GPIO Mappings

Sadly it is not trivial to get the correct GPIO numbers that easy, this is why we try to provide a full list of GPIO Mappings on the following pages.

As new compute modules are released, new GPIO Mapping tables are needed and sometimes software updates also can change this mapping (we saw some problems with Jetpack 5.0).

The following chapter on how to calculate GPIOs is provided if you encounter any problems with our GPIO mapping tables

How to calculate GPIOs

Pleas first check if your compute module is included in the provided tables

AGX-Xavier / AGX-Xavier-Industrial / AGX-OrinNano / TX2-NX / Xavier-NXTX1 / TX2 / TX2i

The above list should include every GPIO mapping there is. This “how to” may help you find errors we did in our documentation or to calculate GPIOs for upcoming compute modules or software changes.

GPIOnumber

The basic formula:

GPIOnumber = GPIOletter *8 + GPIOdigit + GPIOoffset

GPIOletter

The GPIOletter is located between [GPIO3_P] and [.digit]

GPIOname
GPIOletter
GPIOletter (referenced)

GPIO3_PK.04

K.

10 (for AGX Xavier)

GPIO3_PCC.07

CC

2 (for AGX Xavier)

This letter needs to be referenced to a number.

This number is individual to every Jetson module and can be found in the “tegra-gpio.h” (name may differ depending on module).

The Table is included at the end of this guide.

GPIOdigit

The GPIOdigit is easiest to get and can be extracted directly from the name.

GPIO3_PO.[GPIOdigit]

GPIOname
GPIOdigit

GPIO3_PK.04

4

GPIO3_PCC.07

7

GPIOoffset

The Jetson module has 2 GPIO-Chips with a given offset. Each Chip provides a specific amount of GPIO's that are divided into several segments. The segments are differentiated by using letters.

GPIOname
GPIOoffset key
GPIOoffset (referenced)

GPIO3_PK.04

K.

288 (for AGX Xavier)

GPIO3_PCC.07

CC

248 (for AGX Xavier)

Example

Calculating GPIO number GPIO3_PK.04 for Jetson AGX Xavier:

GPIOnumber = GPIOletter *8 + GPIOdigit + GPIOoffset
GPIOnumber =    10      *8 +     4     +   288       = 372   #GPIO3_PK.04 on AGX Xavier

Table

These tables are extracted from the “tegra-gpio.h” file for the specific module:

Alpha Key
Value
Offset
Note

A.

0

288

B.

1

288

C.

2

288

D.

3

288

E.

4

288

F.

5

288

G.

6

288

H.

7

288

I.

8

288

J.

9

288

K.

10

288

L.

11

288

M.

12

288

N.

13

288

O.

14

288

P.

15

288

Q.

16

288

R.

17

288

S.

18

288

T.

19

288

U.

20

288

V.

21

288

W.

22

288

X.

23

288

Y.

24

288

Z.

25

288

AA

0

248

AON GPIO

BB

1

248

AON GPIO

CC

2

248

AON GPIO

DD

3

248

AON GPIO

EE

4

248

AON GPIO

FF

26

288

GG

27

288

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