Increase sampling rate with CW-Lite

1

Hello, is there any way I could increase the sampling rate to x8 or x10?? I see that the thing I can do is to set "scope.clock.clkgen_freq ", but the relative sampling rate is always x1 or x4. Besides, every time I set "scope.clock.clkgen_freq " to a different value the capture does not work (I get ack errors or trigger errors).

Thanks in advance,
Asier Zubeldia

2

No, x1 and x4 are the only possible options.
If you change scope.clock.clkgen_freq, you must change target.baud accordingly, e.g.:

target.baud = 38400 * scope.clock.clkgen_freq /  7.37e6

That’s because the UART is run from the clock, so if the clock speed is doubled, then the UART baud rate doubles too.

Jean-Pierre

3

Understood! Thanks a lot;)

4

This is what happens when I change the baud rate

image
image1116×234 10 KB

5

What does scope.clock show? What is your target? Possibly you’ve gone over its maximum allowed frequency?

6

I have the XMEGA target and i’m trying to set clock_gen to 25MHz and clock_adc to 100MHz. Actually a can set tem both, but then capture fails.

7
  1. What is the output of scope.clock?
  2. Are you able to communicate with the target if clkgen_freq is slower?
8

This is what I get:
image

The ack error is always there, it doesn’t matter what clk_gen I choose. The only time when does not give error is when I don’t change it.

9

What baud rate are you communicating at?