Julio-Guerra/bug.sh

## bug.sh
#!/bin/bash

set -e

: ${1?"missing argument 1: device node (e.g. /dev/ttyAMC0)"}
dev=$1

stty -F $dev 9600 raw min 8

# open the device once, with file descriptor 4
exec 4<>$dev

# necessart sleep to avoid device problems
function cooldown() {
    sleep 0.04
}

function dump() {
    hexdump -C
    # newline
    echo
}

function state() {
    # state request
    echo -ne "\xFF\x09\x00" >&4
    cooldown
    # read the answer: exactly 8 bytes
    # dd is used because it does not change the tty settings and
    # does not expect only ascii.
    dd bs=1 count=8 <&4 2>&- | dump
    cooldown
}

while true; do
    state
done

# close the file descriptor
exec 4>&-
	#!/bin/bash

	set -e

	: ${1?"missing argument 1: device node (e.g. /dev/ttyAMC0)"}
	dev=$1

	stty -F $dev 9600 raw min 8

	# open the device once, with file descriptor 4
	exec 4<>$dev

	# necessart sleep to avoid device problems
	function cooldown() {
	sleep 0.04
	}

	function dump() {
	hexdump -C
	# newline
	echo
	}

	function state() {
	# state request
	echo -ne "\xFF\x09\x00" >&4
	cooldown
	# read the answer: exactly 8 bytes
	# dd is used because it does not change the tty settings and
	# does not expect only ascii.
	dd bs=1 count=8 <&4 2>&- \| dump
	cooldown
	}

	while true; do
	state
	done

	# close the file descriptor
	exec 4>&-