OMAP L138 LCDC DMA

Shmuel Schon

Hello,

I wish to use the DMA engine of the LCDC.
I plan to work with the LIDD controller in Async MPU80 mode.
My bus is 8 bit wide and not 16.

Does that mean I should configure the BURST_SIZE of the DMA (through LCDDMA_CTRL) to be 8?
Will the DMA in that case take only 8 bits from the frame buffer on each write access?

Or should the frame buffer be arranged in a particular manner to implement that?

Thanks.

Best regards,

Shmulik

over 13 years ago

0 Paul.Yin over 13 years ago

TI__Genius 14405 points

Hello Shmulik,

I thought MPU80 is a 16-bit interface.

BURST_SIZE has nothing to do with final output bit wide. It only controls how much data it grabs from memory.

regards,

Paul

0 Shmuel Schon over 13 years ago in reply to Paul.Yin

Prodigy 20 points

Thanks Paul.

I have another question just for clarification:
Does BURST_SIZE is in terms of 32 bit words or is it in bits?
For example, does BURST_SIZE of 8 means a transfer of 8 words of 32 bits or is it a transfer of 8 bits?

Thanks,
Shmulik

0 Paul.Yin over 13 years ago in reply to Shmuel Schon

TI__Genius 14405 points

Shmulik,

It is in number of 32 bit words. so burst size of 1 = 32 bits.

regards,

Paul

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OMAP L138 LCDC DMA