McASP interrupt problem with OMAP-L138

Fjs

Intellectual 360 points

Other Parts Discussed in Thread: OMAP-L138

Hello, i am new in the C6000 DSP's.

I have a MCASP interrupt problem with the OMAP-L138.

I need an interrupt driven audio loop.

First of all, i setup up the McASP device and test it successfully, via a loop in the main function.

In the next step i would like to change this to an interrupt driven audio loop. For that, i install in the DSP/BIOS a HWI (HWI_INT4). My settings:

Interrupt selection number = 54

function = _McASPInt

Use dispatcher = true

Interrupt mask = all

Additionally i set the RDATA bit in the RINTCTL register of the McASP.

In the main function i enabled the HWI via HWI_enable function and set a breakpoint to my ISR function McASPInt, but the interrupt never occures.

What could be the reason that i do not get the McASP receive interrupt?

over 15 years ago

0 Fjs over 15 years ago

Intellectual 360 points

I saw that i used the wrong interrupt table. For the DSP device the McASP EVT is 61. So i changed the interrupt selection number to 61. But the result is the same.

0 Mariana over 15 years ago

TI__Mastermind 24340 points

Hi Fjs:

Please see:

http://tiexpressdsp.com/index.php/Setting_up_interrupts_in_DSP_BIOS

Also, have you seen the PSP examples? To install them, please see:

http://tiexpressdsp.com/index.php/Getting_Started_Guide_for_C6748

C:\Program Files\Texas Instruments\pspdrivers_01_30__00_05\packages\ti\pspiom\examples\evmOMAPL138\audio

This example makes use if the DSP/BIOS drivers to process audio from McASP. See the loop at the audioSample_io.c, function Audio_echo_Task

0 Fjs over 15 years ago in reply to Mariana

Intellectual 360 points

Hi Mariana,

thanks for your answer!

Yes, i think i do it exactly as it was written in

http://tiexpressdsp.com/index.php/Setting_up_interrupts_in_DSP_BIOS

but it does not run.

I looked inside the PSP examples (audio), but in this example the data transfered via DMA and the audio loop is done in a task and not in an interrupt.

My problem is the HWI interrupt, so this example do not fit my problem.

0 Mariana over 15 years ago in reply to Fjs

TI__Mastermind 24340 points

Did you put the:

C64_enableIER (C64_EINT4);

at the end of main?

If you are check your configurations and initializations for the McASP and the codecs.

0 Fjs over 15 years ago in reply to Mariana

Intellectual 360 points

Hi Mariana,

thanks for your answer!

Yes, that is the bug. I used HWI_enable and not C64_enableIER(C64_EINT4). I am surprised about that command, because the OMAP-L138 has a C67x DSP and not a C64x device.

0 Mariana over 15 years ago in reply to Fjs

TI__Mastermind 24340 points

Hi Fjs,

I understand the confusion, that is because the C674x has a mixed core = C64x+ and C67x+...

I'm glad you got it working.

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McASP interrupt problem with OMAP-L138