Overview

RP2350-Touch-LCD-2.8

RP2350, USB Type-C

Introduction

RP2350-Touch-LCD-2.8 is a low-cost, high-performance MCU board designed by Waveshare. It features a 2.8inch LCD display, Li-ion battery recharging chip, 6-axis sensor (3-axis accelerometer and 3-axis gyroscope), RTC and other peripherals, making it easy to develop and embed into the product. It can run GUI interface programs such as LVGL smoothly.

Features

RP2350 microcontroller chip officially designed by Raspberry Pi
Adopts 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
Built-in 520KB of SRAM and 16MB of on-chip Flash
Onboard 2.8inch LCD display, 240×320 resolution, 262K color
Supports I2C interface control for capacitive touch, with 5-point touch, and supports interrupts
Adapting USB, UART, I2C and some IO interfaces, integrates full-speed USB port
Onboard speaker, QMI8658 6-axis sensor, RTC clock sensor, TF card slot and battery charging management module, etc.
Drag-and-drop programming using mass storage over USB
Supports accurate control such as flexible clock and multiple power modes to realize low power consumption in different scenarios
USB 1.1 with device and host support
Low-power sleep and dormant modes
Temperature sensor
Accurate clock and timer on-chip
On-chip accelerated floating-point library

Specifications

LCD parameters
Touch Chip	CST816T	Touch Port	I2C
Display Chip	CST328	Display Interface	SPI
Resolution	240(H)RGB x 320(V)	Display Size	43.20 × 57.60 (mm)
Display Panel	IPS	Pixel Pitch	0.18 x 0.18 (mm)

IMU parameters
Sensor Name	QMI8658
Accelerometer Characteristics	Resolution: 16 bits Measuring Range (optional): ±2, ±4, ±8, ±16g
Gyroscope Characteristics	Resolution: 16 bits Measuring Range (optional): ±16, ±32, ±64, ±128, ±256, ±512, ±1024, ±2048°/sec

Pinout Definition

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 VS Code 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
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

Import 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

https://github.com/earlephilhower/arduino-pico/releases/download/4.0.2/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/4.0.2/package_rp2040_index.json

Click Tools > Development 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

Working with C

Directory Structure

├── CMakeLists.txt
├── example_auto_set_url.cmake
├── examples # Demos
│   ├── CMakeLists.txt
│   ├── amoled # Demo of testing AMOLED
│   │   ├── CMakeLists.txt
│   │   ├── amoled_flush_rgb 
│   │   └── amoled_touch 
│   ├── battery_read # Demo of serial port printing battery voltage
│   ├── hello_world # Demo of printing hello world
│   │   ├── CMakeLists.txt
│   │   ├── serial
│   │   └── usb
│   ├── lvgl # Demos using LVGL
│   │   ├── CMakeLists.txt
│   │   ├── factory # Pre-installed demo
│   │   ├── lv_port # Source files for LVGL hardware integration
│   │   ├── lvgl_battery # Demo of using LVGL to display battery voltage value
│   │   ├── lvgl_brightness # Demo of using LVGL to control screen brightness
│   │   ├── lvgl_example # Demo of running LVGL's own demo
│   │   ├── lvgl_image #Demo of using LVGL to display images
│   │   ├── lvgl_pcf85063 # Demo of using LVGL to display time and date
│   │   └── lvgl_qmi8658 # Demo of using LVGL to display IMU data
│   ├── qmi8658_raw_out # Demo of using serial port to print IMU data
│   ├── rtc_pcf85063 # Demo of using serial port to print time and date
│   └── sd_card_spi # Demo for testing SD Card read and write
├── libraries # Library files
│   ├── CMakeLists.txt
│   ├── bsp # Hardware-related libraries
│   ├── lvgl # LVGL library
│   └── no-OS-FatFS-SD-SDIO-SPI-RPi-Pico # TF Card related libraries
├── pico_extras_import_optional.cmake
└── pico_sdk_import.cmake

Compile

If Using the VSCode Raspberry Pi Pico Plugin

Import project, and select project directory

Click Comple to compile

If Using Ubuntu

cd RP2350-Touch-LCD-2.8-Demo/C
mkdir build
cd build
cmake ..
make -j8

Compiled Firmware

After compilation, a .uf2 file will be generated in the build/examples directory

Flash Firmware

Press and hold the BOOT button on the board, connect the board to the USB port of the computer through the Type-C cable, then release the button. The computer will recognize it as a removable drive, and finally copy the compiled .uf2 format file to the removable drive.

New Project

Let's take the example of creating a new project named lvgl_test.
Create a new folder lvgl_test in the examples/lvgl directory and create new CMakeLists.txt and main.c files in this folder.
The content of the CMakeLists.txt file is

add_executable(lvgl_test
    main.c
    ../lv_port/lv_port.c
    )

pico_enable_stdio_usb(lvgl_test 1)
pico_enable_stdio_uart(lvgl_test 0)

# pull in common dependencies
target_link_libraries(lvgl_test 
    pico_stdlib
    bsp
    lvgl
    lvgl::demos)

# create map/bin/hex/uf2 file etc.
pico_add_extra_outputs(lvgl_test)

The content of the main.c file is

#include <stdio.h>
#include "pico/stdlib.h"
#include "bsp_i2c.h"
#include "../lv_port/lv_port.h"
#include "demos/lv_demos.h"
#include "hardware/clocks.h"
#include "bsp_battery.h"
#include "bsp_lcd_brightness.h"

int main()
{
    stdio_init_all();
    bsp_battery_init(100);

    bsp_i2c_init();
    lv_port_init();
    bsp_lcd_brightness_init();
    bsp_lcd_brightness_set(50);

    // lv_demo_music();
    lv_demo_widgets();
    while (true)
    {
        lv_timer_handler();
        sleep_ms(1);
    }
}

Add at the end of CMakeLists.txt in the examples/lvgl directory.

add_subdirectory(${CMAKE_CURRENT_LIST_DIR}/lvgl_test)

Recompile, build/examples/lvgl will add a new folder lvgl_test, which contains the compiled and generated .uf2 files.

Working with MicroPython

Directory Structure

├── examples
│   ├── imu_test.py # Demo of printing IMU data
│   ├── lcd_test.py # Demo of testing LCD
│   ├── lcd_touch.py # Demo of testing LCD and touch simultaneously
│   ├── lv_example.py # lvgl demo
│   ├── rtc_test.py # Demo of printing time and date
│   └── touch_test.py # Demo of testing touch, printing coordinates
├── firmware
│   └── RP2350-Touch-LCD-2.8.uf2 # MicroPython firmware, if you want to use LVGL, you must use this firmware
└── libraries
    ├── imu.py # IMU-related driver
    ├── lcd_2inch8.py # 2.8-inch screen related driver, including display and touch
    ├── lv_port.py # LVGL related
    ├── lv_utils.py # LVGL related
    └── rtc.py # RTC-related driver

Flash Firmware

Press and hold the BOOT button on the board, connect the board to the USB port of the computer through the Type-C cable, then release the button. The computer will recognize it as a removable drive, and finally copy the firmware/RP2350-Touch-LCD-2.8.uf2 file to the removable drive.

Upload Libraries

Open Thonny, click Stop/Restart backend, if the shell below shows the information in the picture, it means the board is connected successfully.

Select libraries, right-click ->Upload to /, and wait for the upload to complete

Run

Open any .py in the examples, click Run current script, and the program will start running

Resources

Supporting Resources

Demo

Demo

Schematic Diagram

Schematic

Datasheets

Official Resources

Raspberry Pi Official Documents

Raspberry Pi Open Source Demos

Development Software

FAQ

Question: What is the pad spacing of the pins?

Answer:

2.154mm

Support

Technical Support

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