patch-airsense

#!/bin/bash

die() { echo >&2 "$*" ; exit 1 ; }	

IN=$1
OUT=$2

if [ -z "$IN" -o -z "$OUT" ]; then
		die "Usage: $0: stm32.bin stm32-unlocked.bin"
fi


if [ ! -r "$IN" ]; then
		die "$IN: can not open input file"
fi

patch() {
	offset=`printf "%d" $1`
	printf "patching %08x\n" $1
	dd bs=1 seek=$offset conv=notrunc of="$OUT" status=none
}

shasum=$( sha256sum $IN | cut -f 1 -d " " )
if [ $shasum = "533b91127aa22e05b933db203ad56c449dc12a8c3fd62f57bd88c472a8061775" ]; then
	version="401"
elif [ $shasum = "363a204ba217f31223e929365d58b8f5ce038a7681e362fe157e190c2eacbd30" ]; then
	version="306"
else
	die "$IN: incompatible firmware version."
fi
echo "Found firmware version: $version"

cp "$IN" "$OUT" || die "$OUT: copy failed"

# also patch up the jump instruction that checks for tamper
printf '\xc0\x46' | patch 0xf0 \
|| die "startup patch failed" \

# and add a message so that we know this is a modified firmware
printf 'HACKED!' | patch 0x17500 || die failed
printf 'NOT FOR USE\x0' | patch 0x1a540 || die failed
printf 'WARNING! WARNING! Ventilator test firmware: Not for humans!\x00' | patch 0x1b860 || die failed

BUILD_FLAGS=0

patch_code() {
	#if you want to add the extra breath mode
	BUILD_FLAGS=$(( BUILD_FLAGS | (1 << 0) ))
	if [ -r breath.bin ] && [ $version = "401" ] ; then
		echo "Including breath.bin"
		cat breath.bin | patch 0xbb734 || die "binary patch failed"
	elif [ -r breath.bin ] && [ $version = "306" ] ; then
                echo "Including breath.bin"
                cat breath.bin | patch 0xbb4d4 || die "binary patch failed"
	else
		die "breath.bin not found, did you run make?"
	fi 

	if [ -r graph.bin ]; then
		echo "Including graph.bin"
		cat graph.bin | patch 0xfd000 || die "graph patch failed"
		printf '\x01\xd0\x0f\x08' | patch 0xf9c88 || die "graph fixup failed"
	fi
}

unlock_ui_limits() {
	BUILD_FLAGS=$(( BUILD_FLAGS | (1 << 1) ))
	# patch UI limits to range between 1 and 30
	printf '\xdc\x05\x00\x00\x32\x00' | patch 0x4fa8 || die failed
	printf '\xdc\x05\x00\x00\x32\x00' | patch 0x4fc4 || die failed
	printf '\xdc\x05\x00\x00\x32\x00' | patch 0x7eb0 || die failed
	printf '\xdc\x05\x00\x00\x32\x00' | patch 0x7ee8 || die failed
	printf '\xdc\x05\x00\x00\x32\x00' | patch 0x7ecc || die failed
}


extra_debug() {
	BUILD_FLAGS=$(( BUILD_FLAGS | (1 << 2) ))
	# set config variable 0xc value to 4 == enable more debugging data on display
	# if you set it to \x0f it will enable four separate display pages of info in sleep report mode
	printf '\x04' | patch 0x84a8 || die failed
}

extra_modes() {
	BUILD_FLAGS=$(( BUILD_FLAGS | (1 << 3) ))
	# add more mode entries, set config 0x0 mask to all bits high
	# default is 0x3, which only enables mode 1 (CPAP) and 2 (AutoSet)
	# ---> This is the real magic <---
	printf '\xff\xff' | patch 0x8590 || die failed
}

extra_menu() {
	BUILD_FLAGS=$(( BUILD_FLAGS | (1 << 4) ))
	# try enabling extra menu items
	printf '\x01\x20' | patch 0x66470
}

# If you want all menu items to always be visible, let this section run
all_menu() {
	BUILD_FLAGS=$(( BUILD_FLAGS | (1 << 5) ))
	# force status bit 5 always on -- always editable
	printf '\x01\x20' | patch 0x6e502
	# force status bit 4 always on -- this makes all the inputs show up, regardless of mode
	printf '\x01\x20' | patch 0x6e4c4
}

gui_config () {
	BUILD_FLAGS=$(( BUILD_FLAGS | (1 << 6) ))
	# enable all of the editable options in the settings menu
	# by turning on bit 1 of the config entries.  All of these variables
	# are listed in the gui_create_menus function
	GUI_CONFIG=0x4ef4
	GUI_CONFIG_SIZE=0x1c
	GUI_CONFIG_OFFSET=30

	for var in \
		0x2f 0x1ec 0x1ed 0x24 0x25 0x1d3 0x1d6 0x1d5 0x1d7 0x26 \
		0x1d9 0x1e0 0x1e1 0x1e2 0x1e5 0x1e4 0x1e6 0x1e7 0x1e9 0x1ea 0x1eb \
	; do
		# set config byte 0 bit 0, 1 and 2, which makes it active
		ADDR=`perl -e "printf '%d', $GUI_CONFIG + ($var - $GUI_CONFIG_OFFSET) * $GUI_CONFIG_SIZE"`
		printf '\x07\x00' | patch $ADDR
	done
}

patch_code
unlock_ui_limits
extra_debug
extra_modes
extra_menu
#all_menu
gui_config

FLAGSTR=$(printf 'FLAGS=0x%02x' $BUILD_FLAGS)
printf $FLAGSTR | patch 0x17588

COMMIT_HASH=$(git log -n1 --format=format:"%H" | head -c 7)
printf 'GIT=%s\x00' $COMMIT_HASH | patch 0x17764

sha256sum $OUT