Why ni845xDioReadLine takes several milliseconds to run?
I use a USB-8451 to communicate with a device of RM3000 using the SPI protocol. My program uses 'base' 8451 C API. The RM3000 has a DRDY line which goes high when the requested data are available. This is connected to port 0, line 0 the 8451 dio interface.
When I use ni845xDioReadLine to check the DRDY line after having written a command and before reading the response, the call of ni845xDioReadLine takes several milliseconds to execute. The DRDY line is always already high because the ni845xDioReadLine call takes so long.
You expect the appeal ni845xDioReadLine take as long? The DRDY would check using the "Advanced" version of the call of ni845xDioReadLine script be faster? I'm hoping to read a 200 Hz and need to minimize the time of transaction to achieve this sampling rate.
I am able time glancing SPI transactions on a scope and looking at the order and time of response with and without the call of ni845xDioReadLine commented.
Any help would be appreciated.
Thank you.
Hi IntAndTest,
Yes, script often improve performance because it allows the programmer to manage the measures that are being taken. In turn, this allows to eliminate steps that the screw top level, run and manage it for you and which may not be necessary depending on the application. "There are examples of scripts in the Finder of the example, in input and output hardware' I2C and SPI" Advanced of SPI or I2C Advanced. It is also possible that higher speed, USB port having not made a difference, but the only real way to know would be to try a USB 2.0 port to your request.
Hope this helps,
Jen W
Technical sales engineer
National Instruments
NI.com/support
Tags: NI Hardware
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Hi GRL999,
Welcome to the Microsoft Answers site.
You can add, delete, enable, or disable a startup program in windows 7. Follow the steps mentioned below.
Method 1:
1. open the settings menu of the program.
2. Add the program to the startup -
Select the type option to run at startup of the program.
3. to remove the startup - program
Deselect the option type to run at startup of the program.
Method 2:
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4. to add a startup program or file shortcut - drag the shortcut created in step 1 in the startup folder and drop it.
5. to remove a boot program or file shortcut - right click on the shortcut in the startup folder and click Remove.
6. close the startup folder when finished.
For all users:
NOTE: The startup folder all users is a hidden system folder:
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3. click on all programs, right-click on the Startup folder and click open all users , or to explore all users.
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5. to remove a boot program or file shortcut - right click on the shortcut in the startup folder and click Remove.
6. close the startup folder when finished.
Method 3:
1. open the Start Menu.
(A) in the search line, type msconfig and press enter.
or
(B) open theControl Panel (all items view) and click the Administrative Tools icon, and then click System Configuration. Close the control panel and the windows administrative tools.
2. If prompted, click on continue for UAC prompt or type the administrator password.
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4. to disable a startup - program
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(B) repeat to disable more listed startup programs.
5. to allow a startup - program
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6. to turn off all startup programs listed -
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(B) proceed to step 9.
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8. click on apply and OK.
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Thanks and regards.
Thahaseena M
Microsoft Answers Support Engineer.
Visit our Microsoft answers feedback Forum and let us know what you think. -
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fpefpe
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Ornrylilsuker,
Click on the link below and try the USB drivers for your number of bits:
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