74 lines
2.3 KiB
C
74 lines
2.3 KiB
C
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// Copyright 2015-2016 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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// 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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#ifndef _DRIVER_ADC1_I2S_PRIVATE_H_
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#define _DRIVER_ADC1_I2S_PRIVATE_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "esp_err.h"
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/**
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* @brief Force power on for SAR ADC.
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* This function should be called for the scenario in which ADC are controlled by digital function like DMA.
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* When the ADC power is always on, RTC FSM can still be functional.
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* This is an internal API for I2S module to call to enable I2S-ADC function.
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* Note that adc_power_off() can still power down ADC.
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*/
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void adc_power_always_on();
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/**
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* @brief For I2S dma to claim the usage of ADC1.
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*
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* Other tasks will be forbidden to use ADC1 between ``adc1_i2s_mode_acquire`` and ``adc1_i2s_release``.
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* The I2S module may have to wait for a short time for the current conversion (if exist) to finish.
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*
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* @return
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* - ESP_OK success
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* - ESP_ERR_TIMEOUT reserved for future use. Currently the function will wait until success.
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*/
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esp_err_t adc1_i2s_mode_acquire();
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/**
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* @brief For ADC1 to claim the usage of ADC1.
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*
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* Other tasks will be forbidden to use ADC1 between ``adc1_adc_mode_acquire`` and ``adc1_i2s_release``.
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* The ADC1 may have to wait for some time for the I2S read operation to finish.
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*
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* @return
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* - ESP_OK success
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* - ESP_ERR_TIMEOUT reserved for future use. Currently the function will wait until success.
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*/
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esp_err_t adc1_adc_mode_acquire();
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/**
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* @brief to let other tasks use the ADC1 when I2S is not work.
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*
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* Other tasks will be forbidden to use ADC1 between ``adc1_adc/i2s_mode_acquire`` and ``adc1_i2s_release``.
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* Call this function to release the occupation of ADC1
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*
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* @return always return ESP_OK.
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*/
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esp_err_t adc1_lock_release();
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#ifdef __cplusplus
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}
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#endif
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#endif /*_DRIVER_ADC1_I2S_PRIVATE_H_*/
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