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.

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 D1 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 D0/D1 This is the default UART at the RX/TX labelled pins
uart 1 at pins D12/D10
uart 2 at pins D0/D1
uart 3 at pins D11/D13
uart 4 at pins D2/D5
uart 5 at pins SCL/SDA

or other combinations. For hardware flow control, tx must be at pad 0, rx at pad 1, rts at pad 2 and cts at pad 3. This applies for instance to UART 3 or UART 1 at the pins D13/D11/D10/D12 for rx/tx/rts/cts.

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 D11/D13
I2C 2 at the pins D4/D3
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 SPI 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 D0/D4/D1
SPI 1 at pins D11/D12/D13
SPI 2 at pins D0/D4/D1
SPI 3 at pins D11/D12/D13
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.

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
55	PB23	MISO	7			1/3	5/3	7/1
0	PA00	MOSI	0				1/0	2/0
43	PB11	QSPI_CS	12				4/3	5/1	0/5	1/1
8	PA08	QSPI_D0		8	2	0/0	2/1	0/0	0/0	1/4
9	PA09	QSPI_D1	9	9	3	0/1	2/0	0/1	0/1	1/5
10	PA10	QSPI_D2	10	10		0/2	2/2	1/0	0/2	1/6
11	PA11	QSPI_D3	11	11		0/3	2/3	1/1	0/3	1/7
42	PB10	QSPI_SCK	10				4/2	5/0	0/4	1/0
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 D1 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 D1/D0 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 D0/D1
uart 4 at pins SDA/SCL
uart 5 at pins D12/D13

or other combinations. For hardware flow control, tx must be at pad 0, rx at pad 1, rts at pad 2 and cts at pad 3. This applies for instance to UART 5 at the pins D12/D13/D10/D11 for rx/tx/rts/cts.

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 D0/D1
I2C 2 at the pins SDA/SCL
I2C 3 at the pins D1/D0
I2C 4 at the pins A2/A3
I2C 5 at the pins D12/D13

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 D13/D11/D12
SPI 5 at pins D12/D3/D13

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
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
43	PB11	QSPI_CS	12				4/3	5/1	0/5	1/1
8	PA08	QSPI_D0		8	2	0/0	2/1	0/0	0/0	1/4
9	PA09	QSPI_D1	9	9	3	0/1	2/0	0/1	0/1	1/5
10	PA10	QSPI_D2	10	10		0/2	2/2	1/0	0/2	1/6
11	PA11	QSPI_D3	11	11		0/3	2/3	1/1	0/3	1/7
42	PB10	QSPI_SCK	10				4/2	5/0	0/4	1/0
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 D0/D1, labelled RX/TX
I2C 2 at pins PA12/PA13, labelled SDA/SCL
SPI 1 at pins PA23/PA22/PA17, labelled MOSI, MISO and SCK
DAC output on pins PA02 and PA05, labelled A0 and A1

Adafruit Metro M4 Airlift 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
6	PA06	A2	6	6			0/2	1/0
32	PB00	A3	9	12			5/2	7/0
40	PB08	A4	8	2	0		4/0	4/0
41	PB09	A5	9	3	1		4/1	4/1
23	PA23	D0	7			3/1	5/0	4/1	1/7	0/3
22	PA22	D1	6			3/0	5/1	4/0	1/6	0/2
49	PB17	D2	1			5/1		6/1	3/1	0/5
48	PB16	D3	0			5/0		6/0	3/0	0/4
45	PB13	D4	13			4/1		4/1	3/1	0/1
46	PB14	D5	14			4/2		5/0	4/0	0/2
47	PB15	D6	15			4/3		5/1	4/1	0/3
44	PB12	D7	12			4/0		4/0	3/0	0/0
21	PA21	D8	5			5/3	3/3	7/1	1/5	0/1
20	PA20	D9	4			5/2	3/2	7/0	1/4	0/0
3	PA03	AREF	3	10
18	PA18	D10	2			1/2	3/2	3/0	1/2	0/6
19	PA19	D11	3			1/3	3/3	3/1	1/3	0/7
16	PA16	D13	0			1/0	3/1	2/0	1/0	0/4
36	PB04	ESP_BUSY	4		6
15	PA15	ESP_CS	15			2/3	4/3	3/1	2/1	1/3
33	PB01	ESP_GPIO0	1	13			5/3	7/1
37	PB05	ESP_RESET	5		7
55	PB23	ESP_RTS	7			1/3	5/3	7/1
7	PA07	ESP_RX	7	7			0/3	1/1
4	PA04	ESP_TX	4	4			0/0	0/0
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
14	PA14	MISO	14			2/2	4/2	3/0	2/0	1/2
12	PA12	MOSI	12			2/0	4/1	2/0	0/6	1/2
54	PB22	NEOPIXEL	22			1/2	5/2	7/0
38	PB06	RXLED	6		8
13	PA13	SCK	13			2/1	4/0	2/1	0/7	1/3
35	PB03	SCL	9	15			5/1	6/1
34	PB02	SDA	2	14			5/0	6/0	2/2
30	PA30	SWCLK	14			7/2	1/2	6/0	2/0
31	PA31	SWDIO	15			7/3	1/3	6/1	2/1
62	PB30	SWO	14			7/0	5/1	0/0	4/0	0/6
39	PB07	TXLED	7		9
24	PA24	USB_DM	8			3/2	5/2	5/0	2/2
25	PA25	USB_DP	9			3/3	5/3	5/1
17	PA17	USB_HOSTEN	1			1/1	3/0	2/1	1/1	0/5
0	PA00		0				1/0	2/0
1	PA01		1				1/1	2/1
27	PA27		11
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 3 at pins PA23/PA22, labelled D0/D1 resp. RX/TX
I2C 5 at pins PB02/PB03, labelled SDA/SCL
SPI 4 at pins PA12/PA14/PA13, labelled MOSI, MISO and SCK
DAC output on pins PA02 and PA05, 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 PB08/PB09, labelled A6_D6/A7_D7
I2C 2 at pins PA08/PA09, labelled A4_D4/A5_D5
SPI 0 at pins PA06/PA05/PA07, labelled A10_D10, A9_D9 and A8_D8
DAC output on pin PA02, 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 PB23/PB22, labelled RX/TX
I2C 3 at pins PA22/PA23, labelled SDA/SCL
SPI 4 at pins PA10/PA12/PA11, labelled MOSI, MISO and SCK
DAC output on pin PA02, 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 PA07/PA06, labelled D3/D4
I2C 2 at pins PA08/PA09, labelled D0/D2
SPI 0 at pins PA06/PA09/PA08, labelled D4, D2 and D0
DAC output on pin PA02, 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 PA02, 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
43	PB11	QSPI_CS	12				4/3	5/1	0/5	1/1
8	PA08	QSPI_D0		8	2	0/0	2/1	0/0	0/0	1/4
9	PA09	QSPI_D1	9	9	3	0/1	2/0	0/1	0/1	1/5
10	PA10	QSPI_D2	10	10		0/2	2/2	1/0	0/2	1/6
11	PA11	QSPI_D3	11	11		0/3	2/3	1/1	0/3	1/7
42	PB10	QSPI_SCK	10				4/2	5/0	0/4	1/0
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
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

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 PA16/PA17, labelled D0/D1
I2C 2 at pins PA12/PA13, labelled SDA/SCL
SPI 1 at pins PB22/PB23/PA01, labelled MOSI, MISO and SCK
DAC output on pins PA02 and PA05, 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
43	PB11	QSPI_CS	12				4/3	5/1	0/5	1/1
8	PA08	QSPI_D0		8	2	0/0	2/1	0/0	0/0	1/4
9	PA09	QSPI_D1	9	9	3	0/1	2/0	0/1	0/1	1/5
10	PA10	QSPI_D2	10	10		0/2	2/2	1/0	0/2	1/6
11	PA11	QSPI_D3	11	11		0/3	2/3	1/1	0/3	1/7
42	PB10	QSPI_SCK	10				4/2	5/0	0/4	1/0
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
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
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`.

Default pin assignments: - UART 2 at pins PB27 and PB26, labelled RX and TX - I2C 4 at pins PA12 and PA13, labelled SCL0 and SDA0 - I2C 3 at pins PA16 and PA17, labelled SCL1 and SDA1 - SPI 5 at pins PB00, PB02 and PB03, labelle MISO, MOSI and SCK

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 PB23/PB22, labelled RXD/TXD
I2C 5 at pins PA22/PA23, labelled SDA/SCL
SPI 4 at pins PB12/PB11/PB13, labelled MOSI, MISO and SCK
DAC output on pins PA02 and PA05, 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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pinout.rst

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pinout.rst

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Pinout for the SAMD machine modules

Adafruit ItsyBitsy M0 Express pin assignment table

SAMD21 UART assignments

SAMD21 I2C assignments

SAMD21 SPI assignments

SAMD21 PWM assignments

Adafruit ItsyBitsy M4 Express pin assignment table

SAMD51 UART assignments

SAMD51 I2C assignments

SAMD51 SPI assignments

SAMD51 PWM assignments

Adafruit Feather M4 Express pin assignment table

Adafruit Metro M4 Airlift pin assignment table

SEEED XIAO pin assignment table

Adafruit Feather M0 Express pin assignment table

Adafruit Trinket M0 pin assignment table

SAMD21 Xplained PRO pin assignment table

Minisam M4 pin assignment table

Seeed WIO Terminal pin assignment table

Sparkfun SAMD51 Thing Plus pin assignment table

Scripts for creating the pin assignment tables