新手入门，请教IO口配置

只看该作者 · 2010-11-20 11:02

#define IO0PIN       (*((volatile unsigned long *) 0xE0028000))
#define IO0SET       (*((volatile unsigned long *) 0xE0028004))
#define IO0DIR       (*((volatile unsigned long *) 0xE0028008))
#define IO0CLR       (*((volatile unsigned long *) 0xE002800C))

      int main (void)

{// add user source code
//PINSEL0=0xE002C000;
PINSEL0=0x00000000;
IO0DIR = 0xffffffff;
IO0SET = 0xffffffff;
IO0CLR = 0x00000000;

while(1);
return 0;
}

用的是开发板的工程模板，怎么IO电平不能拉低呢？请各位高手不吝赐教