You have a serial console running on com2. Check /etc/inittab
Le 14 oct. 2010 Ã 11:16, Petr Åtetiar <> a Ãcrit :
> yetanotherdjmorris <> [2010-10-12 20:57:47]:
>
>> I have a TS-7260 trying to communicate with an RS232 device (a motor). I
>> can open my port, set my baud, send data to the device, the motor moves,
>> sends a response back, which I can read. Then I start a polling loop where
>> I continually call iReturn = ioctl(fd, FIONREAD, &iBytesAvail) and then
>> sleep for 20ms. Eventually (like after 100 iterations), this returns -1
>> with an errno = EIO (input/output error). I can close the port and reopen
>> and it works, but again, only for a few seconds before I get that error
>> again.
>>
>> Any thoughts?
>
> I'm repeating myself, but why is everybody reinventing the wheel again and
> again? I know, that using RS232 port is such a common task, that I wrote a
> library[1] for it, licensed it under very liberal MIT license, so everybody
> can use it. You can use it in the same way under Linux, Windows and even under
> Windows CE/Mobile. There's even a Lua bindings, so you can use it for fast
> prototyping, example (-- is one line comment in Lua):
>
> :~/$ lua
> Lua 5.1.4 Copyright (C) 1994-2008 Lua.org, PUC-Rio
>> rs232 = require("luars232") -- loads the RS232 library
>>
>> error, port = rs232.open("/dev/ttyAM0") -- opens the port
>> port:set_baud_rate(rs232.RS232_BAUD_115200) -- sets baudrate to 115200
>>
>> read = 5 -- read just bytes
>> timeout = 20 -- miliseconds
>> error, data, len = port:read(read, timeout) -- read the data
>> if len == read then -- if we've read 5 bytes, send OK to the sender
>> port:write("OK\n")
>> end
>> port:close() -- cleanup
>
> BTW Lua is really fast, so in most of the cases, I would say in 99%, you don't
> even need to write any C code, you'll just need to compile the luars232
> library and Lua. You can even prototype it on the desktop PC and then just
> copy the final Lua script to the device and it should work in the same way as
> it was working on the desktop. Easy, fast.
>
> 1. http://github.com/ynezz/librs232
>
> -- ynezz
>
>
> ------------------------------------
>
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