请教一下：我需要实现：按下Key时，p0.6输入为0，输出enableP2.4=0,但实验室，按键输入没反映。为什么？？谢谢！
#define enable (1<<4) //p2.4 is enable motor.0X00000010
#define key (1<<6) //p0.6 is connect key
int main (void) {
int i;
PINSEL4 |=0x00000010; //set GPIO P2.4,(p2.2is PWM function)
PINSEL0 |=0X00000000; //SET GPIO P0.6
FIO2DIR |=0x00000010; //pin p2.4 is an output
FIO0DIR =0; //PIN P0.6 IS INPUT
if ((FIO0PIN & key)==0) FIO2CLR=enable; //set p2.4=0,motor stop,(when press key,p0.6=0)
else FIO2SET=enable; //set p2.4=1(when release key,p0.6=1)
pwm_init(); //initialize pwm
PINSEL4 |= 0x10; //PWM outputs its signal at GPIO Port 2.2
pwm_setup(3, PWM_SINGLE);
pwm_write(3,50);
}
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