i2s.h

/*
 * SPDX-FileCopyrightText: 2015-2021 Espressif Systems (Shanghai) CO LTD
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#pragma once

#include "esp_types.h"
#include "esp_err.h"
#include "freertos/FreeRTOS.h"
#include "freertos/semphr.h"
#include "soc/i2s_periph.h"
#include "soc/rtc_periph.h"
#include "soc/soc_caps.h"
#include "hal/i2s_types.h"
#include "driver/periph_ctrl.h"
#include "esp_intr_alloc.h"

#if SOC_I2S_SUPPORTS_ADC
#include "driver/adc.h"
#endif

#ifdef __cplusplus
extern "C" {
#endif

#define I2S_PIN_NO_CHANGE (-1) /*!< Use in i2s_pin_config_t for pins which should not be changed */

/**
 * @brief I2S port number, the max port number is (I2S_NUM_MAX -1).
 */
typedef enum {
    I2S_NUM_0 = 0,                 /*!< I2S port 0 */
#if SOC_I2S_NUM > 1
    I2S_NUM_1 = 1,                 /*!< I2S port 1 */
#endif
    I2S_NUM_MAX,                   /*!< I2S port max */
} i2s_port_t;

#if SOC_I2S_SUPPORTS_PCM
/**
 * @brief I2S PCM configuration
 *
 */
typedef struct {
    i2s_pcm_compress_t  pcm_type;       /*!< I2S PCM a/u-law decompress or compress type */
} i2s_pcm_cfg_t;
#endif

#if SOC_I2S_SUPPORTS_PDM_TX
/**
 * @brief Default I2S PDM Up-Sampling Rate configuration
 */
#define I2S_PDM_DEFAULT_UPSAMPLE_CONFIG(rate) { \
        .sample_rate = rate,                    \
        .fp = 960,                              \
        .fs = (rate) / 100,                     \
    }

/**
 * @brief I2S PDM up-sample rate configuration
 * @note  TX PDM can only be set to the following two upsampling rate configurations:
 *        1: fp = 960, fs = sample_rate / 100, in this case, Fpdm = 128*48000
 *        2: fp = 960, fs = 480, in this case, Fpdm = 128*Fpcm = 128*sample_rate
 *        If the pdm receiver do not care the pdm serial clock, it's recommended set Fpdm = 128*48000.
 *        Otherwise, the second configuration should be applied.
 */
typedef struct  {
    int sample_rate;                    /*!< I2S PDM sample rate */
    int fp;                             /*!< I2S PDM TX upsampling paramater. Normally it should be set to 960 */
    int fs;                             /*!< I2S PDM TX upsampling paramater. When it is set to 480, the pdm clock frequency Fpdm = 128 * sample_rate, when it is set to sample_rate / 100， Fpdm will be fixed to 128*48000 */
} i2s_pdm_tx_upsample_cfg_t;
#endif

/**
 * @brief I2S pin number for i2s_set_pin
 *
 */
typedef struct {
    int mck_io_num;     /*!< MCK in out pin. Note that ESP32 supports setting MCK on GPIO0/GPIO1/GPIO3 only*/
    int bck_io_num;     /*!< BCK in out pin*/
    int ws_io_num;      /*!< WS in out pin*/
    int data_out_num;   /*!< DATA out pin*/
    int data_in_num;    /*!< DATA in pin*/
} i2s_pin_config_t;

/**
 * @brief I2S driver configuration parameters
 *
 */
typedef struct {

    i2s_mode_t              mode;                       /*!< I2S work mode */
    uint32_t                sample_rate;                /*!< I2S sample rate */
    i2s_bits_per_sample_t   bits_per_sample;            /*!< I2S sample bits in one channel */
    i2s_channel_fmt_t       channel_format;             /*!< I2S channel format.*/
    i2s_comm_format_t       communication_format;       /*!< I2S communication format */
    int                     intr_alloc_flags;           /*!< Flags used to allocate the interrupt. One or multiple (ORred) ESP_INTR_FLAG_* values. See esp_intr_alloc.h for more info */
    int                     dma_buf_count;              /**< The total number of DMA buffers to receive/transmit data.
                                                          * A descriptor includes some information such as buffer address,
                                                          * the address of the next descriptor, and the buffer length.
                                                          * Since one descriptor points to one buffer, therefore, 'dma_desc_num' can be interpreted as the total number of DMA buffers used to store data from DMA interrupt.
                                                          * Notice that these buffers are internal to'i2s_read' and descriptors are created automatically inside of the I2S driver.
                                                          * Users only need to set the buffer number while the length is derived from the parameter described below.
                                                          */
    int                     dma_buf_len;                /**< Number of frames in a DMA buffer.
                                                          *  A frame means the data of all channels in a WS cycle.
                                                          *  The real_dma_buf_size = dma_buf_len * chan_num * bits_per_chan / 8.
                                                          *  For example, if two channels in stereo mode (i.e., 'channel_format' is set to 'I2S_CHANNEL_FMT_RIGHT_LEFT') are active,
                                                          *  and each channel transfers 32 bits (i.e., 'bits_per_sample' is set to 'I2S_BITS_PER_CHAN_32BIT'),
                                                          *  then the total number of bytes of a frame is 'channel_format' * 'bits_per_sample' = 2 * 32 / 8 = 8 bytes.
                                                          *  We assume that the current 'dma_buf_len' is 100, then the real length of the DMA buffer is 8 * 100 = 800 bytes.
                                                          *  Note that the length of an internal real DMA buffer shouldn't be greater than 4092.
                                                          */

    bool                    use_apll;                   /*!< I2S using APLL as main I2S clock, enable it to get accurate clock */
    bool                    tx_desc_auto_clear;         /*!< I2S auto clear tx descriptor if there is underflow condition (helps in avoiding noise in case of data unavailability) */
    int                     fixed_mclk;                 /*!< I2S using fixed MCLK output. If use_apll = true and fixed_mclk > 0, then the clock output for i2s is fixed and equal to the fixed_mclk value. If fixed_mclk set, mclk_multiple won't take effect */
    i2s_mclk_multiple_t     mclk_multiple;              /*!< The multiple of I2S master clock(MCLK) to sample rate */
    i2s_bits_per_chan_t     bits_per_chan;              /*!< I2S total bits in one channel， only take effect when larger than 'bits_per_sample', default '0' means equal to 'bits_per_sample' */

#if SOC_I2S_SUPPORTS_TDM
    i2s_channel_t           chan_mask;                  /*!< I2S active channel bit mask, set value in `i2s_channel_t` to enable specific channel, the bit map of active channel can not exceed (0x1<<total_chan). */
    uint32_t                total_chan;                 /*!< I2S Total number of channels. If it is smaller than the biggest active channel number, it will be set to this number automatically. */
    bool                    left_align;                 /*!< Set to enable left alignment */
    bool                    big_edin;                   /*!< Set to enable big edin */
    bool                    bit_order_msb;              /*!< Set to enable msb order */
    bool                    skip_msk;                   /*!< Set to enable skip mask. If it is enabled, only the data of the enabled channels will be sent, otherwise all data stored in DMA TX buffer will be sent */
#endif // SOC_I2S_SUPPORTS_TDM

} i2s_driver_config_t;

typedef i2s_driver_config_t i2s_config_t;       // for backward compatible
typedef intr_handle_t i2s_isr_handle_t;         // for backward compatible

/**
 * @brief I2S event queue types
 *
 */
typedef enum {
    I2S_EVENT_DMA_ERROR,
    I2S_EVENT_TX_DONE,     /*!< I2S DMA finish sent 1 buffer*/
    I2S_EVENT_RX_DONE,     /*!< I2S DMA finish received 1 buffer*/
    I2S_EVENT_TX_Q_OVF,    /*!< I2S DMA sent queue overflow*/
    I2S_EVENT_RX_Q_OVF,    /*!< I2S DMA receive queue overflow*/
    I2S_EVENT_MAX,         /*!< I2S event max index*/
} i2s_event_type_t;

/**
 * @brief Event structure used in I2S event queue
 *
 */
typedef struct {
    i2s_event_type_t    type;   /*!< I2S event type */
    size_t              size;   /*!< I2S data size for I2S_DATA event*/
} i2s_event_t;

/**
 * @brief Set I2S pin number
 *
 * @note
 * The I2S peripheral output signals can be connected to multiple GPIO pads.
 * However, the I2S peripheral input signal can only be connected to one GPIO pad.
 *
 * @param   i2s_num     I2S port number
 *
 * @param   pin         I2S Pin structure, or NULL to set 2-channel 8-bit internal DAC pin configuration (GPIO25 & GPIO26)
 *
 * Inside the pin configuration structure, set I2S_PIN_NO_CHANGE for any pin where
 * the current configuration should not be changed.
 *
 * @note if *pin is set as NULL, this function will initialize both of the built-in DAC channels by default.
 *       if you don't want this to happen and you want to initialize only one of the DAC channels, you can call i2s_set_dac_mode instead.
 *
 * @return
 *     - ESP_OK              Success
 *     - ESP_ERR_INVALID_ARG Parameter error
 *     - ESP_FAIL            IO error
 */
esp_err_t i2s_set_pin(i2s_port_t i2s_num, const i2s_pin_config_t *pin);

#if SOC_I2S_SUPPORTS_PDM_RX
/**
 * @brief Set PDM mode down-sample rate
 *        In PDM RX mode, there would be 2 rounds of downsample process in hardware.
 *        In the first downsample process, the sampling number can be 16 or 8.
 *        In the second downsample process, the sampling number is fixed as 8.
 *        So the clock frequency in PDM RX mode would be (fpcm * 64) or (fpcm * 128) accordingly.
 * @param i2s_num I2S port number
 * @param downsample i2s RX down sample rate for PDM mode.
 *
 * @note After calling this function, it would call i2s_set_clk inside to update the clock frequency.
 *       Please call this function after I2S driver has been initialized.
 *
 * @return
 *     - ESP_OK Success
 *     - ESP_ERR_INVALID_ARG Parameter error
 *     - ESP_ERR_NO_MEM      Out of memory
 */
esp_err_t i2s_set_pdm_rx_down_sample(i2s_port_t i2s_num, i2s_pdm_dsr_t downsample);
#endif

#if SOC_I2S_SUPPORTS_PDM_TX
/**
 * @brief Set TX PDM mode up-sample rate
 * @note  If you have set PDM mode while calling 'i2s_driver_install',
 *        default PDM TX upsample parameters have already been set,
 *        no need to call this function again if you don't have to change the default configuration
 *
 * @param i2s_num I2S port number
 * @param upsample_cfg Set I2S PDM up-sample rate configuration
 *
 * @return
 *     - ESP_OK              Success
 *     - ESP_ERR_INVALID_ARG Parameter error
 *     - ESP_ERR_NO_MEM      Out of memory
 */
esp_err_t i2s_set_pdm_tx_up_sample(i2s_port_t i2s_num, const i2s_pdm_tx_upsample_cfg_t *upsample_cfg);
#endif

/**
 * @brief Install and start I2S driver.
 *
 * @param i2s_num         I2S port number
 *
 * @param i2s_config      I2S configurations - see i2s_config_t struct
 *
 * @param queue_size      I2S event queue size/depth.
 *
 * @param i2s_queue       I2S event queue handle, if set NULL, driver will not use an event queue.
 *
 * This function must be called before any I2S driver read/write operations.
 *
 * @return
 *     - ESP_OK              Success
 *     - ESP_ERR_INVALID_ARG Parameter error
 *     - ESP_ERR_NO_MEM      Out of memory
 *     - ESP_ERR_INVALID_STATE  Current I2S port is in use
 */
esp_err_t i2s_driver_install(i2s_port_t i2s_num, const i2s_config_t *i2s_config, int queue_size, void *i2s_queue);

/**
 * @brief Uninstall I2S driver.
 *
 * @param i2s_num  I2S port number
 *
 * @return
 *     - ESP_OK              Success
 *     - ESP_ERR_INVALID_ARG Parameter error
 *     - ESP_ERR_INVALID_STATE I2S port has been uninstalled by others (e.g. LCD i80)
 */
esp_err_t i2s_driver_uninstall(i2s_port_t i2s_num);

/**
 * @brief Write data to I2S DMA transmit buffer.
 *
 * @param i2s_num             I2S port number
 *
 * @param src                 Source address to write from
 *
 * @param size                Size of data in bytes
 *
 * @param[out] bytes_written  Number of bytes written, if timeout, the result will be less than the size passed in.
 *
 * @param ticks_to_wait       TX buffer wait timeout in RTOS ticks. If this
 * many ticks pass without space becoming available in the DMA
 * transmit buffer, then the function will return (note that if the
 * data is written to the DMA buffer in pieces, the overall operation
 * may still take longer than this timeout.) Pass portMAX_DELAY for no
 * timeout.
 *
 * @return
 *     - ESP_OK               Success
 *     - ESP_ERR_INVALID_ARG  Parameter error
 */
esp_err_t i2s_write(i2s_port_t i2s_num, const void *src, size_t size, size_t *bytes_written, TickType_t ticks_to_wait);

/**
 * @brief Write data to I2S DMA transmit buffer while expanding the number of bits per sample. For example, expanding 16-bit PCM to 32-bit PCM.
 *
 * @param i2s_num             I2S port number
 *
 * @param src                 Source address to write from
 *
 * @param size                Size of data in bytes
 *
 * @param src_bits            Source audio bit
 *
 * @param aim_bits            Bit wanted, no more than 32, and must be greater than src_bits
 *
 * @param[out] bytes_written  Number of bytes written, if timeout, the result will be less than the size passed in.
 *
 * @param ticks_to_wait       TX buffer wait timeout in RTOS ticks. If this
 * many ticks pass without space becoming available in the DMA
 * transmit buffer, then the function will return (note that if the
 * data is written to the DMA buffer in pieces, the overall operation
 * may still take longer than this timeout.) Pass portMAX_DELAY for no
 * timeout.
 *
 * Format of the data in source buffer is determined by the I2S
 * configuration (see i2s_config_t).
 *
 * @return
 *     - ESP_OK              Success
 *     - ESP_ERR_INVALID_ARG Parameter error
 */
esp_err_t i2s_write_expand(i2s_port_t i2s_num, const void *src, size_t size, size_t src_bits, size_t aim_bits, size_t *bytes_written, TickType_t ticks_to_wait);

/**
 * @brief Read data from I2S DMA receive buffer
 *
 * @param i2s_num         I2S port number
 *
 * @param dest            Destination address to read into
 *
 * @param size            Size of data in bytes
 *
 * @param[out] bytes_read Number of bytes read, if timeout, bytes read will be less than the size passed in.
 *
 * @param ticks_to_wait   RX buffer wait timeout in RTOS ticks. If this many ticks pass without bytes becoming available in the DMA receive buffer, then the function will return (note that if data is read from the DMA buffer in pieces, the overall operation may still take longer than this timeout.) Pass portMAX_DELAY for no timeout.
 *
 * @note If the built-in ADC mode is enabled, we should call i2s_adc_enable and i2s_adc_disable around the whole reading process,
 *       to prevent the data getting corrupted.
 *
 * @return
 *     - ESP_OK               Success
 *     - ESP_ERR_INVALID_ARG  Parameter error
 */
esp_err_t i2s_read(i2s_port_t i2s_num, void *dest, size_t size, size_t *bytes_read, TickType_t ticks_to_wait);

/**
 * @brief Set sample rate used for I2S RX and TX.
 *
 * The bit clock rate is determined by the sample rate and i2s_config_t configuration parameters (number of channels, bits_per_sample).
 *
 * `bit_clock = rate * (number of channels) * bits_per_sample`
 *
 * @param i2s_num  I2S port number
 *
 * @param rate I2S sample rate (ex: 8000, 44100...)
 *
 * @return
 *     - ESP_OK              Success
 *     - ESP_ERR_INVALID_ARG Parameter error
 *     - ESP_ERR_NO_MEM      Out of memory
 */
esp_err_t i2s_set_sample_rates(i2s_port_t i2s_num, uint32_t rate);

/**
 * @brief Stop I2S driver
 *
 * There is no need to call i2s_stop() before calling i2s_driver_uninstall().
 *
 * Disables I2S TX/RX, until i2s_start() is called.
 *
 * @param i2s_num  I2S port number
 *
 * @return
 *     - ESP_OK              Success
 *     - ESP_ERR_INVALID_ARG Parameter error
 */
esp_err_t i2s_stop(i2s_port_t i2s_num);

/**
 * @brief Start I2S driver
 *
 * It is not necessary to call this function after i2s_driver_install() (it is started automatically), however it is necessary to call it after i2s_stop().
 *
 *
 * @param i2s_num  I2S port number
 *
 * @return
 *     - ESP_OK              Success
 *     - ESP_ERR_INVALID_ARG Parameter error
 */
esp_err_t i2s_start(i2s_port_t i2s_num);

/**
 * @brief Zero the contents of the TX DMA buffer.
 *
 * Pushes zero-byte samples into the TX DMA buffer, until it is full.
 *
 * @param i2s_num  I2S port number
 *
 * @return
 *     - ESP_OK              Success
 *     - ESP_ERR_INVALID_ARG Parameter error
 */
esp_err_t i2s_zero_dma_buffer(i2s_port_t i2s_num);

#if SOC_I2S_SUPPORTS_PCM
/**
 * @brief Configure I2S a/u-law decompress or compress
 *
 * @note  This function should be called after i2s driver installed
 *        Only take effecttive when the i2s 'communication_format' is set to 'I2S_COMM_FORMAT_STAND_PCM_SHORT' or 'I2S_COMM_FORMAT_STAND_PCM_LONG'
 *
 * @param i2s_num  I2S port number
 *
 * @param pcm_cfg  including mode selection and a/u-law decompress or compress configuration paramater
 *
 * @return
 *     - ESP_OK              Success
 *     - ESP_ERR_INVALID_ARG Parameter error
 */
esp_err_t i2s_pcm_config(i2s_port_t i2s_num, const i2s_pcm_cfg_t *pcm_cfg);
#endif

/**
 * @brief Set clock & bit width used for I2S RX and TX.
 *
 * Similar to i2s_set_sample_rates(), but also sets bit width.
 *
 * 1. stop i2s;
 * 2. calculate mclk, bck, bck_factor
 * 3. malloc dma buffer;
 * 4. start i2s
 *
 * @param i2s_num  I2S port number
 *
 * @param rate I2S sample rate (ex: 8000, 44100...)
 *
 * @param bits_cfg I2S bits configuration
 *             the low 16 bits is for data bits per sample in one channel (see 'i2s_bits_per_sample_t')
 *             the high 16 bits is for total bits in one channel (see 'i2s_bits_per_chan_t')
 *             high 16bits =0 means same as the bits per sample.
 *
 * @param ch I2S channel, (I2S_CHANNEL_MONO, I2S_CHANNEL_STEREO or specific channel in TDM mode)
 *
 * @return
 *     - ESP_OK              Success
 *     - ESP_ERR_INVALID_ARG Parameter error
 *     - ESP_ERR_NO_MEM      Out of memory
 */
esp_err_t i2s_set_clk(i2s_port_t i2s_num, uint32_t rate, uint32_t bits_cfg, i2s_channel_t ch);

/**
 * @brief get clock set on particular port number.
 *
 * @param i2s_num  I2S port number
 *
 * @return
 *     - actual clock set by i2s driver
 */
float i2s_get_clk(i2s_port_t i2s_num);

#if SOC_I2S_SUPPORTS_ADC
/**
 * @brief Set built-in ADC mode for I2S DMA, this function will initialize ADC pad,
 *        and set ADC parameters.
 * @note  In this mode, the ADC maximum sampling rate is 150KHz. Set the sampling rate through ``i2s_config_t``.
 * @param adc_unit    SAR ADC unit index
 * @param adc_channel ADC channel index
 * @return
 *     - ESP_OK              Success
 *     - ESP_ERR_INVALID_ARG Parameter error
 */
esp_err_t i2s_set_adc_mode(adc_unit_t adc_unit, adc1_channel_t adc_channel);

/**
 * @brief Start to use I2S built-in ADC mode
 * @note This function would acquire the lock of ADC to prevent the data getting corrupted
 *       during the I2S peripheral is being used to do fully continuous ADC sampling.
 *
 * @param i2s_num i2s port index
 * @return
 *     - ESP_OK                Success
 *     - ESP_ERR_INVALID_ARG   Parameter error
 *     - ESP_ERR_INVALID_STATE Driver state error
 */
esp_err_t i2s_adc_enable(i2s_port_t i2s_num);

/**
 * @brief Stop to use I2S built-in ADC mode
 * @param i2s_num i2s port index
 * @note This function would release the lock of ADC so that other tasks can use ADC.
 * @return
 *     - ESP_OK                 Success
 *     - ESP_ERR_INVALID_ARG    Parameter error
 *     - ESP_ERR_INVALID_STATE  Driver state error
 */
esp_err_t i2s_adc_disable(i2s_port_t i2s_num);
#endif // SOC_I2S_SUPPORTS_ADC

#if SOC_I2S_SUPPORTS_DAC
/**
 * @brief Set I2S dac mode, I2S built-in DAC is disabled by default
 *
 * @param dac_mode DAC mode configurations - see i2s_dac_mode_t
 *
 * @note Built-in DAC functions are only supported on I2S0 for current ESP32 chip.
 *       If either of the built-in DAC channel are enabled, the other one can not
 *       be used as RTC DAC function at the same time.
 *
 * @return
 *     - ESP_OK               Success
 *     - ESP_ERR_INVALID_ARG  Parameter error
 */
esp_err_t i2s_set_dac_mode(i2s_dac_mode_t dac_mode);
#endif //SOC_I2S_SUPPORTS_DAC


#ifdef __cplusplus
}
#endif