/
ulp_common.h
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/
ulp_common.h
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/*
* SPDX-FileCopyrightText: 2016-2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#pragma once
/* This file contains definitions that are common between esp32/ulp.h,
esp32s2/ulp.h and esp32s3/ulp.h
*/
#ifdef __cplusplus
extern "C" {
#endif
/**@{*/
#define ESP_ERR_ULP_BASE 0x1200 /*!< Offset for ULP-related error codes */
#define ESP_ERR_ULP_SIZE_TOO_BIG (ESP_ERR_ULP_BASE + 1) /*!< Program doesn't fit into RTC memory reserved for the ULP */
#define ESP_ERR_ULP_INVALID_LOAD_ADDR (ESP_ERR_ULP_BASE + 2) /*!< Load address is outside of RTC memory reserved for the ULP */
#define ESP_ERR_ULP_DUPLICATE_LABEL (ESP_ERR_ULP_BASE + 3) /*!< More than one label with the same number was defined */
#define ESP_ERR_ULP_UNDEFINED_LABEL (ESP_ERR_ULP_BASE + 4) /*!< Branch instructions references an undefined label */
#define ESP_ERR_ULP_BRANCH_OUT_OF_RANGE (ESP_ERR_ULP_BASE + 5) /*!< Branch target is out of range of B instruction (try replacing with BX) */
/**@}*/
union ulp_insn; // Declared in the chip-specific ulp.h header
typedef union ulp_insn ulp_insn_t;
/**
* @brief Resolve all macro references in a program and load it into RTC memory
* @param load_addr address where the program should be loaded, expressed in 32-bit words
* @param program ulp_insn_t array with the program
* @param psize size of the program, expressed in 32-bit words
* @return
* - ESP_OK on success
* - ESP_ERR_NO_MEM if auxiliary temporary structure can not be allocated
* - one of ESP_ERR_ULP_xxx if program is not valid or can not be loaded
*/
esp_err_t ulp_process_macros_and_load(uint32_t load_addr, const ulp_insn_t* program, size_t* psize);
/**
* @brief Load ULP program binary into RTC memory
*
* ULP program binary should have the following format (all values little-endian):
*
* 1. MAGIC, (value 0x00706c75, 4 bytes)
* 2. TEXT_OFFSET, offset of .text section from binary start (2 bytes)
* 3. TEXT_SIZE, size of .text section (2 bytes)
* 4. DATA_SIZE, size of .data section (2 bytes)
* 5. BSS_SIZE, size of .bss section (2 bytes)
* 6. (TEXT_OFFSET - 12) bytes of arbitrary data (will not be loaded into RTC memory)
* 7. .text section
* 8. .data section
*
* Linker script in components/ulp/ld/esp32.ulp.ld produces ELF files which
* correspond to this format. This linker script produces binaries with load_addr == 0.
*
* @param load_addr address where the program should be loaded, expressed in 32-bit words
* @param program_binary pointer to program binary
* @param program_size size of the program binary
* @return
* - ESP_OK on success
* - ESP_ERR_INVALID_ARG if load_addr is out of range
* - ESP_ERR_INVALID_SIZE if program_size doesn't match (TEXT_OFFSET + TEXT_SIZE + DATA_SIZE)
* - ESP_ERR_NOT_SUPPORTED if the magic number is incorrect
*/
esp_err_t ulp_load_binary(uint32_t load_addr, const uint8_t* program_binary, size_t program_size);
/**
* @brief Run the program loaded into RTC memory
* @param entry_point entry point, expressed in 32-bit words
* @return ESP_OK on success
*/
esp_err_t ulp_run(uint32_t entry_point);
/**
* @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.
* 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 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