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sporniket / the-cradle-colorlight-i9-ecp5-amaranth-hdl

An implementation of "the cradle" for the ECP5-based colorlight i9 written with the Amaranth HDL
GNU Lesser General Public License v3.0
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Use standard VGA 640x480 instead of PAL 720x576 by default #10

Closed mcclure closed 1 year ago

mcclure commented 1 year ago

Not sure if it's best to relay this information here, on Matrix or elsewhere but—

Got branch 7-does-not-appear-to-build-on-windows built and programmed. The light blinks. However, when I plugged it into a spare Samsung HDMI monitor, I did not see the blinking as expected. The HDMI monitor does react, but it oscillates between a black and a different black with a icon in the top left as if the monitor is rapidly gaining and losing signal. The blink pattern is erratic and not the same as the LED blink rate.

Is this surprising?

https://mastodon.social/@mcc/111155360337843136

sporniket commented 1 year ago

The first thing that comes to mind is the video mode that I selected : 720x576 pixels at 50 Hz (Standard Definition, PAL), and maybe this mode is not supported by all screen ?

However I had prepared another setting for the pll and orchestrator to have a regular VGA 640x480 ; in the-cradle.py : https://github.com/sporniket/the-cradle-colorlight-i9-ecp5-amaranth-hdl/blob/main/src/the_cradle/the_cradle.py#L38-L39

you can try with importing the setting from .vid_settings_640x480_59Hz94 instead of .vid_settings_720x576_50Hz, maybe you will have more luck with your monitor ?

(my monitor could use both settings)

mcclure commented 1 year ago

In 640x480 it works!! Thanks so much. Now that I have a successful test I think I can make any future changes myself.

Video: https://mastodon.social/@mcc/111156530447699355

sporniket commented 1 year ago

Great !

Good to know that the default screen mode I selected is potentially not supported everywere.

I will change to the more standard mode then.