MIDI meger with more tha 2 Ins

[ilmenator]

Hi all,

the MIDI merger proposed by Thorsten is limited to 2 MIDI Ins. Is this limitation due to processing speed issues (reading: might be overcome by using a faster (18F452) processor), or is this due to hardware limitations?

Regards, ilmenator

[TK.]

Hi Ilmentator,

both: hardware limitations and processing speed. Every software implemented MIDI In requires a pin which can trigger an interrupt, and this interrupt must be processed within ca. 1-10 uS, otherwise the serial data could get lost if multiple MIDI transmitters are sending data at the same time. The PIC shouldn't do anything else than listening to the ports. Therefore I would avoid more than one software implemented UART, this solution:

http://www.midibox.org/cgi-bin/yabb/YaBB.cgi?board=concepts;action=display;num=1046743910

is much better.

Best Regards, Thorsten.