registeraccess.c

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/****************************************Copyright (c)**************************************************
**                               Guangzhou ZHIYUAN electronics Co.,LTD.
**                                     
**                                 http://www.embedtools.com
**
**--------------File Info-------------------------------------------------------------------------------
** File Name: RegisterAccess.c
** Last modified Date: 2006-11-15 
** Last Version: v1.0
** Description: Stellaris系列单片机寄存器访问
** 
**------------------------------------------------------------------------------------------------------
** Created By: Zhou Lishan
** Created date: 2006-11-15 
** Version: v1.0
** Descriptions:
**
**------------------------------------------------------------------------------------------------------
** Modified by:
** Modified date:
** Version:
** Description:
**
********************************************************************************************************/

#define HWREG(x)            (*((volatile unsigned long *)(x)))
#define HWREGH(x)          (*((volatile unsigned short *)(x)))
#define HWREGB(x)          (*((volatile unsigned char *)(x)))

int main( void )
{
  unsigned long temp32;
  unsigned long temp16;
  unsigned long temp8;
  HWREG(0x20000000) = 0xAA55AA55;		// 向0x20000000地址写入0xAA55AA55
  temp32 = HWREG(0x20000000);			// 读0x20000000地址内容
  if( temp32 != 0xAA55AA55 )			// 比较写入与读出的内容是否一致
      while(1);					// 写入与读出不一致

  HWREGH(0x20000000) = 0x55AA;                  // 向0x20000000地址写入0x55AA
  temp16 = HWREGH(0x20000000);			// 读0x20000000地址内容
  if( temp16 != 0x55AA )			// 比较写入与读出的内容是否一致
      while(1);					// 写入与读出不一致

  HWREGB(0x20000000) = 0xA5;                    // 向0x20000000地址写入0xA5
  temp8 = HWREGB(0x20000000);			// 读0x20000000地址内容
  if( temp8 != 0xA5 )                           // 比较写入与读出的内容是否一致
      while(1);					// 写入与读出不一致

  while(1);

}