DS90UB948-Q1: Internal Pattern

user5319856

Part Number: DS90UB948-Q1

Hello,

I am trying to output a pattern on a display using the internal generation function. I configured everything as in SNLA123d application note but I can only see the backlight. Could you help me ? I just want to output something. Why if a follow the 4.3 chapter sequence still no output can be seen ?

over 4 years ago

0 Casey McCrea over 4 years ago

TI__Guru* 98385 points

Hello,

Can you please send your panel timing specifications and the programming steps you have used? Also what hardware are you using? The 948 EVM or a custom board?

Best Regards,

Casey

0 user5319856 over 4 years ago in reply to Casey McCrea

Prodigy 120 points

It's a custom board. I'm following the 4.3 section from http://www.ti.com/lit/an/snla132d/snla132d.pdf application note.

0 user5319856 over 4 years ago in reply to Casey McCrea

Prodigy 120 points

Can you give to me a command sequence in order to output a pattern ? I analysed the output lines and I can only see the CLK1 and CLK2 active, data lines are always high.

0 Casey McCrea over 4 years ago in reply to user5319856

TI__Guru* 98385 points

Hello,

You can try following the exact code provided in section 4.3 of the app note. If you use an all white pattern 0x64 = 0x11, then the only data lanes you will see toggling are the D2 and D6 lanes which contain the sync signals. The other lanes will contain all white data (zeros).

For more dynamic data, you could try using color bars. 0x64 = 0x05

Best Regards,

Casey

0 user5319856 over 4 years ago in reply to Casey McCrea

Prodigy 120 points

I can only see the clock pins toggling, all other pins (including D2 and D6 are inactive).

0 Casey McCrea over 4 years ago in reply to user5319856

TI__Guru* 98385 points

Hello,

Are you testing with the TI EVM or a custom board? I would suggest if you are still having problems to try using a 948 Eval board for reference.

Best Regards,
Casey

0 Casey McCrea over 4 years ago in reply to Casey McCrea

TI__Guru* 98385 points

Hello,

Were you able to test with the TI EVM?

Best Regards,

Casey

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DS90UB948-Q1: Internal Pattern