问个裸板问题：为什么一运行灯总是全亮了的,,，，百度google了还是没法呀我是mini2440的板子，
#define GPGCON (*(volatile unsigned long *)0x56000060)
#define GPGDAT (*(volatile unsigned long *)0x56000064)
#define GPBCON (*(volatile unsigned long *)0x56000010)
#define GPBDAT (*(volatile unsigned long *)0x56000014)
/*
* LED1,LED2,LED4对应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))
#define GPB5_msk (3<<(5*2))
#define GPB6_msk (3<<(6*2))
#define GPB7_msk (3<<(7*2))
#define GPB8_msk (3<<(8*2))
/*
* K1,K2,K3,K4对应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))
#define GPG0_msk (3<<(0*2))
#define GPG3_msk (3<<(3*2))
#define GPG5_msk (3<<(5*2))
#define GPG6_msk (3<<(6*2))
int main()
{
unsigned long dwDat;
// LED1,LED2,LED3,LED4对应的4根引脚设为输出
GPBCON &= ~(GPB5_msk | GPB6_msk | GPB7_msk | GPB8_msk);
GPBCON |= GPB5_out | GPB6_out | GPB7_out | GPB8_out;
// K1,K2,K3,K4对应的4根引脚设为输入
GPGCON &= ~(GPG0_msk | GPG3_msk | GPG5_msk | GPG6_msk);
GPGCON |= GPG0_in | GPG3_in | GPG5_in | GPG6_in;
while(1){
//若Kn为0(表示按下)，则令LEDn为0(表示点亮)
dwDat = GPGDAT; // 读取GPF管脚电平状态
if (dwDat & (1<<0)) // K1没有按下
GPBDAT |= (1<<5); // LED1熄灭
else
GPBDAT &= ~(1<<5); // LED1点亮
if (dwDat & (1<<3)) // K2没有按下
GPBDAT |= (1<<6); // LED2熄灭
else
GPBDAT &= ~(1<<6); // LED2点亮
if (dwDat & (1<<5)) // K3没有按下
GPBDAT |= (1<<7); // LED3熄灭
else
GPBDAT &= ~(1<<7); // LED3点亮
if (dwDat & (1<<6)) // K4没有按下
GPBDAT |= (1<<8); // LED4熄灭
else
GPBDAT &= ~(1<<8); // LED4点亮
}
return 0;
}
