Problem on HDMI when Porting Pynq-Z1 to Zybo Z7-20

Support
1

I could successfully create a custom image for Zybo-Z7-20 board. The custom image is created based on Pynq-Z1 image version 2.5. Basically, the base.bit are composed of all block design from Pynq-Z1 base overlay, except the audio, arduini, and chip kit parts.

All of the based overlays (such as LEDs, Switches, Buttons) are working properly unless the HDMI overlay.

When i test the custom image using example code hdmi_introduction.ipynb , i got following result:

hdmi_in.configure()
hdmi_out.configure(hdmi_in.mode)

out: <contextlib._GeneratorContextManager at 0xae8999f0>

After hdmi_in.start() and hdmi_out.start() the computer blinks but no video signal is detected.

When I try to run hdmi_in.readframe() , this error is shown: RuntimeError: DMA channel not started .

Do you have any suggestion regarding this problem?

2

What does your setup look like? Any more information that we should know, like resolution and any adapters?

3

Thank you for your reply. The Zybo-Z7 HDMI input is connected to the HDMI port of my Laptop without adapter while the HDMI output port of Zybo-Z7 is directly connected to FullHD Monitor. I got HDMI input frame resolution of 1920x1080 pixels when i run print(hdmi_in.mode).

HDMI-error
HDMI-error1127×762 158 KB

4

This might be a similar problem as Something Weird: HDMI cannot write frames continuously

From there we don’t know the best answer. There are many things you need to adjust for your zybo.