Duggle's Blog

When interfacing a Joystick, Modwheel or Pitchbender it is sometimes found that the voltage range on the potentiometer output is well inside   the range of the Core ADC input.This can often be overcome with digital calibration in the firmware (e.g MIDIbox KB) in some cases there is extreme loss of resolution.Presented here is a circuit to overcome this to...

http://midibox.org/f...4.jpg  Abstract This article documents the hardware and software mods to provide 2 extra (4 total) Midi I/O ports on the MB SEQ4L.  The added ports use the onboard UARTs (2,3) of the LPC MIOS32 core. The underlying sequencer code supports these ports (MIDI 3 and 4), but in the case of MIDI 3, the pins...

Abstract Discussion of the problems limiting the length of SRIO chains.Some causes of signal integrity problems in transmission lines are mentioned.A Working solution is presented.Introduction  The problems limiting the length (physical length and the number of chips connected) of DOUT shift registers has been canvassed Discussion thread  during the devel...

Simple keyboard zones Rather than have the whole keyboard output the same midi channel (hence same sound) we may want to have "left hand ->Bass" and "right hand -> Treble" parts. This is accomplished by having a "zones" in this case upper and lower parts of the keyboard separated at a certain note on the keyboard ("spli...

This is what worked for me:1) Download and install openocd 0.2.0 (earliest version after 0.1.0 available as prebuilt *.msi. Btw, 0.1.0 is preferred for compatibility with the mios provided scripts)2) In Program Files\OpenOCD\0.2.0\drivers is a folder contained in ft223.zip, unpack this folder to a temporary location.3) Attach the JTAG key t...

http://midibox.org/f...40_57_31027.jpg Jaycar is an electronic component retailer in Australia.They have stores in many locations and for this reason are a convenient source of parts.The QP5518 (Jaycar's cat. number) is 2x16 yel/grn LED backlit display.It is pin compatible with the Core32 EXCEPT VDD AND VSS NEED TO BE S...