aggregate_bin.sh

#!/usr/bin/env bash

set -e

# Packages the 4 binaries into a single .bin for address 0x0000 as per the list below. Inspired by
# https://github.com/marcelstoer/docker-nodemcu-build/blob/master/build-esp32#L85
#
# 0x1000    bootloader 
# 0x8000    partitions 
# 0xe000    boot_app0
# 0x10000   firmware
# -> https://gitter.im/espressif/arduino-esp32?at=5c9395c0dfc69a1454cf3323 -> "probably boot_app0.bin is a stub for OTA that tells it that app0 is the active partition."
#
# srec_cat doesn't like relative file paths (current version on macOS) -> build absolute ones

home_dir=$(echo ~)
current_dir=$(pwd)
build_dir="$current_dir/.pio/build/device-test"

bootloader="$build_dir/bootloader.bin"
partitions="$build_dir/partitions.bin"
boot_app="$home_dir/.platformio/packages/framework-arduinoespressif32/tools/partitions/boot_app0.bin"
esptool="$home_dir/.platformio/packages/tool-esptoolpy/esptool.py"
firmware="$build_dir/firmware.bin"
app="$build_dir/app-firmware.bin"
 
echo "Aggregating binaries." 
echo "App: $app"
echo "Bootloader: $bootloader"
echo "Partitions: $partitions"
echo "Boot App: $boot_app"
echo "Firmware: $firmware"
echo "Esptool: $esptool"
echo "Home: $home_dir"
#srec_cat -output "$app" -binary "$bootloader" -binary -offset 0x1000 -fill 0xff 0x0000 0x8000 "$partitions" -binary -offset 0x8000 -fill 0xff 0x8000 0xe000 "$boot_app" -binary -offset 0xe000 -fill 0xff 0xe000 0x10000 "$firmware" -binary -offset 0x10000
python3 $esptool --chip ESP32-S3 merge_bin -o "$app" --flash_mode dio --flash_size 4MB 0x0000 "$bootloader" 0x8000 "$partitions" 0x10000 "$firmware"
echo "Done, created '$app'."