Pinmux change in Jetson ORIN AGX (64GB) Developer kit

[JK_Roopan]

Hi there! I have a Jetson Orin AGX (64GB) Developer kit. I would like to use it for an application where I need to read the two phases of an encoder pulse. Also I would like to use both the CAN controllers.

1. In order to read the encoder pulses, I need the GPIO pins to be pulled down so that my I can read my high pulses from the encoder. I tried to use the pins 29,31 which are both PD internally (Checked it with a multimeter) and also works with my encoder, but pin 31 is mentioned as Int PU in the pinmux spreadsheet.

Also I don’t wanna use the CAN0 pins for this encoder application. So I wanted to use other GPIO pins that has internal PD. Are there any errors in the pinmux spreadsheet? Or am I doing something wrong here? Need help in changing the pinmux config of my GPIO pins. What other pins can be used for my requirement?

2. Also while trying to understand the pinmux spreadsheet and my current pin configuration, I tried to used the pins 16,32 which are marked as DMIC input. where pin 32 is INT PU (I would like to change it to INT PD). which has the names 16 - GPIO3_PBB.01, 32 - GPIO3_PBB.00 which corresponds to the gpio numbers PBB.01 - gpio325, PBB.00 - gpio324
   

But the image from JetsonHacks marks pin 16 as gpio-357. Please clarify this, also I’m puzzled on how to understand how the gpio corresponds to the pin numbers in J30 header.

[KevinFFF]

Hi JK_Roopan,

What’s your Jetpack version in use?

@JK_Roopan

I tried to use the pins 29,31

Do you mean the pin from 40-pin expansion header?

If so, please refer to the following figure:

PIN29 and PIN31 are D59 and F58 respectively in pinmux spreadsheet.

Please configure the column of “Customer Usage”

@JK_Roopan

But the image from JetsonHacks marks pin 16 as gpio-357. Please clarify this,

Please just refer to the gpio number reported from your sysfs node.

[JK_Roopan]

Could you please clarify this part?

I’m puzzled on how to understand how the gpio reported in sysfs node corresponds to the pin numbers in J30 header[40 pin connector]

Edit: Kindly point me in the right direction, that would be sufficient.

[KevinFFF]

You could refer to the following thread about how to check the gpio number for your desired pin.
Mapping of Xavier NX GPIO pins to /sys/class/gpio/export - #5 by KevinFFF

Please check the pinmux spreadsheet and design guide for AGX Orin in your case.

[JK_Roopan]

Will do check it out and come back.