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esp32c2/clk_cali: fix rtc slow clk cali logic

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This commit is contained in:
jingli 2022-08-15 16:31:54 +08:00
parent 6d1f1eccfb
commit d3d1d4e1df
1 changed files with 11 additions and 6 deletions
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17
components/esp_hw_support/port/esp32c2/rtc_time.c
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@ -57,16 +57,21 @@ uint32_t rtc_clk_cal_internal(rtc_cal_sel_t cal_clk, uint32_t slowclk_cycles)
rtc_clk_8m_enable(true, true);
clk_ll_rc_fast_d256_digi_enable();
}
/* Prepare calibration */
REG_SET_FIELD(TIMG_RTCCALICFG_REG(0), TIMG_RTC_CALI_CLK_SEL, cal_clk);
/* There may be another calibration process already running during we call this function,
* so we should wait the last process is done.
*/
if (!GET_PERI_REG_MASK(TIMG_RTCCALICFG2_REG(0), TIMG_RTC_CALI_TIMEOUT)) {
if (GET_PERI_REG_MASK(TIMG_RTCCALICFG_REG(0), TIMG_RTC_CALI_START_CYCLING)) {
while (!GET_PERI_REG_MASK(TIMG_RTCCALICFG_REG(0), TIMG_RTC_CALI_RDY));
}
if (GET_PERI_REG_MASK(TIMG_RTCCALICFG_REG(0), TIMG_RTC_CALI_START_CYCLING)) {
/**
* Set a small timeout threshold to accelerate the generation of timeout.
* The internal circuit will be reset when the timeout occurs and will not affect the next calibration.
*/
REG_SET_FIELD(TIMG_RTCCALICFG2_REG(0), TIMG_RTC_CALI_TIMEOUT_THRES, 1);
while (!GET_PERI_REG_MASK(TIMG_RTCCALICFG_REG(0), TIMG_RTC_CALI_RDY)
&& !GET_PERI_REG_MASK(TIMG_RTCCALICFG2_REG(0), TIMG_RTC_CALI_TIMEOUT));
}
/* Prepare calibration */
REG_SET_FIELD(TIMG_RTCCALICFG_REG(0), TIMG_RTC_CALI_CLK_SEL, cal_clk);
CLEAR_PERI_REG_MASK(TIMG_RTCCALICFG_REG(0), TIMG_RTC_CALI_START_CYCLING);
REG_SET_FIELD(TIMG_RTCCALICFG_REG(0), TIMG_RTC_CALI_MAX, slowclk_cycles);
/* Figure out how long to wait for calibration to finish */