martoni / hdmicore

HDMI core in Chisel HDL

Own chisel projects

Project	version	Chisel version
fpgamacro	6.2.1	6.2.0
WbPlumbing	6.2.4	6.2.0
chisNesPad	6.2.0	6.2.0
HdmiCore	6.2.0	6.2.0

hdmicore's Issues

Synthesizing with yosys fails (missing OSER10)

Trying to synthesize the generated Verilog with yosys fails:

$ yosys -p "read_verilog TangNano9k.v; synth_gowin -json TangNano9k.json"
...
2.2.2. Analyzing design hierarchy..
Top module:  \TangNano9k
Used module:     \PatternExample
Used module:         \HVSync
Used module:     \HdmiTx
Used module:         \Oser10Module
Used module:         \Rgb2Tmds
Used module:             \TMDSEncoder
Used module:     \Gowin_rPLL
ERROR: Module `\OSER10' referenced in module `\Oser10Module' in cell `\osr10' is not part of the design.

Cannot Run Synthesis

I got an error while running synthesis

ERROR (CV0013) : Pin(buffDiffGreen_O) of '_O_tmds_data_p_T[0]'(TLVDS_OBUF) does not connect to port("/b/Projects/fpga/sipeed/HdmiCoreGW/TangNano4k.v":583)
ERROR (CV0013) : Pin(buffDiffGreen_OB) of '_O_tmds_data_n_T[0]'(TLVDS_OBUF) does not connect to port("/b/Projects/fpga/sipeed/HdmiCoreGW/TangNano4k.v":584)

Generated TangNano4k.v
as attachment.

I am using Gowin FPGA Designer Version 1.9.8.02, sbt 1.6.1, fpgamacro master/Oct 20

I am a newbie with FPGAs, would you please help.

Awesome Project!

Hi Fabien, I got my Tang Nano 4K today and just tried out your project. Works flawlessly!
Thanks you so much for putting this together!

Once the yosys/nextpnr flow catches up and we can drop the GoWin IDE, this is going to be an awesome board.

Feel free to close this issue once you see it. Just wanted to say thank you.

Black screen on Elgato Cam Link 4K and generic HDMI to UVC adapter

Hi,

Thanks for sharing this project! I'm currently running it on the Tang Nano 9k and it works great on my HDMI LCD monitor, but I can't get it to show anything on HDMI capture devices. I have tried with an Elgato Cam Link 4K, as well as a generic HDMI to UVC adapter: https://www.adafruit.com/product/4669 (these are all over ebay/aliexpress too)

On the Cam Link is an LED which indicates that it is capturing, and when I connect the Tang Nano the LED remains off. Also, when I connect the device to a HDMI switcher, it doesn't detect that a video input has been connected. On the generic UVC adapter, it seems like I just get a black screen, though I am unsure exactly if it can detect the video stream or it just outputs a black screen by default.

Have you tested this on any HDMI capture devices? I haven't modified the project at all, I just followed the instructions in the readme, then built and flashed it with the gowin IDE and openFPGAloader. FWIW, I also flashed the picotiny example which comes with the Tang Nano 9k, and it also fails to capture.