EDMA: TCINTEN interrupt not working but ITCINTEN works

Vishwa Shanika

Hi dear all,

I 'm using ti-sdk-am335x-evm-07.00.00.00 with BeagleBone Black . I need to make use of EDMA for data transfer with beaglebone. I modified the header of the "edma_test.c" and make it usable with ti-sdk-am335x-evm-07.00.00.00. "edma_test.c" is having three senarios of DMA transfers. I need only "Mem-2-Mem Copy" mode.

I need to get the DMA transfer complete interrupt after the all transfers are complete. So I only enabled "TCINTEN" and ran the example. I could see transfer completion callback is not calling by only enabling TCINTEN. Then I enabled only ITCINTEN interrupts. Then I could see callback is called for all DMA transfers (which is expected). If I enabled both TCINTEN and ITCINTEN, I could see same number of callings for callbacks. So it seems something going behind with the "TCINTEN".

ITCINTEN only register settings (64 call backs)

[   62.388399] dma_ch 0:dma param: opt = 0x80200000
[   62.394882] dma_ch 0:dma param: src = 0x9D800000
[   62.399824] dma_ch 0:dma param: dst = 0x9D808000
[   62.404755] dma_ch 0:dma param: acnt = 512
[   62.409054] dma_ch 0:dma param: bcnt = 8
[   62.413165] dma_ch 0:dma param: ccnt = 8
[   62.417284] dma_ch 0:dma param: brld = 8
[   62.421394] dma_ch 0:dma param: link (SMD)= 0xffff

TCINTEN only register settings (0 call backs)

[   49.028050] dma_ch 0:dma param: opt = 0x80100000
[   49.034536] dma_ch 0:dma param: src = 0x9D800000
[   49.039488] dma_ch 0:dma param: dst = 0x9D808000
[   49.044419] dma_ch 0:dma param: acnt = 512
[   49.048721] dma_ch 0:dma param: bcnt = 8
[   49.052834] dma_ch 0:dma param: ccnt = 8
[   49.056943] dma_ch 0:dma param: brld = 8
[   49.061066] dma_ch 0:dma param: link (SMD)= 0xffff

TCINTEN and ITCINTEN register settings (64 call backs)

[   46.320885] dma_ch 0:dma param: opt = 0x80300000
[   46.327375] dma_ch 0:dma param: src = 0x9D800000
[   46.332308] dma_ch 0:dma param: dst = 0x9D808000
[   46.337238] dma_ch 0:dma param: acnt = 512
[   46.341538] dma_ch 0:dma param: bcnt = 8
[   46.345647] dma_ch 0:dma param: ccnt = 8
[   46.349766] dma_ch 0:dma param: brld = 8
[   46.353875] dma_ch 0:dma param: link (SMD)= 0xffff

I did not followed the instruction for DMA channel reservation steps, mentioned in processors.wiki.ti.com/.../AM335x_EDMA_Driver%27s_Guide . And I tried with purely built ti-sdk-am335x-evm-07.00.00.00 sd-card images.

Thank you.

Regards,

Vishwa Shanika

over 10 years ago

0 Biser Gatchev-XID over 10 years ago

TI__Guru**** 393215 points

Hi,

I will forward this to the SW team.

0 Georgi Karpov over 10 years ago

Expert 1185 points

Hi Vishwa Shanika,

can you please share the version of edma_test.c you are using.

Thanks,
Georgi

0 Vishwa Shanika over 10 years ago in reply to Georgi Karpov

Prodigy 60 points

Hi Georgi,

I don't have idea of the version of edma_test.c. But I found it from a here.
processors.wiki.ti.com/.../EDMA_sample_test_application

I modified only the header files to make it compilable in "ti-sdk-am335x-evm-07.00.00.00".

Thanks,
Vishwa

0 Georgi Karpov over 10 years ago in reply to Vishwa Shanika

Expert 1185 points

Hi Vishwa,

for me this module works . Аll the edma3_memtomemcpytest_dma transfers pass only if both TCINTEN and ITCINTEN are enabled. It stops when one of the options TCINTEN or ITCINTEN is disabled.
Here in 11.3.9.1 is mentioned that enabling Transfer Completion Interrupts must be done by enabling both options TCINTEN and ITCINTEN.

http://phytec.com/wiki/images/7/72/AM335x_techincal_reference_manual.pdf

Best regards,
Georgi

0 Vishwa Shanika over 10 years ago in reply to Georgi Karpov

Prodigy 60 points

Hi Georgi,

Thanks for your reply. I also observed the same result as you have mentioned.
>> Аll the edma3_memtomemcpytest_dma transfers pass only if both TCINTEN and ITCINTEN are enabled.

But I could get the callback called by only ITCINTEN. But could not from only TCINTEN.
>>It stops when one of the options TCINTEN or ITCINTEN is disabled.

And I need to make it works for with only TCINTEN. According to the Table 11.16 : Number of Interrupts, Reference Manual, it should work from one of the options (TCINTEN or ITCINTEN) as well.

Thanks
Vishwa

0 Georgi Karpov over 10 years ago in reply to Vishwa Shanika

Expert 1185 points

Hi Vishwa,

in case with only TCINTEN enabled, you can try to comment
while (irqraised1 == 0u);
and then test will not stop.
but I will check if it is harmless for the test later.

BR,
Georgi

0 Georgi Karpov over 10 years ago in reply to Georgi Karpov

Expert 1185 points

Hi Vishwa,

please, look in this document:

there in Appendix B, (5.b) is written how to act, when one of the interrupts is disabled, and transfer is waiting for completion.

BR,
Georgi

0 Wolfgang Muees1 over 10 years ago

Genius 3685 points

As a work around, you may use DMA chaining.

And in the second DMA channel, you may program the parameters so that ITCINTEN will come at the same time as TCINTEN for the first channel.

I have used DMAin the memory to peripheral mode, and have no problem with TCINTEN.

regards

Wolfgang

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EDMA: TCINTEN interrupt not working but ITCINTEN works