ARM7 LPC2368 键盘检测：按一下KEY1，L1灯亮，按一下KEY2，L2灯亮，按一下KEY3，L3灯亮，按一下KEY3，L4灯亮.-ARM7 LPC2368 keyboard detection: Click the KEY1, L1 lights, click KEY2, L2 lights, click KEY3, L3 lights, click KEY3, L4 lights.