[dorkbotpdx-blabber] Arduino MIDI Library help needed

[Greg Borenstein]

I haven't used it for send yet, but the send case is actually much  
easier than the receive case (you don't have to setup a callback  
function). My code so far is pretty much just exactly his sample for  
receive (I'm triggering a drum-playing solenoid from MIDI).  
Eventually, once I get more solenoids, I'll do different things  
depending on the channel, but right now, I'm just doing the hello  
world of flashing an LED on with noteon and off with noteoff.

-- Greg

On Mar 31, 2009, at 10:49 AM, Hans Lindauer wrote:

> I did end up asking the programmer who wrote the library for help  
> yesterday, and he said:
>> Okay, here's the begin method for input and thru enabled:
>>
>> MIDI.begin(MIDI_OPTO_ON | MIDI_OPTO_EXT | MIDI_THRU_ON);
>>
>> The problem with this function is the optocoupler, most people will  
>> power it directly, but I liked the idea to cut the power from a pin  
>> on the Arduino.. It may cause more problems than it brings  
>> solutions, so I will remove it on the next upgrade (you're not the  
>> first to have troubles with this function).
>>
>>
>> Then, inside your code, at some moment when you want to check if  
>> there are any available MIDI messages:
>>
>> if (MIDI.thru(InputChannelNumberHere) == true) {
>>   // get the informations with getType, getData...
>> }
>>
>> MIDI.thru will first read the serial port and check for a MIDI  
>> message. If any, it will be mirrored on the output. Then a channel  
>> filter is applied to keep only messages that came from the channel  
>> you listen to, and if the message matches this condition, it  
>> returns "true", and you can get the message data.
>>
>>
>>
>> I will try to make some examples for the next release..
> That makes it clear enough.  However, when I re-read the Playground  
> page, it says, "You can send and receive messages of (almost) all  
> kind (System messages are not currently supported)."  When I read  
> that before, I thought that it meant Sysex messages, but I think it  
> actually means what it says, which is that it doesn't it doesn't  
> handle start/stop/reset/clock, etc.  (My own janky code handles  
> those, it just ignores program changes or whatever the other one is  
> that uses three-byte messages.)
>
> Greg's suggestion looks a lot better to me, I like how he doesn't  
> assume that you've studied computer science.  I can actually follow  
> his instructions.
>
>
> Jesse Mejia wrote:
>> Have you used that library for send and receive or just receive?
>>
>> As someone who is looking at using arduino+midi (but hasn't gotten  
>> my hands dirty yet) could you and/or hans give a brief rundown of  
>> the problems to look for in either or both of those two libraries?
>>
>> Hans - did you have luck last night?
>>
>> -Jesse
>>
>>
>> On Mar 31, 2009, at 9:13 AM, Greg Borenstein wrote:
>>
>>> I don't know if you had any success with the Arduino MIDI library  
>>> last night, but I've been working with this alternate library  
>>> recently:
>>>
>>> http://timothytwillman.com/?page_id=240
>>>
>>> and I've found it much preferable. It lets you define callback  
>>> functions that will be invoked on the occurrence of different midi  
>>> events (noteOn, noteOff, etc).
>>>
>>> It makes receiving midi, especially, a lot easier that the default  
>>> lib.
>>>
>>> -- Greg
>>>
>>>
>>> On Mar 30, 2009, at 1:40 PM, Brian Richardson wrote:
>>>
>>>> heh, if you had phrased the question like that yesterday I would  
>>>> have actually looked at the MIDI Library.  It looks like it's  
>>>> trying to follow the pattern of the Serial object.  So you should  
>>>> basically emulate that a bit.  I'll be at the meeting tonight and  
>>>> I'll try to help you out.
>>>>
>>>> Brian (the dude in the grey hat)
>>>>
>>>>
>>>> Or if somebody who's familiar with C programming wants to sit  
>>>> down with me for like 10 minutes tonight at the meeting, I'm sure  
>>>> it's obvious what to do.  "look at the reference page to learn  
>>>> how to use it, " it says on the website.  Um, OK.
>>>>
>>>> http://www.arduino.cc/playground/Main/MIDILibrary
>>>>
>>>> Thanks,
>>>> -Hans
>
> _______________________________________________
> dorkbotpdx-blabber mailing list
> dorkbotpdx-blabber at dorkbot.org
> http://music.columbia.edu/mailman/listinfo/dorkbotpdx-blabber