mini2440第一个裸机程序

/*
 * 功能：实现LED1灯循环亮灭
 * LED1--GPB5
 * LED2--GPB6
 * LED3--GPB7
 * LED4--GPB8
 */
#define rGPBCON (*(volatile unsigned long *) 0x56000010)
#define rGPBDAT (*(volatile unsigned long *) 0x56000014)

#define Led1_On        0x1DF
#define Led2_On        0x1BF
#define Led3_On        0x17F
#define Led4_On        0xFF

#define DELAY_CNT     0x3000
void Led_Port_Init( void );

void delay( int t )
{
    while(t>0)
        t--;
}

int main( void )
{
    Led_Port_Init();
    while ( 1 )
    {
        //循环点亮4盏灯
        rGPBDAT = Led1_On;
        delay( DELAY_CNT );
        rGPBDAT = Led2_On;
        delay( DELAY_CNT );
        rGPBDAT = Led3_On;
        delay( DELAY_CNT );
        rGPBDAT = Led4_On;
        delay( DELAY_CNT );    
    }
}

void Led_Port_Init( void )
{
    /* 设置GPB5,6,7,8为输出端口 */
    rGPBCON = 0X15400;
}