ARM Embedded Tutorial - FPC and the Raspberry Pi Pico

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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....