[Gllug] serial trigger level

[Peter Childs]

Chris Bell wrote:

>On Wed 03 Dec, t.clarke wrote:
>  
>
>>I am speaking totally from memory, but I though 'setserial' or at least some
>>other command allowed you to change the trigger level without recompiling
>>the kernel.    Alternatively, it might have been some frig that modded a
>>flag in the kernel to take effect on reboot.
>>Sorry, not very helpful, but if I find anything later and no-one else
>>has come up with anything I will re-post.
>>
>>What CPU are you using ?  - anything half decent should not be dropping
>>serial interrupts unless you are hammering it to death !!
>>
>>Tim
>>
>>    
>>
>   Are you having problems caused by different earths, or low signal levels?
>You could try a ferrite common mode filter that clips round the cable, or a
>few turns through a larger ferrite core (I use the core from an old TV line
>output transformer), otherwise optical isolators or pulse transformers.
>
>  
>
    Its not garbled messages as that would produce its sending. Its 
missing characters. The error can be recreated with a python script and 
a loop back cable.  :)
    Yes setserial should be the right command but it seams to be a 
missing feature.  Current theory is I can reporgram the uart with a one 
line C program. So I might have to patch setserial and give the patch to 
the right developer... (Grone..)

Peter Childs


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