[SOLVED] Serial port only works after I run minicom

[garland3]

Hi,
I'm running the Angstrom Distro on an overo gumstick.

I'm trying to run the obdgpslogger program.

The program only correctly connects to the serial port after I run minicom.

I run minicom at 9600 and no flow control.

When I reboot the serial port goes back to its initial configuration and I can't communicate with it.

Seems like I should use stty or setserial, but I'm confused and need some help.

How can I configure the serial port correctly without needing to run minicom.

All the best,

Anthony G.

[atreyu]

try this stty command:

stty -F /dev/ttyS0 -ixon -ixoff

check this thread for an explanation of stty options.

if that works, you can stick in a start-up file, to be called every time the system reboots. Look for a file like /etc/rc.local or /etc/rc.d/rc.local or similar.

[garland3]

Thanks.
I tried this and it worked. I put it right before I call the obdgpslogger in the startup scripts.

stty -F /dev/obdii -crtscts -clocal ispeed 9600 ospeed 9600
./obdgpslogger -s /dev/obdii -a 2 -d /home/root/obd.db &

and I made a udev script

# Put this in /etc/udev/rules.d/ as 99-usb-serial.rules

# for the usb gps.
SUBSYSTEM=="tty", ATTRS{idVendor}=="067b", ATTRS{idProduct}=="2303", SYMLINK+="usbgps"

# the ftdi, obdii to serial to usb
SUBSYSTEM=="tty", ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6001", ATTRS{serial}=="A800JRNJ", SYMLINK+="obdi"

[atreyu]

that's cool with the udev stuff. you know you can even combine them: add the stty command to the udev rule. you can try something like this:

RUN+="/path/to/stty-script.sh"

you'd put that after one of your matching SUBSYSTEM lines.

[garland3]

I was having issues were sometimes the gps ended up /dev/ttyUSB0 and sometimes the obdii->serial->usb converter ended up being /dev/ttyUSB0, so I needed the udev script to help differentiate the two.

Thanks for the help!