rGPBUP = 0x7ff;
rGPFCON = 0xaaaa;
rSRCPND = 0x17;
rINTMSK = ~0x17;
rINTPND =0x17;
rEINTPEND = (1<<4);
rEINTMASK = ~(1<<4);
rEXTINT0 = 0x20222;
light = 0x0;
rGPBDAT = ~light;
pISR_EINT0 = (U32)Key4_ISR;
pISR_EINT1 = (U32)Key1_ISR;
pISR_EINT2 = (U32)Key3_ISR;
pISR_EINT4_7 = (U32)Key2_ISR;
while(1)
;
}