怎样去解决ARM读写sja1000的问题呢？

我是用S3C2416做的cpu，系统用WINCE，扩展SJA1000的CAN模块，做驱动时遇到的困难，就是底层读写SJA1000寄存器出的错误，参考的是周立功的书。然后从串口打印观察，每次读出的寄存器值都不对，是最近一次写入的值，又懂得大神，请指导

void SJA1000_ReadRegister(UINT8 reg, UINT8 *value)
{
//g_lpBaseSJA1000[8] = reg;
//*value = (UINT8)g_lpBaseSJA1000[4];

WRITE_REGISTER_UCHAR((PUCHAR)&g_lpBaseSJA1000[7], reg);
*value = READ_REGISTER_UCHAR((PUCHAR)&g_lpBaseSJA1000[0]);

RETAILMSG(1,(TEXT("read from reg [0x%02x]=[0x%02x]\r\n"),reg,*value));

}

void SJA1000_WriteRegister(UINT8 reg, UINT8 value)
{
//g_lpBaseSJA1000[4] = reg;
//g_lpBaseSJA1000[8] = value;

WRITE_REGISTER_UCHAR((PUCHAR)&g_lpBaseSJA1000[7], reg);
WRITE_REGISTER_UCHAR((PUCHAR)&g_lpBaseSJA1000[0], value);
RETAILMSG(1,(TEXT("write value to reg [0x%02x]=[0x%02x]\r\n"),reg,value));

}