MIDI footswitch controller with four SPDT buttons. Supports MIDI OUT for controlling other devices and MIDI IN to teach buttons what MIDI commands should be send. Two LEDs indicate current processes.
Teaching is simple, connect other device's MIDI OUT to MIDI IN of footswitch controller, trigger signal on the other device (LED2 will indicate that our controller got the signal) and push one of the buttons and it'll accociate the button with MIDI command.
MIDI IN and MIDI OUT schematics should be based on 3.3V (not 5V) as usual.
Latest versions of yosys, icestorm, nextpnr and iverilog packages
are needed.
Compilation:
make ice40
Uploading is done through my Banana PI (Raspberry PI alternative), I copy the bitstream using ssh to BPI, and I use flashrom to write the bitstream to the flash chip on dev board. The command does all that:
make upload_ice40
Look for any detals in Makefile. Tested on Arch Linux.
Footswitches are 3-pin SPDT, center pin goes to GND, other pins go to pins
in GPIO, look which pins to use in ice40/ice40hx1.pcf. To determine physical
locations of pins the iCE40HX1K-EVB schematic will be needed, which can be found
here.
pip install cocotb
make check
For simulation install gtkwave package and run make check with TESTCASE
option. TESTCASE is a name of function in tests/test_midi_ctrl.py.
After that run:
gtkwave tests/midi_ctrl.vcd