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-.. _errata:
-
-========
- Errata
-========
-
-This page is a collection of known issues and warnings for each
-revision of the Maple board. The failure modes aren't design errors,
-but are easy ways to break or damage your board permanently. For a
-list of differences between the Maple and Arduinos, see the
-:ref:`compatibility reference <compatibility>`.
-
-The errata are grouped by Maple version ("Rev").  Rev 5 is currently
-on sale.  If you are unsure which version you own, the :ref:`Maple
-hardware page <maple-hardware-identify-rev>` has pictures and
-descriptions of each version.
-
-.. contents:: Contents
-   :local:
-
-Maple Rev 5
------------
-
-Known issues:
-
-* **Pin 3 AIN missing**: Pin 3 is capable of analog input, but the
-  corresponding "AIN" is missing from its silkscreen.
-
-* **GPIO 39-43 not configured**: this is really more of a software
-  "TODO" item.  Some of the JTAG header pins are numbered 39-43. These
-  STM32 pins are indeed fully functional :ref:`GPIO <gpio>` when a
-  :ref:`JTAG <jtag>` device is not connected, but we have not enabled
-  them in software and thus they can not be accessed with the regular
-  :ref:`lang-pinmode` or :ref:`lang-digitalwrite` functions.
-
-Potential failure modes:
-
-* **High voltage on non-tolerant pins**: not all header pins are 5V
-  compatible; so e.g. connecting certain serial devices in the wrong
-  way could over-voltage the pins.  The :ref:`Pin-Mapping Mega Table
-  <pin-mapping-mega-table>` details which pins are 5V-tolerant.
-
-Maple Rev 3
------------
-
-Known issues:
-
-* **Bad/Sticky Buttons**: a number of Rev 3 boards sold in May-June 2010
-  have questionable RESET and BUT buttons.
-
-  What seems to have happened is that the flux remover we used to
-  clean the boards before shipping eroded the plastic internals, which
-  resulted in intermittent functionality. All buttons on all shipped
-  boards did function in testing, but some may have been unreliable in
-  regular use.
-
-  If you have this problem, we will be happy to ship you new buttons
-  if you think you can re-solder them yourself, or you can ship us
-  your board and we will swap out that part.
-
-  For reference, the button part number is KMR211GLFS and the flux
-  remover we used is "Precision Electronics Cleaner" from RadioShack,
-  which is "Safe on most plastics" and contains Dipropylene glycol
-  monomethyl ether, hydrotreated heavy naphtha, dipropylene glycol
-  methyl ether acetate (really?), and carbon dioxide.
-
-* **Resistors on pins 0 and 1**: these header pins, which are RX/TX on
-  USART2 (:ref:`Serial2 <lang-serial>`), have resistors in-line
-  between the STM32 and the headers. These resistors increase the
-  impedance of the lines for ADC reads and affect the open drain GPIO
-  functionality of the pins.
-
-  These resistors were accidentally copied over from older Arduino USB
-  designs, where they appear to protect the USB-Serial converter from
-  TTL voltage on the headers.
-
-* **GPIO 39-43 not configured**: this is really more of a software
-  "TODO" item.  Some of the JTAG header pins are numbered 39-43. These
-  STM32 pins are indeed fully functional :ref:`GPIO <gpio>` when the a
-  :ref:`JTAG <jtag>` device is not connected, but we have not enabled
-  them in software and thus they can not be accessed with the regular
-  :ref:`lang-pinmode` or :ref:`lang-digitalwrite` functions.
-
-* **Silkscreen Errors**: the silkscreen on the bottom indicated PWM
-  functionality on pin 25 and listen the external header GND pin as
-  number 38 (actually 38 is connected to the BUT button). We manually
-  sharpied over both of these mistakes.
-
-* **PWM Marketing Mistake**: We originally sold the Maple advertising
-  22 channels of 16-bit hardware PWM; actually the Maple only has 15.
-
-Potential failure modes:
-
-* **TTL voltage on non-tolerant pins**: not all header pins are 5V
-  compatible; connecting certain serial devices in the wrong way could
-  over voltage the pins.  The :ref:`Pin-Mapping Mega Table
-  <pin-mapping-mega-table>` details which pins are 5V-tolerant.
-
-Maple Rev 1
------------
-
-Known issues:
-
-* **ADC noise**: generally very high, in particular when the USB port
-  is being used for communications (including keep-alive pings when
-  connected to a computer).
-
-  This issue was resolved in Rev 3 with a 4-layer design and a
-  geometrically isolated ADC V\ :sub:`ref` plane.
-
-* **Resistors on pins 0 and 1**: these header pins, which are RX/TX on
-  USART2 (:ref:`Serial2 <lang-serial>`), have resistors in-line
-  between the STM32 and the headers. These resistors increase the
-  impedance of the lines for ADC reads and affect the open drain GPIO
-  functionality of the pins.
-
-  These resistors were accidentally copied over from older Arduino USB
-  designs, where they appear to protect the USB-Serial converter from
-  TTL voltage on the headers.
-
-* **Silkscreen Differences**: the pin numbering scheme on Rev 1 is
-  different from Rev 3, and thus Rev 3 software is difficult to use
-  with Rev 1 boards. Notably, the analog input bank is labeled A0-A4
-  on Rev 1 but 15-20 on Rev 3, and the extra header bank does not have
-  a pinout table on the bottom.
-
-* **No BUT Button**: the BUT button, useful for serial bootloading,
-  was only added in Rev 3. As a workaround, you can directly short the
-  appropriate MCU pin to Vcc; see `this forum posting
-  <http://forums.leaflabs.com/topic.php?id=32#post-126>`_.
-
-* **PWM Marketing Mistake**: We originally sold the Maple advertising
-  22 channels of 16-bit hardware PWM; actually the Maple only has 15.
-
-Potential failure modes:
-
-* **TTL voltage on non-tolerant pins**: not all header pins are 5v
-  compatible; connecting certain serial devices in the wrong way could
-  over voltage the pins. The :ref:`Pin-Mapping Mega Table
-  <pin-mapping-mega-table>` details which pins are 5V-tolerant.