Advanced Trigger for Logic Analyzer

[Manny]

Im trying to capture 60ms worth of data from a very noisy device.
On those 60ms there are 57 interesting bits that I need, but they come only immediately after a specific sequence.

The sequence preceding my interesting bits is as follow:

------------------------
One low pulse between 2.0 and 2.3 ms
Four high and low pulses in a row, each of them 0.61 ms high or low.
------------------------

the problem is that the signal is very noisy, and there are many low pulses around of 2 to 2.3 ms, so my trigger fires in the wrong places.

Is there a way to configure Logic for a complex trigger? (for example, one that only fires after the specific sequence).

see a sample data below, with a zoom-in on the interesting part I want to capture.

 

[attila]

Hi @Manny

Press Alt+F11 in WaveForms main window before opening the Logic Analyzer.
With the Advanced button configure the following trigger. 

This will wait for the line to be at least 2ms stable (no edge on DIO-0), then after the following rising edge (pulse 610us/2) it will start sampling the line (deserialize) at 610us intervals and trigger if it reads AA (10101010) pattern.

To have a more restrictive match for the pulse length set the bit to 152.5us (610/4) and look for 32 (4*8) positions with 0xF0F0F0F0, "11110000111100001111000011110000" pattern.

 

[attila]

Hi @Manny

Could you send a project with some captured data?

[Manny]

32 minutes ago, attila said:

Hi @Manny

Could you send a project with some captured data?

Here you go.

The interesting sequence starts at about position: 47.80701s

RF433Temp.dwf3logicacq

RF433Temp.dwf3logic

[Manny]

11 hours ago, attila said:

Hi @Manny

Press Alt+F11 in WaveForms main window before opening the Logic Analyzer.
With the Advanced button configure the following trigger. 

This will wait for the line to be at least 2ms stable (no edge on DIO-0), then after the following rising edge (pulse 610us/2) it will start sampling the line (deserialize) at 610us intervals and trigger if it reads AA (10101010) pattern.

To have a more restrictive match for the pulse length set the bit to 152.5us (610/4) and look for 32 (4*8) positions with 0xF0F0F0F0, "11110000111100001111000011110000" pattern.

 

I have to be doing something wrong.

I try and try to select the second box and cannot. I keep modifying the first one.
How do you move to the second box? I restarted the software many times>
Looks like I did it once, but not I cannot repeat it.

[Manny]

2 hours ago, Manny said:

I have to be doing something wrong.

I try and try to select the second box and cannot. I keep modifying the first one.
How do you move to the second box? I restarted the software many times>
Looks like I did it once, but not I cannot repeat it.

My bad,, you need to press "RESET" to set up the second condition.
For whatever reason it sounded counterintuitive in my head, but I get it now.

I will test this tonight and report back.

[Manny]

On 4/16/2018 at 5:55 AM, attila said:

Hi @Manny

Press Alt+F11 in WaveForms main window before opening the Logic Analyzer.
With the Advanced button configure the following trigger. 

This will wait for the line to be at least 2ms stable (no edge on DIO-0), then after the following rising edge (pulse 610us/2) it will start sampling the line (deserialize) at 610us intervals and trigger if it reads AA (10101010) pattern.

To have a more restrictive match for the pulse length set the bit to 152.5us (610/4) and look for 32 (4*8) positions with 0xF0F0F0F0, "11110000111100001111000011110000" pattern.

 

Works perfect.

Ill use the same technique with other patterns.

 

Thanks a lot!