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esp32: Fix backwards compatibility for pre-v2.1 bootloaders

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Older bootloaders don't set RTC_XTAL_FREQ_REG or call rtc_clk_init(),
app needs to pick this up.

Reported at
https://esp32.com/viewtopic.php?f=2&t=3939&p=17836
This commit is contained in:
Angus Gratton
2017-12-15 10:32:53 +11:00
committed by Angus Gratton
parent 8688f0ec05
commit c69af42b96
6 changed files with 130 additions and 45 deletions
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15
components/soc/esp32/include/soc/rtc.h
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@@ -149,13 +149,24 @@ void rtc_clk_init(rtc_clk_config_t cfg);
/**
* @brief Get main XTAL frequency
*
* This is the value passed to rtc_clk_init function, or if the value was
* RTC_XTAL_FREQ_AUTO, the detected XTAL frequency.
* This is the value stored in RTC register RTC_XTAL_FREQ_REG by the bootloader. As passed to
* rtc_clk_init function, or if the value was RTC_XTAL_FREQ_AUTO, the detected
* XTAL frequency.
*
* @return XTAL frequency, one of rtc_xtal_freq_t
*/
rtc_xtal_freq_t rtc_clk_xtal_freq_get();
/**
* @brief Update XTAL frequency
*
* Updates the XTAL value stored in RTC_XTAL_FREQ_REG. Usually this value is ignored
* after startup.
*
* @param xtal_freq New frequency value
*/
void rtc_clk_xtal_freq_update(rtc_xtal_freq_t xtal_freq);
/**
* @brief Enable or disable 32 kHz XTAL oscillator
* @param en true to enable, false to disable