TQ2440 查询法实现按键LED的功能

以下是TQ2440裸奔按键LED功能的程序

init.s

AREA init, CODE, READONLY

start LDR SP,=4096

import main

bl main

end

def.h

#ifndef __DEF_H__

#define GPBCON (*(volatile unsigned int*) 0x56000010)

#define GPBDAT (*(volatile unsigned int*) 0x56000014)

#define GPFCON (*(volatile unsigned int*) 0x56000050)

#define WTCON (*(volatile unsigned int*) 0x53000000)

#define GPFDAT (*(volatile unsigned int*) 0x56000054)

#define KEY1 0x02

#define KEY2 0x10

#define KEY3 0x04

#define KEY4 0x01

#define LED1 0x1cf

#define LED2 0x1bf

#define LED3 0x17f

#define LED4 0x0ff

#define LED_OFF 0x1ff

#endif

main.c

#include "def.h"

void delay(unsigned int a)

{

while (a--);

}

void init()

{

WTCON = 0;//使看门狗无效

GPBCON &= ~((3<<2*5)|(3<<2*6)|(3<<2*7)|(3<<2*8));

GPBCON |= ((1<<2*5)|(1<<2*6)|(1<<2*7)|(1<<2*8));//5,6,7,8口输出(01输出)

GPFCON &= ~((3<<2*0)|(3<<2*1)|(3<<2*2)|(3<<2*4));//0,1,2,4口输入(00输入)

}

main()

{

init();

while (1)

{

if (!(GPFDAT & KEY4))

{

delay(5000);

while (!(GPFDAT & KEY4))

{

GPBDAT = LED4;

}

}

else

GPBDAT = LED_OFF;

/***********按键4点亮LED4，松手LED4灭*****************/

if (!(GPFDAT & KEY1))

{

delay(5000);

while (!(GPFDAT & KEY1))

{

GPBDAT = LED1;

}

}

else

GPBDAT = LED_OFF;

/***********按键1点亮LED1，松手LED1灭*****************/

if (!(GPFDAT & KEY2))

{

delay(5000);

while (!(GPFDAT & KEY2))

{

GPBDAT = LED2;

}

}

else

GPBDAT = LED_OFF;

/***********按键2点亮LED2，松手LED2灭*****************/

if (!(GPFDAT & KEY3))

{

delay(5000);

while (!(GPFDAT & KEY3))

{

GPBDAT = LED3;

}

}

else

GPBDAT = LED_OFF;

/***********按键3点亮LED3，松手LED3灭*****************/

}

}