hello,
in my application an external digital signal should generate
an interrupt in order to synchronize an output to a motor.
The interrupt service routine just has to increase a counter
and wakeup the measurment process if needed. My PCL818 daq
board, however, triggers an ADC on the external signal, and
THEN issues the interrupt, i.e. the frequency is limited to
120kHz, because the conversion time is approximately 8us.
(rtl still works, tested with the toggle of an analogue output
with a P200, with an interrupt latency of 4.5us +-1us)
The frequency is high enough, but during the measurement the
ADC is occupied and interferes with the external interrupt
generation scheme due to the board characteristics. Of course,
I could buy a board, in which the daq path and the external
interupt generation path are separated, but..
Now the question: Could I use the serial or parallel port at
this speed with a deterministic latency between the external
signal and the interrupt generation, or is there a better
solution?
peterw
--
Dr. Peter Wurmsdobler
CTM - Centre de Transfert des Microtechniques
39, av. de l'Observatoire, BP-1445, 25007 Besancon CEDEX 3
TELEPHONE: +33 3 81 47 70 20 TELECOPIE: +33 3 81 47 70 21
E-mail: [EMAIL PROTECTED]
Ceterum censeo MIRCOSOFTem esse delendam.
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