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saMmapLoopback.c

Jie Deng
Prodigy 130 points
Other Parts Discussed in Thread: TVP5146M2, TVP5146

I am using:

1. OMAP35x EVM rev G board.

2. PSP.02.01.03.11

3. CodeSourcery arm-2009q1 toolcchain.

I configured with TVP514x support, omap3 camera support in kernel configuration.

After EVM was booted, I checked dmesg and found the TVP514x is initialized as omap3 camera.

When I ran it, I got:

========================================================

root@omap3evm:/opt# ./saMmapLoopback -u 0
<6>tvp514x 3-005c: tvp5146m2 found at 0xb8 (OMAP I2C adapter)
tvp514x 3-005c: tvp5146m2 found at 0xb8 (OMAP I2C adapter)

Capture: Opened Channel
Capture: Current Input: COMPOSITE
VIDIOC_S_INPUT: Invalid argument
Error in opening capture device for channel 0

=========================================================

If I changed to '-u 1' as usb cam, I got:

==========================================================

root@omap3evm:/opt# ./saMmapLoopback -u 1
<6>tvp514x 3-005c: tvp5146m2 found at 0xb8 (OMAP I2C adapter)
tvp514x 3-005c: tvp5146m2 found at 0xb8 (OMAP I2C adapter)

Capture: Opened Channel
Capture: Current Input: COMPOSITE
Capture: Input changed to: COMPOSITE
Capture: Capable of streaming
Capture: Number of requested buffers = 3
Capture: Init done successfully


Display: Opened Channel
Display: Capable of streaming
Display: Number of requested buffers = 3
Display: Init done successfully

Display: Stream on...
Capture: Stream on...

Display: Stream off!!
Capture: Stream off!!

Loopback Successful

=========================================

It can run as 320x240 usbcam.  Can anyone run saMmapLoopback

with TVP514x as NTSC mode of PAL mode?

Jie Deng

  • 0
    TI__Expert 8180 points

    Hi Deng,

    The above error message means, the TVP5146 video decoder is not able to lock the input signal. Have you connected the input to the MDC (Multi-media daughter card)? Also I believe you are using <Rev-D revision of EVM's here.

    Also the application tries to switch over to the input, if it detects S-Video input then it tries to switch over to CVBS and vice versa so you also may want to comment this.

    Thanks,

    Vaibhav

  • 0 in reply to Vaibhav Hiremath
    Prodigy 130 points

    Hi Vaibhav,

    Thank you very much for your help.

    1.  I am using omap35x evm rev. G board.

    2. I am feeding CVBS with NTSC signal.  I do not use S-Video.

    Regards.

    Jie Deng

  • 0 in reply to Jie Deng
    TI__Expert 8180 points

    Deng,

    Is there any specific reason behind using PSP2.x release? Can you migrate to PSP03.x release?

    Natively, PSP2.x release supports <Rev-D revision of EVM's with MDC (Multi-media Daughter card). If I remember correctly I think the support for TVP5146 on RevG version of EVM got added lately in PSP03.x release. So I would suggest you to migrate to PSP03.00.01.06 release which is latest from PSP.

    Thanks,

    Vaibhav

  • 0 in reply to Vaibhav Hiremath
    Prodigy 130 points

    Hi Vaibhav,

    I am using psp-02.01.03.11 which supports both old boards and Rev. G board.  See the mux code in arch/arm/mach-omap2/board-omap3evm-dc-v4l.c.

    I am working in a driver for Aptina's sensor.  I tried to use saMmapLoopback.c to try the driver code.

    I can move to psp-03.00.01.06.  I need to make some change in driver code to associate the change of V4L2 code in psp-03.00.01.06.

    In psp-03.00.01.06/Rev.G board/CVBS(NTSC)/LCD display combination, can you run saMmapLoopback.c?

    I can run it at this combination.  Howeve, the video at LCD is miss alligned?  Can you try it?

    Many thanks in advance.

    Jie Deng 

  • 0 in reply to Jie Deng
    Prodigy 130 points

    Hi Vaibhav,

    I figured out the miss-alligned issue.  The code was hard code with PAL support.

    Jie

  • 0 in reply to Jie Deng
    TI__Expert 8180 points

    Jie,

    I am not quite sure about hardcoding to PAL, the saMmapLoopback application doesn't hardcode the standard. It barely enumerates it what hardware has detected.I just verified with PSP02.x release package and I don't think it is hardcoded to PAL.

    Thanks,

    Vaibhav