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210 lines
7.0 KiB
C
210 lines
7.0 KiB
C
/*
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* Copyright (c) 2015 - 2019, Nordic Semiconductor ASA
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef NRFX_PDM_H__
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#define NRFX_PDM_H__
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#include <nrfx.h>
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#include <hal/nrf_pdm.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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* @defgroup nrfx_pdm PDM driver
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* @{
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* @ingroup nrf_pdm
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* @brief Pulse Density Modulation (PDM) peripheral driver.
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*/
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/** @brief Maximum supported PDM buffer size. */
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#define NRFX_PDM_MAX_BUFFER_SIZE 32767
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/** @brief PDM error type. */
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typedef enum
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{
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NRFX_PDM_NO_ERROR = 0, ///< No error.
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NRFX_PDM_ERROR_OVERFLOW = 1 ///< Overflow error.
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} nrfx_pdm_error_t;
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/** @brief PDM event structure. */
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typedef struct
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{
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bool buffer_requested; ///< Buffer request flag.
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int16_t * buffer_released; ///< Pointer to the released buffer. Can be NULL.
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nrfx_pdm_error_t error; ///< Error type.
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} nrfx_pdm_evt_t;
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/** @brief PDM interface driver configuration structure. */
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typedef struct
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{
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nrf_pdm_mode_t mode; ///< Interface operation mode.
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nrf_pdm_edge_t edge; ///< Sampling mode.
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uint8_t pin_clk; ///< CLK pin.
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uint8_t pin_din; ///< DIN pin.
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nrf_pdm_freq_t clock_freq; ///< Clock frequency.
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nrf_pdm_gain_t gain_l; ///< Left channel gain.
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nrf_pdm_gain_t gain_r; ///< Right channel gain.
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uint8_t interrupt_priority; ///< Interrupt priority.
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} nrfx_pdm_config_t;
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/**
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* @brief PDM driver default configuration.
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*
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* This configuration sets up PDM with the following options:
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* - mono mode
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* - data sampled on the clock falling edge
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* - frequency: 1.032 MHz
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* - standard gain
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*
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* @param[in] _pin_clk CLK output pin.
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* @param[in] _pin_din DIN input pin.
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*/
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#define NRFX_PDM_DEFAULT_CONFIG(_pin_clk, _pin_din) \
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{ \
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.mode = NRF_PDM_MODE_MONO, \
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.edge = NRF_PDM_EDGE_LEFTFALLING, \
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.pin_clk = _pin_clk, \
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.pin_din = _pin_din, \
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.clock_freq = NRF_PDM_FREQ_1032K, \
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.gain_l = NRF_PDM_GAIN_DEFAULT, \
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.gain_r = NRF_PDM_GAIN_DEFAULT, \
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.interrupt_priority = NRFX_PDM_DEFAULT_CONFIG_IRQ_PRIORITY \
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}
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/**
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* @brief Handler for the PDM interface ready events.
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*
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* This event handler is called on a buffer request, an error or when a buffer
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* is full and ready to be processed.
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*
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* @param[in] p_evt Pointer to the PDM event structure.
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*/
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typedef void (*nrfx_pdm_event_handler_t)(nrfx_pdm_evt_t const * p_evt);
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/**
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* @brief Function for initializing the PDM interface.
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*
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* @param[in] p_config Pointer to the structure with the initial configuration.
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* @param[in] event_handler Event handler provided by the user. Cannot be NULL.
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*
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* @retval NRFX_SUCCESS Initialization was successful.
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* @retval NRFX_ERROR_INVALID_STATE The driver is already initialized.
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* @retval NRFX_ERROR_INVALID_PARAM Invalid configuration was specified.
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*/
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nrfx_err_t nrfx_pdm_init(nrfx_pdm_config_t const * p_config,
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nrfx_pdm_event_handler_t event_handler);
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/**
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* @brief Function for uninitializing the PDM interface.
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*
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* This function stops PDM sampling, if it is in progress.
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*/
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void nrfx_pdm_uninit(void);
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/**
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* @brief Function for getting the address of a PDM interface task.
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*
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* @param[in] task Task.
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*
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* @return Task address.
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*/
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NRFX_STATIC_INLINE uint32_t nrfx_pdm_task_address_get(nrf_pdm_task_t task);
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/**
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* @brief Function for getting the state of the PDM interface.
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*
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* @retval true The PDM interface is enabled.
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* @retval false The PDM interface is disabled.
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*/
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NRFX_STATIC_INLINE bool nrfx_pdm_enable_check(void);
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/**
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* @brief Function for starting the PDM sampling.
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*
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* @retval NRFX_SUCCESS Sampling was started successfully or was already in progress.
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* @retval NRFX_ERROR_BUSY Previous start/stop operation is in progress.
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*/
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nrfx_err_t nrfx_pdm_start(void);
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/**
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* @brief Function for stopping the PDM sampling.
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*
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* When this function is called, the PDM interface is stopped after finishing
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* the current frame.
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* The event handler function might be called once more after calling this function.
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*
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* @retval NRFX_SUCCESS Sampling was stopped successfully or was already stopped before.
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* @retval NRFX_ERROR_BUSY Previous start/stop operation is in progress.
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*/
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nrfx_err_t nrfx_pdm_stop(void);
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/**
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* @brief Function for supplying the sample buffer.
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*
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* Call this function after every buffer request event.
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*
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* @param[in] buffer Pointer to the receive buffer. Cannot be NULL.
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* @param[in] buffer_length Length of the receive buffer in 16-bit words.
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*
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* @retval NRFX_SUCCESS The buffer was applied successfully.
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* @retval NRFX_ERROR_BUSY The buffer was already supplied or the peripheral is currently being stopped.
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* @retval NRFX_ERROR_INVALID_STATE The driver was not initialized.
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* @retval NRFX_ERROR_INVALID_PARAM Invalid parameters were provided.
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*/
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nrfx_err_t nrfx_pdm_buffer_set(int16_t * buffer, uint16_t buffer_length);
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#ifndef NRFX_DECLARE_ONLY
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NRFX_STATIC_INLINE uint32_t nrfx_pdm_task_address_get(nrf_pdm_task_t task)
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{
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return nrf_pdm_task_address_get(NRF_PDM, task);
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}
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NRFX_STATIC_INLINE bool nrfx_pdm_enable_check(void)
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{
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return nrf_pdm_enable_check(NRF_PDM);
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}
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#endif // NRFX_DECLARE_ONLY
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/** @} */
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void nrfx_pdm_irq_handler(void);
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#ifdef __cplusplus
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}
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#endif
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#endif // NRFX_PDM_H__
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