Serial Midi in/out

Design Concepts
1

How to plug a MIDI device to a MIDIbox with MIDIbox-to-COM Interface

This could work with the MIDI Merger project. To use the Merger as a baudrate converter, just change following lines in the MIDI Merger source code:

;; code located in init.inc, function: Init_USART:

;;

       SWITCHBANK_0_1

       movlw   (1 << TXEN)     ; set baudrate: 31250

       movwf   TXSTA

       movlw   0x09

       movwf   SPBRG

       SWITCHBANK_1_0

must be changed to:

       SWITCHBANK_0_1

       movlw   (1 << TXEN) | (1 << BRGH) ; set baudrate: 38400

       movwf   TXSTA

       movlw   0x20

       movwf   SPBRG

       SWITCHBANK_1_0

On this way, the Hardware UART is clocked with 38400 baud, but the software UART runs with the MIDI baurate anymore. Following interconnections are necessary:

MIDI In1 of the merger to MIDI-Out of the MIDI device (i.e. a MIDI Keyboard)

MIDI In2 of the merger directly - without optocoupler - to the output of the MAX232 (Pin 12)

MIDI Out of the merger directly - without optocoupler - to the Rx port of the MIDIbox-PIC.

Its the bit at the end I don’t understand… does this mean it is possible to create a serial midi interface to use with any generic midi device? or does it mean that only a midi serial input (output not possible?) can be created by combining the midi-merger project, and the MAX232?

thanks, from Steve

2

Hi Steve,

or does it mean that only a midi serial input (output not possible?) can be created by combining the midi-merger project, and the MAX232?

correct, a second output which runs with MIDI baudrate cannot be realized with the merger.

Best Regards, Thorsten.

3

Thanks for the reply, Thorsten!  ;)

handy for a controller keyboard, I guess!