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====== wCoreF4 ======

===== Introduction =====

This is a cross-grade of the STM32F4 Core based on the [[http://www.waveshare.com/wiki/Core407V|Core407v]] breakout board from Waveshare. There are other versions of MCU breakouts, but the Waveshare one seems quite a reputable source with decent distribution and documentation.

==== Pros ====
  * Slightly smaller footprint
  * (Almost) all connectors on same face
  * Proper USB A and B ports
  * Footswitch/gate 3.5mm jack
  * Hardware host/slave switch
  * LEDs on the panel
  * Reset button on the panel
  * User button on header
  * More mounting options available (e.g. panel mount including USB)
  * 1A 3v3 regulator
  * Possibility for external Vref (for AIN)

==== Cons ====
  * Similar height to Disco version (could cut off headers etc.)
  * Lacks ST-LINK and requires a (cheap) programmer or a Discovery module
  * No mounting holes on MCU breakout
  * Requires SMT soldering (wide pitch)

===== Sub parts =====

The Core is split over three PCBs:

  * [[wCoreF4 PCB]]
  * [[wCore USB]]
  * [[wCore RES-SD]]

The MIDI interfaces were also redesigned:

  * [[wCore MIDI8]]
  * [[wCore I2C]]

Build instructions are found on the appropriate pages.

===== MCU module =====

The actual MCU module is available from several sources:

  * [[https://eckstein-shop.de/Core407V]]
  * [[http://www.waveshare.com/core407v.htm]]
  * [[http://www.ebay.com/itm/Core407V-STM32F407VET6-STM32-ARM-Cortex-M4-Development-Board-Full-I-O-Expander-/261045971937?hash=item3cc78d6be1:m:mp6HjVptDe-JUZfdAfbgOvg|eBay]]

===== Burning the bootloader =====

The MCU module has a USB port, but direct programming would only be possible with a USB-UART programmer. It would also require a different bootloader protocol. Instead, we make use of ST-LINK-like functionality. The MCU module has a typical JTAG header and these pins are also available on the two 2*25 header rows. So even if the header had to be removed for space reasons, it should always be possible to re-flash the MCU.

==== Option 1: ST-LINK clone ====

These are readily available from eBay and other sellers for typically <$10. You only require one programmer to flash as many modules as needed. 

==== Option 2: use a Discovery module ====

The Discovery module (even if connected to a MIDIbox Core) can be used for programming. To do so, remove the two jumpers labelled ST-LINK/DISCOVERY. This connects the SWD interface from the STM32F4 MCU on the Discovery board:

{{:wcore:discojumpers.png?nolink&300|}}

==== Flashing over SWD ====

The following five connections should be made with DuPont cables:

  * 3v3
  * 0V/ground
  * DIO
  * CLK
  * RESET

{{::wcore:flashing.png?nolink&600|}} 


After that, [[http://www.ucapps.de/mbhp_core_stm32f4.html|follow the instructions]] for the initial flash of a Discovery module.




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==== License ====

Currently the design is (c) 2017 antilog devices with all rights reserved; all documentation is CC BY-NC-SA 3.0.
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