Reftrim Register Concerto

Arye Perlmutter

Expert 1195 points

Hello:

When I boot from RAM the Reftrim register is set with a value. When I boot from FLASH the Reftrim stays at zero.

Any explanation?

Regards Arye

over 12 years ago

0 Gautam Iyer over 12 years ago

Guru 192875 points

Hi Arye,

Are you calling the Device_cal() function? Also, are you writing a specific value in Reftrim register?

Regards,

Gautam

0 Arye Perlmutter over 12 years ago in reply to Gautam Iyer

Expert 1195 points

Hello Gautman: No I'm not calling Device_cal() and I'm not writing a specific value in Reftrim but when I run from RAM a value is written automatically into the register and I boot from FLASH nothing is written to the register. Regards Arye

0 Gautam Iyer over 12 years ago in reply to Arye Perlmutter

Guru 192875 points

No I'm not calling Device_cal() and I'm not writing a specific value in Reftrim but when I run from RAM a value is written automatically into the register and I boot from FLASH nothing is written to the register.

I'm unable to comment what might be happening here*; but do you observe any difference in ADC functionality?

*Lets wait for what one of my TI buddy has to say, about RAM and Flash Reftrim issue.

Regards,

Gautam

0 Arye Perlmutter over 12 years ago in reply to Gautam Iyer

Expert 1195 points

Hello Gautman:

Yes I observe a difference in ADC functionality. Sample values differ from FLASH to RAM.

Regards Arye

0 Devin Cottier over 12 years ago in reply to Arye Perlmutter

TI__Guru 60865 points

Hi Arye,

Are you connected to an emulator via CCS when running from RAM, but not connected when running from Flash? If so, CCS may be initializing the trim registers via GEL scripts.

Your final standalone application that runs from Flash will definitely need to explicitly call the Device_cal() function.

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Reftrim Register Concerto