Re: [gentoo-embedded] High Speed Serial Problem

[Bob Dunlop]

Hi,

> The Linux app has a separate thread for each of the 2 serial ports.
> Data is received using select() and read().  Read is called with a 32
> byte buffer.  As neither BRKINT nor IGNBRK is set, the input thread
> recognizes 0xFF, 0x00, 0x00 sequences as breaks.  When the encoded
> break is recognized, any pending message is sent.

There should be no problem handling 115K2 data at full speed on a 300MHz
processor although some SOC UARTs are realy gnarly.  Using line break as
a protocol signalling element is so 1970s but again shouldn't be a problem.

What are your VMIN, VTIME settings ? They can have a big impact on read
performance/timing.  VMIN=VTIME=0 makes a mockery of using select for
example.

What size of return are you actually seeing from the read ?

If you are seeing reasonably full blocks, does you code handle the three char
break sequence spanning the read boundy ?  Sorry if this is teaching grandma
to suck eggs.

-- 
        Bob Dunlop