C6748 EDMA instances supported

David Luca

Hello,

I was just reading the EDMA LLD documentation regarding the initialization of the driver and on page 16-20 of http://processors.wiki.ti.com/images/5/5e/EDMA3_LLD.pdf it says that "since all processors today only have one EDMA, use instanceId = 0", but in my knowledge C6748 supports 2 TC on CC0 and 1 TC on CC1, are they going to be used or every peripheral on PSP drivers will be on TC0?

I'm trying to reserve CC1 for an EMIFA connected 16-bit ADC driver and keep the other 2 TC for SPI, I2C and UART peripherals. How do I make sure the correct TC is being used? Or do I need to create my own driver?

Thank you in advance,

David.

over 12 years ago

0 Radhesh Bhat over 12 years ago

Genius 4590 points

Hi David,

InstanceId does not indicate about TCs present in EDMA, it actually identifies actual number of EDMA HW.

In your case you may want to program DMAQNUM.

0 David Luca over 12 years ago in reply to Radhesh Bhat

Expert 2795 points

Hi Radhesh,

I haven't seen any mention of DMAQNUM in the EDMA3 LLD documentation, is the spelling correct?

Best regards,

David.

0 Radhesh Bhat over 12 years ago in reply to David Luca

Genius 4590 points

Hi David,

Sorry abt the confusion, i was referring in the TRM http://www.ti.com/litv/pdf/spruh79a under EDMA chapter section

0 David Luca over 12 years ago in reply to Radhesh Bhat

Expert 2795 points

Hi Radhesh,

I'm sorry, but still don't understand what "TMR" means. I was referring to EDMA3 LLD driver (http://processors.wiki.ti.com/index.php/Programming_the_EDMA3_using_the_Low-Level_Driver_(LLD)) I intend to use this driver instead of writing my own driver or accessing registers directly.

Best regards,

David.

0 Radhesh Bhat over 12 years ago in reply to David Luca

Genius 4590 points

Hi David,

If you have got the LLD package with you, just search for EDMA3_DRV_mapChToEvtQ in the drv package.

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C6748 EDMA instances supported