RP2350-Touch-LCD-2.8C User Guide

Overview

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

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 of SRAM and 16MB of on-chip Flash
Onboard 2.8inch LCD screen with 480×480 resolution
Supports touch control via I2C interface, with interrupt support
Supports USB1.1 host and slave device
Low-power sleep and dormant modes
Drag-and-drop programming using mass storage over USB
Onboard QMI8658 6-axis sensor, RTC clock sensor, TF card slot and battery charging management module, etc.
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

Specifications

LCD parameters
Display Panel	IPS	Display Size	2.8inch
Display Resolution	480 × 480	Contrast	1200:1
Communication interface	RGB	Display IC	ST7701
Touch Port	I2C	Touch IC	GT911

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 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

Working with C

Directory Structure

├── CMakeLists.txt
├── example_auto_set_url.cmake
├── examples # Demos
│   ├── CMakeLists.txt
│   ├── adc_battery # Demo of serial port printing battery voltage
│   ├── button # Demo of obtaining BOOT button status
│   ├── buzzer # Demo of driving buzzer
│   ├── gui # Demo of using GUI library to display content on LCD
│   ├── hello_world # Demo of printing hello world
│   │   ├── CMakeLists.txt
│   │   ├── serial
│   │   └── usb
│   ├── lcd # Demo of Testing LCD
│   │   ├── CMakeLists.txt
│   │   ├── lcd_flush_rgb
│   │   ├── lcd_image
│   │   └── lcd_touch
│   ├── lvgl # Demos using LVGL
│   │   ├── CMakeLists.txt
│   │   ├── factory # Pre-installed demo
│   │   ├── lv_port # Source files for LVGL hardware integration
│   │   ├── lvgl_example # Demo of running LVGL's own demo
│   │   ├── 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 TF Card read and write
├── libraries # Library files
│   ├── CMakeLists.txt
│   ├── Fonts 
│   ├── GUI
│   ├── 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-2.8C-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
    lvgl_test.c
    ../lv_port/lv_port_disp.c
    ../lv_port/lv_port_indev.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)

target_compile_definitions(lvgl_test PRIVATE
    PICO_EMBED_XIP_SETUP=1
)
# 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_disp.h"
#include "../lv_port/lv_port_indev.h"
#include "demos/lv_demos.h"

#include "hardware/pll.h"
#include "hardware/clocks.h"
#include "hardware/structs/pll.h"
#include "hardware/structs/clocks.h"

#define LVGL_TICK_PERIOD_MS 10
void set_cpu_clock(uint32_t freq_Mhz)
{
    set_sys_clock_khz(freq_Mhz * 1000, true);
    clock_configure(
        clk_peri,
        0,
        CLOCKS_CLK_PERI_CTRL_AUXSRC_VALUE_CLKSRC_PLL_SYS,
        freq_Mhz * 1000 * 1000,
        freq_Mhz * 1000 * 1000);
}

static bool repeating_lvgl_timer_cb(struct repeating_timer *t)
{
    lv_tick_inc(LVGL_TICK_PERIOD_MS);
    return true;
}

int main()
{
    static struct repeating_timer lvgl_timer;
    set_cpu_clock(240);
    stdio_init_all();
    bsp_i2c_init();
    lv_init();
    lv_port_disp_init();
    lv_port_indev_init();
    add_repeating_timer_ms(LVGL_TICK_PERIOD_MS, repeating_lvgl_timer_cb, NULL, &lvgl_timer);

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

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.

Resources

Supporting Resources

Demo

Demo

Schematic Diagram

Schematic

Datasheets

Official Resources

Raspberry Pi Official Documents

Raspberry Pi Open Source Demos

Development Softwares

FAQ

Question: GPIO is configured as a pull-down input, why does reading IO show a high voltage level when the pin is left unconnected?

Answer:

You can refer to the RP2350-E9 section in the RP2350 Datasheet

Support

Monday-Friday (9:30-6:30) Saturday (9:30-5:30)

Email: services01@spotpear.com

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