NEITHER USB-8452 - reach the maximum write SPI speed

Hello

I have a USB-8452 with the latest version of the software installed (2.1.2). The host computer is a Core i7. I am trying to achieve the maximum SPI write speed with the camera possible. I tried the basic block read/write SPI, SPI Scripting blocks and SPINNAKER streaming, but the first two have large delays between CS falling and the data being written (with so that delays in loop), and the last seems to be useful only for read operations.

Can someone tell me if there is a way of a) reduce the time of installation for basic SPI / SPI Scripting or b) writing different values in a single stream of SPI? Thanks in advance for any help on this issue, even if it's just confirmation that yes they is hard limits that cannot be overcome with the LabVIEW 8452 interface at this time.

Here's the best I can do right now, as shown in my logic analyzer. Change of the SPI clock speed does not affect installation time and delays that are primary and secondary bottlenecks:

SPI read/write database-

Program: Basic Configuration followed by read/write of SPI block itself in a while loop

Main bottleneck: ~ 450 delay us into iterations of the loop (see Figure 2)

Secondary bottleneck: ~ 6 us delay between falling edge of CS and the first synchronization signal (see Figure 1)

Capture 1 - delay highlighting between CS falling and first SCLK pulse

2 delay highlighting between all iterations of the loop of capture

 

 

Scripts of SPI-


Program: Followed two Script blocks Basic Configuration run in a while loop (to check the two block to block and delay loop iteration)


Main bottleneck: ~ 450 delay us into iterations of the loop (see Figure 3, space between the second and third images captured)

Secondary bottleneck: ~ 250 us delay between blocks of Script run consecutive (see Figure 3, space between the first and second captured images)

Capture 3 - highlighting delays consecutive run the Script and delays between while the loop iteration


SPI in Streaming- It's the closest to achieve a fast writing speed, but unfortunately, it seems to be only useful for read operations (e.g., ADC), do not write.

Program: Configuration of the base stream followed by start of the flow block

Main bottleneck: impossible to write something else than the data value unique property "wave 1-> MOSI data." I can write a byte array to this property, but it will simply put all these bytes in an image and repeat this framework (see Figure 4) rather than go through each value.

 

4 - two bytes sent repeatedly using SPI capture stream. Delay of CS is finally good, but no possibility to change the MOSI image to image data.

Hi JBender1,

This show looks like what we would expect for a 8452.

If you need higher performance, I encourage you to watch using a card R or FlexRIO FPGA series for your implementation.

Tags: NI Hardware

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