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ulp: add note regarding limitation of ulp_set_wakeup_period in deep sleep mode

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Mahavir Jain
2018-11-26 16:32:41 +05:30
parent 3bc970c5f4
commit 588ecaae09
3 changed files with 5 additions and 2 deletions
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3
components/ulp/include/esp32/ulp.h
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@@ -898,6 +898,9 @@ esp_err_t ulp_run(uint32_t entry_point);
* i.e. period number 0. ULP program code can use SLEEP instruction to select
* which of the SENS_ULP_CP_SLEEP_CYCx_REG should be used for subsequent wakeups.
*
* However, please note that SLEEP instruction issued (from ULP program) while the system
* is in deep sleep mode does not have effect, and sleep cycle count 0 is used.
*
* @param period_index wakeup period setting number (0 - 4)
* @param period_us wakeup period, us
* @note The ULP FSM requires two clock cycles to wakeup before being able to run the program.