CC2642R-Q1: Reading Incorrect ADC values

Bhargavi Mandava

Part Number: CC2642R-Q1

Hi,

I am pretty new to the TI platform and C programming. I need some help in understanding how to read ADC values from two pins.

I have the understanding of functions ADC_open, convert and close.

I used ADC_Open and ADC_Convert functions to open the driver and read the values from the two pins.

However, I am reading values 52685, I am not sure if I am reading the correct value or not.

What should be the values? should the convert the values I read again?

over 5 years ago

0 TER over 5 years ago

TI__Guru**** 317180 points

To be able to comment on the ADC value you are reading I need to know:

- How you have set up the ADC, more specifically which reference you are using

- What is the input? (in volt)

Please see http://dev.ti.com/tirex/explore/content/simplelink_cc2640r2_sdk_4_20_00_04/docs/tidrivers/doxygen/html/_a_d_c_8h.html

The function ADC_convertToMicroVolts also adjust the value according to the calibrated values stored on the chip.

0 Bhargavi Mandava over 5 years ago

Prodigy 20 points

This the program I am using.

https://dev.ti.com/tirex/explore/node?node=AE.xSdUh9C0VQHtzOYtk1w__eCfARaV__LATEST

0 TER over 5 years ago in reply to Bhargavi Mandava

TI__Guru**** 317180 points

From what I can see of the code you linked to is that it's just displaying the result of ADC_convert. The ADC has a gain/ offset error. The ADC is production tested and values to compensate for this is stored on the chip. But the compensation will be done in ADC_convertToMicroVolts, see the code for the function. Meaning that if the result form ADC_convert diverge it's expected.

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CC2642R-Q1: Reading Incorrect ADC values