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deep sleep: clarify compatibility issues between wakeup sources

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ULP and touch FSMs in ESP32 revisions 0 and 1 do not operate correctly
if RTC_PERIPH power domain is force powered on (ESP_PD_OPTION_ON).

Both ULP and touch still work, but clock frequency of the ULP may be
incorrect and touch values may be off by considerable amount. As such,
when these wakeup modes are used, RTC_PERIPH power domain has to be set
to ESP_PD_OPTION_AUTO (or, in the current implementation,
ESP_PD_OPTION_OFF — though this will change in the future when _OFF will
actually *force* the power domain to be powered off).

Because EXT0 wakeup source requires RTC_PERIPH to be powered ON, mark
ULP and touch wakeup sources as incompatible with EXT0. Workaround for
this is to use EXT1 wakeup source instead, which offers similar or
better functions without having to keep RTC_PERIPH powered on.
This commit is contained in:
Ivan Grokhotkov
2017-01-27 23:36:52 +08:00
parent 611e510c49
commit 07ff47f103
3 changed files with 34 additions and 21 deletions
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16
components/esp32/include/esp_deep_sleep.h
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@@ -53,7 +53,10 @@ typedef enum {
/**
* @brief Enable wakeup by ULP coprocessor
* @note ulp wakeup conflicts with touch wakeup.
* @note In revisions 0 and 1 of the ESP32, ULP wakeup source
* can not be used when RTC_PERIPH power domain is forced
* to be powered on (ESP_PD_OPTION_ON) or when ext0 wakeup
* source is used.
* @return
* - ESP_OK on success
* - ESP_ERR_INVALID_STATE if ULP co-processor is not enabled or if wakeup triggers conflict
@@ -71,7 +74,12 @@ esp_err_t esp_deep_sleep_enable_timer_wakeup(uint64_t time_in_us);
/**
* @brief Enable wakeup by touch sensor
* @note Can not set touch wake-up if ulp or ext0 wake-up is enabled.
*
* @note In revisions 0 and 1 of the ESP32, touch wakeup source
* can not be used when RTC_PERIPH power domain is forced
* to be powered on (ESP_PD_OPTION_ON) or when ext0 wakeup
* source is used.
*
* @return
* - ESP_OK on success
* - ESP_ERR_INVALID_STATE if wakeup triggers conflict
@@ -90,7 +98,9 @@ esp_err_t esp_deep_sleep_enable_touchpad_wakeup();
* @note This function does not modify pin configuration. The pin is
* configured in esp_deep_sleep_start, immediately before
* entering deep sleep.
* @note This ext0 wakeup conflicts with touch wakeup.
*
* @note In revisions 0 and 1 of the ESP32, ext0 wakeup source
* can not be used together with touch or ULP wakeup sources.
*
* @param gpio_num GPIO number used as wakeup source. Only GPIOs which are have RTC
* functionality can be used: 0,2,4,12-15,25-27,32-39.