pico-lcd-base

Basic Raspberry Pi Pico (RP2040) project scaffolding to utilise a WaveShare Pico LCD 1.8in. This repo will likely evolve to be more configurable so as to support general SPI-driven LCD panels.

See the CMakeLists.txt file for further setup instruction.

lcd.c is responsible for initialising and updating the LCD panel.

surface.c is a series of pixel array manipulation functions using a Surface struct which can be passed to lcd_draw_surface() for output to the LCD.

Related Links

• Raspberry Pi Pico (RP2040)

  • https://www.raspberrypi.com/products/raspberry-pi-pico/
  • https://core-electronics.com.au/raspberry-pi-pico-soldered-headers.html
  • https://core-electronics.com.au/raspberry-pi-rp2040-microcontroller.html

• Waveshare Pico LCD 1.8in (C)

  • https://www.waveshare.com/wiki/Pico-LCD-1.8
  • https://core-electronics.com.au/waveshare-1-8inch-lcd-display-module-for-raspberry-pi-pico.html

• Sitronix ST7735S Single-Chip TFT Controller/Driver

  • This is the controller/driver in use on the Pico LCD 1.8in board and is the main reference document for the SPI commands.
  • https://www.waveshare.com/w/upload/e/e2/ST7735S_V1.1_20111121.pdf

Requirements

• pico-sdk (https://github.com/raspberrypi/pico-sdk)
• Dependencies for pico-sdk: cmake gcc-arm-non-eabi libnewlib-arm-none-eabi libstdc++-arm-none-eabi-newlib python3
• Set environment variable PICO_SDK_PATH to your pico-sdk directory
• (Optionally) Set PICO_PLATFORM to rp2040
• Copy /path/to/pico-sdk/external/pico_sdk_import.cmake into project base
• If developing under Windows Subsystem for Linux, follow these extra steps:
  1. Add the following to /etc/wsl.conf:

     [automount]
     options = "metadata"
     enabled = true
     

  2. Restart WSL from an admin command prompt: wsl.exe -t Ubuntu (or Debian)
  3. If CMake still fails, reboot windows

Compiling

• While holding the "BOOTSEL" button on the Pico, plug it in via USB.
• Pico should show up as a USB removable drive.
• Run the following commands to compile and link...

  mkdir build
  cd build
  cmake ..
  make -j9
  

• Copy the artifact main.uf2 to the Pico's USB drive.
• Pico should instantly program itself and reboot, enjoy!