kopia lustrzana https://github.com/espressif/esp-idf
98 wiersze
4.2 KiB
C
98 wiersze
4.2 KiB
C
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/*
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* SPDX-FileCopyrightText: 2019-2022 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 "driver/dac_types.h"
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#include "esp_err.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if SOC_DAC_SUPPORTED
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typedef struct dac_cosine_s *dac_cosine_handle_t; /*!< DAC cosine wave channel handle */
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/**
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* @brief DAC cosine channel configurations
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*
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*/
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typedef struct {
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dac_channel_t chan_id; /*!< The cosine wave channel id */
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uint32_t freq_hz; /*!< The frequency of cosine wave, unit: Hz.
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* The cosine wave generator is driven by RTC_FAST clock which is divide from RC_FAST,
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* With the default RTC clock, the minimum frequency of cosine wave is about 130 Hz,
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* Although it can support up to several MHz frequency theoretically,
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* the waveform will distort at high frequency due to the hardware limitation.
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* Typically not suggest to set the frequency higher than 200 KHz
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*/
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dac_cosine_clk_src_t clk_src; /*!< The clock source of the cosine wave generator, currently only support `DAC_COSINE_CLK_SRC_DEFAULT` */
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dac_cosine_atten_t atten; /*!< The attenuation of cosine wave amplitude */
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dac_cosine_phase_t phase; /*!< The phase of cosine wave, can only support DAC_COSINE_PHASE_0 or DAC_COSINE_PHASE_180, default as 0 while setting an unsupported phase */
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int8_t offset; /*!< The DC offset of cosine wave */
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struct {
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bool force_set_freq: 1; /*!< Force to set the cosine wave frequency */
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} flags; /*!< Flags of cosine mode */
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} dac_cosine_config_t;
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/**
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* @brief Allocate a new DAC cosine wave channel
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* @note Since there is only one cosine wave generator,
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* only the first channel can set the frequency of the cosine wave.
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* Normally, the latter one is not allowed to set a different frequency,
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* but the it can be forced to set by setting the bit `force_set_freq` in the configuration,
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* notice that another channel will be affected as well when the frequency is updated.
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*
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* @param[in] cos_cfg The configuration of cosine wave channel
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* @param[out] ret_handle The returned cosine wave channel handle
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* @return
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* - ESP_ERR_INVALID_ARG The input parameter is invalid
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* - ESP_ERR_INVALID_STATE The DAC channel has been registered already
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* - ESP_ERR_NO_MEM No memory for the DAC cosine wave channel resources
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* - ESP_OK Allocate the new DAC cosine wave channel success
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*/
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esp_err_t dac_cosine_new_channel(const dac_cosine_config_t *cos_cfg, dac_cosine_handle_t *ret_handle);
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/**
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* @brief Delete the DAC cosine wave channel
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*
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* @param[in] handle The DAC cosine wave channel handle
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* @return
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* - ESP_ERR_INVALID_ARG The input parameter is invalid
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* - ESP_ERR_INVALID_STATE The channel has already been deregistered
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* - ESP_OK Delete the cosine wave channel success
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*/
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esp_err_t dac_cosine_del_channel(dac_cosine_handle_t handle);
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/**
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* @brief Start outputting the cosine wave on the channel
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*
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* @param[in] handle The DAC cosine wave channel handle
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* @return
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* - ESP_ERR_INVALID_ARG The input parameter is invalid
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* - ESP_ERR_INVALID_STATE The channel has been started already
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* - ESP_OK Start the cosine wave success
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*/
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esp_err_t dac_cosine_start(dac_cosine_handle_t handle);
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/**
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* @brief Stop outputting the cosine wave on the channel
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*
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* @param[in] handle The DAC cosine wave channel handle
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* @return
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* - ESP_ERR_INVALID_ARG The input parameter is invalid
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* - ESP_ERR_INVALID_STATE The channel has been stopped already
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* - ESP_OK Stop the cosine wave success
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*/
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esp_err_t dac_cosine_stop(dac_cosine_handle_t handle);
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#endif // SOC_DAC_SUPPORTED
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#ifdef __cplusplus
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}
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#endif
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