DM3730 CVBS out only has the luminance component

hang zhang79809

Other Parts Discussed in Thread: DM3730

Hi Everybody

I am running the saMmapLoopback application and displaying the video through the DM3730 cvideo1_out output ports.I can seem the video, however, the video only has the luminance component.
I have tried command /saMmapLoopback -u 0 -i 0/ and /saMmapLoopback -u 0 -i 1/, but the results seem to be the same.
Has anyone help me output color composite video ?

Thanks

over 13 years ago

0 HardikShah over 13 years ago

TI__Mastermind 20245 points

Hi,

Please try it on S-video output. By default i think its double channel.

Regards,

Hardik Shah

0 hang zhang79809 over 13 years ago in reply to HardikShah

Prodigy 70 points

thanks Shah

I have tried on S-video output, on the S-video output there is color. But i want to get single channel composite color video. What should I do？

0 HardikShah over 13 years ago in reply to hang zhang79809

TI__Mastermind 20245 points

Hi,

This requires a change in application and board too. Let me get back to you with required information. I am not sure about about change required. Hardware and software both supports CVBS output.

Regards,

Hardik Shah

0 hang zhang79809 over 13 years ago in reply to HardikShah

Prodigy 70 points

I am looking forward to your information.

Thank you

0 HardikShah over 13 years ago in reply to hang zhang79809

TI__Mastermind 20245 points

Hi,

Following are the steps to test composite on SD output.

1. echo 0 > /sys/devices/platform/vpss/display2/enabled

2. echo composite > /sys/devices/platform/vpss/display2/output

3. echo 1 > /sys/devices/platform/vpss/display2/enabled

4. Change jumper JP3 between Svideo and Composite output towards Composite.

Jumper is provided only on certain versions of board. I am not sure whether you have that jumper or not. If its not there than its not possible to use composite output on your board.

Regards,

Hardik shah

0 hang zhang79809 over 13 years ago in reply to HardikShah

Prodigy 70 points

Thank you,

According to your way, we have got colour composite video.

Regards,

Hang

0 HardikShah over 13 years ago in reply to hang zhang79809

TI__Mastermind 20245 points

Hi,

Can you please mark thread as answered.

Regards,

Hardik Shah

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DM3730 CVBS out only has the luminance component