How to use the VGA port on the DM8148 EVM

Steven Harris

Other Parts Discussed in Thread: TVP7002, TVP5147

Hi,

What changes do I need to make to get the TVP7002 to use the VGA input rather than the Component input?

There are entries in ti81xx_vpss.c for:

static const struct ti81xxvin_input hdvpss_inst0_inputs[] = {
{
.input = {
.index = 0,
.name = "Component",
.type = V4L2_INPUT_TYPE_CAMERA,
.std = V4L2_STD_UNKNOWN,
.capabilities = V4L2_OUT_CAP_PRESETS,
},
.subdev_name = TVP7002_INST0,
.dv_presets = hdvpss_inst0_inp0_presets,
.num_dv_presets = ARRAY_SIZE(hdvpss_inst0_inp0_presets),
},
};

static const struct ti81xxvin_input hdvpss_inst1_inputs[] = {
{
.input = {
.index = 0,
.name = "Component",
.type = V4L2_INPUT_TYPE_CAMERA,
.std = V4L2_STD_UNKNOWN,
.capabilities = V4L2_OUT_CAP_PRESETS,
},
.subdev_name = TVP7002_INST1,
.dv_presets = hdvpss_inst2_inp0_presets,
.num_dv_presets = ARRAY_SIZE(hdvpss_inst2_inp0_presets),
},
};

How do I change these to use the VGA input?

Please do not just send me a link to the "Adding external decoders" document at http://processors.wiki.ti.com/index.php/DM81xx_AM38xx_Adding_External_Decoders_to_V4L2_Capture_Driver, which I have already read!

Thanks,

Steven

over 12 years ago

0 Margarita Gashova over 12 years ago

TI__Guru* 80190 points

Hello,

You could check here :

http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/716/p/222825/785601.aspx

Best Regards,

Margarita

0 Steven Harris over 12 years ago in reply to Margarita Gashova

Expert 1160 points

Hi,

Does this mean that the VGA input will not work even with software changes?

So if I understand correctly the following is not supported on the DM8148 EVM:

* The VGA input to the TVP7002 is not supported and will not work.

* The TVP5147 SD capture chip is not supported at all so will not work along with the composite input or S-Video inputs.

* The HDMI input is not supported because there is some kind of hardware problem with the Rev D DM8148 EVM and so this will not work.

So all things considered this is a pretty expensive and useless development board?

0 HardikShah over 12 years ago in reply to Steven Harris

TI__Mastermind 20245 points

Hi,

For VGA input you need to make changes to TVP7002 driver as well. Currently TVP7002 driver doesnt support VGA input. After doing that you need to look at schematics on how the VGA output lines are routed to VIP. You may have to set a mux or two uisng I2C calls for making VGA working.

0 Steven Harris over 12 years ago in reply to HardikShah

Expert 1160 points

Hi,

Given that VGA is on the EVM board why has this not already been done by TI?

Steven

0 Viet Dinh over 12 years ago in reply to Steven Harris

TI__Genius 15310 points

Hi Steven,

Please refer to the spreadsheet in the zip file for TVP7002 RGB setup.

http://www.ti.com/litv/zip/slec029

Regards,

Viet

0 HardikShah over 12 years ago in reply to Viet Dinh

TI__Mastermind 20245 points

Hi,

Open source TVP7002 driver is used to connect TVP7002 to VIP and it supports only YUV. There was no need to support RGB at time when driver was being developed.

0 Steven Harris over 12 years ago in reply to Viet Dinh

Expert 1160 points

Hi Viet,

Thanks for the link.

What do I do with the files? Do I need to put them in a certain location? Do I use them with a JTAG? I'm not even sure they apply to the DM8148 EVM?

Thanks,

Steven

0 Viet Dinh over 12 years ago in reply to Steven Harris

TI__Genius 15310 points

Hi Steven,

The file has all the registers for you to configures the TVP7002 VGA output for your driver.

BR,

Viet

0 YONG ZOU over 12 years ago in reply to Viet Dinh

Intellectual 380 points

Hi Viet,

The link is no longer valid. Can you give valid link or a way so that I can get those files?

Regards,

Yong Zou

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How to use the VGA port on the DM8148 EVM