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soc: nrf54l: fix LFXO INTCAP calculation formula

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The formula has been changed in latest version of the PS, adjust code
accordingly.

Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
This commit is contained in:
Gerard Marull-Paretas 2025-03-14 10:28:55 +01:00 • committed by Benjamin Cabé
commit c93860fae2
1 changed files with 2 additions and 2 deletions
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4
soc/nordic/nrf54l/soc.c
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@ -61,7 +61,7 @@ static inline void power_and_clock_configuration(void)
int32_t slope_k = (int32_t)(slope_field_k ^ slope_sign_k) - (int32_t)slope_sign_k;
/* As specified in the nRF54L15 PS:
* CAPVALUE = round( (CAPACITANCE - 4) * (FICR->XOSC32KTRIM.SLOPE + 0.765625 * 2^9)/(2^9)
* CAPVALUE = round( (2*CAPACITANCE - 12) * (FICR->XOSC32KTRIM.SLOPE + 0.765625 * 2^9)/(2^9)
* + FICR->XOSC32KTRIM.OFFSET/(2^6) );
* where CAPACITANCE is the desired capacitor value in pF, holding any
* value between 4 pF and 18 pF in 0.5 pF steps.
@ -82,7 +82,7 @@ static inline void power_and_clock_configuration(void)
* offset_k should be divided by 2^6, but to add it to value shifted by 2^9 we have to
* multiply it be 2^3.
*/
uint32_t mid_val = (cap_val_encoded - 4UL) * (uint32_t)(slope_k + 392UL)
uint32_t mid_val = (2UL * cap_val_encoded - 12UL) * (uint32_t)(slope_k + 392UL)
+ (offset_k << 3UL);
/* Get integer part of the INTCAP code */