PCIe 6535 and legacy interface

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Hari Patel
Hari Patel 2012-6-26
I am using PCIe 6535 to get 12 Bits of digital data and 3 sync signals to my computer @ rate of 9 MHz.
I am using MATLAB 2010a (32 bit).
my code:
digital_in = digitalio ('nidaq','Dev1');
addline(digital_in,0:7,'in',{'Bit1','Bit2','Bit3','Bit4','Bit5','Bit6','Bit7','Bit8'});
addline(digital_in,0:6,1,'in',{'Bit9','Bit10','Bit11','Bit12','VD','HD','DCLK'});
digital_bits = getvalue(digital_in.Line(1:12));
digital_bits_decimal = binvec2dec(digital_bits);
VD = getvalue(digital_in.Line(13));
HD = getvalue(digital_in.Line(14));
DCLK = getvalue(digital_in.Line(15));
This is what i did so far. Now I want to get these data to my computer @ 9MHz speed. I check MATLAB help but I didn't find anything that specifies speed for legacy interface (PCIe 6535). I want to save 25 seconds of digital data @ 9 MHz rate.
My problem is how to specify speed and timing in the MATLAB using legacy interface because my device (PCIe 6535) only supports legacy interface.

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回答（1 个）

Rob Graessle
Rob Graessle 2012-6-26
The GETVALUE function in the legacy interface is asynchronous, so it is designed to read one set of values at a time. To acquire multiple values in a row (without regard for timing), you could call GETVALUE inside of a loop. However, if you want to specify a rate at which values are acquired, you could change the TimerFcn and TimerPeriod properties of the digital IO object. For example, if you set TimerPeriod to 0.1 and include a call to GETVALUE inside the TimerFcn callback, a new sample will be acquired every 0.1 seconds. A good example is available in the documentation - just type edit demodaq_callback at the MATLAB prompt. Note, however, that since this uses software-clocked DIO and not hardware-clocked DIO, the acquisition rate will be limited by the speed of your computer and OS.

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