【正文】 ed long *)0x56000060)define GPGDAT (*(volatile unsigned long *)0x56000064)define GPGUP (*(volatile unsigned long *)0x56000068)define GPHCON (*(volatile unsigned long *)0x56000070)define GPHDAT (*(volatile unsigned long *)0x56000074)define GPHUP (*(volatile unsigned long *)0x56000078) /*UART registers*/define ULCON0 (*(volatile unsigned long *)0x50000000)define UCON0 (*(volatile unsigned long *)0x50000004)define UFCON0 (*(volatile unsigned long *)0x50000008)define UMCON0 (*(volatile unsigned long *)0x5000000c)define UTRSTAT0 (*(volatile unsigned long *)0x50000010)define UTXH0 (*(volatile unsigned char *)0x50000020)define URXH0 (*(volatile unsigned char *)0x50000024)define UBRDIV0 (*(volatile unsigned long *)0x50000028)/*interrupt registes*/define SRCPND (*(volatile unsigned long *)0x4A000000)define INTMOD (*(volatile unsigned long *)0x4A000004)define INTMSK (*(volatile unsigned long *)0x4A000008)define PRIORITY (*(volatile unsigned long *)0x4A00000c)define INTPND (*(volatile unsigned long *)0x4A000010)define INTOFFSET (*(volatile unsigned long *)0x4A000014)define SUBSRCPND (*(volatile unsigned long *)0x4A000018)define INTSUBMSK (*(volatile unsigned long *)0x4A00001c)/*external interrupt registers*/define EINTMASK (*(volatile unsigned long *)0x560000a4)define EINTPEND (*(volatile unsigned long *)0x560000a8) 經(jīng)分析知，SDRAM，GPIO等的寄存器地址，并定義了串口通訊和中段的寄存器地址。對寄存器的設(shè)置是通過位運算，先將想要改變的數(shù)值移至相應(yīng)位時，再通過與，或，非來達到相應(yīng)改變寄存器某一位值的目的。實驗要求（1）環(huán)境設(shè)置完了之后進行程序?qū)懭?。并觀察按鍵按下和松開跑馬燈輪換方向