Adc1OffsetSelfCal() failing

Michael He

I am working with the F28M35H52C1 RevB controlCard.

According to the Silicon Errata document, it is recommended to call Adc1OffsetSelfCal() and Adc2OffsetSelfCal() after calling Device_cal() when starting up the ADC. I put that into my code, but now the device does not boot up.

Tracing the Adc1OffsetSelfCal function with the debugger, it seems to never get past DELAY_US(ADC_usDELAY). After reaching this line, if I pause the C28 core, I land at the following line in the disassembly:

3fefa6: 6F00

Any help on this issue is greatly appreciated. Thanks.

over 12 years ago

0 Gautam Iyer over 12 years ago

Guru 192875 points

Hi Michael,

Does it complete the execution of Delay_US or is it stuck in between the delay subroutine?

Regards,

Gautam

0 Michael He over 12 years ago in reply to Gautam Iyer

Expert 2170 points

I can't be entirely sure, as when I try to step into the function, all the step-through-code buttons no longer work. However, a breakpoint set right after the function is never reached, so I'm guessing it does not complete.

0 Gautam Iyer over 12 years ago in reply to Michael He

Guru 192875 points

So did you try commenting the delay function?

0 Michael He over 12 years ago in reply to Gautam Iyer

Expert 2170 points

I just tried it, and the function successfully returns. (Note for other people: I did have to undo some of the ADC configurations set in that function).

If that is not a critical part of the code, is it safe to just leave it commented out? It's being used as a delay before starting ADC sampling. Will removing that delay still give a proper calibration?

0 Gautam Iyer over 12 years ago in reply to Michael He

Guru 192875 points

Will removing that delay still give a proper calibration?

Delay is recommended for being completely sure. I just wanted to check where the issue was... now that we've spotted it. There's some issue with the Delay function. For now you can create your own delay routine using for loop.

I'll check into this and forward you the delay routine working on my PC.

Regards,

Gautam

0 Michael He over 11 years ago in reply to Gautam Iyer

Expert 2170 points

Hi Gautam,

I realized that I still have the delay commented out, and forgot to follow up. Did you find a resolution for this issue?

Thanks

0 Michael He over 11 years ago in reply to Michael He

Expert 2170 points

Hi Gautam,

Just wanted to let you know that the problem got fixed! It turns out the DELAY_US function was not loaded into RAM yet, because I called this function before memcpy got called. After moving the memcpy function to the first line of main(), the problem is fixed. Thanks for your help!

Mike

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Adc1OffsetSelfCal() failing