使用bash和raspberry pi 3从USB设备读取数据？

Question

I'm trying to catch the response from a device that is connected to the USB. With this code:

sudo stty -F /dev/ttyUSB0 speed 115200 cs8 -cstopb -parenb -echo
sudo stty raw; cat > /home/received.log < /dev/ttyUSB0
echo "Monitor started"

On port ready, send the command request to the device

echo -en '\x5A\x00\x00\x0D\x0A\x71' > /dev/ttyUSB0

then read the log and paste the response in another file converting it properly xxd -plain /home/received.log > /home/output.txt

so I can show the data, cat -v < /home/output.txt

But I'm needing something more stable, that code is showing me this error:

stty: 'standard input': Inappropriate ioctl for device

which is weird, because it was working...

I would like to catch the response and store it in a variable.

Answer 1

i suggest getting rid of the stty raw .

Unless you are sending/receiving special characters that the tty subsystem will process, which is unlikely - because you said it is working - you almost certainly won't need it.

If it did work, you might find some undesirable side effects such as:

• backspace does not erase a character that you miss-typed
• control-c won't terminate your process

and other things that you might rely on in your terminal session.

FWIW, i am doing a similar thing with Arduino to Mac, Windows (cygwin) & Linux (read from the usb/serial port) and i have not been tempted to stty raw in any of those environments.