原帖由 yuanyc5877 于 2011-10-11 21:22 发表 谢谢，就用这个HWREGB在试，可能是前面没搞对，我再看看。再次感谢

 

参考一下hw_types.h里面的定义吧

//*****************************************************************************
//
// Macros for hardware access, both direct and via the bit-band region.
//
//*****************************************************************************
#define HWREG(x)                                                             
        (*((volatile unsigned long *)(x)))
#define HWREGH(x)                                                            
        (*((volatile unsigned short *)(x)))
#define HWREGB(x)                                                            
        (*((volatile unsigned char *)(x)))
#define HWREGBITW(x, b)                                                      
        HWREG(((unsigned long)(x) & 0xF0000000) | 0x02000000 |               
              (((unsigned long)(x) & 0x000FFFFF) << 5) | ((b) << 2))
#define HWREGBITH(x, b)                                                      
        HWREGH(((unsigned long)(x) & 0xF0000000) | 0x02000000 |              
               (((unsigned long)(x) & 0x000FFFFF) << 5) | ((b) << 2))
#define HWREGBITB(x, b)                                                      
        HWREGB(((unsigned long)(x) & 0xF0000000) | 0x02000000 |              
               (((unsigned long)(x) & 0x000FFFFF) << 5) | ((b) << 2))