rtc_clk_cal_ratio() function

Measure ratio between XTAL frequency and RTC slow clock frequency

Syntax

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Summary

Declaration

Definition

uint32_t rtc_clk_cal_ratio(rtc_cal_sel_t cal_clk, uint32_t slow_clk_cycles);

Implemented in rtc_time.c:113

Argument

Description

cal_clk

slow clock to be measured

slow_clk_cycles

number of slow clock cycles to average

average ratio between XTAL frequency and slow clock frequency, Q13.19 fixed point format, or 0 if calibration has timed out.

Code

Location

Referrer

uint32_t rtc_clk_cal_ratio(rtc_cal_sel_t cal_clk, uint32_t slowclk_cycles)

uint32_t rtc_clk_cal_ratio(rtc_cal_sel_t cal_clk, uint32_t slow_clk_cycles);

uint64_t cal_val = rtc_clk_cal_ratio(RTC_CAL_8MD256, XTAL_FREQ_EST_CYCLES);

rtc_clk_cal_ratio() is called by 1 function and calls 2 functions:

rtc_clk_cal_ratio()

rtc_clk_cal_ratio():

rtc_clk_cal_ratio()

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