I found 2 more things,

1. Using POSE, the results are the same as I've seen on the hardware.

2. Using gdb, I can find that my program really modify the register. But 
after another event coming and I check the register, it is modified (by 
the OS?) back to 0xFE.

Any suggestions for me?

tim wrote:

> Dear all,
>
> I would like to shorten the time between two consecutive LLP signals of
> the LCD panel. And I search the EZ processor manual and find that this
> can be done by modifying the LRRA register (0xFFFFFA29).
>
> However, I cannot see any change in this register when I check this
> register by DragonRegs utility, it is fixed at 0xFE, no matter I set it
> to 0xFD or 0xFF.
>
> Why is this register so different? I can change the LCKCON (0xFFFFFA27)
> & LPOSR (0xFFFFFA2D) and see the difference both on the screen and the
> DragonRegs.
>
> Can anyone give me a suggestion about how to change this register or
> other means to solve my problem?




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