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added prototype f072 materials and new readme

Ondřej Hruška 1 year ago
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Signed by: Ondřej Hruška <ondra@ondrovo.com> GPG key ID: 2C5FD5035250423D

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+Creative Commons Attribution Share Alike
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+https://creativecommons.org/licenses/by-sa/3.0/
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README.md View File

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-# gex-hardware
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-GEX custom hardware sources and docs
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+GEX hardware
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+============
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+This repository contains source files and materials for all custom GEX hardware.
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+[CC BY SA 3.0](https://creativecommons.org/licenses/by-sa/3.0/)

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f072-hub-r.1/GEX_Dongle.PrjPCB


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+Record=TopLevelDocument|FileName=GEX_Dongle.SchDoc

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f072-hub-r.1/README.md View File

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+GEX F072 hub prototype board
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+============================
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+This board was the first custom PCB for GEX.
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+To flash a firmware, remove JP1, reset and flash using DFU. Replace JP1 and reset for normal operation.
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+Press and hold S1 to enable USB VFS with config files. Same process for locking and persisting to Flash.
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+Settings (but not system settings) can also be changed via the USB API.
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+![photo](photo.jpg)
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+Errata
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+------
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+
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+*which is an euphemnism for bugs*
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+- JP1 - bad footprint, too fine pitch. Can be fixed by soldering the header on the bottom, with slightly bent pins
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+- P1 - the SWD connector, same problem, no fix needed or available. Use DFU for flashing
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+- Missign NRESET button. Normally not needed, but often missed. You can solder it on the bottom side from one end of R2 to the GND testpoint.
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+![photo](bugfixes.jpg)

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