PicoScope 7 Software
Available on Windows, Mac and Linux
MIDI MESSAGES
MIDI MESSAGES
Hi,
I'm currently working on a project where I am looking at MIDI messages.
I am successfully seeing the data and the decoder is working fine.
The data is transmitted in 3 X 8bit packets. the scope sees these and collects them into a buffer.
The problem I am having is when the buffers are transmitted close to each other I am losing data.
I can see the the first buffer but not the second.
If I alter the settings I can see the two buffers being transmitted but they have poor definition and are not decoded correctly.
I have attached 2 traces, the first shows correctly decoded buffer the second shows 2 buffers transmitted with a 80ms delay between.
Any ideas ?
Woody
I'm currently working on a project where I am looking at MIDI messages.
I am successfully seeing the data and the decoder is working fine.
The data is transmitted in 3 X 8bit packets. the scope sees these and collects them into a buffer.
The problem I am having is when the buffers are transmitted close to each other I am losing data.
I can see the the first buffer but not the second.
If I alter the settings I can see the two buffers being transmitted but they have poor definition and are not decoded correctly.
I have attached 2 traces, the first shows correctly decoded buffer the second shows 2 buffers transmitted with a 80ms delay between.
Any ideas ?
Woody
- Attachments
-
- 2_BUFFERS.psdata
- 2 buffers no detail
- (8.68 KiB) Downloaded 611 times
-
- 1_TRACE_DECODE.psdata
- single buffer
- (8.78 KiB) Downloaded 595 times
Re: MIDI MESSAGES
I would try increasing the requested number of samples at the top of the screen to as high as possible. Set it to 2GS and it will use the highest possible that the device can support, and make sure that slow sample transition (Tools->Preferences->Sampling) is set to 100ms/div so the trace is drawn live scrolling from the left.
Martyn
Technical Support Manager
Technical Support Manager
Re: MIDI MESSAGES
Thanks Martin,
That's getting the data now.
I tried increasing the number of samples but not the transition time.
Regards
Woody
That's getting the data now.
I tried increasing the number of samples but not the transition time.
Regards
Woody
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CinemaPete
- Newbie
- Posts: 0
- Joined: Wed Mar 10, 2021 2:08 pm
Re: MIDI MESSAGES
Hello, I'm new to this forum: My interested is in the MIDI protocol and I see that it's possible to capture MIDI messages using a Picoscope even though the MIDI protocol is not listed in the protocols list. May I ask what scopes (is it model specific?) can do this and how are you capturing MIDI if it's not explicitly listed as a protocol? Thanks.
Re: MIDI MESSAGES
If you open the trace decode psdata file from the original post you will see how the decoding is performed using a generic decoder.
Martyn
Technical Support Manager
Technical Support Manager
Re: MIDI MESSAGES
It was done with the low budged 2204A scope, so any scope in the pico range can decode this.
Benno
Benno