topic Re: Cannot read VREF registers in Kinetis Design Studio

Cannot read VREF registers

robertpoor — Tue, 31 Jan 2017 06:40:21 GMT

I cannot access the VREF_SC register in KDS 3.20. When I select EmbSys Register => VREF => VREF => SC, I get the message "WARNING: Failed to read memory @ address 0x40074001"

My environment:

Mac OS X 10.12.2
KDS 3.2.0
FRDM-KL27Z development board with KL27Z64VLH4 processor
Segger JLINK.edu

In KDS, in the EmbSys Registers tile, it shows

Arch: SVD(CMSIS) Vendor: Freescale Chip: MLK27Z4 Board: --- none ---

... I believe this is correct. When I select Register VREF => VREF=> SC, in the console it prints:

WARNING: Failed to read memory @ address 0x40074001

... and the result is blank.

Note that it IS capable of printing other registers, e.g. ADC control registers, etc.

Any idea why this is failing, or how I can read the state of VREF_SC[VREFEN]?

Re: Cannot read VREF registers

jorge_a_vazquez — Fri, 03 Feb 2017 17:47:58 GMT

Hi Robert Poor

Could you share an screenshot of your EmbSys Registers? I noticed that you have:

Arch: SVD(CMSIS) Vendor: Freescale Chip: MK207Z4

But you should have selected in Freescale Chip: MKL27Z4

So, I not sure if you have selected the correct chip, could you check it please.

Best Regards
Jorge Alcala

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Re: Cannot read VREF registers

robertpoor — Mon, 06 Feb 2017 05:54:04 GMT

Jorge:

That was a typo on my part: I get this error when the chip is set to MKL27Z4. Screenshot attached.

Re: Cannot read VREF registers

HeMyFAE — Fri, 10 Feb 2017 17:19:35 GMT

You need to enable the clock gate for Vref Module.

SiM_SGCG4 (VREF) bit.