Jump to content

Midi Merging with several inputs, bidirectionnal


silicium
 Share

Recommended Posts

Are the state machines for midi merge described somewhere at midi message level ? I would like a better midi merge box with COM I/O to PC (to have two merged MIDI inputs and one output on any PC, using compatible baud rate of 38400, with at least one COM port but without using USB). I plan to use a double UART like SCC2692 and external RAM or asynchronous FIFO chips, at least twice larger than PIC18 internal RAM, and have not chosen the target microcontroller yet (PIC or 8052). How are working the ringbuffers of MM ? I don't need to filter content, not interested in the MidiRouter design.

Link to comment
Share on other sites

Buffer size can be an issue with multiple SysEx strings at the (multiple) inputs. Yet, this is rather an academic problem...

Best regards, ilmenator

Yes, have to agree. Buffer size is not likely to be a real problem, but I guess it depends what one plans to use the interface for. Personally, whenever I am going to send much sysex data (bulk dump, firmware update, etc), I will make sure that there is no other midi trafic at that time.

I am currently planning to make a midi merger with a few more I/Os, to go with the USB midi chips currently being ordered in the bulk orders forum. I will most likely use one PIC24Fxxx for each merger unit. These PICs have 4 hardware UARTs, and I will probably use one or two software driven UARTs as well. I don't imagine RAM limitations will be an issue, as midi is a rather low data rate, and being real time, one should not be buffering a great deal of data anyway.

If/when I finish my design, I will make it available online. However, I'm pretty sure that existing solutions would be able to meet your requirements, unless you are planning a different kind of usage from what I am expecting to be the way that most people use midi.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
 Share

×
×
  • Create New...