贴个裸机扫盲，以防哪天被花盆砸中，记忆全无。（纯水贴，，活着）
//1 mode config
#define ON 0x0
//2 port register define
#define rGPBCON (* (volatile unsigned *) 0x56000010) // Port B control, from datasheet
//3 prt init
void LedInit(void)
{
rGPBCON = (rGPBCON & 0xfffffff0) | 0x5; // from datasheet
}