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FCW in the impedance measurement examples

Question asked by CDiego on Dec 3, 2017
Latest reply on Jan 30, 2018 by NeoXu

Hi all,

 

I'm trying to understand step by step the imepdance measurement examples so I can confidently design my code. However, I don't undestand why 0.5 is added to the frequency control word in these codes. Is it an offset? I tried to find this in the user manual but I only manage to get the formula for the FCW and it doesn't mention this + 0.5.

 

This is the line of code:

 

* FCW = FREQ * 2^26 / 16e6 */
#define FCW ((uint32_t)(((uint64_t)FREQ << 26) / 16000000 + 0.5))

 

Thanks!!

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