#!/bin/bash
# USAGE: jevois-cmd [-d /dev/ttyACMX] command
#
# Send a command to a connected JeVois camera using the serial-over-USB port
#
# Tip: If things appear garbled in some way, maybe your TTY settings got messed up. Run screen /dev/ttyACM0 115200 to
# reset to the expected state.
#
# You may need to install: sudo apt install python-serial

ttydev="/dev/ttyACM0"
if [ "X$1" = "X-d" ]; then ttydev=$2; shift 2; fi 

if [ ! -c "$ttydev" ]; then echo "Cannot access $ttydev -- is JeVois plugged in? -- ABORT"; exit 1; fi

# Set the tty flags:
sudo stty -F "${ttydev}" sane raw igncr clocal cread -echo

# First read any accumulated junk in the serial buffers:
while true; do
    sudo bash -c "read -s -t 0.05 < \"${ttydev}\""
    if [ $? -ne 0 ]; then break; fi
done

# Make a python program:
prog="import serial
ser = serial.Serial('$ttydev', 115200, timeout=1)
ser.write('$*\n')
nothing=1
out = ''
while nothing or ser.inWaiting() > 0:
    out += ser.read(1)
    nothing=0
if out != '':
    print out,
"

# Send the command:
sudo python2.7 -c "$prog"