TDA2EG-17: TDA2EG-17 How to Force IPu HDMI Output

user5335884

Intellectual 600 points

Part Number: TDA2EG-17

HI master:

sdk: processor_sdk_vision_03_05_00_00

my board boot as linux target, How to Force IPu HDMI Output ?

over 6 years ago

0 Rishabh Garg over 6 years ago

TI__Guru 55685 points

Hi,

You can choose different display interfaces from system settings i.e. option "s" on the main menu in UART.

Regards,

Rishabh

0 user5335884 over 6 years ago in reply to Rishabh Garg

Intellectual 600 points

HI，master

Now if you connect to the HDMI receiver, the hmdi signal will output. If you do not connect to the HDMI receiver, the HDMI signal will not output. Now I need to output the HDMI signal when I do not connect to the HDMI receiver.

0 Rishabh Garg over 6 years ago in reply to user5335884

TI__Guru 55685 points

Hi,

DSS will always output the data irrespective of receiver.

In case receiver is not connected the data is thrown away.

In case you do not have any further question I will close the thread.

Regards,

Rishabh

0 user5335884 over 6 years ago in reply to Rishabh Garg

Intellectual 600 points

HI，

Thank you for your reply

Why do we use oscilloscope energy to reach HDMI clock when there is a HDMI receiver, but when there is no HDMI receiver, we can't use oscilloscope to measure HDMI clock.

0 Rishabh Garg over 6 years ago in reply to user5335884

TI__Guru 55685 points

Hi,

In Linux, typical sequence is to first detect HPD, read EDID and then start transmission.

Without first two you cannot start sending HDMI data.

RTOS driver starts the transmission without HPD and EDID.

Hence in this case you might need to use RTOS driver.

However can you explain the use case for a better response.

Regards,

Rishabh

0 user5335884 over 6 years ago in reply to Rishabh Garg

Intellectual 600 points

ti-processor-sdk-linux-automotive-dra7xx-evm-03_04_00_03 linux, I can force the output of hdmi, but processor_sdk_vision_03_05_00 M4 IPU control DSS I don't know how to force the output of HDMI processor_sdk_vision_03_05_00 ,

in M4 IPU control DSS RTOS driver use oscilloscope energy to reach HDMI clock when there is a HDMI receiver, but when there is no HDMI receiver, we can't use oscilloscope to measure HDMI clock.

0 Rishabh Garg over 6 years ago in reply to user5335884

TI__Guru 55685 points

Hi,

Which pins are you probing to see the clock?

How did you force the output in ti-processor-sdk-linux-automotive-dra7xx-evm-03_04_00_03 linux as mentioned above?

Regards,

Rishabh

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TDA2EG-17: TDA2EG-17 How to Force IPu HDMI Output