arduino-mega-header

Description

GPIO pins exposed on Arduino Mega (rev3) headers

The Arduino Mega layout provides six headers, three each along
opposite edges of the board.

Proceeding counter-clockwise:
* An 8-pin Power Supply header. No pins on this header are exposed
  by this binding.
* An 8-pin Analog Input header. This has analog input signals
  labeled from A0 at the top through A7 at the bottom.
* Another 8-pin Analog Input header. This has eight additional analog
  input signals labeled from A8 at the top through A15 at the bottom.

* An 8-pin header (opposite the second Analog Input header). This has
  digital input signals labeled in decreasing order from D21 at the bottom
  to D14 at the top.
* Another 8-pin header (opposite the first Analog Input header). This has
  digital input signals labeled from D0 at the bottom to D7 at the top.
* A 10-pin header (opposite Power Supply). This has six additional
  digital input signals labelled from D8 at the bottom through D13
  towards the top, skipping two pins (GND and AREF), then finishing with
  SDA1 and SCL1 at the top.

This binding provides a nexus mapping for 40 pins, extending the mapping of
the Arduino Uno (R3) header.

The pins overlapping between Arduino Mega and Arduino Uno have the following
parent pin mapping:
* Parent pins 0 through 5 correspond to A0 through A5.
* Parent pins 6 through 19 correspond to D0 through D13.
* Parent pins 20 and 21 correspond to SDA1 and SCL1.

The additional pins of Arduino Mega have the following parent pin mapping:
* Parent pins 22 through 27 correspond to D14 through D19.
* Parent pins 28 and 29 correspond to D20 and D21.
* Parent pins 30 and 31 correspond to A6 and A7.
* Parent pins 32 through 39 correspond to A8 through A15.

The parent pin mapping and their physical layout are depicted below:

                             SCL1 21
                             SDA1 20
                             AREF -
                             GND  -
    - N/C                    D13  19
    - IOREF                  D12  18
    - RESET                  D11  17
    - 3V3                    D10  16
    - 5V                     D9   15
    - GND                    D8   14
    - GND
    - VIN                    D7   13
                             D6   12
    0  A0                    D5   11
    1  A1                    D4   10
    2  A2                    D3    9
    3  A3                    D2    8
    4  A4                    D1    7
    5  A5                    D0    6
    30 A6
    31 A7                    D14  22
                             D15  23
    32 A8                    D16  24
    33 A9                    D17  25
    34 A10                   D18  26
    35 A11                   D19  27
    36 A12                   D20  28
    37 A13                   D21  29
    38 A14
    39 A15

Use ARDUINO_MEGA_HEADER_* constants in <zephyr/dt-bindings/gpio/arduino-mega-header.h>
to refer to specific pins using convenient constant names.

Properties

Properties not inherited from the base binding file.

Name

Type

Details

gpio-map

compound

This property is required.

gpio-map-mask

array

gpio-map-pass-thru

array

#gpio-cells

int

 
Number of items to expect in a GPIO specifier

This property is required.