#!/bin/sh
# DS2482-100 Single Channel 1-Wire Master


CONFIG=0xf0
if [ "${1}" = overdrive ]; then
	CONFIG=0x78
fi

vusb-i2cset 0x18 0xf0 || echo "Failed to reset chip"
vusb-i2cset 0x18 0xd2 $CONFIG || echo "Failed to set config"
vusb-i2cset 0x18 0xb4 || echo "Failed to initiate presence detection (OWR)"

ret=$(( $(vusb-i2cget 0x18 1 0xe1 0xf0) & 0x02 ))

if [ "${ret}" = 0 ]; then
	echo "No presence detected"
	exit 1
fi

vusb-i2cset 0x18 0xa5 0xf0 || echo "failed to issue SEARCH ROM"

reply=

for i in $(seq 1 8); do
	byte=0
	for j in $(seq 0 7); do
		vusb-i2cset 0x18 0x78 0x00 || echo "failed to send triplet"

		bit=$(vusb-i2cget 0x18 1 0xe1 0xf0)

		if [ "${bit}" -ge 80 ]; then
			byte=$((byte | (1 << j)))
		fi
		echo -n .
	done
	reply="$(printf '%02X' "${byte}")${reply}"
	echo -n +
done

echo "\n${reply}"