mirror of
https://github.com/espressif/esp-idf
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301 lines
14 KiB
C
301 lines
14 KiB
C
/*
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* SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#pragma once
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#include <stdint.h>
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#include <stdbool.h>
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#include "esp_err.h"
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#include "hal/pcnt_types.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @brief Type of PCNT unit handle
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*/
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typedef struct pcnt_unit_t *pcnt_unit_handle_t;
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/**
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* @brief Type of PCNT channel handle
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*/
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typedef struct pcnt_chan_t *pcnt_channel_handle_t;
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/**
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* @brief PCNT watch event data
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*/
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typedef struct {
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int watch_point_value; /*!< Watch point value that triggered the event */
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pcnt_unit_zero_cross_mode_t zero_cross_mode; /*!< Zero cross mode */
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} pcnt_watch_event_data_t;
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/**
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* @brief PCNT watch event callback prototype
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*
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* @note The callback function is invoked from an ISR context, so it should meet the restrictions of not calling any blocking APIs when implementing the callback.
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* e.g. must use ISR version of FreeRTOS APIs.
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*
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* @param[in] unit PCNT unit handle
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* @param[in] edata PCNT event data, fed by the driver
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* @param[in] user_ctx User data, passed from `pcnt_unit_register_event_callbacks()`
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* @return Whether a high priority task has been woken up by this function
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*/
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typedef bool (*pcnt_watch_cb_t)(pcnt_unit_handle_t unit, pcnt_watch_event_data_t *edata, void *user_ctx);
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/**
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* @brief Group of supported PCNT callbacks
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* @note The callbacks are all running under ISR environment
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* @note When CONFIG_PCNT_ISR_IRAM_SAFE is enabled, the callback itself and functions callbed by it should be placed in IRAM.
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*/
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typedef struct {
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pcnt_watch_cb_t on_reach; /*!< Called when PCNT unit counter reaches any watch point */
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} pcnt_event_callbacks_t;
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/**
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* @brief PCNT unit configuration
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*/
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typedef struct {
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int low_limit; /*!< Low limitation of the count unit, should be lower than 0 */
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int high_limit; /*!< High limitation of the count unit, should be higher than 0 */
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} pcnt_unit_config_t;
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/**
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* @brief PCNT channel configuration
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*/
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typedef struct {
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int edge_gpio_num; /*!< GPIO number used by the edge signal, input mode with pull up enabled. Set to -1 if unused */
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int level_gpio_num; /*!< GPIO number used by the level signal, input mode with pull up enabled. Set to -1 if unused */
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struct {
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uint32_t invert_edge_input: 1; /*!< Invert the input edge signal */
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uint32_t invert_level_input: 1; /*!< Invert the input level signal */
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uint32_t io_loop_back: 1; /*!< For debug/test, the signal output from the GPIO will be fed to the input path as well */
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} flags;
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} pcnt_chan_config_t;
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/**
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* @brief PCNT glitch filter configuration
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*/
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typedef struct {
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uint32_t max_glitch_ns; /*!< Pulse width smaller than this threshold will be treated as glitch and ignored, in the unit of ns */
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} pcnt_glitch_filter_config_t;
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/**
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* @brief Create a new PCNT unit, and return the handle
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*
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* @note The newly created PCNT unit is put into the stopped state.
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*
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* @param[in] config PCNT unit configuration
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* @param[out] ret_unit Returned PCNT unit handle
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* @return
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* - ESP_OK: Create PCNT unit successfully
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* - ESP_ERR_INVALID_ARG: Create PCNT unit failed because of invalid argument (e.g. high/low limit value out of the range)
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* - ESP_ERR_NO_MEM: Create PCNT unit failed because out of memory
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* - ESP_ERR_NOT_FOUND: Create PCNT unit failed because all PCNT units are used up and no more free one
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* - ESP_FAIL: Create PCNT unit failed because of other error
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*/
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esp_err_t pcnt_new_unit(const pcnt_unit_config_t *config, pcnt_unit_handle_t *ret_unit);
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/**
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* @brief Delete the PCNT unit handle
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*
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* @note Users must ensure that the PCNT unit is stopped before deleting the unit. Users can force a working unit into the stopped state via `pcnt_unit_stop()`.
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*
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* @param[in] unit PCNT unit handle created by `pcnt_new_unit()`
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* @return
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* - ESP_OK: Delete the PCNT unit successfully
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* - ESP_ERR_INVALID_ARG: Delete the PCNT unit failed because of invalid argument
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* - ESP_ERR_INVALID_STATE: Delete the PCNT unit failed because corresponding PCNT channels and/or watch points are still in working
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* - ESP_FAIL: Delete the PCNT unit failed because of other error
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*/
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esp_err_t pcnt_del_unit(pcnt_unit_handle_t unit);
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/**
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* @brief Set glitch filter for PCNT unit
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*
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* @note The glitch filter module is clocked from APB, and APB frequency can be changed during DFS, which in return make the filter out of action.
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* So this function will lazy-install a PM lock internally when the power management is enabled. With this lock, the APB frequency won't be changed.
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* The PM lock can only be uninstalled in `pcnt_del_unit()`.
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*
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* @param[in] unit PCNT unit handle created by `pcnt_new_unit()`
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* @param[in] config PCNT filter configuration, set config to NULL means disabling the filter function
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* @return
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* - ESP_OK: Set glitch filter successfully
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* - ESP_ERR_INVALID_ARG: Set glitch filter failed because of invalid argument (e.g. glitch width is too big)
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* - ESP_FAIL: Set glitch filter failed because of other error
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*/
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esp_err_t pcnt_unit_set_glitch_filter(pcnt_unit_handle_t unit, const pcnt_glitch_filter_config_t *config);
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/**
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* @brief Start the PCNT unit, the counter will start to count according to the edge and/or level input signals
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*
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* @note This function will acquire the PM lock when power management is enabled. Also see `pcnt_unit_set_glitch_filter()` for the condition of PM lock installation.
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* @note The number of calls to this function should be equal to the number of calls to `pcnt_unit_stop()`.
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* @note This function is allowed to run within ISR context
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* @note This function will be placed into IRAM if `CONFIG_PCNT_CTRL_FUNC_IN_IRAM`, so that it's allowed to be executed when Cache is disabled
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*
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* @param[in] unit PCNT unit handle created by `pcnt_new_unit()`
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* @return
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* - ESP_OK: Start PCNT unit successfully
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* - ESP_ERR_INVALID_ARG: Start PCNT unit failed because of invalid argument
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* - ESP_FAIL: Start PCNT unit failed because of other error
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*/
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esp_err_t pcnt_unit_start(pcnt_unit_handle_t unit);
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/**
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* @brief Stop PCNT from counting
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*
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* @note If power management is enabled, this function will release the PM lock acquired in `pcnt_unit_start()`.
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* Also see `pcnt_unit_set_glitch_filter()` for the condition of PM lock installation.
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* @note The stop operation won't clear the counter. Also see `pcnt_unit_clear_count()` for how to clear pulse count value.
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* @note The number of calls to this function should be equal to the number of calls to `pcnt_unit_start()`.
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* @note This function is allowed to run within ISR context
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* @note This function will be placed into IRAM if `CONFIG_PCNT_CTRL_FUNC_IN_IRAM`, so that it is allowed to be executed when Cache is disabled
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*
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* @param[in] unit PCNT unit handle created by `pcnt_new_unit()`
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* @return
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* - ESP_OK: Stop PCNT unit successfully
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* - ESP_ERR_INVALID_ARG: Stop PCNT unit failed because of invalid argument
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* - ESP_FAIL: Stop PCNT unit failed because of other error
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*/
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esp_err_t pcnt_unit_stop(pcnt_unit_handle_t unit);
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/**
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* @brief Clear PCNT pulse count value to zero
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*
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* @note It's recommended to call this function after adding a watch point by `pcnt_unit_add_watch_point()`, so that the newly added watch point is effective immediately.
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* @note This function is allowed to run within ISR context
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* @note This function will be placed into IRAM if `CONFIG_PCNT_CTRL_FUNC_IN_IRAM`, so that it's allowed to be executed when Cache is disabled
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*
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* @param[in] unit PCNT unit handle created by `pcnt_new_unit()`
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* @return
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* - ESP_OK: Clear PCNT pulse count successfully
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* - ESP_ERR_INVALID_ARG: Clear PCNT pulse count failed because of invalid argument
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* - ESP_FAIL: Clear PCNT pulse count failed because of other error
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*/
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esp_err_t pcnt_unit_clear_count(pcnt_unit_handle_t unit);
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/**
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* @brief Get PCNT count value
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*
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* @note This function is allowed to run within ISR context
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* @note This function will be placed into IRAM if `CONFIG_PCNT_CTRL_FUNC_IN_IRAM`, so that it's allowed to be executed when Cache is disabled
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*
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* @param[in] unit PCNT unit handle created by `pcnt_new_unit()`
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* @param[out] value Returned count value
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* @return
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* - ESP_OK: Get PCNT pulse count successfully
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* - ESP_ERR_INVALID_ARG: Get PCNT pulse count failed because of invalid argument
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* - ESP_FAIL: Get PCNT pulse count failed because of other error
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*/
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esp_err_t pcnt_unit_get_count(pcnt_unit_handle_t unit, int *value);
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/**
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* @brief Set event callbacks for PCNT unit
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*
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* @note User can deregister the previous callback by calling this function with an empty `cbs`.
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*
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* @param[in] unit PCNT unit handle created by `pcnt_new_unit()`
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* @param[in] cbs Group of callback functions
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* @param[in] user_data User data, which will be passed to callback functions directly
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* @return
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* - ESP_OK: Set event callbacks successfully
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* - ESP_ERR_INVALID_ARG: Set event callbacks failed because of invalid argument
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* - ESP_FAIL: Set event callbacks failed because of other error
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*/
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esp_err_t pcnt_unit_register_event_callbacks(pcnt_unit_handle_t unit, const pcnt_event_callbacks_t *cbs, void *user_data);
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/**
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* @brief Add a watch point for PCNT unit, PCNT will generate an event when the counter value reaches the watch point value
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*
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* @note The number of calls to this function should be equal to the number of calls to `pcnt_unit_remove_watch_point()`, otherwise the unit can't be deleted
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*
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* @param[in] unit PCNT unit handle created by `pcnt_new_unit()`
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* @param[in] watch_point Value to be watched
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* @return
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* - ESP_OK: Add watch point successfully
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* - ESP_ERR_INVALID_ARG: Add watch point failed because of invalid argument (e.g. the value to be watched is out of the limitation set in `pcnt_unit_config_t`)
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* - ESP_ERR_INVALID_STATE: Add watch point failed because the same watch point has already been added
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* - ESP_ERR_NOT_FOUND: Add watch point failed because no more hardware watch point can be configured
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* - ESP_FAIL: Add watch point failed because of other error
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*/
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esp_err_t pcnt_unit_add_watch_point(pcnt_unit_handle_t unit, int watch_point);
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/**
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* @brief Remove a watch point for PCNT unit
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*
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* @note The number of calls to this function should be equal to the number of calls to `pcnt_unit_add_watch_point()`, otherwise the unit can't be deleted
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*
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* @param[in] unit PCNT unit handle created by `pcnt_new_unit()`
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* @param[in] watch_point Watch point value
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* @return
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* - ESP_OK: Remove watch point successfully
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* - ESP_ERR_INVALID_ARG: Remove watch point failed because of invalid argument
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* - ESP_ERR_INVALID_STATE: Remove watch point failed because the watch point was not added by `pcnt_unit_add_watch_point()` yet
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* - ESP_FAIL: Remove watch point failed because of other error
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*/
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esp_err_t pcnt_unit_remove_watch_point(pcnt_unit_handle_t unit, int watch_point);
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/**
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* @brief Create PCNT channel for specific unit, each PCNT has several channels associated with it
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*
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* @param[in] unit PCNT unit handle created by `pcnt_new_unit()`
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* @param[in] config PCNT channel configuration
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* @param[out] ret_chan Returned channel handle
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* @return
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* - ESP_OK: Create PCNT channel successfully
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* - ESP_ERR_INVALID_ARG: Create PCNT channel failed because of invalid argument
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* - ESP_ERR_NO_MEM: Create PCNT channel failed because of insufficient memory
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* - ESP_ERR_NOT_FOUND: Create PCNT channel failed because all PCNT channels are used up and no more free one
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* - ESP_FAIL: Create PCNT channel failed because of other error
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*/
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esp_err_t pcnt_new_channel(pcnt_unit_handle_t unit, const pcnt_chan_config_t *config, pcnt_channel_handle_t *ret_chan);
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/**
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* @brief Delete the PCNT channel
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*
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* @param[in] chan PCNT channel handle created by `pcnt_new_channel()`
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* @return
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* - ESP_OK: Delete the PCNT channel successfully
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* - ESP_ERR_INVALID_ARG: Delete the PCNT channel failed because of invalid argument
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* - ESP_FAIL: Delete the PCNT channel failed because of other error
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*/
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esp_err_t pcnt_del_channel(pcnt_channel_handle_t chan);
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/**
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* @brief Set channel actions when edge signal changes (e.g. falling or rising edge occurred).
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* The edge signal is input from the `edge_gpio_num` configured in `pcnt_chan_config_t`.
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* We use these actions to control when and how to change the counter value.
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*
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* @param[in] chan PCNT channel handle created by `pcnt_new_channel()`
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* @param[in] pos_act Action on posedge signal
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* @param[in] neg_act Action on negedge signal
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* @return
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* - ESP_OK: Set edge action for PCNT channel successfully
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* - ESP_ERR_INVALID_ARG: Set edge action for PCNT channel failed because of invalid argument
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* - ESP_FAIL: Set edge action for PCNT channel failed because of other error
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*/
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esp_err_t pcnt_channel_set_edge_action(pcnt_channel_handle_t chan, pcnt_channel_edge_action_t pos_act, pcnt_channel_edge_action_t neg_act);
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/**
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* @brief Set channel actions when level signal changes (e.g. signal level goes from high to low).
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* The level signal is input from the `level_gpio_num` configured in `pcnt_chan_config_t`.
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* We use these actions to control when and how to change the counting mode.
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*
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* @param[in] chan PCNT channel handle created by `pcnt_new_channel()`
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* @param[in] high_act Action on high level signal
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* @param[in] low_act Action on low level signal
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* @return
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* - ESP_OK: Set level action for PCNT channel successfully
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* - ESP_ERR_INVALID_ARG: Set level action for PCNT channel failed because of invalid argument
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* - ESP_FAIL: Set level action for PCNT channel failed because of other error
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*/
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esp_err_t pcnt_channel_set_level_action(pcnt_channel_handle_t chan, pcnt_channel_level_action_t high_act, pcnt_channel_level_action_t low_act);
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#ifdef __cplusplus
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}
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#endif
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