Reading EDID of display and programming o/p timing generation

sweta bhatt

Hi,

I have a query regarding HDMI Display.

Is it possible to read the recommended frame rate out of the displays EDID and use this information for output timing generation ?

If yes, any idea, how this can be achievable in DM816x ?

Regards,
Sweta

over 13 years ago

0 HardikShah over 13 years ago

TI__Mastermind 20245 points

Hi,

EDID block gives timings supported by monitor and also the optimum timing for that montior. You can read that and directly program that to mode entry of the HDMI display. You can directly refer to below link on how timing entry are specified in EDID. This is applications job and application needs to handle this.

http://en.wikipedia.org/wiki/Extended_display_identification_data

0 Sujith over 12 years ago in reply to HardikShah

TI__Genius 12455 points

Sweta,

You could use the IOCTL TI81XXHDMI_READ_EDID to retrive the EDID of the connected TV / Monitor.

OR cat /sys/devices/platform/vpss/display0/edid

Thanks,

Sujith

0 sweta bhatt over 12 years ago in reply to Sujith

Expert 2345 points

Thanks Hardik & Sujith,

Does anybody know how to program output timing generator ?

Is there any documentation/sample application to do so ?

Regards,
Sweta

0 HardikShah over 12 years ago in reply to sweta bhatt

TI__Mastermind 20245 points

Hi,

You can program timing generator of VENC using "cat /sys/devices/platfom/vpss/displayx/timings entry. It internally programs the timing generator based on parameters.

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Reading EDID of display and programming o/p timing generation