SPORT examples in Multi-channel mode

Hi Ranji, 

I modified the example for BF706, SPORT1 Channel A. 

Works like a charm, Thank You.

One more question here:

In the SPORT2_Transmitter_Multichannel_Core0 example after the DMA has transmitted the BUFF_SIZE words of data, it stops. I wish to immediately tell the DMA to Tx another buffer of same size(BUFF_SIZE ) and then stop, sort of a PING-PONG way. How do I do that here in this example?

Hi Raam,

We would suggest you to refer the "Descriptor-Based Flow Modes"(Page No: 778/2223) and "DMA Channel Triggers"(Page No: 786/2223) sections in the ADSP-BF707 HRM manual.
www.analog.com/.../BF70x_BlackfinProcessorHardwareReference.pdf

Also, please refer the attached code for ADSP-SC58x which is configured in DMA Descriptor list mode. You can refer the DMA configurations in the example and modify accordingly for ADSP-BF706.

Regards,
Ranjitha R

I2S_DMA_Descriptor_list.zip

Ranji, Thank you, I modified the sample code for BF706 and the code works great.

Great example !!

While I was experimenting with this sample code, I also came across another sample code for BF533, which achieved the PING-PONG transmit using the following logic.

It declared a 2D array of size [2][BUF_SIZE] and initialized it with the intial data to transmit. Programmed the DMA in Auto-Buffer mode and for 2D-transfers. It also programmed the SPORT for raising an iterrupt after the XCOUNT(BUF_SIZE in this case) bytes got transferred. And, In the ISR, just figure out which element (0 or 1) of the 2D-array just got transmitted, and load this element with fresh data, while the DMA transferred the other element, and so on.

What is your view on this logic? Is it also a correct implementation of DMA in ping-pong mode ?