399 lines
13 KiB
C
399 lines
13 KiB
C
// Copyright 2015-2019 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#pragma once
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#include "esp_types.h"
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#include "esp_err.h"
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#include "esp_intr_alloc.h"
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#include "freertos/FreeRTOS.h"
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#include "driver/gpio.h"
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#include "hal/pcnt_types.h"
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#include "soc/pcnt_periph.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef intr_handle_t pcnt_isr_handle_t;
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/**
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* @brief Configure Pulse Counter unit
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* @note
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* This function will disable three events: PCNT_EVT_L_LIM, PCNT_EVT_H_LIM, PCNT_EVT_ZERO.
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*
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* @param pcnt_config Pointer of Pulse Counter unit configure parameter
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*
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_STATE pcnt driver already initialized
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* - ESP_ERR_INVALID_ARG Parameter error
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*/
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esp_err_t pcnt_unit_config(const pcnt_config_t *pcnt_config);
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/**
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* @brief Get pulse counter value
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*
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* @param pcnt_unit Pulse Counter unit number
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* @param count Pointer to accept counter value
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*
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_STATE pcnt driver has not been initialized
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* - ESP_ERR_INVALID_ARG Parameter error
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*/
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esp_err_t pcnt_get_counter_value(pcnt_unit_t pcnt_unit, int16_t *count);
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/**
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* @brief Pause PCNT counter of PCNT unit
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*
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* @param pcnt_unit PCNT unit number
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*
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_STATE pcnt driver has not been initialized
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* - ESP_ERR_INVALID_ARG Parameter error
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*/
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esp_err_t pcnt_counter_pause(pcnt_unit_t pcnt_unit);
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/**
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* @brief Resume counting for PCNT counter
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*
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* @param pcnt_unit PCNT unit number, select from pcnt_unit_t
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*
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_STATE pcnt driver has not been initialized
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* - ESP_ERR_INVALID_ARG Parameter error
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*/
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esp_err_t pcnt_counter_resume(pcnt_unit_t pcnt_unit);
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/**
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* @brief Clear and reset PCNT counter value to zero
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*
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* @param pcnt_unit PCNT unit number, select from pcnt_unit_t
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*
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_STATE pcnt driver has not been initialized
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* - ESP_ERR_INVALID_ARG Parameter error
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*/
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esp_err_t pcnt_counter_clear(pcnt_unit_t pcnt_unit);
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/**
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* @brief Enable PCNT interrupt for PCNT unit
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* @note
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* Each Pulse counter unit has five watch point events that share the same interrupt.
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* Configure events with pcnt_event_enable() and pcnt_event_disable()
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*
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* @param pcnt_unit PCNT unit number
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*
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_STATE pcnt driver has not been initialized
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* - ESP_ERR_INVALID_ARG Parameter error
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*/
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esp_err_t pcnt_intr_enable(pcnt_unit_t pcnt_unit);
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/**
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* @brief Disable PCNT interrupt for PCNT unit
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*
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* @param pcnt_unit PCNT unit number
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*
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_STATE pcnt driver has not been initialized
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* - ESP_ERR_INVALID_ARG Parameter error
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*/
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esp_err_t pcnt_intr_disable(pcnt_unit_t pcnt_unit);
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/**
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* @brief Enable PCNT event of PCNT unit
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*
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* @param unit PCNT unit number
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* @param evt_type Watch point event type.
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* All enabled events share the same interrupt (one interrupt per pulse counter unit).
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_STATE pcnt driver has not been initialized
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* - ESP_ERR_INVALID_ARG Parameter error
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*/
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esp_err_t pcnt_event_enable(pcnt_unit_t unit, pcnt_evt_type_t evt_type);
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/**
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* @brief Disable PCNT event of PCNT unit
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*
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* @param unit PCNT unit number
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* @param evt_type Watch point event type.
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* All enabled events share the same interrupt (one interrupt per pulse counter unit).
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_STATE pcnt driver has not been initialized
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* - ESP_ERR_INVALID_ARG Parameter error
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*/
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esp_err_t pcnt_event_disable(pcnt_unit_t unit, pcnt_evt_type_t evt_type);
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/**
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* @brief Set PCNT event value of PCNT unit
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*
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* @param unit PCNT unit number
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* @param evt_type Watch point event type.
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* All enabled events share the same interrupt (one interrupt per pulse counter unit).
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*
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* @param value Counter value for PCNT event
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*
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_STATE pcnt driver has not been initialized
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* - ESP_ERR_INVALID_ARG Parameter error
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*/
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esp_err_t pcnt_set_event_value(pcnt_unit_t unit, pcnt_evt_type_t evt_type, int16_t value);
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/**
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* @brief Get PCNT event value of PCNT unit
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*
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* @param unit PCNT unit number
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* @param evt_type Watch point event type.
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* All enabled events share the same interrupt (one interrupt per pulse counter unit).
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* @param value Pointer to accept counter value for PCNT event
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*
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_STATE pcnt driver has not been initialized
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* - ESP_ERR_INVALID_ARG Parameter error
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*/
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esp_err_t pcnt_get_event_value(pcnt_unit_t unit, pcnt_evt_type_t evt_type, int16_t *value);
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/**
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* @brief Unregister PCNT interrupt handler (registered by pcnt_isr_register), the handler is an ISR.
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* The handler will be attached to the same CPU core that this function is running on.
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* If the interrupt service is registered by pcnt_isr_service_install, please call pcnt_isr_service_uninstall instead
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*
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* @param handle handle to unregister the ISR service.
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*
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* @return
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* - ESP_OK Success
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* - ESP_ERR_NOT_FOUND Can not find the interrupt that matches the flags.
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* - ESP_ERR_INVALID_ARG Function pointer error.
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*/
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esp_err_t pcnt_isr_unregister(pcnt_isr_handle_t handle);
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/**
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* @brief Register PCNT interrupt handler, the handler is an ISR.
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* The handler will be attached to the same CPU core that this function is running on.
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* Please do not use pcnt_isr_service_install if this function was called.
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*
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* @param fn Interrupt handler function.
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* @param arg Parameter for handler function
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* @param intr_alloc_flags Flags used to allocate the interrupt. One or multiple (ORred)
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* ESP_INTR_FLAG_* values. See esp_intr_alloc.h for more info.
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* @param handle Pointer to return handle. If non-NULL, a handle for the interrupt will
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* be returned here. Calling pcnt_isr_unregister to unregister this ISR service if needed,
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* but only if the handle is not NULL.
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*
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* @return
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* - ESP_OK Success
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* - ESP_ERR_NOT_FOUND Can not find the interrupt that matches the flags.
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* - ESP_ERR_INVALID_ARG Function pointer error.
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*/
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esp_err_t pcnt_isr_register(void (*fn)(void *), void *arg, int intr_alloc_flags, pcnt_isr_handle_t *handle);
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/**
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* @brief Configure PCNT pulse signal input pin and control input pin
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*
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* @param unit PCNT unit number
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* @param channel PCNT channel number
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* @param pulse_io Pulse signal input GPIO
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* @param ctrl_io Control signal input GPIO
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*
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* @note Set the signal input to PCNT_PIN_NOT_USED if unused.
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*
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_STATE pcnt driver has not been initialized
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* - ESP_ERR_INVALID_ARG Parameter error
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*/
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esp_err_t pcnt_set_pin(pcnt_unit_t unit, pcnt_channel_t channel, int pulse_io, int ctrl_io);
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/**
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* @brief Enable PCNT input filter
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*
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* @param unit PCNT unit number
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*
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_STATE pcnt driver has not been initialized
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* - ESP_ERR_INVALID_ARG Parameter error
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*/
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esp_err_t pcnt_filter_enable(pcnt_unit_t unit);
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/**
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* @brief Disable PCNT input filter
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*
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* @param unit PCNT unit number
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*
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_STATE pcnt driver has not been initialized
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* - ESP_ERR_INVALID_ARG Parameter error
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*/
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esp_err_t pcnt_filter_disable(pcnt_unit_t unit);
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/**
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* @brief Set PCNT filter value
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*
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* @param unit PCNT unit number
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* @param filter_val PCNT signal filter value, counter in APB_CLK cycles.
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* Any pulses lasting shorter than this will be ignored when the filter is enabled.
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* @note
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* filter_val is a 10-bit value, so the maximum filter_val should be limited to 1023.
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*
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_STATE pcnt driver has not been initialized
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* - ESP_ERR_INVALID_ARG Parameter error
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*/
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esp_err_t pcnt_set_filter_value(pcnt_unit_t unit, uint16_t filter_val);
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/**
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* @brief Get PCNT filter value
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*
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* @param unit PCNT unit number
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* @param filter_val Pointer to accept PCNT filter value.
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*
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_STATE pcnt driver has not been initialized
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* - ESP_ERR_INVALID_ARG Parameter error
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*/
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esp_err_t pcnt_get_filter_value(pcnt_unit_t unit, uint16_t *filter_val);
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/**
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* @brief Set PCNT counter mode
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*
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* @param unit PCNT unit number
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* @param channel PCNT channel number
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* @param pos_mode Counter mode when detecting positive edge
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* @param neg_mode Counter mode when detecting negative edge
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* @param hctrl_mode Counter mode when control signal is high level
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* @param lctrl_mode Counter mode when control signal is low level
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*
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_STATE pcnt driver has not been initialized
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* - ESP_ERR_INVALID_ARG Parameter error
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*/
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esp_err_t pcnt_set_mode(pcnt_unit_t unit, pcnt_channel_t channel,
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pcnt_count_mode_t pos_mode, pcnt_count_mode_t neg_mode,
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pcnt_ctrl_mode_t hctrl_mode, pcnt_ctrl_mode_t lctrl_mode);
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/**
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* @brief Add ISR handler for specified unit.
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*
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* Call this function after using pcnt_isr_service_install() to
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* install the PCNT driver's ISR handler service.
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*
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* The ISR handlers do not need to be declared with IRAM_ATTR,
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* unless you pass the ESP_INTR_FLAG_IRAM flag when allocating the
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* ISR in pcnt_isr_service_install().
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*
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* This ISR handler will be called from an ISR. So there is a stack
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* size limit (configurable as "ISR stack size" in menuconfig). This
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* limit is smaller compared to a global PCNT interrupt handler due
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* to the additional level of indirection.
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*
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* @param unit PCNT unit number
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* @param isr_handler Interrupt handler function.
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* @param args Parameter for handler function
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*
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_STATE pcnt driver has not been initialized
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* - ESP_ERR_INVALID_ARG Parameter error
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*/
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esp_err_t pcnt_isr_handler_add(pcnt_unit_t unit, void(*isr_handler)(void *), void *args);
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/**
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* @brief Install PCNT ISR service.
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* @note We can manage different interrupt service for each unit.
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* This function will use the default ISR handle service, Calling pcnt_isr_service_uninstall to
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* uninstall the default service if needed. Please do not use pcnt_isr_register if this function was called.
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*
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* @param intr_alloc_flags Flags used to allocate the interrupt. One or multiple (ORred)
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* ESP_INTR_FLAG_* values. See esp_intr_alloc.h for more info.
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*
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_STATE pcnt driver has not been initialized
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* - ESP_ERR_NO_MEM No memory to install this service
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* - ESP_ERR_INVALID_STATE ISR service already installed
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*/
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esp_err_t pcnt_isr_service_install(int intr_alloc_flags);
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/**
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* @brief Uninstall PCNT ISR service, freeing related resources.
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*/
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void pcnt_isr_service_uninstall(void);
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/**
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* @brief Delete ISR handler for specified unit.
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*
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* @param unit PCNT unit number
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*
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_STATE pcnt driver has not been initialized
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* - ESP_ERR_INVALID_ARG Parameter error
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*/
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esp_err_t pcnt_isr_handler_remove(pcnt_unit_t unit);
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/**
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* @addtogroup pcnt-examples
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*
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* @{
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*
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* EXAMPLE OF PCNT CONFIGURATION
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* ==============================
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* @code{c}
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* //1. Config PCNT unit
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* pcnt_config_t pcnt_config = {
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* .pulse_gpio_num = 4, //set gpio4 as pulse input gpio
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* .ctrl_gpio_num = 5, //set gpio5 as control gpio
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* .channel = PCNT_CHANNEL_0, //use unit 0 channel 0
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* .lctrl_mode = PCNT_MODE_REVERSE, //when control signal is low, reverse the primary counter mode(inc->dec/dec->inc)
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* .hctrl_mode = PCNT_MODE_KEEP, //when control signal is high, keep the primary counter mode
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* .pos_mode = PCNT_COUNT_INC, //increment the counter
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* .neg_mode = PCNT_COUNT_DIS, //keep the counter value
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* .counter_h_lim = 10,
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* .counter_l_lim = -10,
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* };
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* pcnt_unit_config(&pcnt_config); //init unit
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* @endcode
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*
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* EXAMPLE OF PCNT EVENT SETTING
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* ==============================
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* @code{c}
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* //2. Configure PCNT watchpoint event.
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* pcnt_set_event_value(PCNT_UNIT_0, PCNT_EVT_THRES_1, 5); //set thres1 value
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* pcnt_event_enable(PCNT_UNIT_0, PCNT_EVT_THRES_1); //enable thres1 event
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* @endcode
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*
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* For more examples please refer to PCNT example code in IDF_PATH/examples
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*
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* @}
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*/
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#ifdef __cplusplus
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}
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#endif
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