Starterware/AM3517: SDMA receive interrupt not called

ranchu

Guru 20755 points

Part Number: AM3517

Tool/software: Starterware

Hello,

I use am35x sitara, for SDMA transfer.

The sdma is initialized for sdma memory to memory copy .

For some reason the interrupt callback handler is not called after sending the buffer.

I send the buffer on channel #0, so I expects irq #12 to be called. Therefore, interrupt handler is registered on irq #12.

Is there any idea what might be the reason for that ? Is it an issue of clock, power domain?

Thank you,

Ran

over 8 years ago

0 Biser Gatchev-XID over 8 years ago

TI__Guru**** 393215 points

Hi,

What software are you using? Which version?

0 ranchu over 8 years ago in reply to Biser Gatchev-XID

Guru 20755 points

Hi,

I am using bare-metal with simple services, like uc/os.
I have verified that interrupt handler are received on various modules (timers for example).

Also, the same dma test for was verified on same processor, but with different OS .
Regards,
Ran

0 ranchu over 8 years ago in reply to ranchu

Guru 20755 points

Hi,

I would also add that this is the sequence of read/writes I am doing:

wr: 0x48056078 0x10080
rd: 0x48056090 0xe1e56
wr: 0x48056090 0xe1e56
wr: 0x4805609c 0x8000c440
wr: 0x480560a4 0x0
wr: 0x480560a8 0x0
wr: 0x480560a0 0x8000c4a8
wr: 0x480560ac 0x0
wr: 0x480560b0 0x0
wr: 0x48056098 0x0
wr: 0x48056094 0x100
rd: 0x48056080 0x3065000
wr: 0x48056080 0x3065000
wr: 0x4805608c 0xffe
wr: 0x48056088 0x20
rd: 0x48056018 0x0
wr: 0x48056018 0x1
rd: 0x48056080 0x3065000
wr: 0x48056080 0x3065080

<<---- waiting for interrupt

Thank you for any suggestion,
Ran

0 Biser Gatchev-XID over 8 years ago in reply to ranchu

TI__Guru**** 393215 points

Have you referred to section 7.5 of the AM35x TRM Rev. C?

0 ranchu over 8 years ago in reply to Biser Gatchev-XID

Guru 20755 points

Hi Biser,

Thank you.
I did make a progress and now I see that interrupt handler is called if transmit size is larger than 1024 bytes.
The test configures fifo depth to 128, so I figured out it might be related to this value, yet trying to lower this value I still get that only a larger size of 1024 results in callback handler being called.
I will continue investigating it.

Regards,
Ran

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Starterware/AM3517: SDMA receive interrupt not called