mini2440按键查询方式控制led灯亮灭

 

option设置：

target项配置如下：

user项配置如下：

代码：

#define rGPBCON (*(volatile unsigned *)0x56000010) //Port B control

#define rGPBDAT (*(volatile unsigned *)0x56000014) //Port B data

#define rGPBUP (*(volatile unsigned *)0x56000018) //Pull-up control B



#define rGPGCON (*(volatile unsigned *)0x56000060) //Port G control

#define rGPGDAT (*(volatile unsigned *)0x56000064) //Port G data

#define rGPGUP (*(volatile unsigned *)0x56000068) //Pull-up control G



int Wait_key(void);

void key_init(void);

void Led1_on(void);

void Led1_off(void);

void Led1_init(void);



void delay(int times)

{

int i,j;

for(i=0;i<times;i++)

for(j=0;j<400;j++);

}



void main(void)

{

int flag = 0;



Led1_init();



while(1)

{

if(Wait_key())

{

flag = ~flag;

if (flag)

Led1_on();

else

Led1_off();

}

}

}



void Led1_init(void)

{

rGPBCON &= ~(3<<10);

rGPBCON |= (1<<10);

}



void Led1_on(void)

{

rGPBDAT &=~(1<<5);

}



void Led1_off(void)

{

rGPBDAT |=(1<<5);

}



int Wait_key(void)

{

if(!(rGPGDAT & 0x1))

delay(200);

if(!(rGPGDAT & 0x1)) /*为什么又要判断?消抖*/

{

while(!(rGPGDAT & 0x1));/*等待释放*/

return 1;

}

else

return 0;

}