DMA interrupts

Jack Andrews

Intellectual 370 points

Other Parts Discussed in Thread: HALCOGEN

Hi, I'm trying to get DMA interrupts to work. Here's my code:

main()
{
_enable_interrupt_();

....

dmaEnableInterrupt(SPI1_DMA,FTC);

}

void dmaNotification(dmaBASE_t *DMA, uint32 flags)
{
while(1);
}

I've also enabled VIM channel 33 (DMA FTC) in HalCoGen. Unfortunately, my ISR is never reached. The DMA is definitely working, so it would seem to be my interrupt configuration which is wrong. Any ideas?

Thanks,

Jack

over 12 years ago

0 KARTHIKEYAN RAJAMANICKAM over 12 years ago

TI__Genius 11645 points

Hello jack,

Can you give us a little more detail's about which device/platform you are trying this on.

If its a simple project, then try to send across the same for us to have a look at, as there are not much info here.

Best Regards,

Karthik.

0 Jack Andrews over 12 years ago in reply to KARTHIKEYAN RAJAMANICKAM

Intellectual 370 points

Apologies, here is the project: 3817.test.zip

0 Jack Andrews over 12 years ago in reply to Jack Andrews

Intellectual 370 points

I noticed that ' _enable_interrupt_()' (which I copied from 'example_i2cInterrupt_Communication.c' in the HalCoGen example folder) should actually be '_enable_interrupts()', but it still isn't working. Any ideas?

0 KARTHIKEYAN RAJAMANICKAM over 12 years ago in reply to Jack Andrews

TI__Genius 11645 points

Jack,

I'm looking in to your code, will get back to you as soon as possible.

0 Jack Andrews over 12 years ago in reply to KARTHIKEYAN RAJAMANICKAM

Intellectual 370 points

Thanks. I notice that 'static const t_isrFuncPTR s_vim_init[129]' in sys_vim.c only points to phantomInterrupt. Is this correct? Either way, code never reaches phantomInterrupt either.

Jack

0 KARTHIKEYAN RAJAMANICKAM over 12 years ago in reply to KARTHIKEYAN RAJAMANICKAM

TI__Genius 11645 points

Hello Jack,

There were a few missing items.

1. You should populate the VIM RAM with ISR address corresponding to the required interrupt request (viz DMA FTC).

2. Another important thing I noticed was with the DMA interrupt enable, apart from enabling the FTC/BTC/HBC for a particular channel, there is a global interrupt enable for every channel which should be configured as well(GCHIENAS).

Since you were more concerned with the interrupts, I have made a simple DMA Software triggered Block transfer with BTC interrupt enabed.

There are two files attached,

sys_main.c (software triggered DMA Block transfer) 4657.sys_main.c

sys_dma.c (minor change in the dmaEnableInterrupt routine to set the Global channel interrupt in addition). 2211.sys_dma.c

Hope that helps.

Best Regards,

Karthik.

0 Jack Andrews over 12 years ago in reply to KARTHIKEYAN RAJAMANICKAM

Intellectual 370 points

Thanks very much Karthik, it's working now. A small suggestion, but would it not make sense to include 'dmaREG->GCHIENAS |= 1U << channel;' in the HalCoGen generated code?

Cheers,

Jack

0 KARTHIKEYAN RAJAMANICKAM over 12 years ago in reply to Jack Andrews

TI__Genius 11645 points

Jack,

Yes, I will have a word with the Halcogen folks about it.

Best Regards,

Karthik.

0 Prathap over 12 years ago in reply to KARTHIKEYAN RAJAMANICKAM

TI__Genius 14205 points

This fix has be already done in the latest HALCoGen release 03.05.01. in HALCoGen Autoupdate would have poped to install 03.05.01, please install to get the latest version.

Regards
Prathap

0 Jack Andrews over 12 years ago in reply to Prathap

Intellectual 370 points

Thanks. Also, for anyone else struggling, don't forget to include #pragma INTERRUPT(isrFucntion, IRQ) for all your ISRs! Also, this document is useful for explaining how it all works:

http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0363g/BEIDDFBB.html

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DMA interrupts