Commits on Apr 29, 2020

1. Add a warning about duplicate USB pullup for STM32F4 boards …

   This is suboptimal hardware design, which might need some special care
   on the software side. This noticed in the Arduino_Core_STM32, see
   stm32duino/Arduino_Core_STM32#1029
   
   For these boards, a schematic is available to confirm the resistor:
    - STM32F407VET6-STM32-F4VE-V2.0
    - STM32F407ZGT6-VCC-GND-Large
    - STM32F407VET6-VCC-GND-Small
   
   These boards have not schematic, but there is a 1.5kΩ resistor clearly
   visible in the USB data path that is almost certainly a fixed pullup:
    - STM32F407VET6-Euse-M4-DEMO-Medium
    - STM32F407VGT6-SR-Board
   
   These boards have a pullup, but it is switched by a transistor. Since
   there are also internal pullups, a warning is still in order, but using
   slightly different wording:
    - STM32F401RCT6-STM32F-Core-Board
    - STM32F407ZGT6-STM32F-Core-Board
   
   All other F4 boards have no such resistor in the schematic or visible in
   the images. Other series might also have this problem, but were not
   checked.

   

   matthijskooijman committed Apr 29, 2020
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2. Add dimensions and schematic for STM32F401RCT6-STM32F-Core-Board …

   These were taken from
   stm32duino/Arduino_Core_STM32#604. It is not
   entirely clear where they originally came from (there is an aliexpress
   link, which has an image with the dimensions but no PDF and no
   schematics).

   

   matthijskooijman committed Apr 29, 2020
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