Connect STM32 with Jetson Orin Nao Devkit through UART

[mozammel.hossain]

Hello developers,

I want to connect STM32F051 as a port extender with Jetson Orin Nano 8 GB Devkit through UART. I need help finding examples or resources about this. Does anyone know how I can start?

[KevinFFF]

Hi mozammel.hossain,

What’s your Jetpack version in use?

What do you mean about “port extender”?
May I know what’s your use case to add this MCU?

I can instruct how to use UART on Jetson device but I can’t tell you how to use UART from STM32 since it is not developed from us.
If you want create communication between Orin Nano and STM32 through UART interface, you should connect as following first.
UART-TX (Orin Nano) → UART-RX(STM32)
UART-RX (Orin Nano) ← UART-TX(STM32)
UART-RTS (Orin Nano) → UART-CTS(STM32)
UART-CTS (Orin Nano) ← UART-RTS(STM32)
GND (Orin Nano) ← GND(STM32)

You may create your own protocol to transmit your custom data between them.
If you just want to get more available PIN to be used, you can just use IO-expander module instead of MCU.

[mozammel.hossain]

Jetpack 5.1.1. Port extender means i want need more GPIO pin, so STM32 MCU will act like one. I am using an IO expander module but connected through MCU.

Issue is solved. Thank you for your suggestions. It seems only these three connection is need.

There is some UART selection issue in both Jetson Orin Nano devkit and MCU side. I was selected debug UART in MCU.

UART-TX (Orin Nano) → UART-RX(STM32)
UART-RX (Orin Nano) ← UART-TX(STM32)
GND (Orin Nano) ← GND(STM32)