Arduino UNO Q (STM32U585)

Overview

The Arduino UNO Q pairs a Qualcomm QRB2210 (Snapdragon 215 running Linux) with an STM32U585OI (Cortex-M33). The QRB2210’s GPIOs reach the STM32’s SWD pins through on-board level shifters, which the linuxgpiod driver can drive directly.

Pin map

Signal gpiochip Line
SWCLK gpiochip1 26
SWDIO gpiochip1 25
SRST gpiochip1 38

Selector for all probe-rs commands:

0:0:gpiochip1,swclk=26,swdio=25,srst=38

Chip description (one-time)

probe-rs doesn’t currently bundle the STM32U5 family. Generate a YAML description from STMicroelectronics’ CMSIS pack with target-gen:

Terminal window
$ curl -sSL -o pack.pack \
    https://www.keil.com/pack/Keil.STM32U5xx_DFP.3.2.0.pack
$ target-gen pack pack.pack ./u5-targets/

Pass the resulting STM32U5_Series.yaml via --chip-description-path; use the full STM package code as the chip name (STM32U585OIYxQ for the UNO Q):

Terminal window
$ probe-rs info \
    --probe '0:0:gpiochip1,swclk=26,swdio=25,srst=38' \
    --chip STM32U585OIYxQ \
    --chip-description-path ./u5-targets/STM32U5_Series.yaml

Auto-boot quirk

Stock UNO Q boards ship with the STM32U585’s NSBOOTADD1R option byte set to 0x0BF90000, so reset lands in the chip’s ROM bootloader rather than user flash. probe-rs flashes user firmware correctly, but the chip won’t auto-boot it on reset until NSBOOTADD1R is repointed at 0x08000000. This is a one-time per-board option-byte change; use any STM32 option-byte programming tool.

Flashing and running firmware

Terminal window
$ sudo probe-rs run \
    --probe '0:0:gpiochip1,swclk=26,swdio=25,srst=38' \
    --chip STM32U585OIYxQ \
    --chip-description-path ./u5-targets/STM32U5_Series.yaml \
    firmware.elf
     Erasing ✔ [00:00:01] [#####] 16.00 KiB / 16.00 KiB
 Programming ✔ [00:00:02] [#####] 11.51 KiB / 11.51 KiB
    Finished in 4.7s
[INFO ] firmware booted

probe-rs streams defmt log output over RTT until ^C.