Driver para decibelímetro

driver.sh

#!/bin/bash

initialize(){
	random=$(printf '\\x%x' $((RANDOM%256)) $((RANDOM%256)) $((RANDOM%256)))
	local buffer="\xb3$random\x00\x00\x00\x00"
	echo "Initializing with $buffer"
	echo -ne "$buffer" > /dev/hidraw2
}

get_status(){
	status=
	while (( ${#status} != 8 )); do
		status+=$(timeout 0.5 head -c8 /dev/hidraw2)
		echo $status ${#status}
	done
	reply=$(echo -n "$status" | hexdump -e '"%d"')
}

print_db(){
	get_status
	db=${reply:0:2}.${reply:2}
	local now=$(date "+%Y-%m-%d %H:%M:%S")
	echo "$now	$db"
}

initialize
while true; do
		print_db
done