ecp5_evn example doesn't work

[podhrmic]

The provided ECP5 example runs only for a few seconds, and then gets stuck (no more LED movement) as shown in the video below. Tested on two different eval boards, with the latest Yosys, netxprtr and prjtrellis versions. Am I missing something in the example that needs to happen?

https://drive.google.com/file/d/1DxMFrxwb7LuZHveqQ4cLank8fDfldTex/view?usp=sharing

[gatecat]

I remember this is something to do with the FTDI going into sleep and shutting off it's clock, unfortunately, I can't remember what the solution I found was.

[podhrmic]

@gatecat thanks for the pointer. Switching to the internal oscillator clock fixed the problem!

From the Lattice demo I copied:

wire          osc_clk;        // Internal OSCILLATOR clock
defparam OSCI1.DIV = "128";
OSCG OSCI1 (.OSC(osc_clk));

And then used osc_clk instead clk in the demo and all works.