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esp32: select 8M clock as RTC_FAST_CLK on startup

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Even though RTC_CLK_CONFIG_DEFAULT correctly had RTC_FAST_FREQ_8M as the
fast clock, the bootloader modified fast_freq field to the currently
selected RTC_FAST_CLK (so that the clock choice is not affected by the
bootloader). The application startup code never switched to 8M clock,
which caused the default (XTAL/4) to be used as RTC_FAST_CLK. This had
caused a number of issues, such as touch pads not working in deep sleep.

Fixes https://github.com/espressif/esp-idf/issues/542.
Ref TW12053.
This commit is contained in:
Ivan Grokhotkov 2017-04-27 12:42:56 +08:00
parent 46fa2cfb46
commit 1c3b40adeb
1 changed files with 1 additions and 0 deletions
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components/esp32/clk.c
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@ -43,6 +43,7 @@ void esp_clk_init(void)
{ {
rtc_config_t cfg = RTC_CONFIG_DEFAULT(); rtc_config_t cfg = RTC_CONFIG_DEFAULT();
rtc_init(cfg); rtc_init(cfg);
rtc_clk_fast_freq_set(RTC_FAST_FREQ_8M);
#ifdef CONFIG_ESP32_RTC_CLOCK_SOURCE_EXTERNAL_CRYSTAL #ifdef CONFIG_ESP32_RTC_CLOCK_SOURCE_EXTERNAL_CRYSTAL
select_rtc_slow_clk(RTC_SLOW_FREQ_32K_XTAL); select_rtc_slow_clk(RTC_SLOW_FREQ_32K_XTAL);