TMS570LS3137: DMA channel chaining is not working in developement board

Hi, could anyone help on this query.

Hi Premsai,

Here is the example code for DMA channel chaining:

DMA_Channel_Chaining_Test_LS3137.zip

In this example i took two buffers (one for TX and other for RX) of size of 1024 halfwords.

And i took two DMA channels CH0 and CH1, and i am transferring 512 halfwords using CH0 and another 512 halfwords using CH1.

And here i chained CH1 with CH0, that means CH1 can only happen automatically after CH0. And i enabled software trigger for CH0.

And now you can see the positive test case results (I mean i am only triggering CH0 using software and you can see the CH1 also did the transfer):

Now i am commenting chaining instruction and here is the output (You can see just CH0 data got transferred into RX buffer):

So, we can conclude if chaining instruction is there then CH1 also automatically triggering after CH0 transfer.

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Thanks & regards,
Jagadish.

any examples of channel chaining for sci transmission? i tried the above procedure but only able to transmit 8 bytes, the 2nd channel 8 bytes are going to channel pending.

How you are chaining SCI here,

what is your channel-0 and what is your channel-1. Please give me more details about your requirement to help on this.

As i shared the above code i took channel2 and channel3 each channel 8 bytes , channel3 is chained to channel2. i triggered the channel2 by software trigger and expecting the channel3 also to trigger.

Note: the chaining idea is because i am unable to transfer the 16bytes of SCI data in sequence. But the requirement is the data should come in sequence.

so my destination is LIN_TXDAT1 & DAT0

Thanks for these details,

what is the port you are assigning for both the channels in DMA?

Is it possible to share your project?

No jagadish i cant share the project, but i could take your suggestions if any registers should be checked.

g_dmaCTRLPKT0.PORTASGN  = 4;                 /* SRAM to SRAM                    */

this is in which register?

Hi Premsai,

Apologies for the delay, are you still stuck with this issue?

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Thanks & regards,
Jagadish.