Added recovery guide

recovery.qmd

@@ -0,0 +1,76 @@
+---
+title: "Arduino Giga Recovery Guide"
+author:
+  - name: Hector van der Aa
+    email: hector@h3cx.dev
+    affiliation: Version 0.1.0
+date: today
+date-format: long
+format: 
+  typst:
+    mainfont: Inter
+    codefont: "JetBrains Mono" 
+    papersize: a4
+    margin:
+      x: 2cm
+      y: 2cm
+toc: true
+---
+```{=typst}
+#set page(
+  header: align(right)[
+    Version 0.1.0
+  ],
+  numbering: "1",
+)
+```
+
+```{=typst}
+#pagebreak()
+```
+
+# Background
+
+This document outlines the procedure to recover a bricked Arduino Giga R1 board.
+
+::: {.callout-important}
+This guide does **NOT** return the Arduino Giga to its factory state *(ie the ability to flash via USB with the Arduino IDE)*. However it can be applicable as a first step to a factory restore to Arduino defaults.
+:::
+
+After having does a few tests with code generated by STM32CubeMX, I once found one of my Arduinos in a seemingly dead state, no signs of life other than the power LED and a daunting error when trying to flash: `Error: Failed to initialize DAP`. After many hours of trying things, I finally managed to figure out how to recover the mcu when it has been flashed with firmware that rendered it lifeless.
+
+::: {.callout-note}
+Once the board is recovered, **CHECK** your RCC configuration in STM32CubeMX, it is likely a power configuration issue where RCC tries to power from an external SMPS when it should be set to LDO_INTERNAL
+:::
+
+# Recovery
+## Prerequisites
+In order to recover the board, you will need the following:
+
+- STM32CubeProgrammer
+- A USB-C cable
+
+## Process
+
+![Connection Mode Selection](img/recovery_1.png){width=90%}
+
+Open up STM32CubeProgrammer and set the connection mode to USB
+
+![Arduino Giga BOOT Button](img/recovery_2.png){width=80%}
+
+Then while holding down the `BOOT` button on the Arduino Giga, plug it in. Keep holding the button down for about 5 seconds then release.
+
+![Refresh and Connect Sequence](img/recovery_3.png){width=40%}
+
+Then (1) click the refresh button in STM32CubeProgrammer, you should see a USB device appear, if it doesnt, unplug your board and try the previous step again.
+
+Once the device is recognized, (2) click on connect to establish a connection to the board.
+
+![Full Chip Erase Sequence](img/recovery_4.png){width=90%}
+
+You can now proceed to a chip erase:
+1. Open the "Erasing and Programming" window
+2. Click the "Full chip erase" button, acknowledge any warnings etc
+3. Once the chip erase is complete, click disconnect
+
+**Congrats**, you have successfully unbricked your board, you should now be able to connect to it via JLink. Now good luck finding the config fluke that bricked it.