source

pico_ada_c05_rgb

1.5.2

Chapter 5: Controlling an RGB LED with PWM

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1.5.2

Learn how to drive a common-cathode RGB LED using the RP2040's PWM peripherals. This chapter introduces a reusable Ada package for colour control and demonstrates both random colours and a smooth colour-wheel gradient.

Extend the simple LED examples to full-colour control with an RGB LED. Create a reusable Pico.Analog.RGB_LED package and explore two sketches: random colours (using the embedded runtime) and a smooth colour-wheel transition.

Contained in Chapter 05 are:

  1. sketch_05_1_random_color_light.adb - Chapter 5.1 Random Color Light
  2. sketch_05_2_gradient_color_light.adb - Chapter 5.2 Gradient Color Light

Read the full tutorial at Chapter 5: Controlling an RGB LED with PWM, GNATdoc documentation, SourceForge repository

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_c05_rgb
Release archive
sourceforge.net/projects/pi-ada-tutorial/files/Alire/pico_ada_c05_rgb-1.5.2.tgz
Tags
raspberry, pi, pico, rp2040, tasking, light-tasking, ada2022, embedded
Executables
sketch_05_1_random_color_light, sketch_05_2_gradient_color_light
Manifest
index/pi/pico_ada_c05_rgb/pico_ada_c05_rgb-1.5.2.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": {
    "embedded_rp2040": {
      "Board": "rpi_pico",
      "Max_CPUs": 2
    },
    "rp2040_hal": {
      "Interrupts": "bb_runtimes",
      "Use_Startup": false
    }
  }
}
Additional origin data
{
  "hashes": [
    "sha256:38e197d0eb80efa9b428967aa313841cb733279422a30a19427900b3ff087337",
    "sha512:aad119e7df8f299c57c86c85716d8ce93ec33e9760a50d9879779339bfd8a2368fbef471e8329088e2a2b666ca91c4cc81491d55817a5a463474f0834e1ce4d0"
  ]
}