PDMCC26XX.h

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/*
 * Copyright (c) 2015-2019, Texas Instruments Incorporated
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * *  Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * *  Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * *  Neither the name of Texas Instruments Incorporated nor the names of
 *    its contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#ifndef ti_drivers_pdm_PDMCC26XX__include
#define ti_drivers_pdm_PDMCC26XX__include

#include <ti/drivers/dpl/HwiP.h>
#include <ti/drivers/dpl/SemaphoreP.h>

#include <ti/drivers/PIN.h>
#include <ti/drivers/Power.h>
#include <ti/drivers/power/PowerCC26XX.h>

#ifdef __cplusplus
extern "C" {
#endif

/*********************************************************************
 * CONSTANTS
 */

#ifndef PDM_TASK_STACK_SIZE
#define PDM_TASK_STACK_SIZE             850
#endif

#define PCM_SAMPLE_SIZE                 16 // Only 16 bits supported for now

#define PCM_COMPRESSION_RATE            4

#define MINIMUM_PDM_BUFFER_QUEUE_DEPTH  3

#define PCM_METADATA_SIZE               sizeof(PDMCC26XX_metaData)

/*********************************************************************
 * TYPEDEFS
 */

typedef struct {
    uint8_t seqNum;     
    int8_t si;          
    int16_t pv;         
} PDMCC26XX_metaData;

typedef struct {
    PDMCC26XX_metaData metaData;    
    uint8_t pBuffer[];              
} PDMCC26XX_pcmBuffer;

typedef void *(*PDMCC26XX_MallocFxn)(size_t memSize);

typedef void (*PDMCC26XX_FreeFxn)(void *ptr, size_t memSize);

typedef bool (*PDMCC26XX_Pdm2PcmFxn)(const void *pdmInBuffer, uint32_t *decimationState, const int32_t *biquadCoefficients, int16_t *pcmOutBuffer);

typedef struct {
    void                        *object;

    void                const   *hwAttrs;
} PDMCC26XX_Config;

extern const PDMCC26XX_Config PDMCC26XX_config[];

typedef struct {
    PIN_Id           micPower;
    int              taskPriority;
} PDMCC26XX_HWAttrs;

typedef PDMCC26XX_Config *PDMCC26XX_Handle;

typedef enum {
    PDMCC26XX_STREAM_IDLE,              
    PDMCC26XX_STREAM_BLOCK_READY,       
    PDMCC26XX_STREAM_BLOCK_READY_BUT_PDM_OVERFLOW,      
    PDMCC26XX_STREAM_ERROR,             
    PDMCC26XX_STREAM_STOPPING,          
    PDMCC26XX_STREAM_STOPPED,           
    PDMCC26XX_STREAM_FAILED_TO_STOP     
} PDMCC26XX_Status;

typedef enum {
    PDMCC26XX_PCM_SAMPLE_RATE_16K = 0,
    PDMCC26XX_PCM_SAMPLE_RATE_8K
} PDMCC26XX_PcmSampleRate;

typedef enum {
    PDMCC26XX_GAIN_24 = 1318,  
    PDMCC26XX_GAIN_18 = 660,  
    PDMCC26XX_GAIN_12 = 331,  
    PDMCC26XX_GAIN_6 = 166,   
    PDMCC26XX_GAIN_0 = 83,   
    PDMCC26XX_GAIN_END  
} PDMCC26XX_Gain;

typedef struct {
    void      *arg;             
    PDMCC26XX_Status status;    
} PDMCC26XX_StreamNotification;

typedef void (*PDMCC26XX_CallbackFxn) (PDMCC26XX_Handle handle, PDMCC26XX_StreamNotification *streamNotification);

typedef struct {
    PDMCC26XX_pcmBuffer      *buffer;           
    PDMCC26XX_Status status;                    
} PDMCC26XX_BufferRequest;

typedef struct {
    /* PDM control variables */
    bool                    micPowerActiveHigh;     
    bool                    applyCompression;       
    uint8_t                 pdmBufferQueueDepth;    
    uint16_t                retBufSizeInBytes;      
    const int32_t           *decimationFilter;      
    size_t                  decimationFilterStateSize; 
    PDMCC26XX_Gain          defaultFilterGain;      
    PDMCC26XX_PcmSampleRate pcmSampleRate;          
    uint32_t                startupDelayWithClockInSamples; 
    PDMCC26XX_CallbackFxn   callbackFxn;            
    PDMCC26XX_MallocFxn     mallocFxn;              
    PDMCC26XX_FreeFxn       freeFxn;                
    uintptr_t               custom;                 
} PDMCC26XX_Params;

typedef struct {
    /* PDM control variables */
    bool                            streamStarted;          
    bool                            micPowerActiveHigh;     
    bool                            applyCompression;       
    bool                            isOpen;                 
    uint16_t                        retBufSizeInBytes;      
    uint16_t                        pcmBufferSizeInBytes;   
    uint32_t                        startupDelayWithClockInSamples; 
    const int32_t                   *decimationFilter;      
    uint32_t                        *decimationFilterState; 
    size_t                          decimationFilterStateSize; 
    PDMCC26XX_StreamNotification    *streamNotification;    
    PDMCC26XX_CallbackFxn           callbackFxn;            
    PDMCC26XX_MallocFxn             mallocFxn;              
    PDMCC26XX_FreeFxn               freeFxn;                
    PDMCC26XX_Pdm2PcmFxn            pdm2pcmFxn;             
    PIN_State                       pinState;               
    PIN_Handle                      pinHandle;              
    HwiP_Struct hwi;                
} PDMCC26XX_Object;

extern void PDMCC26XX_init(PDMCC26XX_Handle handle);

extern PDMCC26XX_Handle  PDMCC26XX_open(PDMCC26XX_Params *params);

extern void PDMCC26XX_close(PDMCC26XX_Handle handle);

extern bool PDMCC26XX_startStream(PDMCC26XX_Handle handle);

extern bool PDMCC26XX_stopStream(PDMCC26XX_Handle handle);

extern bool PDMCC26XX_requestBuffer(PDMCC26XX_Handle handle, PDMCC26XX_BufferRequest *bufferRequest);

/*
 * ======== PDMCC26XX_Params_init ========
 * @brief   Function for initialising a PDMCC26XX_Params instance to its default value
 *
 * @param   params Pointer to a set of uninitialised params
 *
 */
extern void PDMCC26XX_Params_init(PDMCC26XX_Params *params);


#ifdef __cplusplus
}
#endif

#endif /* ti_drivers_pdm_PDMCC26XX__include */