switcher Directory Reference

Effect switching system based on uMIDI.

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Files
file	config.c
	Device configuration.
file	config.h [code]
	Device configuration header.
file	main.c
	Entry point and main loop of the uMIDI firmware.
file	switcher.c
	Implementation of the MIDI switcher module.
file	switcher.h [code]
	MIDI switcher module API.

Detailed Description

Effect switching system based on uMIDI.

Features

• 5 true-bypass loopers
• 2 general purpose switches
• Tuner output
• 3 9V outputs connected to 6 barrel jacks
• 12V input via barrel jack

Control panel

There are nine illuminated momentary switches on the control panel:

• 1x Mute/Tune (red)
• 5x Looper (green)
• 2x Switch (blue, small)
• 1x Save (red, small)

Except for the "Save" button, the switch LED is synchronously switched with the corresponding relais. It is possible to hard-wire these LEDs to the switch PCB's inputs. The "Save" button should blink to indicate unsaved changes.

Repository

A repository with a KiCad project for the PCB is located at https://github.com/theFork/uMIDI-switcher.

Software Specification

There are two modes, the

• macro mode in which the switcher enters programs according to received program change packets and the
• micro mode which allows controlling the separate relays using control change packets.

Macro mode

Event: MIDI packet received

• If it is a program change:
  • Load corresponding program
  • Flash save LED once
• Else:
  • Flash save LED twice

Event: Hard-Wired-Switch pressed

• Toggle corresponding output
• Save current program to temporary variable
• Compare to currently active program in the EEPROM. If there a diff:
  • Enable blinking of the save LED

Event: Save Switch pressed

• If current program modified (save LED is blinking):
  • Save program after pressing the switch a little longer (approx. 1.5s)
    • Confirm save with fancy blink pattern
  • Enter micro mode when detecting two short taps
• Else:
  • Enter micro mode

Micro mode

In micro mode the save LED is constanty on.

Event: Hard-Wired-Switch pressed

See macro mode? Use to cycle through programs? Or send some MIDI packets?

Event: MIDI packet received

TODO

Event: Save Switch pressed

• Enter macro mode
• Keep current configuration (i.e. the save LED blinks due to a modified program)