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HDMI and Beagle Board

Denis Gleeson
Prodigy 10 points

Other Parts Discussed in Thread: TPS65950, TFP410

Hi Guys

 

Basic question. We have to drive video onto a new Phillips LCD TV.

It has several HDMI inputs which would be ideal. Can I get this format from the Beagle board or will I need a convertor of some type?

Thanks

Denis

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  • TI__Mastermind 41665 points

    The Beagle board can output 720p from its integrated HDMI connector so you can probably connect it directly to your LCD TV with a HDMI cable, you should not need an adapter. If you were to do this with the Mistral EVM you would need a DVI->HDMI adapter. Just a note, there is a lot of activity in the Beagle community at the groups page and IRC through beagleboard.org, though posting here is fine, once you get into some specific open source software you may find more insight from the Beagle specific community.

  • in reply to Bernie Thompson TI
    Prodigy 10 points

    Unless I happen to have totally misunderstood (please make it so :-) the connector is of HDMI type but the signal is DVI-D and unless your TV has a DVI input you do need some conversion. That is if you want 720p, Beagle board does have a s-video connector and your TV probably have that also but Then you'll only get SD-tv

  • in reply to Anders Sahlman
    TI__Mastermind 41665 points

    What you say has some truth, but DVI-D and HDMI are interchangeable as long as the display supports the format (resolution/timing). It is possible that your TV may or may not support the format coming out of the HDMI connector, the U-Boot starts with a 720p output which the TV will likely accept, but depending on what you run on the Beagle the output format may change, for example the Angstrom demo loads up the display as 1024x768 which is more commonly a PC resolution, though many TVs will still accept it. This being said, as opposed to buying a converter, you would actually have to modify the kernel you boot to use the resolution and timings your display needs.

    Technically the HDMI on the Beagle is not fully HDMI and more like DVI-D because it is missing the audio portion and because it is not HDCP encrypted, but the digital video part is the same between the two which is why DVI<->HDMI adapters exist. The HDMI<->DVI adapters out there do not do any format conversion, it is just a physical connector change, rerouting the digital video signals from one connector to the other.

  • in reply to Bernie Thompson TI
    Prodigy 20 points

    Bernie,

    I am actually planning to use the Mistral EVM (OMAP3530-based) as the basis of my design. My requirement is to provide true HDMI (video+audio). Encryption is not needed and in fact is not desirable (to reduce complexity). I am totally new to the world of digital video/audio. Can you suggest a solution to get HDMI out of OMAP-based board? My application is a portable video inspection device: Image Sensor + Microphone -> OMAP + TPS65950 -> HDMI Out

    Thank you.

  • in reply to Eldar
    TI__Mastermind 41665 points

    Eldar said:
    Can you suggest a solution to get HDMI out of OMAP-based board?

    This is possible, however it would require a third party HDMI transmitter, which I do not believe TI carries, it cannot be done with the on board TFP410 used on the EVM and several other OMAP3 development boards, thus it would require custom hardware at a minimum. There is a good thread on this topic on the Beagle list here, which suggests a Sil9022.