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docs/samd: Add documentation for the samd port. 

Includes a general overview, a quickref, pinout tables, and the beginnings
of a tutorial.
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robert-hh 2 years ago
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unix/quickref.rst
zephyr/quickref.rst
renesas-ra/quickref.rst
samd/quickref.rst

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.. _samd_general:
General information about the SAMD port
=======================================
The SAMD21/SAMD51 MCU family is a high performance family of devices made by MicroChip.
The SAMD21 devices are based on an ARM M0+ core, the SAMD51 device on ARM Cortex M4 core.
They provide many on-chip I/O units for building small to medium sized devices.
Multitude of boards
-------------------
There is a multitude of modules and boards from different sources which carry
an SAMD21/SAMD51 chip. MicroPython aims to provide a generic port which runs on
as many boards/modules as possible, but there may be limitations. The
Adafruit ItsyBitsy M0 Express, Adafruit Feather M4 Express and the Adafruit ItsyBitsy M4 Express
development boards are taken as reference for the port (for example, testing is performed on them).
For any board you are using please make sure you have a data sheet, schematics
and other reference materials so you can look up any board-specific functions.
The following boards are at the moment supported by the port:
- ADAFRUIT FEATHER M0 EXPRESS
- ADAFRUIT FEATHER M4 EXPRESS
- ADAFRUIT ITSYBITSY M0 EXPRESS
- ADAFRUIT ITSYBITSY M4 EXPRESS
- ADAFRUIT TRINKET M0
- MINISAM M4
- SAMD21 XPLAINED PRO
- SEEED WIO TERMINAL
- SEEED XIAO
To make a generic SAMD port and support as many boards as possible the
following design and implementation decision were made:
* GPIO pin numbering is based on the board numbering.
Please have the manual/pin diagram of your board at hand
to find correspondence between your board pins and actual SAMD21/SAMD51 pins.
For the boards listed above, the relation between the board pin number and
the GPIO number can be found at :ref:`samd_pinout`.
* The pins that can be used by MicroPython are limited to those listed
in the board definition files.
Technical specifications and SoC data sheets
--------------------------------------------
The data sheets and other reference material for SAMD21/SAMD51 chip are available
from the vendor site: https://www.microchip.com/en-us/products/microcontrollers-and-microprocessors/32-bit-mcus/sam-32-bit-mcus
They are the primary reference for the chip technical specifications, capabilities,
operating modes, internal functioning, etc.
For your convenience, a few technical specifications are provided below:
SAMD21:
* Architecture: ARM Cortex M0+
* CPU frequency: up to 48MHz
* Total RAM available: up to 32 kB (see table)
* Internal FlashROM: up to 256 kB
Some boards provide additional external SPI flash.
* GPIO: up to 52 (GPIOs are multiplexed with other functions, including
external FlashROM, UART, etc.)
* UART: up to 6 serial devices, which can used for UART, SPI or I2C.
* I2S: 1 I2S interfaces
* ADC: One 12-bit SAR ADC converter with 16 channels.
* Programming: using BootROM bootloader from USB.
SAMD51:
* Architecture: ARM Cortex M4
* CPU frequency: up to 120MHz
* Total RAM available: up to 256 kB
* Internal FlashROM: up to 1 MB
Some boards provide additional external SPI flash.
* GPIO: up to 99 (GPIOs are multiplexed with other functions, including
external FlashROM, UART, etc.)
* UART: up to 8 serial devices, which can used for UART, SPI or I2C.
* I2S: 1 I2S interfaces
* ADC: Dual 12-bit SAR ADC converter with 16 channels.
* Programming: using BootROM bootloader from USB.
For more information see the excellent SAMD21/SAMD51 data sheets or reference manuals.
At the moment, the SAM21 port of MicroPython requires 256kB flash, of which 64kB is used
for a small file system. The SAM51 port requires 512 kB of flash, of which all flash beyond
384kB is used for a file system. Some boards have additional flash memory, which can be used
as additional file space.

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.. _samd_pinout:
Pinout for the SAMD machine modules
===================================
The assignment of device functions to pins is very flexible. The same function may be used
at different pins. The representation of the assignment choices are given by a table,
which is a subset of the MCU's Pin MUX table and is specific to each board, as the
available pin set varies. The structure of the table is the same for each board, but
the set of rows is different.
.. _samd21_pinout_table:
Adafruit ItsyBitsy M0 Express pin assignment table
--------------------------------------------------
=== ==== ============ ==== ==== ====== ====== ====== ======
Pin GPIO Pin name IRQ ADC Serial Serial TCC/TC TCC/TC
=== ==== ============ ==== ==== ====== ====== ====== ======
0 PA11 D0 11 19 0/3 2/3 1/1 0/3
1 PA10 D1 10 18 0/2 2/2 1/0 0/2
2 PA14 D2 14 - 2/2 4/2 3/0 0/4
3 PA09 D3 9 17 0/1 2/1 0/1 1/3
4 PA08 D4 - 16 0/0 2/0 0/0 1/2
5 PA15 D5 15 - 2/3 4/3 3/1 0/5
7 PA21 D7 5 - 5/3 3/3 7/1 0/7
9 PA07 D9 7 7 - 0/3 1/1 -
10 PA18 D10 2 - 1/2 3/2 3/0 0/2
11 PA16 D11 0 - 1/0 3/0 2/0 0/6
12 PA19 D12 3 - 1/3 3/3 3/1 0/3
13 PA17 D13 1 - 1/1 3/1 2/1 0/7
14 PA02 A0 2 0 - - - -
15 PB08 A1 8 2 - 4/0 4/0 -
16 PB09 A2 9 3 - 4/1 4/1 -
17 PA04 A3 4 4 - 0/0 0/0 -
18 PA05 A4 5 5 - 0/1 0/1 -
19 PB02 A5 2 - - 5/0 6/0 -
20 PA22 SDA 6 - 3/0 5/0 4/0 0/4
21 PA23 SCL 7 - 3/1 5/1 4/1 0/5
22 PB10 MOSI 10 - - 4/2 5/0 0/4
23 PA12 MISO 12 - 2/0 4/0 2/0 0/6
24 PB11 SCK 11 - - 4/3 5/1 0/5
25 PA00 DOTSTAR_CLK 0 - - 1/0 2/0 -
26 PA01 DOTSTAR_DATA 1 - - 1/1 2/1 -
27 PB22 FLASH_MOSI 6 - - 5/2 7/0 -
28 PB03 FLASH_MISO 3 - - 5/1 6/1 -
29 PB23 FLASH_SCK 7 - - 5/3 7/1 -
=== ==== ============ ==== ==== ====== ====== ====== ======
Description of the columns:
- *Pin* - The number that is expected at ``machine.Pin(n)``, if the pin is given
as a number. This is NOT the GPIO number, but the board pin number, as
given in the board specific definition file.
- *GPIO* - The GPIO number.
- *Pin Name* - The name of a Pin which is expected argument to ``machine.Pin("name")``.
- *IRQ* - The IRQ number assigned to that GPIO, used internally by ``Pin.irq()``. When
using ``Pin.irq()``, different pins must use different IRQs
- *ADC* - The ADC channel assigned to the pin. When using ADC, different pins must
not use the same ADC channel.
- *Serial* - Two columns with optional Serial signal assignments. Both may be used.
The cell content is device #/pad #. The pad # is the respective internal
signal of that serial device. Details below.
- *TCC/TC* - Two columns with assignments of the TCC modules for PWM.
The cell content is device #/output #. For PWM, devices 0, 1, and 2
are used. The TC device pair 3/4 is used for ``ticks_us()``.
SAMD21 UART assignments
```````````````````````
The UART devices and signals must be chosen according to the following rules:
- The TX signal must be at a Pin with pad numbers 2 or 0, like Pin 1 with serial
device 0 or 2.
- The RX pin may be assigned to one of the other pads.
Examples for Adafruit ItsyBitsy M0 Express:
- uart 0 at pins 0/1 This is the default UART at the RX/TX labelled pins
- uart 1 at pins 12/10
- uart 2 at pins 0/1
- uart 3 at pins 11/13
- uart 4 at pins 2/5
- uart 5 at pins SCL/SDA
or other combinations.
SAMD21 I2C assignments
``````````````````````
The I2C devices and signals must be chosen according to the following rules:
- The SDA signal must be at a Pin with pad numbers 0.
- The SCL signal must be at a Pin with pad numbers 1.
Examples for Adafruit ItsyBitsy M0 Express:
- I2C 0 at Pin A3/A4
- I2C 1 at pins 11/13
- I2C 2 at the pins 4/3
- I2C 3 at the pins SDA/SCL This is the default I2C device at the SDA/SCl labelled pin
- I2C 4 at the pins A1/A2
- I2C 5 at the pins SDA/SCL,
or other combinations.
SAMD21 SPI assignments
``````````````````````
The I2C devices and signals must be chosen according to the following rules:
- The following pad number pairs are suitable for MOSI/SCK: 0/1, 2/3, 3/1, and 0/3.
- The MISO signal must be at a Pin with a different pad number than MOSI or SCK.
Examples for Adafruit ItsyBitsy M0 Express:
- SPI 0 at pins 0/4/1
- SPI 1 at pins 11/12/13
- SPI 2 at pins 0/4/1
- SPI 3 at pins 11/12/13
- SPI 4 at Pin MOSI/MISO/SCK This is the default SPI device at the MOSI/MISO/SCK labelled pins.
or other combinations.
SAMD21 PWM assignments
``````````````````````
The TCC/TC device numbers 0, 1 and 2 can be used for PWM. Device 0 has four
channels, device 1 and 2 have two channels. So in total 3 different PWM
frequencies can be used, and 8 different duty cycle values.
The DAC output for the Adafruit ItsyBitsy M0 Express board is available at the pin A0.
.. _samd51_pinout_table:
Adafruit ItsyBitsy M4 Express pin assignment table
--------------------------------------------------
=== ==== ============ ==== ==== ==== ====== ====== ===== ===== =====
Pin GPIO Pin name IRQ ADC ADC Serial Serial TC PWM PWM
=== ==== ============ ==== ==== ==== ====== ====== ===== ===== =====
2 PA02 A0 2 0 - - - - - -
5 PA05 A1 5 5 - - 0/1 0/1 - -
40 PB08 A2 8 2 0 - 4/0 4/0 - -
41 PB09 A3 9 3 1 - 4/1 4/1 - -
4 PA04 A4 4 4 - - 0/0 0/0 - -
6 PA06 A5 6 6 - - 0/2 1/0 - -
16 PA16 D0 0 - - 1/0 3/1 2/0 1/0 0/4
17 PA17 D1 1 - - 1/1 3/0 2/1 1/1 0/5
7 PA07 D2 7 7 - - 0/3 1/1 - -
54 PB22 D3 22 - - 1/2 5/2 7/0 - -
14 PA14 D4 14 - - 2/2 4/2 3/0 2/0 1/2
15 PA15 D5 15 - - 2/3 4/3 3/1 2/1 1/3
18 PA18 D7 2 - - 1/2 3/2 3/0 1/2 0/6
19 PA19 D9 3 - - 1/3 3/3 3/1 1/3 0/7
20 PA20 D10 4 - - 5/2 3/2 7/0 1/4 0/0
21 PA21 D11 5 - - 5/3 3/3 7/1 1/5 0/1
23 PA23 D12 7 - - 3/1 5/0 4/1 1/7 0/3
22 PA22 D13 6 - - 3/0 5/1 4/0 1/6 0/2
34 PB02 DOTSTAR_CLK 2 14 - - 5/0 6/0 2/2 -
35 PB03 DOTSTAR_DATA 9 15 - - 5/1 6/1 - -
43 PB11 FLASH_CS 12 - - - 4/3 5/1 0/5 1/1
11 PA11 FLASH_HOLD 11 11 - 0/3 2/3 1/1 0/3 1/7
9 PA09 FLASH_MISO 9 9 3 0/1 2/0 0/1 0/1 1/5
8 PA08 FLASH_MOSI - 8 2 0/0 2/1 0/0 0/0 1/4
42 PB10 FLASH_SCK 10 - - - 4/2 5/0 0/4 1/0
10 PA10 FLASH_WP 10 10 - 0/2 2/2 1/0 0/2 1/6
55 PB23 MISO 7 - - 1/3 5/3 7/1 - -
0 PA00 MOSI 0 - - - 1/0 2/0 - -
1 PA01 SCK 1 - - - 1/1 2/1 - -
13 PA13 SCL 13 - - 2/1 4/0 2/1 0/7 1/3
12 PA12 SDA 12 - - 2/0 4/1 2/0 0/6 1/2
30 PA30 SWCLK 14 - - 7/2 1/2 6/0 2/0 -
31 PA31 SWDIO 15 - - 7/3 1/3 6/1 2/1 -
24 PA24 USB_DM 8 - - 3/2 5/2 5/0 2/2 -
25 PA25 USB_DP 9 - - 3/3 5/3 5/1 - -
3 PA03 - 3 10 - - - - - -
27 PA27 - 11 - - - - - - -
=== ==== ============ ==== ==== ==== ====== ====== ===== ===== =====
Description of the columns:
- *Pin* - The number that is expected at ``machine.Pin(n)``, if the pin is given
as a number. This is NOT the GPIO number, but the board pin number, as
given in the board specific definition file.
- *GPIO* - The GPIO number.
- *Pin Name* The name of a Pin which is expected argument to ``machine.Pin("name")``.
- *IRQ* - The IRQ number assigned to that GPIO, used internally by ``Pin.irq()``. When
using ``Pin.irq()``, different pins must use different IRQs
- *ADC* - The ADC0/1 channel assigned to the pin. When using ADC, different pins must
not use the same ADC device and channel.
- *Serial* - Two columns with optional Serial signal assignments. Both may be used.
The cell content is device #/pad #. The pad # is the respective internal
signal of that serial device. Details below.
- *TC* - These device are currently not assigned to Pin. the TC device pair 0/1
is used for ``ticks_us()``.
- *PWM* - Two columns with assignments of the TCC modules for PWM
The cell content is device #/output #. Details below.
SAMD51 UART assignments
```````````````````````
The UART devices and signals must be chosen according to the following rules:
- The TX signal must be at a Pin with pad numbers 0, like Pin 1 with serial
device 3.
- The RX pin may be assigned to one of the other pads.
Examples for Adafruit ItsyBitsy 4 Express:
- uart 0 at pins A4/A1
- uart 1 at pins 1/0 This is the default UART at the RX/TX labelled pins
- uart 2 at pins SCL/SDA This is the default I2C device at the SDA/SCl labelled pin
- uart 3 at pins 0/1
- uart 4 at pins SDA/SCL
- uart 5 at pins D12/D13
or other combinations.
SAMD51 I2C assignments
``````````````````````
The I2C devices and signals must be chosen according to the following rules:
- The SDA signal must be at a Pin with pad numbers 0.
- The SCL signal must be at a Pin with pad numbers 1.
Examples for Adafruit ItsyBitsy M0 Express:
- I2C 0 at pins A3/A4
- I2C 1 at pins 0/1
- I2C 2 at the pins SDA/SCL
- I2C 3 at the pins 1/0
- I2C 4 at the pins A2/A3
- I2C 5 at the pins 12/13
or other combinations.
SAMD51 SPI assignments
``````````````````````
The SPI devices and signals must be chosen according to the following rules:
- The following pad number pairs are suitable for MOSI/SCK: 0/1 and 3/1.
- The MISO signal must be at a Pin with a different pad number than MOSI or SCK.
Examples for Adafruit ItsyBitsy M0 Express:
- SPI 1 at Pin MOSI/MISO/SCK This is the default SPI device at the MOSI/MISO/SCK labelled pins.
- SPI 3 at pins 13/11/12
- SPI 5 at pins 12/3/13
or other combinations.
SAMD51 PWM assignments
``````````````````````
The TCC/PWM device numbers 0 through 4 can be used for PWM. Device 0 has six
channels, device 1 has four channels, device 2 has three channels and devices
3 and 4 have two channels. So in total up to 5 different PWM frequencies
can be used, and up to 17 different duty cycle values. Note that these numbers
do not apply to every board.
The DAC outputs for the Adafruit ItsyBitsy M4 Express board are available at the pins A0 and A1.
Adafruit Feather M4 Express pin assignment table
------------------------------------------------
=== ==== ============ ==== ==== ==== ====== ====== ===== ===== =====
Pin GPIO Pin name IRQ ADC ADC Serial Serial TC PWM PWM
=== ==== ============ ==== ==== ==== ====== ====== ===== ===== =====
2 PA02 A0 2 0 - - - - - -
5 PA05 A1 5 5 - - 0/1 0/1 - -
40 PB08 A2 8 2 0 - 4/0 4/0 - -
41 PB09 A3 9 3 1 - 4/1 4/1 - -
4 PA04 A4 4 4 - - 0/0 0/0 - -
38 PB06 A5 6 - 8 - - - - -
49 PB17 D0 1 - - 5/1 - 6/1 3/1 0/5
48 PB16 D1 0 - - 5/0 - 6/0 3/0 0/4
14 PA14 D4 14 - - 2/2 4/2 3/0 2/0 1/2
16 PA16 D5 0 - - 1/0 3/1 2/0 1/0 0/4
18 PA18 D6 2 - - 1/2 3/2 3/0 1/2 0/6
19 PA19 D9 3 - - 1/3 3/3 3/1 1/3 0/7
3 PA03 AREF 3 10 - - - - - -
20 PA20 D10 4 - - 5/2 3/2 7/0 1/4 0/0
21 PA21 D11 5 - - 5/3 3/3 7/1 1/5 0/1
22 PA22 D12 6 - - 3/0 5/1 4/0 1/6 0/2
23 PA23 D13 7 - - 3/1 5/0 4/1 1/7 0/3
43 PB11 FLASH_CS 12 - - - 4/3 5/1 0/5 1/1
11 PA11 FLASH_HOLD 11 11 - 0/3 2/3 1/1 0/3 1/7
9 PA09 FLASH_MISO 9 9 3 0/1 2/0 0/1 0/1 1/5
8 PA08 FLASH_MOSI - 8 2 0/0 2/1 0/0 0/0 1/4
42 PB10 FLASH_SCK 10 - - - 4/2 5/0 0/4 1/0
10 PA10 FLASH_WP 10 10 - 0/2 2/2 1/0 0/2 1/6
54 PB22 MISO 22 - - 1/2 5/2 7/0 - -
55 PB23 MOSI 7 - - 1/3 5/3 7/1 - -
35 PB03 NEOPIXEL 9 15 - - 5/1 6/1 - -
17 PA17 SCK 1 - - 1/1 3/0 2/1 1/1 0/5
13 PA13 SCL 13 - - 2/1 4/0 2/1 0/7 1/3
12 PA12 SDA 12 - - 2/0 4/1 2/0 0/6 1/2
30 PA30 SWCLK 14 - - 7/2 1/2 6/0 2/0 -
31 PA31 SWDIO 15 - - 7/3 1/3 6/1 2/1 -
24 PA24 USB_DM 8 - - 3/2 5/2 5/0 2/2 -
25 PA25 USB_DP 9 - - 3/3 5/3 5/1 - -
33 PB01 VDIV 1 13 - - 5/3 7/1 - -
0 PA00 - 0 - - - 1/0 2/0 - -
1 PA01 - 1 - - - 1/1 2/1 - -
6 PA06 - 6 6 - - 0/2 1/0 - -
7 PA07 - 7 7 - - 0/3 1/1 - -
15 PA15 - 15 - - 2/3 4/3 3/1 2/1 1/3
27 PA27 - 11 - - - - - - -
32 PB00 - 9 12 - - 5/2 7/0 - -
34 PB02 - 2 14 - - 5/0 6/0 2/2 -
36 PB04 - 4 - 6 - - - - -
37 PB05 - 5 - 7 - - - - -
39 PB07 - 7 - 9 - - - - -
44 PB12 - 12 - - 4/0 - 4/0 3/0 0/0
45 PB13 - 13 - - 4/1 - 4/1 3/1 0/1
46 PB14 - 14 - - 4/2 - 5/0 4/0 0/2
47 PB15 - 15 - - 4/3 - 5/1 4/1 0/3
62 PB30 - 14 - - 7/0 5/1 0/0 4/0 0/6
63 PB31 - 15 - - 7/1 5/0 0/1 4/1 0/7
=== ==== ============ ==== ==== ==== ====== ====== ===== ===== =====
For the definition of the table columns see the explanation at the table for
Adafruit ItsyBitsy M4 Express :ref:`samd51_pinout_table`.
The default devices at the board are:
- UART 5 at pins 0/1, labelled RX/TX
- I2C 2 at pins 21/20, labelled SDA/SCL
- SPI 1 at pins 22/23/24, labelled MOSI, MISO and SCK
- DAC output on pins 14 and 15, labelled A0 and A1
SEEED XIAO pin assignment table
-------------------------------
=== ==== ============ ==== ==== ====== ====== ====== ======
Pin GPIO Pin name IRQ ADC Serial Serial TCC/TC TCC/TC
=== ==== ============ ==== ==== ====== ====== ====== ======
2 PA02 A0_D0 2 0 - - - -
4 PA04 A1_D1 4 4 - 0/0 0/0 -
10 PA10 A2_D2 10 18 0/2 2/2 1/0 0/2
11 PA11 A3_D3 11 19 0/3 2/3 1/1 0/3
8 PA08 A4_D4 - 16 0/0 2/0 0/0 1/2
9 PA09 A5_D5 9 17 0/1 2/1 0/1 1/3
40 PB08 A6_D6 8 2 - 4/0 4/0 -
41 PB09 A7_D7 9 3 - 4/1 4/1 -
7 PA07 A8_D8 7 7 - 0/3 1/1 -
5 PA05 A9_D9 5 5 - 0/1 0/1 -
6 PA06 A10_D10 6 6 - 0/2 1/0 -
18 PA18 RX_LED 2 - 1/2 3/2 3/0 0/2
30 PA30 SWCLK 10 - - 1/2 1/0 -
31 PA31 SWDIO 11 - - 1/3 1/1 -
19 PA19 TX_LED 3 - 1/3 3/3 3/1 0/3
24 PA24 USB_DM 12 - 3/2 5/2 5/0 1/2
25 PA25 USB_DP 13 - 3/3 5/3 5/1 1/3
17 PA17 USER_LED 1 - 1/1 3/1 2/1 0/7
0 PA00 - 0 - - 1/0 2/0 -
1 PA01 - 1 - - 1/1 2/1 -
3 PA03 - 3 1 - - - -
12 PA12 - 12 - 2/0 4/0 2/0 0/6
13 PA13 - 13 - 2/1 4/1 2/0 0/7
14 PA14 - 14 - 2/2 4/2 3/0 0/4
15 PA15 - 15 - 2/3 4/3 3/1 0/5
16 PA16 - 0 - 1/0 3/0 2/0 0/6
20 PA20 - 4 - 5/2 3/2 7/0 0/4
21 PA21 - 5 - 5/3 3/3 7/1 0/7
22 PA22 - 6 - 3/0 5/0 4/0 0/4
23 PA23 - 7 - 3/1 5/1 4/1 0/5
27 PA27 - 15 - - - - -
28 PA28 - 8 - - - - -
34 PB02 - 2 10 - 5/0 6/0 -
35 PB03 - 3 11 - 5/1 6/1 -
42 PB10 - 10 - - 4/2 5/0 0/4
43 PB11 - 11 - - 4/3 5/1 0/5
54 PB22 - 6 - - 5/2 7/0 -
55 PB23 - 7 - - 5/3 7/1 -
=== ==== ============ ==== ==== ====== ====== ====== ======
For the definition of the table columns see the explanation at the table for
Adafruit ItsyBitsy M0 Express :ref:`samd21_pinout_table`.
The default devices at the board are:
- UART 4 at pins 7/6, labelled A6_D6/A7_D7
- I2C 2 at pins 4/5, labelled A4_D4/A5_D5
- SPI 0 at pins 10/9/8, labelled A10_D10, A9_D9 and A8_D8
- DAC output on pin 0, labelled A0_D0
Adafruit Feather M0 Express pin assignment table
------------------------------------------------
=== ==== ============ ==== ==== ====== ====== ====== ======
Pin GPIO Pin name IRQ ADC Serial Serial TCC/TC TCC/TC
=== ==== ============ ==== ==== ====== ====== ====== ======
2 PA02 A0 2 0 - - - -
40 PB08 A1 8 2 - 4/0 4/0 -
41 PB09 A2 9 3 - 4/1 4/1 -
4 PA04 A3 4 4 - 0/0 0/0 -
5 PA05 A4 5 5 - 0/1 0/1 -
34 PB02 A5 2 10 - 5/0 6/0 -
11 PA11 D0 11 19 0/3 2/3 1/1 0/3
10 PA10 D1 10 18 0/2 2/2 1/0 0/2
14 PA14 D2 14 - 2/2 4/2 3/0 0/4
9 PA09 D3 9 17 0/1 2/1 0/1 1/3
8 PA08 D4 - 16 0/0 2/0 0/0 1/2
15 PA15 D5 15 - 2/3 4/3 3/1 0/5
20 PA20 D6 4 - 5/2 3/2 7/0 0/4
21 PA21 D7 5 - 5/3 3/3 7/1 0/7
7 PA07 D9 7 7 - 0/3 1/1 -
55 PB23 RX 7 - - 5/3 7/1 -
54 PB22 TX 6 - - 5/2 7/0 -
18 PA18 D10 2 - 1/2 3/2 3/0 0/2
16 PA16 D11 0 - 1/0 3/0 2/0 0/6
19 PA19 D12 3 - 1/3 3/3 3/1 0/3
17 PA17 D13 1 - 1/1 3/1 2/1 0/7
13 PA13 FLASH_CS 13 - 2/1 4/1 2/0 0/7
35 PB03 LED_RX 3 11 - 5/1 6/1 -
27 PA27 LED_TX 15 - - - - -
12 PA12 MISO 12 - 2/0 4/0 2/0 0/6
42 PB10 MOSI 10 - - 4/2 5/0 0/4
6 PA06 NEOPIXEL 6 6 - 0/2 1/0 -
43 PB11 SCK 11 - - 4/3 5/1 0/5
23 PA23 SCL 7 - 3/1 5/1 4/1 0/5
22 PA22 SDA 6 - 3/0 5/0 4/0 0/4
30 PA30 SWCLK 10 - - 1/2 1/0 -
31 PA31 SWDIO 11 - - 1/3 1/1 -
24 PA24 USB_DM 12 - 3/2 5/2 5/0 1/2
25 PA25 USB_DP 13 - 3/3 5/3 5/1 1/3
0 PA00 - 0 - - 1/0 2/0 -
1 PA01 - 1 - - 1/1 2/1 -
3 PA03 - 3 1 - - - -
28 PA28 - 8 - - - - -
=== ==== ============ ==== ==== ====== ====== ====== ======
For the definition of the table columns see the explanation at the table for
Adafruit ItsyBitsy M0 Express :ref:`samd21_pinout_table`.
The default devices at the board are:
- UART 5 at pins 21/20, labelled RX/TX
- I2C 3 at pins 22/23, labelled SDA/SCL
- SPI 4 at pins 24/25/26, labelled MOSI, MISO and SCK
- DAC output on pin 14, labelled A0
Adafruit Trinket M0 pin assignment table
------------------------------------------------
=== ==== ============ ==== ==== ====== ====== ====== ======
Pin GPIO Pin name IRQ ADC Serial Serial TCC/TC TCC/TC
=== ==== ============ ==== ==== ====== ====== ====== ======
8 PA08 D0 - 16 0/0 2/0 0/0 1/2
2 PA02 D1 2 0 - - - -
9 PA09 D2 9 17 0/1 2/1 0/1 1/3
7 PA07 D3 7 7 - 0/3 1/1 -
6 PA06 D4 6 6 - 0/2 1/0 -
1 PA01 DOTSTAR_CLK 1 - - 1/1 2/1 -
0 PA00 DOTSTAR_DATA 0 - - 1/0 2/0 -
10 PA10 LED 10 18 0/2 2/2 1/0 0/2
30 PA30 SWCLK 10 - - 1/2 1/0 -
31 PA31 SWDIO 11 - - 1/3 1/1 -
24 PA24 USB_DM 12 - 3/2 5/2 5/0 1/2
25 PA25 USB_DP 13 - 3/3 5/3 5/1 1/3
3 PA03 - 3 1 - - - -
4 PA04 - 4 4 - 0/0 0/0 -
5 PA05 - 5 5 - 0/1 0/1 -
11 PA11 - 11 19 0/3 2/3 1/1 0/3
14 PA14 - 14 - 2/2 4/2 3/0 0/4
15 PA15 - 15 - 2/3 4/3 3/1 0/5
16 PA16 - 0 - 1/0 3/0 2/0 0/6
17 PA17 - 1 - 1/1 3/1 2/1 0/7
18 PA18 - 2 - 1/2 3/2 3/0 0/2
19 PA19 - 3 - 1/3 3/3 3/1 0/3
22 PA22 - 6 - 3/0 5/0 4/0 0/4
23 PA23 - 7 - 3/1 5/1 4/1 0/5
27 PA27 - 15 - - - - -
28 PA28 - 8 - - - - -
=== ==== ============ ==== ==== ====== ====== ====== ======
For the definition of the table columns see the explanation at the table for
Adafruit ItsyBitsy M0 Express :ref:`samd21_pinout_table`.
The default devices at the board are:
- UART 0 at pins 3/4, labelled D3/D4
- I2C 2 at pins 0/2, labelled D0/D2
- SPI 0 at pins 4/2/3, labelled D4, D2 and D0
- DAC output on pin 1, labelled D1
SAMD21 Xplained PRO pin assignment table
----------------------------------------
=== ==== ============ ==== ==== ====== ====== ====== ======
Pin GPIO Pin name IRQ ADC Serial Serial TCC/TC TCC/TC
=== ==== ============ ==== ==== ====== ====== ====== ======
32 PB00 EXT1_PIN3 0 8 - 5/2 7/0 -
33 PB01 EXT1_PIN4 1 9 - 5/3 7/1 -
38 PB06 EXT1_PIN5 6 14 - - - -
39 PB07 EXT1_PIN6 7 15 - - - -
34 PB02 EXT1_PIN7 2 10 - 5/0 6/0 -
35 PB03 EXT1_PIN8 3 11 - 5/1 6/1 -
36 PB04 EXT1_PIN9 4 12 - - - -
37 PB05 EXT1_PIN10 5 13 - - - -
8 PA08 EXT1_PIN11 - 16 0/0 2/0 0/0 1/2
9 PA09 EXT1_PIN12 9 17 0/1 2/1 0/1 1/3
41 PB09 EXT1_PIN13 9 3 - 4/1 4/1 -
40 PB08 EXT1_PIN14 8 2 - 4/0 4/0 -
5 PA05 EXT1_PIN15 5 5 - 0/1 0/1 -
6 PA06 EXT1_PIN16 6 6 - 0/2 1/0 -
4 PA04 EXT1_PIN17 4 4 - 0/0 0/0 -
7 PA07 EXT1_PIN18 7 7 - 0/3 1/1 -
10 PA10 EXT2_PIN3 10 18 0/2 2/2 1/0 0/2
11 PA11 EXT2_PIN4 11 19 0/3 2/3 1/1 0/3
20 PA20 EXT2_PIN5 4 - 5/2 3/2 7/0 0/4
21 PA21 EXT2_PIN6 5 - 5/3 3/3 7/1 0/7
44 PB12 EXT2_PIN7 12 - 4/0 - 4/0 0/6
45 PB13 EXT2_PIN8 13 - 4/1 - 4/1 0/7
46 PB14 EXT2_PIN9 14 - 4/2 - 5/0 -
47 PB15 EXT2_PIN10 15 - 4/3 - 5/1 -
43 PB11 EXT2_PIN13 11 - - 4/3 5/1 0/5
42 PB10 EXT2_PIN14 10 - - 4/2 5/0 0/4
17 PA17 EXT2_PIN15 1 - 1/1 3/1 2/1 0/7
18 PA18 EXT2_PIN16 2 - 1/2 3/2 3/0 0/2
16 PA16 EXT2_PIN17 0 - 1/0 3/0 2/0 0/6
19 PA19 EXT2_PIN18 3 - 1/3 3/3 3/1 0/3
2 PA02 EXT3_PIN3 2 0 - - - -
3 PA03 EXT3_PIN4 3 1 - - - -
15 PA15 EXT3_PIN6 15 - 2/3 4/3 3/1 0/5
12 PA12 EXT3_PIN7 12 - 2/0 4/0 2/0 0/6
13 PA13 EXT3_PIN8 13 - 2/1 4/1 2/0 0/7
28 PA28 EXT3_PIN9 8 - - - - -
27 PA27 EXT3_PIN10 15 - - - - -
49 PB17 EXT3_PIN15 1 - 5/1 - 6/1 0/5
54 PB22 EXT3_PIN16 6 - - 5/2 7/0 -
48 PB16 EXT3_PIN17 9 - 5/0 - 6/0 0/4
55 PB23 EXT3_PIN18 7 - - 5/3 7/1 -
62 PB30 LED 14 - - 5/0 0/0 1/2
30 PA30 SWCLK 10 - - 1/2 1/0 -
31 PA31 SWDIO 11 - - 1/3 1/1 -
24 PA24 USB_DM 12 - 3/2 5/2 5/0 1/2
25 PA25 USB_DP 13 - 3/3 5/3 5/1 1/3
0 PA00 - 0 - - 1/0 2/0 -
1 PA01 - 1 - - 1/1 2/1 -
14 PA14 - 14 - 2/2 4/2 3/0 0/4
22 PA22 - 6 - 3/0 5/0 4/0 0/4
23 PA23 - 7 - 3/1 5/1 4/1 0/5
63 PB31 - 15 - - 5/1 0/1 1/3
=== ==== ============ ==== ==== ====== ====== ====== ======
For the definition of the table columns see the explanation at the table for
Adafruit ItsyBitsy M0 Express :ref:`samd21_pinout_table`.
There are no pins labelled for default devices on this board. DAC output
is on pin 32, labelled EXT3_PIN3
Minisam M4 pin assignment table
-------------------------------
=== ==== ============ ==== ==== ==== ====== ====== ===== ===== =====
Pin GPIO Pin name IRQ ADC ADC Serial Serial TC PWM PWM
=== ==== ============ ==== ==== ==== ====== ====== ===== ===== =====
16 PA16 D0 0 - - 1/0 3/1 2/0 1/0 0/4
17 PA17 D1 1 - - 1/1 3/0 2/1 1/1 0/5
19 PA19 D3 3 - - 1/3 3/3 3/1 1/3 0/7
20 PA20 D4 4 - - 5/2 3/2 7/0 1/4 0/0
21 PA21 D5 5 - - 5/3 3/3 7/1 1/5 0/1
2 PA02 A0_D9 2 0 - - - - - -
40 PB08 A1_D10 8 2 0 - 4/0 4/0 - -
41 PB09 A2_D11 9 3 1 - 4/1 4/1 - -
4 PA04 A3_D12 4 4 - - 0/0 0/0 - -
5 PA05 A4_D13 5 5 - - 0/1 0/1 - -
6 PA06 A5 6 6 - - 0/2 1/0 - -
7 PA07 A6_D2 7 7 - - 0/3 1/1 - -
3 PA03 AREF 3 10 - - - - - -
0 PA00 BUTTON 0 - - - 1/0 2/0 - -
34 PB02 DOTSTAR_CLK 2 14 - - 5/0 6/0 2/2 -
35 PB03 DOTSTAR_DATA 9 15 - - 5/1 6/1 - -
15 PA15 LED 15 - - 2/3 4/3 3/1 2/1 1/3
55 PB23 MISO 7 - - 1/3 5/3 7/1 - -
54 PB22 MOSI 22 - - 1/2 5/2 7/0 - -
1 PA01 SCK 1 - - - 1/1 2/1 - -
13 PA13 SCL 13 - - 2/1 4/0 2/1 0/7 1/3
12 PA12 SDA 12 - - 2/0 4/1 2/0 0/6 1/2
30 PA30 SWCLK 14 - - 7/2 1/2 6/0 2/0 -
31 PA31 SWDIO 15 - - 7/3 1/3 6/1 2/1 -
24 PA24 USB_DM 8 - - 3/2 5/2 5/0 2/2 -
25 PA25 USB_DP 9 - - 3/3 5/3 5/1 - -
8 PA08 - - 8 2 0/0 2/1 0/0 0/0 1/4
9 PA09 - 9 9 3 0/1 2/0 0/1 0/1 1/5
10 PA10 - 10 10 - 0/2 2/2 1/0 0/2 1/6
11 PA11 - 11 11 - 0/3 2/3 1/1 0/3 1/7
14 PA14 - 14 - - 2/2 4/2 3/0 2/0 1/2
18 PA18 - 2 - - 1/2 3/2 3/0 1/2 0/6
22 PA22 - 6 - - 3/0 5/1 4/0 1/6 0/2
23 PA23 - 7 - - 3/1 5/0 4/1 1/7 0/3
27 PA27 - 11 - - - - - - -
42 PB10 - 10 - - - 4/2 5/0 0/4 1/0
43 PB11 - 12 - - - 4/3 5/1 0/5 1/1
=== ==== ============ ==== ==== ==== ====== ====== ===== ===== =====
For the definition of the table columns see the explanation at the table for
Adafruit ItsyBitsy M4 Express :ref:`samd51_pinout_table`.
The default devices at the board are:
- UART 1 at pins 6/7, labelled D0/D1
- I2C 2 at pins 14/15, labelled SDA/SCL
- SPI 1 at pins 16/17/18, labelled MOSI, MISO and SCK
- DAC output on pins 0 and 4, labelled A0_D9 and A4_D13
Seeed WIO Terminal pin assignment table
---------------------------------------
=== ==== ============ ==== ==== ==== ====== ====== ===== ===== =====
Pin GPIO Pin name IRQ ADC ADC Serial Serial TC PWM PWM
=== ==== ============ ==== ==== ==== ====== ====== ===== ===== =====
33 PB01 CS 1 13 - - 5/3 7/1 - -
59 PB27 RX 13 - - 2/1 4/0 - 1/3 -
58 PB26 TX 12 - - 2/0 4/1 - 1/2 -
79 PC15 3V3_ENABLE 15 - - 7/3 6/3 - 0/5 1/1
78 PC14 5V_ENABLE 14 - - 7/2 6/2 - 0/4 1/0
40 PB08 A0_D0 8 2 0 - 4/0 4/0 - -
41 PB09 A1_D1 9 3 1 - 4/1 4/1 - -
7 PA07 A2_D2 7 7 - - 0/3 1/1 - -
36 PB04 A3_D3 4 - 6 - - - - -
37 PB05 A4_D4 5 - 7 - - - - -
38 PB06 A5_D5 6 - 8 - - - - -
4 PA04 A6_D6 4 4 - - 0/0 0/0 - -
39 PB07 A7_D7 7 - 9 - - - - -
6 PA06 A8_D8 6 6 - - 0/2 1/0 - -
90 PC26 BUTTON_1 10 - - - - - - -
91 PC27 BUTTON_2 11 - - 1/0 - - - -
92 PC28 BUTTON_3 12 - - 1/1 - - - -
107 PD11 BUZZER 6 - - 7/3 6/3 - 0/4 -
47 PB15 GPCLK0 15 - - 4/3 - 5/1 4/1 0/3
44 PB12 GPCLK1 12 - - 4/0 - 4/0 3/0 0/0
45 PB13 GPCLK2 13 - - 4/1 - 4/1 3/1 0/1
48 PB16 I2C_BCLK 0 - - 5/0 - 6/0 3/0 0/4
20 PA20 I2S_LRCLK 4 - - 5/2 3/2 7/0 1/4 0/0
21 PA21 I2S_SDIN 5 - - 5/3 3/3 7/1 1/5 0/1
22 PA22 I2S_SDOUT 6 - - 3/0 5/1 4/0 1/6 0/2
50 PB18 LCD_MISO 2 - - 5/2 7/2 - 1/0 -
51 PB19 LCD_MOSI 3 - - 5/3 7/3 - 1/1 -
52 PB20 LCD_SCK 4 - - 3/0 7/1 - 1/2 -
53 PB21 LCD_CS 5 - - 3/1 7/0 - 1/3 -
70 PC06 LCD_D/C 6 - - 6/2 - - - -
71 PC07 LCD_RESET 9 - - 6/3 - - - -
74 PC10 LCD_XL 10 - - 6/2 7/2 - 0/0 1/4
76 PC12 LCD_XR 12 - - 7/0 6/1 - 0/2 1/6
77 PC13 LCD_YD 13 - - 7/1 6/0 - 0/3 1/7
75 PC11 LCD_YU 11 - - 6/3 7/3 - 0/1 1/5
15 PA15 LED_BLUE 15 - - 2/3 4/3 3/1 2/1 1/3
69 PC05 LED_LCD 5 - - 6/1 - - - -
94 PC30 MIC 14 - 12 - - - - -
32 PB00 MISO 9 12 - - 5/2 7/0 - -
34 PB02 MOSI 2 14 - - 5/0 6/0 2/2 -
35 PB03 SCK 9 15 - - 5/1 6/1 - -
12 PA12 SCL0 12 - - 2/0 4/1 2/0 0/6 1/2
13 PA13 SDA0 13 - - 2/1 4/0 2/1 0/7 1/3
16 PA16 SCL1 0 - - 1/0 3/1 2/0 1/0 0/4
17 PA17 SDA1 1 - - 1/1 3/0 2/1 1/1 0/5
117 PD21 SD_DET 11 - - 1/3 3/3 - 1/1 -
83 PC19 SD_CS 3 - - 6/3 0/3 - 0/3 -
82 PC18 SD_MISO 2 - - 6/2 0/2 - 0/2 -
80 PC16 SD_MOSI 0 - - 6/0 0/1 - 0/0 -
81 PC17 SD_SCK 1 - - 6/1 0/0 - 0/1 -
30 PA30 SWCLK 14 - - 7/2 1/2 6/0 2/0 -
31 PA31 SWDIO 15 - - 7/3 1/3 6/1 2/1 -
108 PD12 SWITCH_B 7 - - - - - 0/5 -
116 PD20 SWITCH_U 10 - - 1/2 3/2 - 1/0 -
104 PD08 SWITCH_X 3 - - 7/0 6/1 - 0/1 -
105 PD09 SWITCH_Y 4 - - 7/1 6/0 - 0/2 -
106 PD10 SWITCH_Z 5 - - 7/2 6/2 - 0/3 -
24 PA24 USB_DM 8 - - 3/2 5/2 5/0 2/2 -
25 PA25 USB_DP 9 - - 3/3 5/3 5/1 - -
0 PA00 - 0 - - - 1/0 2/0 - -
1 PA01 - 1 - - - 1/1 2/1 - -
2 PA02 - 2 0 - - - - - -
3 PA03 - 3 10 - - - - - -
5 PA05 - 5 5 - - 0/1 0/1 - -
8 PA08 - - 8 2 0/0 2/1 0/0 0/0 1/4
9 PA09 - 9 9 3 0/1 2/0 0/1 0/1 1/5
10 PA10 - 10 10 - 0/2 2/2 1/0 0/2 1/6
11 PA11 - 11 11 - 0/3 2/3 1/1 0/3 1/7
14 PA14 - 14 - - 2/2 4/2 3/0 2/0 1/2
18 PA18 - 2 - - 1/2 3/2 3/0 1/2 0/6
19 PA19 - 3 - - 1/3 3/3 3/1 1/3 0/7
23 PA23 - 7 - - 3/1 5/0 4/1 1/7 0/3
27 PA27 - 11 - - - - - - -
42 PB10 - 10 - - - 4/2 5/0 0/4 1/0
43 PB11 - 12 - - - 4/3 5/1 0/5 1/1
46 PB14 - 14 - - 4/2 - 5/0 4/0 0/2
49 PB17 - 1 - - 5/1 - 6/1 3/1 0/5
54 PB22 - 22 - - 1/2 5/2 7/0 - -
55 PB23 - 7 - - 1/3 5/3 7/1 - -
56 PB24 - 8 - - 0/0 2/1 - - -
57 PB25 - 9 - - 0/1 2/0 - - -
60 PB28 - 14 - - 2/2 4/2 - 1/4 -
61 PB29 - 15 - - 2/3 4/3 - 1/5 -
62 PB30 - 14 - - 7/0 5/1 0/0 4/0 0/6
63 PB31 - 15 - - 7/1 5/0 0/1 4/1 0/7
64 PC00 - 0 - 10 - - - - -
65 PC01 - 1 - 11 - - - - -
66 PC02 - 2 - 4 - - - - -
67 PC03 - 3 - 5 - - - - -
68 PC04 - 4 - - 6/0 - - 0/0 -
84 PC20 - 4 - - - - - 0/4 -
85 PC21 - 5 - - - - - 0/5 -
86 PC22 - 6 - - 1/0 3/1 - 0/5 -
87 PC23 - 7 - - 1/1 3/0 - 0/7 -
88 PC24 - 8 - - 0/2 2/2 - - -
89 PC25 - 9 - - 0/3 2/3 - - -
95 PC31 - 15 - 13 - - - - -
96 PD00 - 0 - 14 - - - - -
97 PD01 - 1 - 15 - - - - -
=== ==== ============ ==== ==== ==== ====== ====== ===== ===== =====
For the definition of the table columns see the explanation at the table for
Adafruit ItsyBitsy M4 Express :ref:`samd51_pinout_table`.
There seems to be no default pin assignment for this board.
Sparkfun SAMD51 Thing Plus pin assignment table
------------------------------------------------
=== ==== ============ ==== ==== ==== ====== ====== ===== ===== =====
Pin GPIO Pin name IRQ ADC ADC Serial Serial TC PWM PWM
=== ==== ============ ==== ==== ==== ====== ====== ===== ===== =====
2 PA02 A0 2 0 - - - - - -
40 PB08 A1 8 2 0 - 4/0 4/0 - -
41 PB09 A2 9 3 1 - 4/1 4/1 - -
4 PA04 A3 4 4 - - 0/0 0/0 - -
5 PA05 A4 5 5 - - 0/1 0/1 - -
34 PB02 A5 2 14 - - 5/0 6/0 2/2 -
13 PA13 D0 13 - - 2/1 4/0 2/1 0/7 1/3
12 PA12 D1 12 - - 2/0 4/1 2/0 0/6 1/2
6 PA06 D4 6 6 - - 0/2 1/0 - -
15 PA15 D5 15 - - 2/3 4/3 3/1 2/1 1/3
20 PA20 D6 4 - - 5/2 3/2 7/0 1/4 0/0
21 PA21 D7 5 - - 5/3 3/3 7/1 1/5 0/1
7 PA07 D9 7 7 - - 0/3 1/1 - -
18 PA18 D10 2 - - 1/2 3/2 3/0 1/2 0/6
16 PA16 D11 0 - - 1/0 3/1 2/0 1/0 0/4
19 PA19 D12 3 - - 1/3 3/3 3/1 1/3 0/7
17 PA17 D13 1 - - 1/1 3/0 2/1 1/1 0/5
10 PA10 FLASH_CS 10 10 - 0/2 2/2 1/0 0/2 1/6
11 PA11 FLASH_MISO 11 11 - 0/3 2/3 1/1 0/3 1/7
8 PA08 FLASH_MOSI - 8 2 0/0 2/1 0/0 0/0 1/4
9 PA09 FLASH_SCK 9 9 3 0/1 2/0 0/1 0/1 1/5
43 PB11 MISO 12 - - - 4/3 5/1 0/5 1/1
44 PB12 MOSI 12 - - 4/0 - 4/0 3/0 0/0
55 PB23 RXD 7 - - 1/3 5/3 7/1 - -
35 PB03 RXLED 9 15 - - 5/1 6/1 - -
45 PB13 SCK 13 - - 4/1 - 4/1 3/1 0/1
23 PA23 SCL 7 - - 3/1 5/0 4/1 1/7 0/3
22 PA22 SDA 6 - - 3/0 5/1 4/0 1/6 0/2
30 PA30 SWCLK 14 - - 7/2 1/2 6/0 2/0 -
31 PA31 SWDIO 15 - - 7/3 1/3 6/1 2/1 -
54 PB22 TXD 22 - - 1/2 5/2 7/0 - -
27 PA27 TXLED 11 - - - - - - -
24 PA24 USB_DM 8 - - 3/2 5/2 5/0 2/2 -
25 PA25 USB_DP 9 - - 3/3 5/3 5/1 - -
0 PA00 - 0 - - - 1/0 2/0 - -
1 PA01 - 1 - - - 1/1 2/1 - -
3 PA03 - 3 10 - - - - - -
14 PA14 - 14 - - 2/2 4/2 3/0 2/0 1/2
32 PB00 - 9 12 - - 5/2 7/0 - -
33 PB01 - 1 13 - - 5/3 7/1 - -
36 PB04 - 4 - 6 - - - - -
37 PB05 - 5 - 7 - - - - -
38 PB06 - 6 - 8 - - - - -
39 PB07 - 7 - 9 - - - - -
42 PB10 - 10 - - - 4/2 5/0 0/4 1/0
46 PB14 - 14 - - 4/2 - 5/0 4/0 0/2
47 PB15 - 15 - - 4/3 - 5/1 4/1 0/3
48 PB16 - 0 - - 5/0 - 6/0 3/0 0/4
49 PB17 - 1 - - 5/1 - 6/1 3/1 0/5
62 PB30 - 14 - - 7/0 5/1 0/0 4/0 0/6
63 PB31 - 15 - - 7/1 5/0 0/1 4/1 0/7
=== ==== ============ ==== ==== ==== ====== ====== ===== ===== =====
For the definition of the table columns see the explanation at the table for
Adafruit ItsyBitsy M4 Express :ref:`samd51_pinout_table`.
The default devices at the board are:
- UART 1 at pins 2/3, labelled RXD/TXD
- I2C 5 at pins 20/21, labelled SDA/SCL
- SPI 4 at pins 22/23/24, labelled MOSI, MISO and SCK
- DAC output on pins 14 and 18, labelled A0 and A4
Scripts for creating the pin assignment tables
----------------------------------------------
The tables shown above were created with small a Python script running on the target board::
from samd import pininfo
from machine import Pin
import os
def print_entry(e, txt):
print(txt, end=": ")
if e == 255:
print(" - ", end="")
else:
print("%d/%d" % (e >> 4, e & 0x0f), end="")
def print_pininfo(pin, info):
print("%3d" % pin, end=" ")
print("P%c%02d" % ("ABCD"[pin // 32], pin % 32), end="")
print(" %12s" % info[0], end="")
print(" IRQ:%2s" % (info[1] if info[1] != 255 else "-"), end="")
print(" ADC0:%2s" % (info[2] if info[2] != 255 else "-"), end="")
if len(info) == 7:
print_entry(info[3], " Serial1")
print_entry(info[4], " Serial2")
print_entry(info[5], " PWM1" if (info[5] >> 4) < 3 else " TC")
print_entry(info[6], " PWM2")
else:
print(" ADC1:%2s" % (info[3] if info[3] != 255 else "-"), end="")
print_entry(info[4], " Serial1")
print_entry(info[5], " Serial2")
print_entry(info[6], " TC")
print_entry(info[7], " PWM1")
print_entry(info[8], " PWM2")
print()
def tblkey(i):
name = i[1][0]
if name != "-":
if len(name) < 3:
return " " + name
else:
return name
else:
return "zzzzzzz%03d" % i[0]
def table(num = 127):
pintbl = []
for i in range(num):
try:
pintbl.append((i, pininfo(i)))
except:
pass
# print("not defined")
pintbl.sort(key=tblkey)
for item in pintbl:
print_pininfo(item[0], item[1])
table()

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docs/samd/quickref.rst
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.. _samd_quickref:
Quick reference for the SAMD21/SAMD51 family
============================================
.. image:: img/itsybitsy_m4_express.jpg
:alt: Adafruit ItsyBitsy M4 Express board
:width: 640px
The Adafruit ItsyBitsy M4 Express board.
Below is a quick reference for SAMD21/SAMD51-based boards. If it is your first time
working with this board it may be useful to get an overview of the microcontroller:
.. toctree::
:maxdepth: 1
general.rst
tutorial/intro.rst
pinout.rst
Installing MicroPython
----------------------
See the corresponding section of tutorial: :ref:`samd_intro`. It also includes
a troubleshooting subsection.
General board control
---------------------
The MicroPython REPL is on the USB port, configured in VCP mode.
Tab-completion is useful to find out what methods an object has.
Paste mode (Ctrl-E) is useful to paste a large slab of Python code into
the REPL.
The :mod:`machine` module::
import machine
machine.freq() # get the current frequency of the CPU
machine.freq(96_000_000) # set the CPU frequency to 96 MHz
The range accepted by the function call is 1_000_000 to 200_000_000 (1 MHz to 200 MHz)
for SAMD51 and 1_000_000 to 48_000_000 (1 MHz to 48 MHz) for SAMD21. The safe
range for SAMD51 according to the data sheet is 96 MHz to 120 MHz.
At frequencies below 8 MHz USB will be disabled. Changing the frequency below 48 MHz
impacts the baud rates of UART, I2C and SPI. These have to be set again after
changing the CPU frequency. The ms and µs timers are not affected by the frequency
change.
Delay and timing
----------------
Use the :mod:`time <time>` module::
import time
time.sleep(1) # sleep for 1 second
time.sleep_ms(500) # sleep for 500 milliseconds
time.sleep_us(10) # sleep for 10 microseconds
start = time.ticks_ms() # get millisecond counter
delta = time.ticks_diff(time.ticks_ms(), start) # compute time difference
Clock and time
--------------
Two groups of functions are provided for time information. All boards have the
datetime(), mktime() and time() functions. Boards with a 32kHz crystal also
provide an RTC() module. The epoch start date is 1.1.2000.
Use the :mod:`time <time>` module::
import time
date_time = time.localtime() # Show the actual date/time information
date_time = time.localtime(seconds) # decode the date/time form the seconds value
seconds = time.mktime(date_time_tuple) # Convert seconds to a datetime tuple
second = time.time() # Return the actual system time.
The format of the date_time tuple follows the standard. The µs value of the date_time
tuple is ignored. On boards without the RTC module, time.localtime(seconds) sets the
system time. Use of the Use the :mod:`RTC <RTC>` module::
from machine import RTC
rtc = RTC()
date_time = rtc.datetime() # return the actual date & time.
rtc.datetime(date_time_tuple) # Set date & time, ignoring weekday
date_time = rtc.now() # Return date & time in Unix order.
rtc.calibration(value) # Set a calibration factor
The weekday value set will be ignored and calculated in the returned tuple from the
actual date. rtc.now() is only provided at SAMD51 boards. The value used in the
rtc.calibration() call has a range from -127 - 127. It defines roughly a
ppm quantity, by which the clock can run faster or slower.
Timers
------
The SAMD21/SAMD51 uses software timers. Use the :ref:`machine.Timer <machine.Timer>` class::
from machine import Timer
tim0 = Timer()
tim0.init(period=5000, mode=Timer.ONE_SHOT, callback=lambda t:print(0))
tim1 = Timer()
tim1.init(period=2000, mode=Timer.PERIODIC, callback=lambda t:print(1))
The period is in milliseconds.
.. _samd_Pins_and_GPIO:
Pins and GPIO
-------------
Use the :ref:`machine.Pin <machine.Pin>` class::
from machine import Pin
p0 = Pin('D0', Pin.OUT) # create output pin on GPIO0
p0.on() # set pin to "on" (high) level
p0.off() # set pin to "off" (low) level
p0.value(1) # set pin to on/high
p2 = Pin('D2', Pin.IN) # create input pin on GPIO2
print(p2.value()) # get value, 0 or 1
p4 = Pin('D4', Pin.IN, Pin.PULL_UP) # enable internal pull-up resistor
p7 = Pin("PA07", Pin.OUT, value=1) # set pin high on creation
Pins can be denoted by a string or a number. The string is either the
pin label of the respective board, like "D0" or "SDA", or in the form
"Pxnn", where x is A,B,C or D, and nn a two digit number in the range 0-31.
Examples: "PA03", PD31".
Pin numbers are the MCU port numbers in the range::
PA0..PA31: 0..31
PB0..PB31: 32..63
PC0..PC31: 64..95
PD0..PD31: 96..127
Note: On Adafruit Feather and ItsyBity boards, pin D5 is connected to an external
gate output and can therefore only be used as input.
UART (serial bus)
-----------------
See :ref:`machine.UART <machine.UART>`. ::
# Use UART 3 on a ItsyBitsy M4 board
from machine import UART
uart3 = UART(3, tx=Pin(1), rx=Pin(0), baudrate=115200)
uart3.write('hello') # write 5 bytes
uart3.read(5) # read up to 5 bytes
The SAMD21/SAMD51 MCUs have up to eight hardware so called SERCOM devices, which can be used as UART,
SPI or I2C device, but not every MCU variant and board exposes all
TX and RX pins for users. For the assignment of Pins to devices and UART signals,
refer to the :ref:`SAMD pinout <samd_pinout>`.
PWM (pulse width modulation)
----------------------------
Up to five timer device of the SAMD21/SAMD51 MCUs are used for creating PWM signals.
The PWM functions are provided by the :ref:`machine.PWM <machine.PWM>` class.
It supports all basic methods listed for that class. ::
# Samples for Adafruit ItsyBitsy M4 Express
from machine import Pin, PWM
pwm = PWM(Pin(7)) # create PWM object from a pin
pwm.freq() # get current frequency
pwm.freq(1000) # set frequency
pwm.duty_u16() # get current duty cycle, range 0-65535
pwm.duty_u16(200) # set duty cycle, range 0-65535
pwm.deinit() # turn off PWM on the pin
pwm # show the PWM objects properties
PWM Constructor
```````````````
.. class:: PWM(dest, freq, duty_u16, duty_ns, *, invert, device)
:noindex:
Construct and return a new PWM object using the following parameters:
- *dest* is the Pin object on which the PWM is output.
PWM objects are provided by TCC timer module. The TCC timer modules have up
to six channels and eight outputs. All channels of a module run at the same
frequency, but allow for different duty cycles. Outputs are assigned to channels
in modulo-n fashion, where n is the number of channels. Outputs of a channel
have the same frequency and duty rate, but may have different polarity.
So if for instance a module has four channels, output 0 and 4, 1 and 5,
2 and 6, 3, and 7 share the same frequency and duty rate.
Only one of *duty_u16* and *duty_ns* should be specified at a time.
Keyword arguments:
- *freq* should be an integer which sets the frequency in Hz for the
PWM cycle. The valid frequency range is 1 Hz to 24 MHz.
- *duty_u16* sets the duty cycle as a ratio ``duty_u16 / 65536``.
The duty cycle of a X channel can only be changed, if the A and B channel
of the respective submodule is not used. Otherwise the duty_16 value of the
X channel is 32768 (50%).
- *duty_ns* sets the pulse width in nanoseconds. The limitation for X channels
apply as well.
- *invert*\=True|False. Setting a bit inverts the respective output.
- *device*\=n Use TCC module n if available. At some pins two TCC modules could be
used. If not device is mentioned, the software tries to use a module which is not yet
used for a PWM signal. But if pins shall have the same frequency and/or duty cycle
to be changed synchronously, they must be driven by the same TCC module.
PWM Methods
```````````
The methods are identical to the generic :ref:`machine.PWM <machine.PWM>` class,
with additional keyword arguments to the init() method, matchings those of the constructor.
PWM Pin Assignment
``````````````````
Pins are specified in the same way as for the Pin class. For the assignment of Pins
to PWM signals, refer to the :ref:`SAMD pinout <samd_pinout>`.
ADC (analog to digital conversion)
----------------------------------
On the SAMD21/SAMD51 ADC functionality is available on Pins labelled 'Ann'.
Use the :ref:`machine.ADC <machine.ADC>` class::
from machine import ADC
adc0 = ADC(Pin("A0")) # create ADC object on ADC pin, average=16
adc0.read_u16() # read value, 0-65536 across voltage range 0.0v - 3.3v
adc1 = ADC(Pin("A1"), average=1) # create ADC object on ADC pin, average=1
The resolution of the ADC is 12 bit with 12 bit accuracy, irrespective of the
value returned by read_u16(). If you need a higher resolution or better accuracy, use
an external ADC.
ADC Constructor
```````````````
.. class:: ADC(dest, *, average=16)
:noindex:
Construct and return a new ADC object using the following parameters:
- *dest* is the Pin object on which the ADC is output.
Keyword arguments:
- *average* is used to reduce the noise. With a value of 16 the LSB noise is about 1 digit.
DAC (digital to analog conversion)
----------------------------------
The DAC class provides a fast digital to analog conversion. Usage example::
from machine import DAC
dac0 = DAC(0) # create DAC object on DAC pin A0
dac0.write(1023) # write value, 0-4095 across voltage range 0.0v - 3.3v
dac1 = DAC(1) # create DAC object on DAC pin A1
dac1.write(2000) # write value, 0-4095 across voltage range 0.0v - 3.3v
The resolution of the DAC is 12 bit for SAMD51 and 10 bit for SAMD21. SAMD21 devices
have 1 DAC channel at GPIO PA02, SAMD51 devices have 2 DAC channels at GPIO PA02 and PA05.
Software SPI bus
----------------
Software SPI (using bit-banging) works on all pins, and is accessed via the
:ref:`machine.SoftSPI <machine.SoftSPI>` class. ::
from machine import Pin, SoftSPI
# construct a SoftSPI bus on the given pins
# polarity is the idle state of SCK
# phase=0 means sample on the first edge of SCK, phase=1 means the second
spi = SoftSPI(baudrate=100000, polarity=1, phase=0, sck=Pin(7), mosi=Pin(9), miso=Pin(10))
spi.init(baudrate=200000) # set the baud rate
spi.read(10) # read 10 bytes on MISO
spi.read(10, 0xff) # read 10 bytes while outputting 0xff on MOSI
buf = bytearray(50) # create a buffer
spi.readinto(buf) # read into the given buffer (reads 50 bytes in this case)
spi.readinto(buf, 0xff) # read into the given buffer and output 0xff on MOSI
spi.write(b'12345') # write 5 bytes on MOSI
buf = bytearray(4) # create a buffer
spi.write_readinto(b'1234', buf) # write to MOSI and read from MISO into the buffer
spi.write_readinto(buf, buf) # write buf to MOSI and read MISO back into buf
The highest supported baud rate is 500000.
Hardware SPI bus
----------------
The SAMD21/SAMD51 MCUs have up to eight hardware so called SERCOM devices, which can be used as UART,
SPI or I2C device, but not every MCU variant and board exposes all
signal pins for users. Hardware SPI is accessed via the
:ref:`machine.SPI <machine.SPI>` class and has the same methods as software SPI above::
from machine import SPI
spi = SPI(1, sck=Pin("SCK"), mosi=Pin("MOSI"), miso=Pin("MISO"), baudrate=10000000)
spi.write('Hello World')
If miso is not specified, it is not used. For the assignment of Pins to SPI devices and signals, refer to
:ref:`SAMD pinout <samd_pinout>`.
Note: Even if the highest reliable baud rate at the moment is about 24 Mhz,
setting a baud rate will not always result in exactly that frequency, especially
at high baud rates.
Software I2C bus
----------------
Software I2C (using bit-banging) works on all output-capable pins, and is
accessed via the :ref:`machine.SoftI2C <machine.SoftI2C>` class::
from machine import Pin, SoftI2C
i2c = SoftI2C(scl=Pin(10), sda=Pin(11), freq=100000)
i2c.scan() # scan for devices
i2c.readfrom(0x3a, 4) # read 4 bytes from device with address 0x3a
i2c.writeto(0x3a, '12') # write '12' to device with address 0x3a
buf = bytearray(10) # create a buffer with 10 bytes
i2c.writeto(0x3a, buf) # write the given buffer to the slave
The highest supported freq is 400000.
Hardware I2C bus
----------------
The SAMD21/SAMD51 MCUs have up to eight hardware so called SERCOM devices,
which can be used as UART, SPI or I2C device, but not every MCU variant
and board exposes all signal pins for users.
For the assignment of Pins to devices and I2C signals, refer to :ref:`SAMD pinout <samd_pinout>`.
Hardware I2C is accessed via the :ref:`machine.I2C <machine.I2C>` class and
has the same methods as software SPI above::
from machine import I2C
i2c = I2C(2, scl=Pin("SCL"), sda=Pin("SDA"), freq=400_000)
i2c.writeto(0x76, b"Hello World")
OneWire driver
--------------
The OneWire driver is implemented in software and works on all pins::
from machine import Pin
import onewire
ow = onewire.OneWire(Pin(12)) # create a OneWire bus on GPIO12
ow.scan() # return a list of devices on the bus
ow.reset() # reset the bus
ow.readbyte() # read a byte
ow.writebyte(0x12) # write a byte on the bus
ow.write('123') # write bytes on the bus
ow.select_rom(b'12345678') # select a specific device by its ROM code
There is a specific driver for DS18S20 and DS18B20 devices::
import time, ds18x20
ds = ds18x20.DS18X20(ow)
roms = ds.scan()
ds.convert_temp()
time.sleep_ms(750)
for rom in roms:
print(ds.read_temp(rom))
Be sure to put a 4.7k pull-up resistor on the data line. Note that
the ``convert_temp()`` method must be called each time you want to
sample the temperature.
DHT driver
----------
The DHT driver is implemented in software and works on all pins::
import dht
import machine
d = dht.DHT11(machine.Pin(4))
d.measure()
d.temperature() # eg. 23 (°C)
d.humidity() # eg. 41 (% RH)
d = dht.DHT22(machine.Pin(4))
d.measure()
d.temperature() # eg. 23.6 (°C)
d.humidity() # eg. 41.3 (% RH)
Be sure to have a 4.7k pull-up resistor on the data line. Some
DHT modules may already have one.
Driving an APA102 LED
---------------------
The APA102 on some Adafruit boards can be controlled using SoftSPI::
from machine import SoftSPI, Pin
# create the SPI object. miso can be any unused pin.
spi=SoftSPI(sck=Pin(25), mosi=Pin(26), miso=Pin(14))
# define a little function that writes the data with
# preamble and postfix
def write(red, green, blue):
spi.write(b"\x00\x00\x00\x00\xff")
spi.write(bytearray((blue, green, red)))
spi.write(b"\xff\xff\xff")
# set the LED to red
write(128, 0, 0)
Since SoftSPI does not allow miso to be undefined, miso has to be
assigned to an otherwise unused pin.
Driving a Neopixel LED
----------------------
The built-in machine.bitstream() method supports driving Neopixel LEDs in combination
with the Neopixel driver from the MicroPython driver library::
import neopixel
import machine
# 1 LED connected to Pin D8 on Adafruit Feather boards
p = machine.Pin(8, machine.Pin.OUT)
n = neopixel.NeoPixel(p, 1)
# set the led to red.
n[0] = (128, 0, 0)
# Update the LED.
n.write()
machine.bitstream() is set up for a SAMD21 clock frequency of 48MHz and a SAMD51
clock frequency of 120 MHz. At other clock frequencies, the timing will not fit.
Transferring files
------------------
Files can be transferred to the SAMD21/SAMD51 devices for instance with the
:ref:`mpremote <mpremote>` tool. See the MicroPython forum for community-supported
alternatives to transfer files to an SAMD21/SAMD51 board, like rshell or Thonny.

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.. _samd_intro:
Getting started with MicroPython on the SAMD
==============================================
Using MicroPython is a great way to get the most of your SAMD board. And
vice versa, the SAMD chip is a great platform for using MicroPython. This
tutorial will guide you through setting up MicroPython, getting a prompt, using
the hardware peripherals, and controlling some external components.
Let's get started!
Requirements
------------
The first thing you need is a board with an SAMD chip. The MicroPython
software supports the SAMD chip itself and any board should work. The main
characteristic of a board is how the GPIO pins are connected to the outside
world, and whether it includes a built-in USB-serial converter to make the
UART available to your PC.
Names of pins will be given in this tutorial using the board names ("D0")
and it should be straightforward to find which pin this corresponds to on your
particular board.
Powering the board
------------------
If your board has a USB connector on it then most likely it is powered through
this when connected to your PC. Otherwise you will need to power it directly.
Please refer to the documentation for your board for further details.
Getting the firmware
--------------------
Firmware versions are provided at the
`MicroPython download page <https://micropython.org/download/?port=samd>`_.
You can download the most recent MicroPython firmware .uf2 file to load
onto your SAMD device. From that download page you have two main choices:
* stable firmware builds
* daily firmware builds
If you are just starting with MicroPython, the best bet is to go for the stable
firmware builds. If you are an advanced, experienced MicroPython SAMD user
who would like to follow development closely and help with testing new
features, there are daily builds. They run through the same rigid internal
test sequence as the stable builds, but the firmware features may change.
Deploying the firmware
----------------------
Once you have the MicroPython firmware you need to load it onto your
SAMD device. Most of the boards support the following easy procedure for
firmware upload.
- Connect the board by an USB-A/USB-Micro cable to your PC.
- Push the reset button twice. Then, a drive should pop up at the
PC's file manager. Many boards have a on-board RGB LED, which first lights up
red, and then changes it's colour to green. The timing of the double push is
sometimes tricky. So you may have to try to get the proper rhythm.
- Copy the .uf2 file to that newly opened drive. A LED on the board may
flash a while. When the copy is finished, the board drive will disappear and the
RGB led will turn from green to the initial state.
Serial prompt
-------------
Once you have the firmware on the device you can access the REPL (Python prompt)
over USB.
From there you can follow the SAMD tutorial.
Troubleshooting installation problems
-------------------------------------
If you experience problems during flashing or with running firmware immediately
after it, here are some troubleshooting recommendations:
* Be aware of and try to exclude hardware problems. There are two common
problems: bad power source quality, and worn-out/defective Flash ROM.
Speaking of power source, not just raw amperage is important, but also low
ripple and noise/EMI in general. The most reliable and convenient power
source is a USB port.

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@ -81,6 +81,10 @@
<a class="biglink" href="{{ pathto("renesas-ra/quickref") }}">Quick reference for the Renesas RA</a><br/>
<span class="linkdescr">general information for Renesas RA based boards, snippets of useful code, and a tutorial</span>
</p>
<p class="biglink">
<a class="biglink" href="{{ pathto("samd/quickref") }}">Quick reference for the SAMD21/SAMD51</a><br/>
<span class="linkdescr">general information for SAMD21/SAMD51 based boards, snippets of useful code, and a tutorial</span>
</p>
</td>
</tr></table>

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