mini2440按键裸机程序编写运行

1.开发环境

操作系统：linux

开发板：mini2440

2.原理图

K1	EINT8	GPG0
K2	EINT11	GPG3
K3	EINT13	GPG5
K4	EINT14	GPG6
K5	EINT15	GPG7
K6	EINT19	GPG11

GPGCON控制寄存器地址：

GPGCON控制寄存器功能说明：

3. 操作流程

（只需要操作GPGCON寄存器即可操作K1按键）

a）设置控制寄存器GPGCON为输入功能：00

(即：可读取GPGDAT寄存器的值)

 //按键
 unsigned long *GPGCON = 0x56000060;
 unsigned long *GPGDAT = 0x56000064;

 *GPGCON &= 0xffffc33c;//只用到4个按键GPG0 GPG3 GPG5 GPG6,功能设为00：输入功能

b）我们按下按键，想让对应的LED1——4，对应点亮，那么LED设置如下：

 //LED
 unsigned long *GPBCON = 0x56000010;
 unsigned long *GPBDAT = 0x56000014;
 *GPBCON &= 0xfffc03ff;<span style="white-space:pre">    span>//功能设置：输出功能 01
 *GPBCON |= 0x00015400;

 //1110 0001 1111
 *GPBDAT &= 0xfffffe1f;
 *GPBDAT |= (0xf<<5);//LED全灭

c）代码如下：

 void key(void)
 {
     //按键
     unsigned long *GPGCON = 0x56000060;
     unsigned long *GPGDAT = 0x56000064;

     //     1100 0011 0011 1100
     //     c      3    3   c
     *GPGCON &= 0xffffc33c;//只用到4个按键GPG0 GPG3 GPG5 GPG6，功能设为00：输入功能

     //LED
         unsigned long *GPBCON = 0x56000010;
         unsigned long *GPBDAT = 0x56000014;
         *GPBCON &= 0xfffc03ff;
         *GPBCON |= 0x00015400;

     //1110 0001 1111
         *GPBDAT &= 0xfffffe1f;
     *GPBDAT |= (0xf<<5);//全亮

     int i;
     int n;
     for(i = 0; i<5; i++)
     {
         *GPBDAT &= 0xfffffe1f;
         for(n = 0; n <0x100000;n++);
         *GPBDAT |= (0Xf<<5);
         for(n = 0; n<0x100000;n++);
     }

     while(1)
     {
         if((*GPGDAT & (1)) == 0)
         {
             *GPBDAT &= ~(1<<5);

         }
         else
         {
             *GPBDAT |= (1<<5);

         }
                 if((*GPGDAT & (1<<3)) == 0)
                 {
                         *GPBDAT &= ~(1<<6);
                 }
                 else
                 {
                         *GPBDAT |= (1<<6);
                 }
                 if((*GPGDAT & (1<<5)) == 0)
                 {
                         *GPBDAT &= ~(1<<7);
                 }
                 else
                 {
                         *GPBDAT |= (1<<7);
                 }
                 if((*GPGDAT & (1<<6)) == 0)
                 {
                         *GPBDAT &= ~(1<<8);
                 }
                 else
                 {
                         *GPBDAT |= (1<<8);
                 }
     }
 }

d）Makefile文件：

 key_test.bin:key_test
     arm-linux-objcopy -O binary ./key_test key_test.bin
 key_test:key_test.o
     arm-linux-ld -Ttext=0x30000000 key_test.o -o key_test
 key_test.o:key_test.c
     arm-linux-gcc -c key_test.c -o key_test.o
 .PHONY:clear copy
 clear:
     rm -rf key_test.o key_test key_test.bin
 copy:
     cp key_test.bin /var/lib/tftpboot/