FPGA: unable to update the timer on fpga through host.

Hi all

I worked on FPGA project. It has several loops paralel and works with some sampling time.

I would like to change the "timing" on a single loop, it is called loop output. I would like to slow down the loop so that the loop will update the output less frequently. (see attachment - red circle)

I modified the code by changing the timer by the host. (see attachment - blue circle).

I did several things such as:

1. Add a manual switch that allows me to change the time of sampling mode normal (same time of polling with other loops) in manual mode (set the timer number).

But it did not work all the time. I checked the value on the host, it is always on the same sampling time, even I write the value of the timer to measure.

2. I changed the strategy by putting the other control connected directly to the timer (without switch) in the loop so that I can change the value directly. However, there is still no luck. The result is not reliable. It sometimes slows down and many are in the same pace as before.

3. I even put a case in front of the exit structure so it was only updated after sometimes (all 100 or more loops). It is not always useful. I see the speed varies, but it is not as expected.

The material is piezo readers/engine. But I want to slow down the speed, does not increase the speed. Thus, it should not be a problem.

I really appreciate if there are any comments or suggestions.

Kind regards

Areku

Hi all

After consulting with my supervisor, he advised me to spend on intermediate or new control value first. Then, update the value of the control that is connected to the timer loop with this intermediate control value. It will update the value of the timer loop after loop (when intermediary value received from the host and update control connected to the timer loop). It works fine now.

I don't know exactly the mechanism labview of drafting or updating the fpga through host value. But, it seems to me, in my case, there was a problem of writing a value to the control that is connected to the loop timer where ran in relatively fast. Well, little control ignore/reject the new value because it is busy to execute the loop in high speed.

Thanks again for the response to my post, GerdW.

Kind regards

Areku

Tags: NI Software

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