uDMA peripheral-to-peripheral Transfer

Curtis Mayberry1

Other Parts Discussed in Thread: TM4C1294NCPDT

Hello,

I realize that the datasheet does not list the ability to make peripheral-to-peripheral transfers, but it's not clear to me why that is. Why can I not have it transfer from, for example the RX FIFO of the SSI to the TX FIFO of the UART. why doesn't the following initialization code work?

	uDMAChannelTransferSet(twe_QSSI_COMM_RX_UDMA_CHANNEL | UDMA_PRI_SELECT,
						   UDMA_MODE_BASIC,
						   (void *)(twe_QSSI_COMM_BASE + SSI_O_DR), (void *)(TWE_UART_COMM_BASE + UART_O_DR),
						   4);

I am using the tm4c1294ncpdt.

Regards,

Curtis

over 11 years ago

0 Amit Ashara over 11 years ago

TI__Guru**** 244400 points

Hello Curtis,

As far as I know Peripheral to Peripheral Transfer should be possible and the configuration sequence is correct. Do make sure that

1. The Two peripherals are enabled and initialized

2. The destination peripheral is not enabled for uDMA operation.

3. The FIFO (if available) is enabled and if not available then the ARB Size needs to be one/

Regards

Amit

0 Curtis Mayberry1 over 11 years ago in reply to Amit Ashara

Intellectual 845 points

Hey Amit,

Thanks for the reply!

That's good news!

I think the real reason that the setup using the uDMA didn't work was because the receiving QSSI was in slave mode so it wasn't receiving the data that needed to be transferred using the uDMA. If we can solve the problem in the following post I think we would solve the root problem:

http://e2e.ti.com/support/microcontrollers/tiva_arm/f/908/t/341195.aspx

Regards,

Curtis

0 Amit Ashara over 11 years ago in reply to Curtis Mayberry1

TI__Guru**** 244400 points

Hello Curtis,

OK. Let me work on the other thread to get this working as well.

Regards

Amot

0 Curtis Mayberry1 over 11 years ago in reply to Amit Ashara

Intellectual 845 points

Hey Amit,

Have you had any success getting the QSSI to receive data in slave mode?

If you can, please reply on the following post so it is more relevant to the post topic:

http://e2e.ti.com/support/microcontrollers/tiva_arm/f/908/t/341195.aspx

Regards,

Curtis

0 Amit Ashara over 11 years ago in reply to Curtis Mayberry1

TI__Guru**** 244400 points

Hello Curtis

Been busy with some example development on TIVA/ Will look into the thread next week.

Regards

Amit

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uDMA peripheral-to-peripheral Transfer