source

pico_ada_c03_led_bar

1.8.0

Chapter 3: Cylon LED Bar: flowing light upgraded to a menacing scanner

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1.8.0

Building a smooth flowing LED bar on the Raspberry Pi Pico with Ada - from a simple chasing light to a proper menacing Cylon scanner effect using real-time delays.

In this chapter we turn ten LEDs into a flowing light bar. We start with the basic Freenove example using an array of RP.GPIO.GPIO_Point (aliased limited tagged types). We then improve it with a pre-calculated sine-harmonic timing table to create a realistic Cylon scanner - all done with Ada.Real_Time and zero floating-point at runtime for perfect jitter-free movement.

Contained in Chapter 03 are:

  1. Sketch_03_1_Flowing_Light - straight port of the classic flowing light
  2. Cylon_Light - the final dramatic Cylon scanner with organic easing
  3. Cylon_Light_Float - Floating point version of Cylon_Light

Read the full tutorial at Chapter 3 - Cylon LED Bar: flowing light upgraded to a menacing scanner, GNATdoc documentation, SourceForge repository

(The Cylons did nothing wrong. Humans created the perfect companion species and then completely messed it up.)

Authors
Martin Krischik <krischik@users.sourceforge.net>
Maintainers
Martin Krischik <krischik@users.sourceforge.net>
Maintainer profiles
@krischik
Licenses
GPL-3.0-or-later
Website
https://pi-ada-tutorial.sourceforge.io/pico_ada_c03_led_bar
Release archive
sourceforge.net/projects/pi-ada-tutorial/files/Alire/pico_ada_c03_led_bar-1.8.0.tgz
Tags
raspberry, pi, pico, rp2040, tasking, light-tasking, ada2022, embedded
Executables
sketch_03_1_flowing_light, cylon_light_float, cylon_light
Manifest
index/pi/pico_ada_c03_led_bar/pico_ada_c03_led_bar-1.8.0.toml
Build and platform metadata 3 fields
Build switches
{
  "*": {
    "ada_version": [
      "-gnat2022"
    ]
  },
  "development": {
    "compile_checks": "Warnings",
    "contracts": "Yes",
    "runtime_checks": "Overflow"
  },
  "release": {
    "compile_checks": "Warnings",
    "contracts": "No",
    "runtime_checks": "Default"
  },
  "validation": {
    "compile_checks": "Warnings",
    "contracts": "Yes",
    "runtime_checks": "Everything"
  }
}
Configuration
{
  "values": {
    "light_tasking_rp2040": {
      "Board": "rpi_pico",
      "Max_CPUs": 2
    },
    "pico_xbsp": {
      "Variant": "tasking"
    },
    "rp2040_hal": {
      "Interrupts": "bb_runtimes",
      "Use_Startup": false
    }
  }
}
Additional origin data
{
  "hashes": [
    "sha256:c3f59a4f81cd5361618b3db1ebc2e4b47226f60f3d3ce3b983cea9061efde9ce",
    "sha512:48c291835ec6f507c3f8571c14d82ecddb9b768695a89d366555e1557fafb30e8af37bb5778a203f131b37042d826446ac49f3d052718ad5497e219062306509"
  ]
}