RP2350-Zero

Overview

RP2350-Zero, A Low-Cost, High-Performance Pico-Like MCU Board Based On Raspberry Pi Microcontroller RP2350.

Hardware

  • RP2350A microcontroller chip designed by Raspberry Pi in the United Kingdom

  • Adopts unique dual-core and dual-architecture design: dual-core Arm Cortex-M33 processor and dual-core Hazard 3 RISC-V processor, flexible clock running up to 150 MHz

  • 520KB of SRAM, and 4MB of on-board Flash memory

  • Uses a modern and convenient USB Type-C connector

  • Castellated module allows soldering directly to carrier boards

  • USB 1.1 with device and host support

  • Low-power sleep and dormant modes

  • Drag-and-drop programming using mass storage over USB

  • 29 × multi-function GPIO pins (20× via edge pinout, others via solder points)

  • 2 × SPI, 2 × I2C, 2 × UART, 4 × 12-bit ADC, 24 × controllable PWM channels

  • Accurate on-chip clock and timer peripherals

  • Temperature sensor

  • Accelerated floating-point libraries on-chip

  • 12 × Programmable I/O (PIO) state machines for custom peripheral support

Supported Features

The rp2350_zero board supports the hardware features listed below.

on-chip / on-board
Feature integrated in the SoC / present on the board.
2 / 2
Number of instances that are enabled / disabled.
Click on the label to see the first instance of this feature in the board/SoC DTS files.
vnd,foo
Compatible string for the Devicetree binding matching the feature.
Click on the link to view the binding documentation.

Pin Mapping

The peripherals of the RP2350 SoC can be routed to various pins on the board. The configuration of these routes can be modified through DTS. Please refer to the datasheet to see the possible routings for each peripheral.

For detailed hardware information, see the RP2350-Zero – Waveshare Wiki.

Default Zephyr Peripheral Mapping:

  • UART0_TX : P0

  • UART0_RX : P1

  • I2C0_SDA : P4

  • I2C0_SCL : P5

  • I2C1_SDA : P6

  • I2C1_SCL : P7

  • ADC_CH0 : P26

  • ADC_CH1 : P27

  • ADC_CH2 : P28

  • ADC_CH3 : P29

Programming and Debugging

The rp2350_zero board supports the runners and associated west commands listed below.

flash debug

Flashing

Using UF2

Here is an example of building the sample for driving the built-in RGB led.

west build -b rp2350_zero/rp2350a/m33 samples/drivers/led/led_strip

You can flash the RP2350-Zero with an UF2 file. One option is to use West (Zephyr’s meta-tool). To enter the UF2 flashing mode just keep the BOOT button pressed while you connect the USB port, it will appear on the host as a mass storage device. Alternatively, with the board already connected via USB you can keep the BOOT button pressed, press and release RESET, release BOOT. At this point you can flash the image file by running:

west flash

Alternatively, you can locate the generated file at build/zephyr/zephyr.uf2 file and simply drag-and-drop to the device after entering the UF2 flashing mode.

References