More questions about custom asynchronous device

I am trying to create a custom asynchronous device for VeriStand and have the following questions:

(a) at what rate entered in the course of analysis and data channel pushed into the FIFO of the custom device entry? The scanning speed depends on if the input channel is mapped to a control of workspace object or if it is mapped to an output of the simulation model (.dll file)?

(b) at what rate the VI real-time asynchronous custome device running? Is it at the same rate as the primary control loop rate? Can I change the rate of implementation of a custom device and how?

(c) I have a quad-core PXI time real platform. How can I connect the device customized to a specific processor, like what you do with a simulation model (.dll file) in the definition of system file?

Thank you in advance.

Data FIFO

The rate at which data are pumped on your meter is static and has nothing to do with the question of whether the workspace is connected, or if a model is mapped to one of your channels. By default, data are pushed in input of your Custom FIFO each iteration of the loop of primary control. If the FIFO is full, the oldest data packet is crushed. In addition, by default, outings THAT FIFO is controlled ever iteration of the loop of primary control. You can, however, use the NI VeriStand - Set custom decimation of device to mark a property on your customized device that will tell the system its decimation expected in the. If you set a decimation of 10, for example, the primary control loop will be send every 10 iterations of new data and check for new data out FIFO only every 10 iterations. This can help reduce the load of the processor in your system if you do not need updates that often.

Similarly, you can use the NI VeriStand - Set of deep FIFO to control the depths of the FIFO of your entries and exits FIFO respectively. By default, both have depth 1.

Delivery rate

The rate at which your custom device runs depends on how set you up. You can for example, having your Custom asynchronous device uses its own schedule and run at a pace totally independent of the system. Your VI could have regular while loop with a 10ms timer, for example, or it could be based off some hardware device timing.

Alternatively, you can choose yourself closely synchronize with the primary control loop. This by registering using a property that your Custom device has a timed loop that will use the clock of the device. The unit's clock is a source of synchronization that is checked each iteration of the loop of primary regulation after Custom peripheral FIFO have been updated. You sign up for this simply by calling the NI VeriStand - Set loop property Type specifying Timed loop to loop type and use peripheral clock be true. Then, as the VI model, thread just the clock of the camera in your calendar input source for the timed loop. If you have specified a decimation factor, as mentioned above, you should probably also to use this factor as your dt. This means that if you have a decimation of 10, you only run your timed loop 10 all the graduations of the source of synchronization clock of the device.

Another simple way to synchronize closely with the primary control with a few problems loop is simply base your timing off the coast of the availability of new data in your entries or exits FIFO. To do this, you can simply use regularly to loop and then just wire - 1 for FIFO wait times. Then your custom device will run as soon as the data are produced and consumed by the system.

Specification of a processor

There is no property integrated for the allocation of the processor, but it will be very easy for you to implement yourself. You can specify the processor to run on in the Explorer system by creating a custom using NI VeriStand - property set the property of the element. For example, you could define a property of I32 entitled 'Treatment', with-2 meaning auto-affectation and any non-negative value indicating an index of specific processor. Set this property in one of your device in System Explorer configuration pages and then read the property in VI of pilot in the engine using NI VeriStand - get the property of the element. Then just wire up the value of the property at the entrance of affinity processor on your timed loop. However, you should always check that this processor is on target. Otherwise the timed loop will report an error and abort. It's exactly what we do for models in-house.

Tags: NI Products

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