Packet Inspection: How to find 5 different packets?

[Exle]

Hi,

I want to inspect I2C traffic. In my traffic are 5 different packets. I want to detect them and if all are detected I want to leave the VI with a TRUE. If not, I want a timeout and a FALSE as return.

Everything works, except the evaluation. Basically my VI should do the following:

Inspect DATA

{

     If Condition 1 found, set bit 1

     If Condition 2 found, set bit 2

     If Condition 3 found, set bit 3

     If Condition 4 found, set bit 4

     If Condition 5 found, set bit 5

     ++ repetitions

}

If bit1 AND bit2 AND bit3 AND bit4 AND bit5: return TRUE

If repetitions > 100: return FALSE

repeat

My problem is: How can I set a bit and keep it set? Let's say, I find Condition 1 and set it. In the next iteration I find condition 2 and set bit 2. But, in the same iteration, Condition 1 is not to be found and so bit 1 is cleared again. So I never achieve, that all bits are set.

I hope I could make myself clear and would be happy about any solutions. I am on labview base, so no access to events.

kind regards,

Christian

[GerdW · Accepted solution]

Hi Exle,

how do you forward data from one iteration of a loop to the next?

The buzzword here is "shift register"!

So you would store your conditions with

IF (condition1 is found) OR (condition1-flag) THEN (set condition1-flag to TRUE)

[Exle]

Hi,

thanks, it's working. But it is really complicated compared to a simple "if (condition) bit0 = 1".

What are kudos for?

Christian

[GerdW]

Hi Christian,

it's just a little bit more complicated than "if condition =1" because your term is "if condition = 1 OR condition has been TRUE before"...

There are easier ways to check your 5 conditions: