[mythtv-users] Serial control of a TV

[Yan Seiner]

George Nassas wrote:
> On 14-Mar-09, at 2:11 AM, Greg Newton wrote:
>
>> I'd stick with the line-ends theory too - the manual for my LC46PD7X
>> says "Eight ASCII codes + CR" - maybe try
>>
>> echo -e "POWR0  \r"
>
>
> Not sure what the -e is doing but echo sends a newline (\n) after its 
> output. The TV might be taking that newline as the start of its next 
> command and, deciding it doesn't like it, ignoring everything until 
> the next \r.
>
> The shell printf command doesn't send any extra characters so a printf 
> "POWER0 \r" might do it for you and also leave the TV in a good state 
> for the next command. echo -n works too if you're without printf.

-e enables parsing of special characters like '\r'.

I like the idea of printf.  For some reason, the TV just doesn't like 
echo - I've now figured out that out of maybe 20 attempts one succeeds.  
OTOH minicom succeeds 100% of the time.

I'll try printf when the TV is not in use....

--Yan

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