         EXT_INT41_PEND = 0x1 << 1;    // 清pend(置1清0)
 26         ICDICPR.ICDICPR1 = 0x1 << 25;    // 清中断使能位
 27         break;
 28     case 58:
 29         printf("58This interrupt id is %d\n", irq_num);
 30         break;
 31     default:
 32         printf("Interrupt is not exist!\n");
 33         break;
 34     }
 35 
 36     // 把处理器中处理完的中断号返回给gic
 37     // 告诉gic该中断处理结束,可以送入下一个pending进入
 38     CPU0.ICCEOIR = (CPU0.ICCEOIR & ~(0x3ff)) | irq_num;
 39 }
 40 
 41 void peripheral_init()
 42 {
 43     GPX1.CON = 0xf << 4;        // 配置GPIO为外部中断
 44     EXT_INT41_CON = 0x2 << 4;    // 下降沿触发中断
 45     EXT_INT41_MASK = 0x0;        // 使能相应外设
 46 }
 47 
 48 void gic_init()
 49 {
 50     ICDDCR = 0x1;                        // 使能中断到分配器
 51     ICDISER.ICDISER1 = 0x1 << 25;        // 使能按键中断号
 52     CPU0.ICCICR = 0x1;                 // 把中断从cpu接口送入处理器
 53     // 屏蔽中断优先级,255表示所有中断都允许通过
 54     CPU0.ICCPMR = 0xff;
 55     ICDIPTR.ICDIPTR14 = 0x1 << 8; // 选择cpu接口
 56 }
 57 
 58 void mydelay_ms(int ms)
 59 {
 60     int i, j;
 61     while(ms--)
 62     {
 63         for (i = 0; i < 5; i++)
 64             for (j = 0; j < 500; j++);
 65     }
 66 }
 67 
 68 void len_init(){
 69         GPX1.CON = (GPX1.CON&  (~0xf)) | 0x1;
 70         GPF3.CON = GPF3.CON | (0x1<<16);
 71         GPF3.CON = GPF3.CON | (0x1<<20);
 72         GPX2.CON = GPX2.CON & (~(0xf<<28)) | (0x1<<28);
 73 }
 74 void led_isOn(bool bFlag)
 75 {
 76     if(bFlag == false)
 77         GPX2.DAT &= ~(0x1<<7);        // led is off
 78     else
 79         GPX2.DAT |= 0x1<<7;       // LED is on
 80 
 81     mydelay_ms(1000);
 82 
 83     if(bFlag == false)
 84         GPX1.DAT &= ~0x1;        // led is off
 85     else
 86         GPX1.DAT |= 0x1;       // LED is on
 87 
 88     mydelay_ms(1000);
 89     if(bFlag == false)
 90             GPF3.DAT &= ~(0x1<<4);        // led is off
 91         else
 92             GPF3.DAT |= 0x1<<4;       // LED is on
 93     mydelay_ms(1000);
 94 
 95     if(bFlag == false)
 96                 GPF3.DAT &= ~(0x1<<5);        // led is off
 97             else
 98                 GPF3.DAT |= 0x1<<5;       // LED is on
 99 
100 }
101 int main()
102 {
103     peripheral_init();
104     gic_init();
105 
106     len_init();
107 
108 
109     int i = 0;
110     while(1)
111     {
112         printf("i = %d\n", i++);
113         mydelay_ms(800);
114     }
115 
116     return 0;
117 }

实验结果;

 

 

 

拓展:根据key2 的代码写一个key3 的代码。

查看k3在开发板的位置:

查看SIM_DET 在核心板的位置;

 

查看GPX1_2在芯片手册的位置;

中断源:

代码:

  1 /*
  2  * main.c
  3  *
  4  *  Created on: 2018-9-24
  5  *      Author: Administrator
  6  */
  7 
  8 #include"exynos_4412.h"
  9 typedef enum
 10 {
 11     false,
 12     true
 13 }bool;
 14 
 15 void do_irq()
 16 {
 17     // 获取中断号
 18     unsigned int irq_num = CPU0.ICCIAR & 0x3ff;
 19     switch(irq_num)
 20     {
 21 
 22     case 58:
 23         printf("58This interrupt id is %d\n", irq_num);
 24         led_isOn(true);
 25         mydelay_ms(1000);
 26         led_isOn(false);
 27         //mydelay_ms(1000);
 28 
 29         EXT_INT41_PEND = 0x1 << 2;    // 清pend(置1清0)
 30         ICDICPR.ICDICPR1 = 0x1 << 26;    // 清中断使能位
 31 
 32         break;
 33     default:
 34         printf("Interrupt is not exist!\n");
 35         break;
 36     }
 37 
 38     // 把处理器中处理完的中断号返回给gic
 39     // 告诉gic该中断处理结束,可以送入下一个pending进入
 40     CPU0.ICCEOIR = (CPU0.ICCEOIR & ~(0x3ff)) | irq_num;
 41 }
 42 
 43 
 44 void peripheral_init()
 45 {
 46     GPX1.CON = 0xf << 8;        // 配置GPIO为外部中断
 47     EXT_INT41_CON = 0x2 << 8;    // 下降沿触发中断
 48     EXT_INT41_MASK = 0x0;        // 使能相应外设
 49 }
 50 
 51 void gic_init()
 52 {
 53     ICDDCR = 0x1;                        // 使能中断到分配器
 54     ICDISER.ICDISER1 = 0x1 << 26;        // 使能按键中断号
 55     CPU0.ICCICR = 0x1;                 // 把中断从cpu接口送入处理器
 56     // 屏蔽中断优先级,255表示所有中断都允许通过
 57     CPU0.ICCPMR = 0xff;
 58     ICDIPTR.ICDIPTR14 = 0x1 << 16; // 选择cpu接口
 59 }
 60 
 61 void len_init(){
 62         GPX1.CON = (GPX1.CON&  (~0xf)) | 0x1;
 63         GPF3.CON = GPF3.CON | (0x1<<16);
 64         GPF3.CON = GPF3.CON | (0x1<<20);
 65         GPX2.CON = GPX2.CON & (~(0xf<<28)) | (0x1<<28);
 66 }
 67 void led_isOn(bool bFlag)
 68 {
 69     if(bFlag == false)
 70         GPX2.DAT &= ~(0x1<<7);        // led is off
 71     else
 72         GPX2.DAT |= 0x1<<7;       // LED is on
 73 
 74     mydelay_ms(1000);
 75 
 76     if(bFlag == false)
 77         GPX1.DAT &= ~0x1;        // led is off
 78     else
 79         GPX1.DAT |= 0x1;       // LED is on
 80 
 81     mydelay_ms(1000);
 82     if(bFlag == false)
 83             GPF3.DAT &= ~(0x1<<4);        // led is off
 84         else
 85             GPF3.DAT |= 0x1<<4;       // LED is on
 86     mydelay_ms(1000);
 87 
 88     if(bFlag == false)
 89                 GPF3.DAT &= ~(0x1<<5);        // led is off
 90             else
 91                 GPF3.DAT |= 0x1<<5;       // LED is on
 92 
 93 }
 94 
 95 void mydelay_ms(int ms)
 96 {
 97     int i, j;
 98     while(ms--)
 99     {
100         for (i = 0; i < 5; i++)
101             for (j = 0; j < 500; j++);
102     }
103 }
104 
105 
106 int main(){
107     peripheral_init();
108     gic_init();
109     len_init();
110     int i = 0;
111         while(1)
112         {
113             printf("i = %d\n", i++);
114             mydelay_ms(800);
115         }
116 
117     return 0;
118 }

 

 

拓展二,由原先的中断使用CPU0,改为使用cpu1;

 代码

  1 #include "exynos_4412.h"
  2 typedef enum
  3 {
  4     false,
  5     true
  6 }bool;
  7 void do_irq()
  8 {
  9     // 获取中断号
 10     unsigned int irq_num = CPU0.ICCIAR & 0x3ff;
 11     switch(irq_num)
 12     {
 13     case 57:
 14         printf("This interrupt id is %d\n", irq_num);
 15 
 16 
 17 
 18                 led_isOn(true);
 19                 mydelay_ms(1000);
 20                 led_isOn(false);
 21                 //mydelay_ms(1000);
 22 
 23 
 24 
 25         EXT_INT41_PEND = 0x1 << 1;    // 清pend(置1清0)
 26         ICDICPR.ICDICPR1 = 0x1 << 25;    // 清中断使能位
 27         break;
 28     case 58:
 29         printf("58This interrupt id is %d\n", irq_num);
 30         break;
 31     default:
 32         printf("Interrupt is not exist!\n");
 33         break;
 34     }
 35 
 36     // 把处理器中处理完的中断号返回给gic
 37     // 告诉gic该中断处理结束,可以送入下一个pending进入
 38     CPU0.ICCEOIR = (CPU0.ICCEOIR & ~(0x3ff)) | irq_num;
 39 }
 40 
 41 void peripheral_init()
 42 {
 43     GPX1.CON = 0xf << 4;        // 配置GPIO为外部中断
 44     EXT_INT41_CON = 0x2 << 4;    // 下降沿触发中断
 45     EXT_INT41_MASK = 0x0;        // 使能相应外设
 46 }
 47 
 48 void gic_init()
 49 {
 50     ICDDCR = 0x1;                        // 使能中断到分配器
 51     ICDISER.ICDISER1 = 0x1 << 25;        // 使能按键中断号
 52     CPU1.ICCICR = 0x1;                 // 把中断从cpu接口送入处理器
 53     // 屏蔽中断优先级,255表示所有中断都允许通过
 54     CPU1.ICCPMR = 0xff;
 55     ICDIPTR.ICDIPTR14 = 0x1 << 8; // 选择cpu接口
 56 }
 57 
 58 void mydelay_ms(int ms)
 59 {
 60     int i, j;
 61     while(ms--)
 62     {
 63         for (i = 0; i < 5; i++)
 64             for (j = 0; j < 500; j++);
 65     }
 66 }
 67 
 68 void len_init(){
 69         GPX1.CON = (GPX1.CON&  (~0xf)) | 0x1;
 70         GPF3.CON = GPF3.CON | (0x1<<16);
 71         GPF3.CON = GPF3.CON | (0x1<<20);
 72         GPX2.CON = GPX2.CON & (~(0xf<<28)) | (0x1<<28);
 73 }
 74 void led_isOn(bool bFlag)
 75 {
 76     if(bFlag == false)
 77         GPX2.DAT &= ~(0x1<<7);        // led is off
 78     else
 79         GPX2.DAT |= 0x1<<7;       // LED is on
 80 
 81     mydelay_ms(1000);
 82 
 83     if(bFlag == false)
 84         GPX1.DAT &= ~0x1;        // led is off
 85     else
 86         GPX1.DAT |= 0x1;       // LED is on
 87 
 88     mydelay_ms(1000);
 89     if(bFlag == false)
 90             GPF3.DAT &= ~(0x1<<4);        // led is off
 91         else
 92             GPF3.DAT |= 0x1<<4;       // LED is on
 93     mydelay_ms(1000);
 94 
 95     if(bFlag == false)
 96                 GPF3.DAT &= ~(0x1<<5);        // led is off
 97             else
 98                 GPF3.DAT |= 0x1<<5;       // LED is on
 99 
100 }
101 int main()
102 {
103     peripheral_init();
104     gic_init();
105 
106     len_init();
107 
108 
109     int i = 0;
110     while(1)
111     {
112         printf("i = %d\n", i++);
113         mydelay_ms(800);
114     }
115 
116     return 0;
117 }

结果

posted @ 2018-09-18 20:52  蓝勃斐重新开始  阅读(1338)  评论(0编辑  收藏  举报