Am Dienstag, den 30.05.2006, 16:24 -0400 schrieb Alain Michaud: > I use one of those (ISA) I/O bards: I write or read from a port and > control a "slow" experiment. More details about the timing:
IMO this is your main problem: the rotten old board. ;) To get away from "dangerous programming" I personally would solve it by using an I/O-Board that drives Interrupts on the host computer. Even cheap ones are able to make 1 ms timing. Another hardware based solution would be to connect a microcomputer board inbetween the computer and the sensor stuff. A little AVR or similar can easily programmed to get one trigger command and then read in values at 1ms timing for 200ms. Afterwards it can transfer data to the host. > THE PROBLEM... > > The problem: the problem is: even if the timing is not so critical and > the the experiment does not last for long, once it has started then the > processor should not leave and go answer the phone for another > process... I think that most process can be delayed for 200ms but my > acquisition loop should NOT be interrupted while it is doing its thing. If the measure is extremely critical, why does the computer have other tasks to do? Can't you use a dedicated machine for the measurement? HTH, Marc _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
