Re: VMIC VMIVME 4105 register cannot be modified?

[Andrew Johnson <anj@aps.anl.gov>]

Hi,

On Sunday 24 April 2011 22:26:44 马晓媛 wrote:
> 
> I worked with VMIVME 4105, but now it comes across some problem that I
>  cannot handle.VMIVME 4105 is a 8channel 12bits multiplying DAC board. I
>  modified the driver of VMIVME 4100 to 4105's driver. VMIVME 4100 is a
>  16channel 12bit DAC board. They are alike.
...
> Now I can configure the CSR, BUT, I cannot write D15 to "0" to write data
>  to DAC channels. Why? I need your help. Thank you very much!^_^

When you say you cannot do that, what actually happens when you try writing a 
16-bit value with D15=0 to one of the DAC OUT registers?

Please copy & paste and command you're using and the error messages you see 
directly from the system console, and include more information rather than 
less if you're not sure what might be relevant.  You should also explain what 
CPU board, OS version and driver you are using.  We can't help you very much 
without knowing more about what you are doing.

- Andrew
-- 
An error is only a mistake if you don't learn from it.
When you learn something from it, it becomes a lesson.