Help, MIDI data dumps

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1 total messages Started by Ric Peregrino Mon, 11 Mar 1991 23:05

#8184

Author: Ric Peregrino
Date: Mon, 11 Mar 1991 23:05

20 lines
1235 bytes

  Concerning MIDI sample data dumps:

  I have an A2000 1.3 with a program to send and receive MIDI sample
data dumps. It's not pretty, but I'd like to make it so. The ugliness
is that I Disable/Enable around a RBF (TBE for send) polling loop, thus
taking over the machine. What I would like to do is have a RBF interupt
service routine that **DOESN'T MISS A BYTE**. Sending is not a problem.

  The problem is MIDI 31250 BAUD; 8bits, 1 start, 1 stop; 320uS/data.
So I've got to get the data and be ready for the next data in 320uS.
The question I pose is how long (in CPU clock cycles) does it take
from a RBF interupt to when my service routine gets control of CPU,
in the worst case (I guess you need the operating system source code
to answer this). I noticed the hardware priority for the RBF is 6;
can any other interupt override this? If so, all hope is lost.

ric@hpspd

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