Problem with serial MIDI and samplerbox release 2016-11-14

J
jpg posted Jan 8, 23:04:

Hi
I've just update the img of sampler box on my sdcard with the 2016-11-14 release.
My serial MIDI does not work anymore.
When I plug my keyboard by usb on the samplerbox, it works.

Have you got the same problem?

J
jpg posted Jan 8, 23:13:

Another man with the same problem? http://www.samplerbox.org/forum/219

J
jpg posted Jan 8, 23:19:

Forgot to tell I'm using a rasp 2B

C
Cuki posted Jan 18, 22:02:

I confirm what was also observed by r.meurer (posted Nov 17, 16:53:)

I could make serial MIDI work with samplerbox_20150618.img on RPI 2B

I could NOT make serial MIDI work with samplerbox_20161228.img on RPI 2B or RPI 3

Using USB-Midi interface and Akai LPK25 works with samplerbox_20161228.img on RPI 2B and RPI 3.

H
HansEhv posted Jan 22, 23:57:

Some light in this area: http://www.samplerbox.org/forum/255

N
Nate posted Feb 3, 19:21:

I am having a very very tough time getting the serial MIDI to work. I check all connections, I try different connections, I substitute 6N138 optocouplers of different manufacturers, I swap out Pi boards (2B and 3), I try different codes, .... It looks like everyone and their dog can get this, but I can't-- very frustrating.

The USB MIDI works, so I know for sure that the issue is in the optocoupler configuration. Is it possible to blow the serial port? It never got brought to 5V.

Have I missed anything?

P
Pavel posted Feb 5, 06:17:

The serial port input should be 3.3v when there is no data, supplied through 1k pull-up resistor

N
Nate posted Feb 6, 03:01:

Yep, there's nothing wrong about that.

N
Nate posted Feb 6, 03:02:

Is the diagram on the SamplerBox site wrong?

C
Cuki posted Feb 6, 16:04:

What image do you use?

the diagram works with

samplerbox_20150618.img and RPI2B

N
Nate posted Feb 6, 16:56:

I tried both 2015 and 2016 images.

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