[HLUG] Serial port setting

[Alan Carter]

Hi,

I assume you are using a PIC or something similar. Using different  
baud rates will give you smaller errors i.e.: 33600 give around 0.,7%  
error.
Small errors should not cause problems.

Alan


On 24 Apr 2008, at 14:52, Mark Broadbent wrote:

> Hi Paul,
>
> On 20/04/2008, paul.maddox.mail-list at synth.net
> <paul.maddox.mail-list at synth.net> wrote:
>> Andy,
>>
>>> The valid baud rates are listed in /usr/include/asm-i386/termbits.h
>>> and 62500 isn't one of them.  I believe you'll need to patch your
>>> kernel a bit like this:
>>
>> Hmmm, that's a bit awkward for me, but I'll look into it, thanks.
>>
>>> It would seem a lot easier to just change the other device to 57600
>>> or 115200, but I suppose there is a good reason why this isn't
>>> possible in your case..
>>
>> The device attached is an 8 bit micro and because it's running from a
>>  16Mhz clock anything that's non divisible gives me errors, for  
>> example at
>>  115200 I get 3.7% rate error (ie, it's 3.7% off the correct  
>> rate). At
>>  31250 (MIDI) and 62500 (double MIDI) I get 0%.
>>
>>  I'll have a tinker and see what I can do.
>>
>>  This explains what I'm doing - http://qix.synth.net/Blog/?p=6
>>  And this is the background - http://qix.synth.net/
>
> This might be an weird suggestion but why don't you get a MIDI card
> and use that to communicate with your board?
>
> Thanks
> Mark
>
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