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docs: Minor rewording of Marlin pin number section of FAQ 

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Kevin O'Connor 2018-08-26 10:09:08 -04:00
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1 changed files with 13 additions and 13 deletions
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26
docs/FAQ.md
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@ -266,10 +266,10 @@ details.
### How do I convert a Marlin pin number to a Klipper pin name?
Short answer: There isn't an easy way to do that reliably. In some
cases one can use Klipper's `pin_map: arduino` feature. Otherwise, for
"digital" pins, one method is to search for the requested pin in
Marlin's fastio header files. The Atmega2560 and Atmega1280 chips use
Short answer: In some cases one can use Klipper's `pin_map: arduino`
feature. Otherwise, for "digital" pins, one method is to search for
the requested pin in Marlin's fastio header files. The Atmega2560 and
Atmega1280 chips use
[fastio_1280.h](https://github.com/MarlinFirmware/Marlin/blob/1.1.9/Marlin/fastio_1280.h),
while the Atmega644p and Atmega1284p chips use
[fastio_644.h](https://github.com/MarlinFirmware/Marlin/blob/1.1.9/Marlin/fastio_644.h).
@ -288,12 +288,12 @@ micro-controller. On the Atmega chips these hardware pins have names
like `PA4`, `PC7`, or `PD2`.
Long ago, the Arduino project decided to avoid using the standard
hardware names in favor of pin names based on incrementing numbers -
these Arduino names generally look like `D23` or `A14`. This was an
unfortunate choice that has lead to great deal of confusion. In
particular the Arduino pin numbers frequently don't translate to the
same hardware names. For example, `D21` is `PD0` on one common Arduino
board, but is `PC7` on another common Arduino board.
hardware names in favor of their own pin names based on incrementing
numbers - these Arduino names generally look like `D23` or `A14`. This
was an unfortunate choice that has lead to a great deal of confusion.
In particular the Arduino pin numbers frequently don't translate to
the same hardware names. For example, `D21` is `PD0` on one common
Arduino board, but is `PC7` on another common Arduino board.
In order to support 3d printers based on real Arduino boards, Klipper
supports the Arduino pin aliases. This feature is enabled by adding
@ -308,9 +308,9 @@ Marlin primarily follows the Arduino pin numbering scheme. However,
Marlin supports a few chips that Arduino does not support and in some
cases it supports pins that Arduino boards do not expose. In these
cases, Marlin chose their own pin numbering scheme. Klipper does not
support these custom pin numbers - see the "short answer" section
above for information on translating these pin numbers to their
standard hardware names.
support these custom pin numbers - check Marlin's fastio headers (see
above) to translate these pin numbers to their standard hardware
names.
### How do I upgrade to the latest software?