Dear all,
i'm trying to do some register level
programming for a PCI-6602 card. I need to generate three synchronized
PWM-Signals with variable duty-cycle which look somehow like this:
1. Channel
0____1------2-------3____4
2. Channel
_______----------_______
3. Channel
_________------________
( _ low; - high, 0-4 time)
A
period T is defined from 0 to 4, half the period from 0 to 2, from 0 to
1 the counter should count down and toggle the output-pin at 1, the
same should be done from 2 to 3. These definition might sound funny,
but if used for every channel, they guarantee minimised switching
losses for the converter. From 1 to 2 and from 3 to 4 the counter
should keep the current state.
Now I would like to ask the following questions:
1.
Is it possible to synchronize the three counters ? The counters need to
start at the same time. How do I have to configure the counters to
achieve this ? Is it enough to choose the same "Selected Source" ?
2.
In the 660x Register-Level Programmer Manual there is some talk about
four available load registers. Load A and Load B in two X and Y bank
cells. What is the sequence, in which the values stored in the register
are loaded into the counter ?
3. How do I access the
registers ? The Register Maps-Chapter tells me about four Load A
Registers, since there are 8 counters, shouldn't there be at least 16
Load A Registers (two X and Y bank cells) ?
4. At 4 I
need to trigger an AD-Conversion ? Can you recommand me an
PCI-DAQ-Card, which is able share the trigger via the RTSI bus ?
Thanks a lot,
Nico
