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Under stress conditions, received MIDI data got lost, and transmitted MIDI data was sporatically corrupted.Īfter some hours I couldn't believe anymore that this was caused by my own code, so I started to debug the transmitting issue first by writing a short program, which just forwards incoming MIDI data to the output port. During the first tests I already noticed that the example code didn't work so stable as expected. So, at a rainy weekend in March 2005 I downloaded the USB framework from the Microchip homepage, installed the USB bootloader (for quick program updates), and integrated the basic MIDI handling code into the CDC example. The USB descriptors for USB MIDI, the MIDI parser, the interrupt handlers for MIDI Rx/Tx were ready to be re-used. Initially the implementation of the firmware was planned as a nice one-day project, as I didn't expect much effort for doing a port of the Cypress based MBHP_USB to the PIC architecture, which I know pretty well. History - MBHP_USB_PIC firmware, first attempt Just add the USB socket, a 470 nF cap, replace the crystal by a 20 MHz type, and add a Reset and Bootloader button.