How do I?

June 19, 2013, 06:04:00 pm

I am trying to figure out the wires and protocol for a little LCD I have. From what I can see using my open logic sniffer, it appears to be SPI. My problem is that I can only see about 2 or 3 bytes, then I run out of memory. There is a ton of space between each byte and I was wondering if it's possible to trigger on a condition, then stop recording on a second trigger, and then repeat so I can just see all the bytes instead of just the first 2 or 3.

Re: How do I?

Reply #1 – June 19, 2013, 11:36:12 pm

Hi Jdraughn,
are you using the RLE compression already?
Also selecting only one group of channels (8 channles, well 7 with RLE) should enable you to have longer traces.
Selecting a lower capture frequency can also help if possible.

There is also support for some quite advanced triggers, especially in FPGA bitstream 3.07 version, but I don't know if they are/will be fully supported in the OLS client. Do have a look at the complex triggers options in the java OLS client (I have version 0.9.6.1) that allows you to set parallel or serial triggers and in several stages.

Also if you have a clock signal among the captured pins, as it is the case for SPI, you might try using that clock to trigger capturing each sample using the external clock option.

What software and hardware OLS versions are you using?

Regards,
tkg