Re: [Gumstix-users] getting STUART /dev/ttyS2 to work

[Vivek G <vi...@ga...>]

I need to use ttyS2 (STUART) because my application also uses a compact 
flash wifi adapter, which if I recall correctly uses ttyS3 (HWUART).

My setup is like this:

host pc <--1--> gumstix <--2--> rabbit 3000

<--1--> = 802.11b network connection
<--2--> = serial, I plan connect the rabbit via the 3.3v tx/rx lines 
going into the ma3232 on the baseboard. My other option was to use the 
output from the mini-din jack and use an additional ma3232 chip to 
convert to a signal usable by the rabbit, but that seemed like too much 
overhead to deal with.

As of last night, serial output from the gumstix works fine for both 
ttyS3 and ttyS2, I have yet to test input.

thanks for the help! Soon I will be working on the network programming 
part of my project.

cheers,

Vivek G.

mark gross wrote:
> One last comment.
> 
> shouldn't you be trying to use ttyS3, not S2?
> 
> --mgross
> 
> On Saturday 19 March 2005 21:43, Vivek G wrote:
> 
>>I disabled the bluetooth module from starting (just changed the name of
>>it's startup script in /etc/init.d) and also wrote a script similar to
>>yours, but still not having any luck. HOWEVER, I realized after spending
>>  2 hours inspecting schematics that the waysmall board my friend loaned
>>me was for the basix (I assumed he bought the newer one since he bought
>>a connex), so blame me for human error.
>>
>>I'll post again once things get working right...
>>
>>cheers,
>>
>>Vivek G.
>>
>>mgross wrote:
>>
>>>On Saturday 19 March 2005 11:13, Vivek G wrote:
>>>
>>>>Hey everybody,
>>>>
>>>>I'm currently using a Gumstix connex and haven't had any success with
>>>>getting ttyS2 to work with the waysmall_STUART board(tested via
>>>>oscilloscope/serial terminal).
>>>>
>>>>So far, I've followed the tips and tricks page and previous mlist posts
>>>>by doing the following:
>>>>
>>>># echo "AF2 in" > /proc/gpio/GPIO46
>>>># echo "AF1 out" > /proc/gpio/GPIO47
>>>># stty -F /dev/ttyS2 -ixon speed 115200
>>>
>>>This is about what I do, only think I could guess at are
>>>1) are you making sure the BT modules are not loaded, and
>>>2) are you loading the gpio module?
>>>
>>>Using the second serial port on the Waysmall gumstix board.
>>>
>>>   1. edit the rc files to not load the blue tooth modules.
>>>   2. load the gpio modules
>>>   3. setup ttyS3 using stty (note the defaults will not work well for
>>>the Mark-iii serial port sample program.  The thing echoes inbound data
>>>back causing trouble.)
>>>   4. RX,GND,TX are the 3 pins in the middle row of the mini-8
>>>connectedor. GND is the center pin.
>>>   5. use /dev/ttyS3 to send or get data.
>>>   6. note that a cr/lf gets sent out the ttyS3 port when its closed.
>>>
>>>The following is a script I use to setup the serial port.
>>>ttyS3.sh:
>>>
>>>#!/bin/sh
>>>
>>>
>>>modprobe proc_gpio
>>>
>>>echo AF1 in > /proc/gpio/GPIO49
>>>
>>>echo AF1 out > /proc/gpio/GPIO48
>>>
>>>cat /proc/gpio/GPIO4[89]
>>>
>>>
>>>stty -F /dev/ttyS3 ixoff clocal ixany -ixon -echo -echonl ospeed 38400
>>>ispeed 38400
>>>
>>>stty -F /dev/ttyS3 ixoff clocal ixany -ixon -echo -echonl ospeed 38400
>>>ispeed 38400
>>>
>>>
>>>>and then testing the port by writing:
>>>>
>>>># echo "hello world" > /dev/ttyS2
>>>># cat sometext.txt > /dev/ttyS2
>>>>
>>>>and reading:
>>>>
>>>># cat /dev/ttyS2 (and then I'd type in things on the other side)
>>>>
>>>>So far, I haven't had any success, and was wondering if there's
>>>>something that I am missing.
>>>>
>>>>
>>>>Cheers,
>>>>
>>>>Vivek G.
>>>>
>>>>
>>>>
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> 
> 
> 
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