lhondareyte / MIDI-Panic

MIDI Panic device based on Microchip 12C508 or 16F84

MIDI Panic

MIDI Panic module based on MICROCHIP PIC12C508 or 16F84. To build the firmware, checkout GNU Pic Utilities, then :

cd src && make

Construction

The panic device can run as a standalone module :

Or be include in an existing device. Eg. a MIDI Thru-box:

About the 16F84A

The 16F84A version require a 4MHz external oscillator. If you want run the device with internal oscillator (not recommanded), add the USE_INTERNAL_OSC flag in Makefile:

ASMFLAGS="-w1 -D HAVE_RUNNING_STATUS -D USE_INTERNAL_OSC"

The pinout for the 16F84A version is as follow:

S1       = pin 6  (PORTB-0)
S2       = pin 7  (PORTB-1)
S4       = pin 8  (PORTB-2)
MIDI IN  = pin 18 (PORTA-1)
MIDI OUT = pin 1  (PORTA-2) 

Example of connection

Switchs configuration

• If no switch is active (S1 or S2), the panic device act as a passthrough device.
• If S1 is active, the panic device send a Note Off message for each note (from 0 to 127). It take several seconds to complete.
• If S2 is active, the panic devise send a All Sounds Off message. Some old sound generators may not understand this mesage but it take less than 10ms to complete.
• S3 prevents unintentional actions on S1 or S2.
• If S4 is active (connect to ground), the Panic device use the Running Status to shorten Note Off messages. It as no effect with the All sounds Off message.