MSPM0G3507-Q1: getMemResult vs ULLMEM.MEMRES

Ambroise Suter

Part Number: MSPM0G3507-Q1

Tool/software:

Hello,

If we call DL_ADC12_getMemResult(ADC0, 0), pReg is &ADC0->ULLMEM.MEMRES[0], and the result address is (&ADC0->ULLMEM.MEMRES[0]) + DL_ADC12_SVT_OFFSET, which will be read and return the 16-bit result.

If we use ADC0->ULLMEM.MEMRES[0], the result address is &ADC0->ULLMEM.MEMRES[0], note there is no offset DL_ADC12_SVT_OFFSET.

From the simulation result both are correct, but they are different implementations.

Is there a difference from a efficiency, size or other aspect?

Thank you and best regards,
Ambroise

5 months ago

0 Cash Hao11 5 months ago

TI__Mastermind 45685 points

Hi,

I think those two methods are the same. Since there will only be one actual address of the MEMRES register. The compiler takes over the address conversion. So, there should be no difference on the bottom layer.

Best regards,

Cash Hao

0 faqian huang 5 months ago

Prodigy 100 points

Why do you say one address of MEMRES register? Below two addresses are different:

&ADC0->ULLMEM.MEMRES[0]

(&ADC0->ULLMEM.MEMRES[0]) + DL_ADC12_SVT_OFFSET

0 Cash Hao11 5 months ago in reply to faqian huang

TI__Mastermind 45685 points

Hi,

I know there are two ways to approach this MEMRES register in the application code level. But for the compiler level, those two methods are pointing to the same address since there will only be one actual address for the MEMRES register.

Best regards,

Cash Hao

0 faqian huang 5 months ago in reply to Cash Hao11

Prodigy 100 points

Since ADC0->ULLMEM.MEMRES[0] is the ADC result of MEMCTL0, then

return ADC0->ULLMEM.MEMRES[0];

But from above code, why add the offset DL_ADC12_SVT_OFFSET?

0 Cash Hao11 5 months ago in reply to faqian huang

TI__Mastermind 45685 points

Hi,

For the description of DL_ADC12_SVT_OFFSET, it says 'This is an internal macro is used to resolve the offset to ADC12 SVT aperture'.

Best regards,

Cash Hao

0 faqian huang 5 months ago in reply to Cash Hao11

Prodigy 100 points

Do you know why there are two address for the one MEMRESx register?

0 Cash Hao11 5 months ago in reply to faqian huang

TI__Mastermind 45685 points

Hi,

No, I can check with the software team about why it requires to add DL_ADC12_SVT_OFFSET here.

Best regards,

Cash Hao

0 Cash Hao11 5 months ago in reply to Cash Hao11

TI__Mastermind 45685 points

Hi,

Confirmed with software team, the ADC0->ULLMEM.MEMRES[0]; is low speed access port. The (&ADC0->ULLMEM.MEMRES[0]) + DL_ADC12_SVT_OFFSET is high speed access port.

Low speed port used for configuration is OK.
But using these access port for ADC results read will cause data loss.

Best regards,

Cash Hao

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MSPM0G3507-Q1: getMemResult vs ULLMEM.MEMRES