pico_breadboard_kit

Description

This is Full Demo Code for Pico Breadboard Kit with 3.5" TFT Capacitive Touch Screen

TFT Features

• Resolution: 320x480 Pixels
• Screen IC: ST7796SU1
• Input Voltage: 3.3V
• Touch Type: Capacitive Touch Screen
• TFT screen communication protocol: SPI (SPI0)
• TFT Capacitive touch screen communication protocol: I2C (I2C0 SDA: GP8, SCL: GP9)

Pinout

Components	Pinout
Buzzer	GP13
LEDs	D1: GP16, D2: GP17, D3: 3V3, D4: 5V
RGB LED	GP12
Joystick	X-axis: ADC0, Y-axis: ADC1
Button	BTN1: GP15, BTN2: GP14

TFT screen Pinout

Raspberry Pi Pico	3.5 TFT Screen
GP2	CLK
GP3	DIN
GP5	CS
GP6	DC
GP7	RST

Touch Screen Pinout

Raspberry Pi Pico	Capacitive Touch screen
I2C0 SDA GP8	SDA
I2C0 SCL GP9	SCL

Getting Start

• Install Pico-SDK in Raspberry Pi Assume that you are using Raspberry Pi OS 64bit (Bullseye) as operating system on Raspberry Pi. Here we are using Raspberry Pi 4B as PC to compile the project.

NOTE: Please make sure your Raspberry Pi can access internet and GitHub website. Login to Desktop and open a terminal, typing following command to build Raspberry Pi Pico-SDK environment. These instructions are extremely terse, and Linux-based only. For detailed steps, instructions for other platforms, and just in general, we recommend you see Raspberry Pi Pico C/C++ SDK

1. Install CMake (at least version 3.13), and GCC cross compiler

sudo apt install cmake gcc-arm-none-eabi libnewlib-arm-none-eabi libstdc++-arm-none-eabi-newlib

2. Set up your project to point to use the Raspberry Pi Pico SDK

• Either by cloning the SDK locally (most common) :

  a. git clone this Raspberry Pi Pico SDK repository

  b. Copy pico_sdk_import.cmake from the SDK into your project directory

  c. Set PICO_SDK_PATH to the SDK location in your environment, or pass it (-DPICO_SDK_PATH=) to cmake later.

  d. Setup a CMakeLists.txt like:

  cmake_minimum_required(VERSION 3.13)
  
  # initialize the SDK based on PICO_SDK_PATH
  # note: this must happen before project()
  include(pico_sdk_import.cmake)
  
  project(my_project)
  
  # initialize the Raspberry Pi Pico SDK
  pico_sdk_init()
  
  # rest of your project

• Download Repository

cd /home/pi/
git clone --recursive https://github.com/geeekpi/pico_breadboard_kit.git

• Build Projects

cd pico_breadboard_kit/
mkdir build
cd build/
cmake --no-warn-unused-cli -DPICO_OPTIMIZED_DEBUG=1 -DCMAKE_EXPORT_COMPILE_COMMANDS:BOOL=TRUE -DCMAKE_BUILD_TYPE:STRING=Debug ../
make -j4

• Upload firmware to Pico Unplug Raspberry Pi Pico from Raspberry Pi and press boot_sel button and then connect the Raspberry Pi Pico back to Raspberry Pi. Execute following command to copy the *.uf2 file to Pico.

cp firmware.uf2 /media/pi/RPI-RP2/

After a while, when the firmware has been uploaded to Pico, it will restart automatically, you can test the demo code according to the information on screen. Have fun!

FAQ

• Why is is so slow when I drag the circle ring on screen? Because of the memory of pico is just 264KB, and graphic interface may consume a lot of memory to show the graphic widget.
• Can I use MicroPython with LVGL to drive the screen? No, it is lack of memory, so it may stack when you upload the firmware.