Event triggered square-wave
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hi,
I generate square wave signal with this ;
freq_Hz = 30;
t = 0:0.0001:10;
y = square(2*pi*freq_Hz*t);
plot(t,y);
axis([0 10 -1.5 1.5]);
xlabel('Seconds');
ylabel('Amplitude');
But I want to trigger each duty cycle with an external event. Like this in pseudo ;
for i:1:100
if event1=1
pwm(i) = high
if event2=0
pwm(i) = low
plot(i,pwm)i)
but can't interfere to square function.
I am sure experienced users will provide some insight.
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Antworten (1)
Walter Roberson
am 22 Nov. 2011
I just wrote several paragraphs with specific references to why it cannot be done. You deleted the question out from underneath me, so my write-up was lost. This is frustrating to say the least. So you can dig the reasoning out yourself, and you are lucky I still had the documents in my cache.
4 Kommentare
Walter Roberson
am 23 Nov. 2011
The LTC2485CDD normally runs at a maximum of 60 Hz, though there seems to be a "2x speedup mode" possible with it. You will not be able to obtain 300 Hz with it.
MATLAB has no facilities to blink the screen.
PTB3 claims up to 2 KHz sample rate (12 bit) sample rate with a Measurement Computing USB-based interface; see http://docs.psychtoolbox.org/Daq
What is the maximum frame rate for your display? It was never very common to find a CRT with higher than 85 Hz (except for the 120 Hz stereo modes), and most LCD are 60 Hz or lower. CRT often require a notable time to reconfigure to different frame rates (which often require resolution changes), and on most monitors the workable frame rates are a fairly small list. If you have an especially forgiving monitor sometimes you can design custom front porch timings and the like to fine-tune frame rates; Linux does seem to be the OS to use for that kind of work, but it can be tricky work and risks monitor damage if you get it wrong; a high level of attention to detail is necessary. Custom video formats pretty much have to be designed in advance.
Switching video formats using the official mechanisms is not a light-weight change, as the X11 driver has to be notified of the changes and reconfigures its ideas of your screen sizes, perhaps repositions your icons, etc.
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