This does not belong directly to the MIOS, but I haven't found a better sub-forum for my question...
I'm trying to learn a lot of the low level stuff associated with MIDI right now. Mostly about USB connection. The svn repo is pretty good for it. I learned a lot of it already... I'm thinking about implementing myself(for learning purposes) a MIDI-USB connection with my STM32f4 dev board. I'm planning to use an ULPI PHY for HiSpeed Connction to achieve lowest latencies(8 times lower latency than FS). I think the Interrupt transfer method should be the best fit for it, since it has guaranteed latency.
But now I saw in the svn repo that the MIDI-USB endpoint descriptor uses only bulk as transfer method.
Is this just for the compability issue or is it a wrong idea to use the interrupt transfer method, to achieve lowest latencies?
Ah just for record, I'm a pretty fussy drummer regarding latencies, since I hear/feel a small difference between 5ms and 10ms(measured and compared by ear...).
Why USB bulk and not interrupt as transfer method?
in MIOS programming (C)
Posted · Edited by phanaton
Hi,
This does not belong directly to the MIOS, but I haven't found a better sub-forum for my question...
I'm trying to learn a lot of the low level stuff associated with MIDI right now. Mostly about USB connection. The svn repo is pretty good for it. I learned a lot of it already... I'm thinking about implementing myself(for learning purposes) a MIDI-USB connection with my STM32f4 dev board. I'm planning to use an ULPI PHY for HiSpeed Connction to achieve lowest latencies(8 times lower latency than FS). I think the Interrupt transfer method should be the best fit for it, since it has guaranteed latency.
But now I saw in the svn repo that the MIDI-USB endpoint descriptor uses only bulk as transfer method.
Is this just for the compability issue or is it a wrong idea to use the interrupt transfer method, to achieve lowest latencies?
Ah just for record, I'm a pretty fussy drummer regarding latencies, since I hear/feel a small difference between 5ms and 10ms(measured and compared by ear...).
Best Regards
Philipp