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Merge branch 'bugfix/xtal_freq_estimation' into 'master'

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soc/rtc_clk: fix loss of precision in estimation of XTAL frequency

See merge request !1763
This commit is contained in:
Ivan Grokhotkov 2018-01-23 15:37:47 +08:00
parent 02821571dd 7c584e80b0
commit ffaf145056
1 changed files with 1 additions and 1 deletions
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components/soc/esp32/rtc_clk.c
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@ -589,7 +589,7 @@ static rtc_xtal_freq_t rtc_clk_xtal_freq_estimate()
* (shifted by RTC_CLK_CAL_FRACT bits). * (shifted by RTC_CLK_CAL_FRACT bits).
* Xtal frequency will be (cal_val * 8M / 256) / 2^19 * Xtal frequency will be (cal_val * 8M / 256) / 2^19
*/ */
uint32_t freq_mhz = (cal_val * (RTC_FAST_CLK_FREQ_APPROX / MHZ) / 256 ) >> RTC_CLK_CAL_FRACT; uint32_t freq_mhz = (cal_val * RTC_FAST_CLK_FREQ_APPROX / MHZ / 256 ) >> RTC_CLK_CAL_FRACT;
/* Guess the XTAL type. For now, only 40 and 26MHz are supported. /* Guess the XTAL type. For now, only 40 and 26MHz are supported.
*/ */
switch (freq_mhz) { switch (freq_mhz) {