RP2350-PiZero User Guide

Overview

Introduction

RP2350-PiZero is a high-performance and cost-effective microcontroller board designed by Waveshare. It features a DVI interface, TF card slot and PIO-USB port, and brings out a 40PIN GPIO port compatible with Raspberry Pi. It also reserves one PSRAM pad for easy development and integration into products.

Features

RP2350B microcontroller chip officially designed by Raspberry Pi
Unique dual-core and dual-architecture design, equipped with dual-core ARM Cortex-M33 processor and dual-core Hazard3 RISC-V processor, flexible clock running up to 150 MHz, supporting flexible switching between the two architectures
Built-in 520KB SRAM and 16MB on-chip Flash, with a reserved PSRAM pad
Type-C connector, easier to use
Onboard DVI port, capable of driving most HDMI screens (compatible DVI port required)
Supports using as a USB host or slave via onboard PIO-USB port
Onboard TF card slot for reading and writing TF card
Onboard Lithium battery recharge/discharge header, suitable for mobile devices
USB1.1 host and slave device support
Low-power sleep and dormant modes
Drag-and-drop programming using mass storage over USB
5 × multi-functional GPIO pins
2 × SPI, 2 × I2C, 2 × UART, 2 × 12-bit ADC and 16 × controllable PWM channels
Accurate clock and timer on-chip
Temperature sensor
On-chip accelerated floating-point library
12 × Programmable I/O (PIO) state machines for custom peripheral support

Dimensions

Pico Getting Started

Firmware Download

MicroPython Firmware Download

C_Blink Firmware Download

Basic Introduction

Raspberry Pi Pico Basics

MicroPython Series

Install Thonny IDE

In order to facilitate the development of Pico/Pico2 boards using MicroPython on a computer, it is recommended to download the Thonny IDE

Download Thonny IDE and follow the steps to install, the installation packages are all Windows versions, please refer to Thonny's official website for other versions
After installation, the language and motherboard environment need to be configured for the first use. Since we are using Pico/Pico2, pay attention to selecting the Raspberry Pi option for the motherboard environment

Configure MicroPython environment and choose Pico/Pico2 port
- Connect Pico/Pico2 to your computer first, and in the lower right corner of Thonny left-click on the configuration environment option --> select Configture interpreter
- In the pop-up window, select MicroPython (Raspberry Pi Pico), and choose the corresponding port

Flash Firmware

Click OK to return to the Thonny main interface, download the corresponding firmware library and burn it to the device, and then click the Stop button to display the current environment in the Shell window
Note: Flashing the Pico2 firmware provided by Micropython may cause the device to be unrecognized, please use the firmware below or in the package
- Pico firmware library
- Pico2 firmware library
How to download the firmware library for Pico/Pico2 in windows: After holding down the BOOT button and connecting to the computer, release the BOOT button, a removable disk will appear on the computer, copy the firmware library into it
How to download the firmware library for RP2040/RP2350 in windows: After connecting to the computer, press the BOOT key and the RESET key at the same time, release the RESET key first and then release the BOOT key, a removable disk will appear on the computer, copy the firmware library into it (you can also use the Pico/Pico2 method)

MicroPython Series Tutorials

【MicroPython】 machine.Pin class function details
【MicroPython】machine.PWM class function details
【MicroPython】machine.ADC class function details
【MicroPython】machine.UART class function details
【MicroPython】machine.I2C class function details
【MicroPython】machine.SPI class function details
【MicroPython】rp2.StateMachine class function details

C/C++ Series

For C/C++, it is recommended to use Pico VSCode for development. This is a Microsoft Visual Studio Code extension designed to make it easier for you to create, develop, and debug projects for the Raspberry Pi Pico series development boards. No matter if you are a beginner or an experienced professional, this tool can assist you in developing Pico with confidence and ease. Here's how to install and use the extension.

Official website tutorial: https://www.raspberrypi.com/news/pico-vscode-extension/
This tutorial is suitable for Raspberry Pi Pico, Pico2 and the RP2040 and RP2350 series development boards developed by Waveshare
The development environment defaults to Windows11. For other environments, please refer to the official tutorial for installation

Install VSCode

First, click to download pico-vscode package, unzip and open the package, double-click to install VSCode

Note: If vscode is installed, check if the version is v1.87.0 or later

Install Extension

Click Extensions and select Install from VSIX
Select the package with the vsix suffix and click Install
Then vscode will automatically install raspberry-pi-pico and its dependency extensions, you can click Refresh to check the installation progress
The text in the right lower corner shows that the installation is complete. Close VSCode

Configure Extension

Open directory C:\Users\username and copy the entire .pico-sdk to that directory
The copy is completed

Open vscode and configure the paths for the Raspberry Pi Pico extensions

The configuration is as follows:

Cmake Path:
${HOME}/.pico-sdk/cmake/v3.28.6/bin/cmake.exe

Git Path:
${HOME}/.pico-sdk/git/cmd/git.exe    

Ninja Path:
${HOME}/.pico-sdk/ninja/v1.12.1/ninja.exe

Python3 Path:
${HOME}/.pico-sdk/python/3.12.1/python.exe

New Project

The configuration is complete, create a new project, enter the project name, select the path, and click Create to create the project
To test the official example, you can click on the Example next to the project name to select
The project is created successfully

Compile Project

Select the SDK version
Select Yes for advanced configuration
Choose the cross-compilation chain, 13.2.Rel1 is applicable for ARM cores, RISCV.13.3 is applicable for RISCV cores. You can select either based on your requirements
Select Default for CMake version (the path configured earlier)
Select Default for Ninjaversion
Select the development board
Click Complie to compile
The uf2 format file is successfully compiled

Flash Firmware

Here are two methods for flashing firmware

Flash firmware using the pico-vscode plugin
Connect the development board to the computer, click Run to flash the firmware directly

Flash the firmware manually

1. Press and hold the Boot button
2. Connect the development board to the computer     
3. Then the computer will recognize the development board as a USB device.
4. Copy the .uf2 file to the USB drive, and the device will automatically restart, indicating successful program flashing.

Import Project

Select the project directory and import the project
The Cmake file of the imported project cannot have Chinese (including comments), otherwise the import may fail
To import your own project, you need to add a line of code to the Cmake file to switch between pico and pico2 normally, otherwise even if pico2 is selected, the compiled firmware will still be suitable for pico
```
set(PICO_BOARD pico CACHE STRING "Board type")
```

Update Extension

The extension version in the offline package is 0.15.2, and you can also choose to update to the latest version after the installation is complete

Arduino IDE Series

Install Arduino IDE

First, go to Arduino official website to download the installation package of the Arduino IDE.
Here, you can select Just Download.
Once the download is complete, click Install.

Notice: During the installation process, it will prompt you to install the driver, just click Install

Arduino IDE Interface

After the first installation, when you open the Arduino IDE, it will be in English. You can switch to other languages in File --> Preferences, or continue using the English interface.
In the Language field, select the language you want to switch to, and click OK.

Install Arduino-Pico Core in Arduino IDE

Open the Arduino IDE, click on the file in the top left corner, and select Preferences
Add the following link to the attached board manager URL, and then click OK
This link already includes board versions such as RP2040 and RP2350. Please visit arduino-pico for the latest version files
```
https://github.com/earlephilhower/arduino-pico/releases/download/4.5.2/package_rp2040_index.json
```
Note: If you already have an ESP32 board URL, you can use a comma to separate the URLs as follows:
```
https://dl.espressif.com/dl/package_esp32_index.json,https://github.com/earlephilhower/arduino-pico/releases/download/4.5.2/package_rp2040_index.json
```
Click Tools > Board > Board Manager > Search pico, as my computer has already been installed, it shows that it is installed

Upload Demo at the First Time

Press and hold the BOOTSET button on the Pico board, connect the pico to the USB port of the computer via the Micro USB cable, and release the button after the computer recognizes a removable hard disk (RPI-RP2).
Download the program and open D1-LED.ino under the arduino\PWM\D1-LED path
Click Tools --> Port, remember the existing COM, do not click this COM (the COM displayed is different on different computers, remember the COM on your own computer)
Connect the driver board to the computer using a USB cable. Then, go to Tools > Port. For the first connection, select uf2 Board. After uploading, when you connect again, an additional COM port will appear
Click Tools > Development Board > Raspberry Pi Pico > Raspberry Pi Pico or Raspberry Pi Pico 2
After setting it up, click the right arrow to upload the program

If issues arise during this period, and if you need to reinstall or update the Arduino IDE version, it is necessary to uninstall the Arduino IDE completely. After uninstalling the software, you need to manually delete all contents within the C:\Users\[name]\AppData\Local\Arduino15 folder (you need to show hidden files to see this folder). Then, proceed with a fresh installation.

Open Source Demos

MircoPython video demo (github)
MicroPython firmware/Blink demos (C)
Raspberry Pi official C/C++ demo (github)
Raspberry Pi official micropython demo (github)
Arduino official C/C++ demo (github)

Demo

C Demo

01-DVI

The demo is modified based on Wren6991 PicoDVI

Main Directory Analysis

apps directory: demo source code
assets directory: original images and image header files
include directory: default pin configuration header files
libdvi directory: DVI driver source code
libgui directory: GUI source code

Hello DVI Demo Description

Hello DVI demo is located in the hello_dvi file under apps directory
Scroll through a 320x240p RGB565 test image in 640x480p 60Hz DVI mode

Gui Demo Description

Gui Demo is located in gui demo file under apps directory
Display white, red, yellow, green, cyan, blue, purple, black, and then the GUI image in 640x480p 60Hz DVI mode

02-USB

The demo is modified based on sekigon-gonnoc Pico-PIO-USB

Main Directory Analysis

examples: source code of the demo
src: source code of the PIO-USB driver

capture_hid_report Demo Description

capture_hid_report demo is located in capture_hid_report file under examples directory
PIO-USB will serve as a USB host for receiving and printing HID reports sent by USB devices

usb_device Demo

usb_device demo is located in the usb_device of the examples directory
PIO-USB will be emulated as a mouse and move the mouse cursor every 0.5s

Host_hid_to_device_cdc Demo

Host_hid_to_device_cdc demo is located in the Host_hid_to_device_cdc of the examples directory
Host_hid_to_device_cdc is similar to capture_hid_report, printing a mouse/keyboard report from the host port to the CDC of the device port

03-MicroSD

Main Directory Analysis

tests: source code used for tests
FatFs_SPI: MicroSD related driver source code

Demo Description

Using a terminal tool such as putty or mobaxterm, open the USB serial port corresponding to the RP2350-PiZero
Type Enter and the following message will be displayed
```
>
```
Enter help command to get the available commands as follows

setrtc <DD> <MM> <YY> <hh> <mm> <ss>:
  Set Real Time Clock
  Parameters: new date (DD MM YY) new time in 24-hour format (hh mm ss)
	e.g.:setrtc 16 3 21 0 4 0

date:
 Print current date and time

lliot <drive#>:
 !DESTRUCTIVE! Low Level I/O Driver Test
	e.g.: lliot 1

format [<drive#:>]:
  Creates an FAT/exFAT volume on the logical drive.
	e.g.: format 0:

mount [<drive#:>]:
  Register the work area of the volume
	e.g.: mount 0:

unmount <drive#:>:
  Unregister the work area of the volume

chdrive <drive#:>:
  Changes the current directory of the logical drive.
  <path> Specifies the directory to be set as current directory.
	e.g.: chdrive 1:

getfree [<drive#:>]:
  Print the free space on drive

cd <path>:
  Changes the current directory of the logical drive.
  <path> Specifies the directory to be set as current directory.
	e.g.: cd 1:/dir1

mkdir <path>:
  Make a new directory.
  <path> Specifies the name of the directory to be created.
	e.g.: mkdir /dir1

ls:
  List directory

cat <filename>:
  Type file contents

simple:
  Run simple FS tests

big_file_test <pathname> <size in bytes> <seed>:
 Writes random data to file <pathname>.
 <size in bytes> must be multiple of 512.
	e.g.: big_file_test bf 1048576 1
	or: big_file_test big3G-3 0xC0000000 3

cdef:
  Create Disk and Example Files
  Expects card to be already formatted and mounted

start_logger:
  Start Data Log Demo

stop_logger:
  Stop Data Log Demo

Arduino Demo

01-DVI

The demo is modified based on Wren6991 PicoDVI

Hello Dvi Demo Description

Hello Dvi demo is located in the Hello Dvi directory
Scroll through a 320x240p RGB565 test image in 640x480p 60Hz DVI mode

02-USB

The demo is modified based on sekigon-gonnoc Pico-PIO-USB

Install Dependency Library

This demo should be used with the Pico PIO USB library, the specific installation steps are shown below:

Install Pico PIO USB library
Select "Install All"
Installation successful
Change USB Stack configuration

device_info Demo Description

device_info demo is located in the device_info directory
PIO-USB will serve as a USB host for receiving and printing descriptor information of USB devices
After successfully uploading the program, open the serial monitor, connect the USB device, and press the "RUN" button to restart the RP2350-PiZero

Core1 setup to run TinyUSB host with pio-usb
Device attached, address = 1
Device 1: ID 05ac:0256
Device Descriptor:
  bLength             18
  bDescriptorType     1
  bcdUSB              0110
  bDeviceClass        0
  bDeviceSubClass     0
  bDeviceProtocol     0
  bMaxPacketSize0     64
  idVendor            0x05ac
  idProduct           0x0256
  bcdDevice           0310
  iManufacturer       1     CX
  iProduct            2     2.4G Wireless Receiver
  iSerialNumber       0     
  bNumConfigurations  1
TinyUSB Dual Device Info Example

03-MicroSD

Demo Description

Insert TF card, run the demo, and enable writing data to the TF card

Hello, world!
V2-Version Card
R3/R7: 0x1aa
R3/R7: 0x40ff8000
R3/R7: 0xc0ff8000
Card Initialized: High Capacity Card
SD card initialized
SDHC/SDXC Card: hc_c_size: 30475
Sectors: 31207424
Capacity:    15238 MB
Goodbye, world!