MCU-PLUS-SDK-AM263X: ADC results on am263x-cc

Eitan Halpern

When I run the example found in examples\drivers\adc\adc_soc_continuous\am263x-cc, I get seemingly the same results whether or not I'm connecting HSEC connecter pin 18 to 3.3V or Ground.

Is there something wrong with my hardware setup?

over 2 years ago

0 Ralph Jacobi over 2 years ago

TI__Guru*** 135355 points

Hello Eitan,

It looks to me like you are connected to Pin 18 (4th from top). ADC1_AIN1 (Channel 1) is Pin 20.

Best Regards,

Ralph Jacobi

0 Eitan Halpern over 2 years ago in reply to Ralph Jacobi

Prodigy 80 points

Using Pin 20 gives the same result.

Also, TI documentation states that pin 18 is used for this example:

0 Ralph Jacobi over 2 years ago in reply to Eitan Halpern

TI__Guru*** 135355 points

Of course the UART output of our own example is mislabeled... looking into this further, sorry.

0 Ralph Jacobi over 2 years ago in reply to Eitan Halpern

TI__Guru*** 135355 points

Hi Eitan,

I've recreated your issue with the AM263 CC. I tried the same example on the AM263 LP without any issues. I think the example was ported on the CC based on the LP, so I need to debug what changed between the two boards to produce a different result like what we are observing. I'll try and update tomorrow after doing more testing.

Best Regards,

Ralph Jacobi

+1 Ralph Jacobi over 2 years ago in reply to Eitan Halpern

TI__Guru*** 135355 points

Hello Eitan,

I've found the answer for this, and we have some clear improvements necessary to documentation.

The AM263 CC User's Guide has an addendum table for the E2 revision under Table A-5. This Table shows that ADC1_AIN0 is on Pin 12 of the HSEC board now. When I connected to Pin 12 and ran the example, it works as expected.

The clear miss here is that both SDK documentation and the SDK example file show Pin 18, so when both of us saw Pin 18 on the initial AM263 CC table we found, we were under the impression it was accurate and did not search deeper into the documentation.

I am also going to raise how to improve the Tables in the User's Guide to have some sort of marker to indicate which pins are subject to change based on revision as I fell into the same pitfall trap as you did.

Best Regards,

Ralph Jacobi

0 Eitan Halpern over 2 years ago in reply to Ralph Jacobi

Prodigy 80 points

Using Pin 12 works! Thank you

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MCU-PLUS-SDK-AM263X: ADC results on am263x-cc