Updated README.md with binary merge instructions

Author: MiLeG

README.md

@@ -1,37 +1,46 @@
 # Artemis Watch Firmware
 
 # Building
-To build the Artemis base firmware, you'll need the ESP-IDF. You can find the getting started 
-guide [here](https://docs.espressif.com/projects/esp-idf/en/latest/esp32/get-started/). The 
-production firmware is built using IDF version 5.1, commit [3a45d4e](https://github.com/espressif/esp-idf/tree/3a45d4e949a174e8829a2e4c86c421b030ceac5a).
+
+To build the Artemis base firmware, you'll need the ESP-IDF. You can find the getting started
+guide [here](https://docs.espressif.com/projects/esp-idf/en/latest/esp32/get-started/). The
+production firmware is built using IDF version 5.1,
+commit [3a45d4e](https://github.com/espressif/esp-idf/tree/3a45d4e949a174e8829a2e4c86c421b030ceac5a).
 
 ### ESP-IDF patching
+
 Contained in the repository is [ESP-IDF.patch](ESP-IDF.patch).
 The patch addresses [issues](https://github.com/espressif/esp-idf/issues/11690) in IDF v5.1
 related to FPU registers during context switching.
 
 For proper code functioning, apply this patch onto your ESP-IDF installation path using:
+
 ```shell
 cd /esp-idf-path/
 git apply ESP-IDF.patch
 ```
 
 Clone all submodules from the project root
+
 ```shell
 git submodule update --init --recursive
 ```
 
 ### JPEGDEC patching
+
 Contained in the repository is [JPEGDEC.patch](JPEGDEC.patch).
 Apply it onto the cloned JPEGDEC submodule:
+
 ```shell
 cd components/JPEGDEC
 git apply ../../JPEGDEC.patch
 ```
 
 ### LovyanGFX patching
+
 Contained in the repository is [LovyanGFX.patch](LovyanGFX.patch).
 Apply it onto the cloned LovyanGFX submodule:
+
 ```shell
 cd components/LovyanGFX
 git apply ../../LovyanGFX.patch
@@ -41,16 +50,35 @@ After patching everything, in the root directory of the project:
 
 **To build the firmware** run ```idf.py build```
 
-**To upload the firmware to the device** run ```idf.py -p <PORT> flash```. Replace `<PORT>` with 
+**To upload the firmware to the device** run ```idf.py -p <PORT> flash```. Replace `<PORT>` with
 the port Artemis is attached to, for ex. ```COM6``` or ```/dev/ttyACM0```.
 
+### Merging a single binary file
+
+After building (or flashing) the firmware, you can merge the resulting files into a single
+binary file. This is useful for sharing a build or flashing it directly onto the board.
+
+The necessary tool for this is [esptool](https://github.com/espressif/esptool), which comes
+preinstalled with ESP-IDF
+
+From the project root go into your build folder (usually just /build):
+
+```shell
+cd build
+esptool --chip esp32s3 merge_bin --fill-flash-size 4MB -o ../Artemis.bin --flash_mode dio 
+--flash_freq 80m --flash_size 4MB 0x0 bootloader/bootloader.bin 0x10000 Artemis-Firmware.bin 0x8000 partition_table/partition-table.bin 0x2f6000 storage.bin
+```
+
 # Restoring the stock firmware
-To restore the stock firmware, you can download the prebuilt binary on the [releases page](https://github.com/CircuitMess/GC_Artemis-Firmware/releases) of this repository 
+
+To restore the stock firmware, you can download the prebuilt binary on
+the [releases page](https://github.com/CircuitMess/GC_Artemis-Firmware/releases) of this repository
 and flash it manually using esptool:
+
 ```shell
 esptool -c esp32s3 -b 921600 -p <PORT> write_flash 0 Artemis-Firmware.bin
 ```
 
-Alternatively, you can also do so using [CircuitBlocks](https://code.circuitmess.com/) by 
-logging in, clicking the "Restore Firmware" button in the top-right corner, and following the 
+Alternatively, you can also do so using [CircuitBlocks](https://code.circuitmess.com/) by
+logging in, clicking the "Restore Firmware" button in the top-right corner, and following the
 on-screen instructions.