ARM9上灯实验

/* key_led.c */#define GPBCON      (*(volatile unsigned long *)0x56000010)#define GPBDAT      (*(volatile unsigned long *)0x56000014)#define GPGCON      (*(volatile unsigned long *)0x56000060)#define GPGDAT      (*(volatile unsigned long *)0x56000064)/* * LED1~4,GPB5/GPB6/GPB7/GPB8 */#define GPB5_out        (1 << (5 * 2))#define GPB6_out        (1 << (6 * 2))#define GPB7_out        (1 << (7 * 2))#define GPB8_out        (1 << (8 * 2))/* * KEY1~4, GPG0/GPG3/GPG5/GPG6 */#define GPG0_in     (0 << (0 * 2))#define GPG3_in     (0 << (3 * 2))#define GPG5_in     (0 << (5 * 2))#define GPG6_in     (0 << (6 * 2))int main(){        unsigned long dwDat;        GPBCON = GPB5_out | GPB6_out | GPB7_out | GPB8_out;        GPGCON = GPG0_in & GPG3_in & GPG5_in & GPG6_in;        while(1)        {            dwDat = GPGDAT;                     /* 对应位同1做与运算，低电平LED亮 */            if (dwDat & (1<<0))                 GPBDAT |= (1 << 5);       // LED1 turn off            else                GPBDAT &= ~(1 << 5);      // LED1 turn on            if (dwDat & (1<<3))                GPBDAT |= ( 1 << 6);      // LED2 turn off            else                GPBDAT &= ~(1 << 6);      // LED2 turn on            if (dwDat & (1<<5))                GPBDAT |= (1 << 7);       // LED3 turn off            else                GPBDAT &= ~(1 << 7);      // LED3 turn on            if (dwDat & (1 << 6))                GPBDAT |= (1 << 8);        // LED4 turn off            else                GPBDAT &= ~(1 << 8);      // LED4 turn on        }    return 0;}