esp-idf/components/ulp/ulp_common/include/ulp_common.h

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/*
* SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#ifndef __ULP_COMMON_H__
#define __ULP_COMMON_H__
#ifdef __cplusplus
extern "C" {
#endif
#include <stdint.h>
#include "esp_err.h"
#include "ulp_common_defs.h"
/**
* @brief Set one of ULP wakeup period values
*
* ULP coprocessor starts running the program when the wakeup timer counts up
* to a given value (called period). There are 5 period values which can be
* programmed into SENS_ULP_CP_SLEEP_CYCx_REG registers, x = 0..4 for ESP32, and
* one period value which can be programmed into RTC_CNTL_ULP_CP_TIMER_1_REG register for ESP32-S2/S3.
* By default, for ESP32, wakeup timer will use the period set into SENS_ULP_CP_SLEEP_CYC0_REG,
* 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.
*
* For ESP32-S2/S3 the SLEEP instruction not exist. Instead a WAKE instruction will be 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.
* Then additional 16 cycles are reserved after wakeup waiting until the 8M clock is stable.
* The FSM also requires two more clock cycles to go to sleep after the program execution is halted.
* The minimum wakeup period that may be set up for the ULP
* is equal to the total number of cycles spent on the above internal tasks.
* For a default configuration of the ULP running at 150kHz it makes about 133us.
* @return
* - ESP_OK on success
* - ESP_ERR_INVALID_ARG if period_index is out of range
*/
esp_err_t ulp_set_wakeup_period(size_t period_index, uint32_t period_us);
/**
* @brief Stop the ULP timer
*
* @note This will stop the ULP from waking up if halted, but will not abort any program
* currently executing on the ULP.
*/
void ulp_timer_stop(void);
/**
* @brief Resume the ULP timer
*
* @note This will resume an already configured timer, but does no other configuration
*
*/
void ulp_timer_resume(void);
#ifdef __cplusplus
}
#endif
#endif // __ULP_COMMON_H__