mini2440 按键 实验 （二）

实验目的：按键控制led灯

实验环境： mini2440（arm920t）

工具： ads1.2 h-jtag1.0 

步骤：

1.在ads中新建key工程，添加文件init.s main.c如下

init.s

    area init,code,readonly
start
    ldr sp,=4096
    import main
    bl main
    end

main.c

#define rGPBCON  (*((volatile unsigned *)0x56000010))
#define rGPBDATA (*((volatile unsigned *)0x56000014))

#define rGPGCON  (*((volatile unsigned *)0x56000060))
#define rGPGDATA (*((volatile unsigned *)0x56000064))

#define LED1_ON rGPBDATA &=(~(1<<5))
#define LED2_ON rGPBDATA &=(~(1<<6))
#define LED3_ON rGPBDATA &=(~(1<<7))
#define LED4_ON rGPBDATA &=(~(1<<8))

#define LED1_OFF rGPBDATA |=(1<<5)
#define LED2_OFF rGPBDATA |=(1<<6)
#define LED3_OFF rGPBDATA |=(1<<7)
#define LED4_OFF rGPBDATA |=(1<<8)


void delay(int i)
{
    while(i--);
}

int main()
{
    rGPBCON = 0x15400;
    rGPGCON = 0x2882;
    LED1_OFF;
    LED2_OFF;
    LED3_OFF;
    LED4_OFF;

    while(1)
    {
        if((rGPGDATA&=(1<<0)) == 0)
        {
            delay(100);
            if((rGPGDATA&=(1<<0)) == 0)
            {
                LED1_ON;
                delay(100000);
            }
        }
        if((rGPGDATA&=(1<<3)) == 0)
        {
            delay(100);
            if((rGPGDATA&=(1<<3)) == 0)
            {
                LED2_ON;
                delay(100000);
            }
        }
        if((rGPGDATA&=(1<<5)) == 0)
        {
            delay(100);
            if((rGPGDATA&=(1<<5)) == 0)
            {
                LED3_ON;
                delay(100000);
            }
        }
        if((rGPGDATA&=(1<<6)) == 0)
        {
            delay(100);
            if((rGPGDATA&=(1<<6)) == 0)
            {
                LED4_ON;
                delay(100000);
            }
        }


        LED1_OFF;
        LED2_OFF;
        LED3_OFF;
        LED4_OFF;
    }
    return 0;
}

2.ADS AXD H-JTAG的配置同led程序。

备注 ：

    判断按键是否按下时，通过延时一段时间做第二次判断，实现按键去抖。