ADC does not generate interrupts for touchscreen (AM3352 + Android ICS 4.0.3)

Alex Soukhman

Hi,

We have a custom board very similar to AM335x-evm starter kit, with custom lcd running ICS 4.0.3. We see that ADC recieves interrupt(TSCADC_IRQENB_FIFO1THRES) when we touch lcd and events from both FIFOs are generated.

But after a burst of events we do not get any more interrupts from ADC. Reading its status periodically from timer thread crashes when we touch lcd with error:

Unhandled fault: external abort on non-linefetch (0x1028) at 0xf9e0d0e4.

We look for suggestions where to look for the problem. It seems that all interrupts are not masked but we still do not get events.

Note: When we run newer Android (JB 4.2.2) it seems that the touchscreen works correclty. But then we got very poor Android performance with constant 100% CPU usage and decided to try earlier versions.

Thanks for help,

Alex.

over 12 years ago

0 Gururaja Hebbar over 12 years ago

TI__Intellectual 2725 points

>> Unhandled fault: external abort on non-linefetch (0x1028) at 0xf9e0d0e4.

This means that the Module is not accessible. Can you confirm if all the clocks to this module are active when accessing this register (0xf9e0d0e4 == FIFO0COUNT)

regards

Gururaja

0 Alex Soukhman over 12 years ago in reply to Gururaja Hebbar

Prodigy 100 points

This is internal ADC module, what kind of clocks should we look for?

Additional information:

We are running almost unmodified kernel as described in TI-Android-ICS-4.0.3-DevKit-3.0.1 DevelopersGuide
This module stops functioning after we touch the lcd.

Thanks.

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ADC does not generate interrupts for touchscreen (AM3352 + Android ICS 4.0.3)