ARM Embedded Tutorial - FPC and the Raspberry Pi Pico
The Raspberry Pi Foundation has released the Raspberry Pi Pico, a very cheap Microcontroller board with quite interesting specs.
Introduction
Raspberry Pi Pico Specifications
To best use this tutorial you will need to buy (at least) two Raspberry Pi Pico, we will use one as a target and the second one as a debug probe. Do yourself a favour, invest $4 for a second device, being able to debug is worth so much more.
As the Pico is brand new and support for the board is a work in progress I'd recommend that you set up a dedicated installation of Lazarus and Free Pascal as you will need to use both trunk version of Lazarus and a specially patched version of FPC that includes the necessary adjustments so that FPC knows about the Pico. Also expect changes as we all learn along the way.
Setup
To install the required versions of Lazarus and Free Pascal please see here:
ARM Embedded Tutorial - Installing Lazarus and Free Pascal
PicoProbe
To prepare a PicoProbe and to setup Lazarus please follow this guide:
ARM Embedded Tutorial - Raspberry Pi Pico Setting up for Development
The Examples from Github
To access the examples together with all needed dependencies clone this repository:
https://github.com/michael-ring/pico-fpcexamples
when you find errors in the code or would like to request another demo please enter an issue on github:
https://github.com/michael-ring/pico-fpcexamples/issues
Example Programs
Now we are ready for our first Program, as practice in the embedded programming world we start with blinking the on-board LED:
Blinky
ARM Embedded Tutorial - Raspberry Pi Pico Blinking the onboard LED Not suitable for the Raspberry Pi W
Debugging
The next step in this tutorial is to set up Debugging from within Lazarus
ARM Embedded Tutorial - Raspberry Pi Pico Debugging the onboard LED
The next peripheral to join the party is the UART:
ARM Embedded Tutorial - Raspberry Pi Pico saying Hello via UART
ADC
Time to go Analog:
ARM Embedded Tutorial - Raspberry Pi Pico using the ADC
I2C
Scanning the I2C Bus for Devices:
ARM Embedded Tutorial - Raspberry Pi Pico Scanning for I2C Devices
Talking to a Display via I2C:
ARM Embedded Tutorial - Raspberry Pi Pico using Displays and I2C
SPI
Talking to a Display via SPI:
ARM Embedded Tutorial - Raspberry Pi Pico using Displays and SPI
Building a Pico Compiler
As indicated about, the most common way to get a working Pico compiler is to use fpcupdeluxe but you can, of course, build it yourself Building a Pico Compiler.
Finally
This page is WIP, I received my Boards on 29.01.2021, upgrading it as I go....
From the Free Pascal wiki, page "ARM Embedded Tutorial - FPC and the Raspberry Pi Pico", as it stood on 2024-03-08 after a change by Dbannon, out of the wiki's dump of 2024-05-26. Copyright stays with the author who wrote it, according to the old wiki's Licensing page. If you have concerns about this material, message the admin.