AM4378: DSS data swapping

Sh.Sasaki

Part Number: AM4378

Hi experts,

I want to know if the output of the DSS_DATAX can swap.

My customer designed an LCD-circuit of AM4378, but the HW design was incorrect.
That's why they want to fix it by swapping the DSS_DATAX in software.
Can the A4378 swap the output of the DSS_DATAX ?

They are using the latest Processor SDK RTOS.

Best regards,
Sasaki

over 5 years ago

0 Frank Livingston over 5 years ago

TI__Mastermind 29198 points

Hi,

I need to take a bit of time to research this issue. I'll get back with you shortly.

Regards,
Frank

0 Sh.Sasaki over 5 years ago in reply to Frank Livingston

Guru 13625 points

Hi Frank-san,

Thank you.

I'm looking forward to hearing from you.

Best regards,
Sasaki

0 Sh.Sasaki over 5 years ago in reply to Frank Livingston

Guru 13625 points

Hi Frank-san,

Do you have any update?

Best regards,
Sasaki

0 Frank Livingston over 5 years ago in reply to Sh.Sasaki

TI__Mastermind 29198 points

Hi,

No, I should have an update shortly. Thanks for your patience.

Regards,
Frank

0 Frank Livingston over 5 years ago in reply to Frank Livingston

TI__Mastermind 29198 points

Hi,

I consulted internally on this, and the consensus is it should be possible to swap the data lines.

For AM437x, the DSS is supported in Starterware. For changing the organization of the data lines, I suggest changing the pin mux configuration. Please see the Starterware pin mux file in <PDK>/packages/ti/starterware/board/am43xx/am43xx_pinmux.h.

Regards,
Frank

0 Sh.Sasaki over 5 years ago in reply to Frank Livingston

Guru 13625 points

Hi Frank-san,

Thank you for your reply.

I checked <PDK>/packages/ti/starterware/board/am43xx/am43xx_pinmux.h.

I tried to modify this file using the Pinmux tool, but the DSS Pinmux could not change it.

For example, if I try to change Pinmux in DSS_DATA5, there is no configurable configuration that can be changed.

https://dev.ti.com/sysconfig/?fromPinmux=true#/start

Could you tell me how to change the pin mux configuration?

Best regards,
Sasaki

0 Sh.Sasaki over 5 years ago in reply to Frank Livingston

Guru 13625 points

Hi Frank-san,

Do you have any additional information?

Best regards,
Sasaki

0 Frank Livingston over 5 years ago in reply to Sh.Sasaki

TI__Mastermind 29198 points

Hi Sasaki,

I confirmed your findings by:

checking the datasheet for DSS pad configuration options
attempting to change the PAD mux using the pinmux utility(like you've done above).

So it appears the consensus I mentioned above was incorrect.

I don't have any other ready solutions for the customer hardware mix up. Perhaps the driver could be modified to handle this situation. However, it would be up to the customer to make the modifications since in general TI doesn't support driver modifications.

Regards,
Frank

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AM4378: DSS data swapping