TIVA EPI-uDMA

Krishnan G Nair

Expert 1235 points

Hello,

We are using EPI-uDMA to read data from FPGA to tiva memory.

1)With out Dma we are able to read the data to system memory through EPI from FPGA.

2)Now we are trying to read EPI -UDMA configuration.

Question: I am using two interrupt handlers configured

a)EPI Interrrupt

b)udmaerror and in start up_ccs.c ,i registered this interrupt,but compared to other cases like usually i click on a interrupt handler in main code it will jump to startup_ccs.c(extern sysctrlint(void)) vector table. Same configurations i made here but its not happening ,weather i am missing any thing in configuration............(utilities,cmd file,target config all added,headers are also added)

c) in start upccs is it correct to configure EPIIntHandler, // External Bus Interface 0 in vector table.

Please help me to resolve this issues.......

Regards,

Krishnan

over 8 years ago

0 Amit Ashara over 8 years ago

TI__Guru**** 244380 points

Hello Krishnan

Is the interrupt source getting asserted? If there is no UDMA error then its interrupt handler shall not be called. Similarly if the EPI Interrupt is not getting asserted then neither will its interrupt service routine be called. Do make sure that the correct bits in EPIIM bits are set for the EPI Interrupt to be asserted

Regards
Amit

0 Krishnan G Nair over 8 years ago in reply to Amit Ashara

Expert 1235 points

Hello,

Amit in my case the interrupt is not getting asserted in vector table,For example in "enetio example" if we click Systic int handler, it will jump to start up ccs file...but in my case its not happening,previously i done it for GPIO interrupt and was properly working for me.....

Its not the case that no udma error or epi error because i am in initial stage of udma reading epi...

I think now you can understand my query.....................

Please replay,

Regards,

Krishnan

0 Amit Ashara over 8 years ago in reply to Krishnan G Nair

TI__Guru**** 244380 points

Hello Krishnan,

Have you enabled the Interrupt in NVIC by calling IntEnable function with the correct Interrupt Vector Number/Name?

Are the bits in the Interrupt Mask Register for the peripheral set and is the corresponding EPIMIS register bit getting set?

Regards
Amit

0 Krishnan G Nair over 8 years ago in reply to Amit Ashara

Expert 1235 points

Hello Amit,

I have enabled the Interrupt in NVIC Function by Interrupt Vector name.

For EPI i am using EPIIntHandler,/ // External Bus Interface 0 is it correct for EPI Interrupt.............

Please replay,

Regards,

Krishnan

0 Amit Ashara over 8 years ago in reply to Krishnan G Nair

TI__Guru**** 244380 points

Hello Krishnan

I would suggest you sending the full code of EPI+DNA for review

Regards
Amit

0 Krishnan G Nair over 8 years ago in reply to Amit Ashara

Expert 1235 points

Hello,

Thank you for the message ,i am attaching my project .

Regards,

KrishnanCIT_UDMA_EPI.zip

0 Amit Ashara over 8 years ago in reply to Krishnan G Nair

TI__Guru**** 244380 points

Hello Krishnan,

My observations

1. Nowhere in the code are you setting the Interrupt Mask bits in the EPI's IM register. How will EPI generate an interrupt without required EPIIM bits being set.
2. The uDMA Channel Assignment configuration needs to be updated to follow the new style of using uDMA channel. I would suggest referring to the udma_demo example code. The primary structure needs to be initialized.

Regards
Amit

0 Krishnan G Nair over 8 years ago in reply to Amit Ashara

Expert 1235 points

Ok,

Thank you i am understanding the concept.

Thank you for the suggestion

Regards,

Krishnan

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