[dorkbotpdx-blabber] (2nd try) Programming Help Needed Please

[Donald Delmar Davis]

Hans,

Since you are only passing the data through without processing it you  
should intercept and retransmit the bytes in the serial interrupt  
routine.

In wiring_serial.c

change
	unsigned char c = UDR0;
to
	unsigned char c = UDR0;
#ifdef WIRING_ECHO_SERIAL
	UDR0 = c; //write c back to the Usart Data Register for transmission.
#endif

and #define WIRING_ECHO_SERIAL=1 somewhere.

To do it right you should class serial or create a new core, its a bit  
invasive but its actually what you really want here.

Don.




On Apr 5, 2009, at 11:07 AM, Hans Lindauer wrote:

> Let's try this again, without the attachments.  You can find them at  
> the provided link.
>
> ----- Forwarded Message ----
> From: Hans Lindauer <armatronix at sbcglobal.net>
> To: dorkbotpdx-blabber at dorkbot.org
> Sent: Sunday, April 5, 2009 10:41:47 AM
> Subject: Programming Help Needed Please
>
> OK, I have (hopefully) one line to program to finish my re-write of  
> my MIDI lights firmware.  It's the line that modifies the MIDI  
> library so that it passes any incoming bytes to the THRU port.
>
> In my old program, I just did a Serial.read follower by a  
> Serial.print, as follows:
>
> void loop () {
>   if (Serial.available() > 0) {
>     newbyte = Serial.read(); // read the incoming byte
>     Serial.print(newbyte); // echo the incoming byte
> ...
>
> I tried that again here, but with no luck.  Then I looked at how  
> they send data to the serial port for MIDI OUT in the library, and  
> saw that they use a slightly different syntax: serial_.print (b,  
> TYPE).  So I tried adding that instead, as follows.  I've included  
> an extra snippet that shows how they're doing it, for context.  My  
> line is the one with the asterisks.  I assumed that I could ignore  
> the type argument, since I'm just passing the (int) variable c  
> straight thru.  (I also tried it as INT and BYTE types):
>
>
> // Try to read data at serial port & pass anything read to  
> processing function
> void Midi::poll(void)
> {
>     int c;
>
>     // Just keep sucking data from serial port until it runs out,  
> processing
>     //  MIDI messages as we go
>     while((c = serial_.read()) != -1) {
>         recvByte(c);
>         serial_.print(c); // ***** pass MIDI data THRU *****
>     }
> }
>
>
> // Send Midi NOTE OFF message to a given channel, with note 0-127  
> and velocity 0-127
> void Midi::sendNoteOff(unsigned int channel, unsigned int note,  
> unsigned int velocity)
> {
>     int status = STATUS_EVENT_NOTE_OFF | ((channel - 1) & 0x0f);
>
>     if (sendFullCommands_ || (lastStatusSent_ != status)) {
>         serial_.print(status, BYTE);
>     }
>
>     serial_.print(note & 0x7f, BYTE);
>     serial_.print(velocity & 0x7f, BYTE);
> }
>
>
> If it helps to see the full library code from http://timothytwillman.com/?page_id=240 
> , it's attached (this snippet is in midi.cpp).  Please let me know  
> if you have any ideas.  By the way, this MIDI library seems to work  
> pretty well otherwise (with only one light).
>
> Thanks,
> -Hans
> _______________________________________________
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