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i2s_pdm.h
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i2s_pdm.h
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/*
* SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
/**
* This file is specified for I2S PDM communication mode
* Features:
* - Only support PDM tx/rx mode
* - Fixed to 2 slots
* - Data bit width only support 16 bits
*/
#pragma once
#include "hal/i2s_types.h"
#include "hal/gpio_types.h"
#include "driver/i2s_common.h"
#ifdef __cplusplus
extern "C" {
#endif
#if SOC_I2S_SUPPORTS_PDM_RX
/**
* @brief PDM format in 2 slots(RX)
* @param bits_per_sample i2s data bit width, only support 16 bits for PDM mode
* @param mono_or_stereo I2S_SLOT_MODE_MONO or I2S_SLOT_MODE_STEREO
*/
#define I2S_PDM_RX_SLOT_DEFAULT_CONFIG(bits_per_sample, mono_or_stereo) { \
.data_bit_width = bits_per_sample, \
.slot_bit_width = I2S_SLOT_BIT_WIDTH_AUTO, \
.slot_mode = mono_or_stereo, \
.slot_mask = (mono_or_stereo == I2S_SLOT_MODE_MONO) ? \
I2S_PDM_SLOT_LEFT : I2S_PDM_SLOT_BOTH, \
}
/**
* @brief i2s default pdm rx clock configuration
* @param rate sample rate
*/
#define I2S_PDM_RX_CLK_DEFAULT_CONFIG(rate) { \
.sample_rate_hz = rate, \
.clk_src = I2S_CLK_SRC_DEFAULT, \
.mclk_multiple = I2S_MCLK_MULTIPLE_256, \
.dn_sample_mode = I2S_PDM_DSR_8S \
}
/**
* @brief I2S slot configuration for pdm rx mode
*/
typedef struct {
/* General fields */
i2s_data_bit_width_t data_bit_width; /*!< I2S sample data bit width (valid data bits per sample), only support 16 bits for PDM mode */
i2s_slot_bit_width_t slot_bit_width; /*!< I2S slot bit width (total bits per slot) , only support 16 bits for PDM mode */
i2s_slot_mode_t slot_mode; /*!< Set mono or stereo mode with I2S_SLOT_MODE_MONO or I2S_SLOT_MODE_STEREO */
/* Particular fields */
i2s_pdm_slot_mask_t slot_mask; /*!< Choose the slots to activate */
} i2s_pdm_rx_slot_config_t;
/**
* @brief I2S clock configuration for pdm rx mode
*/
typedef struct {
/* General fields */
uint32_t sample_rate_hz; /*!< I2S sample rate */
i2s_clock_src_t clk_src; /*!< Choose clock source */
i2s_mclk_multiple_t mclk_multiple; /*!< The multiple of mclk to the sample rate */
/* Particular fields */
i2s_pdm_dsr_t dn_sample_mode; /*!< Down-sampling rate mode */
} i2s_pdm_rx_clk_config_t;
/**
* @brief I2S PDM tx mode GPIO pins configuration
*/
typedef struct {
gpio_num_t clk; /*!< PDM clk pin, output */
union {
gpio_num_t din; /*!< DATA pin 0, input */
gpio_num_t dins[SOC_I2S_PDM_MAX_RX_LINES]; /*!< DATA pins, input, only take effect when corresponding I2S_PDM_RX_LINEx_SLOT_xxx is enabled in i2s_pdm_rx_slot_config_t::slot_mask */
};
struct {
uint32_t clk_inv: 1; /*!< Set 1 to invert the clk output */
} invert_flags; /*!< GPIO pin invert flags */
} i2s_pdm_rx_gpio_config_t;
/**
* @brief I2S PDM RX mode major configuration that including clock/slot/gpio configuration
*/
typedef struct {
i2s_pdm_rx_clk_config_t clk_cfg; /*!< PDM RX clock configurations, can be generated by macro I2S_PDM_RX_CLK_DEFAULT_CONFIG */
i2s_pdm_rx_slot_config_t slot_cfg; /*!< PDM RX slot configurations, can be generated by macro I2S_PDM_RX_SLOT_DEFAULT_CONFIG */
i2s_pdm_rx_gpio_config_t gpio_cfg; /*!< PDM RX slot configurations, specified by user */
} i2s_pdm_rx_config_t;
/**
* @brief Initialize i2s channel to PDM RX mode
* @note Only allowed to be called when the channel state is REGISTERED, (i.e., channel has been allocated, but not initialized)
* and the state will be updated to READY if initialization success, otherwise the state will return to REGISTERED.
*
* @param[in] handle I2S rx channel handler
* @param[in] pdm_rx_cfg Configurations for PDM RX mode, including clock, slot and gpio
* The clock configuration can be generated by the helper macro `I2S_PDM_RX_CLK_DEFAULT_CONFIG`
* The slot configuration can be generated by the helper macro `I2S_PDM_RX_SLOT_DEFAULT_CONFIG`
*
* @return
* - ESP_OK Initialize successfully
* - ESP_ERR_NO_MEM No memory for storing the channel information
* - ESP_ERR_INVALID_ARG NULL pointer or invalid configuration
* - ESP_ERR_INVALID_STATE This channel is not registered
*/
esp_err_t i2s_channel_init_pdm_rx_mode(i2s_chan_handle_t handle, const i2s_pdm_rx_config_t *pdm_rx_cfg);
/**
* @brief Reconfigure the I2S clock for PDM RX mode
* @note Only allowed to be called when the channel state is READY, i.e., channel has been initialized, but not started
* this function won't change the state. 'i2s_channel_disable' should be called before calling this function if i2s has started.
* @note The input channel handle has to be initialized to PDM RX mode, i.e., 'i2s_channel_init_pdm_rx_mode' has been called before reconfiguring
*
* @param[in] handle I2S rx channel handler
* @param[in] clk_cfg PDM RX mode clock configuration, can be generated by `I2S_PDM_RX_CLK_DEFAULT_CONFIG`
* @return
* - ESP_OK Set clock successfully
* - ESP_ERR_INVALID_ARG NULL pointer, invalid configuration or not PDM mode
* - ESP_ERR_INVALID_STATE This channel is not initialized or not stopped
*/
esp_err_t i2s_channel_reconfig_pdm_rx_clock(i2s_chan_handle_t handle, const i2s_pdm_rx_clk_config_t *clk_cfg);
/**
* @brief Reconfigure the I2S slot for PDM RX mode
* @note Only allowed to be called when the channel state is READY, i.e., channel has been initialized, but not started
* this function won't change the state. 'i2s_channel_disable' should be called before calling this function if i2s has started.
* @note The input channel handle has to be initialized to PDM RX mode, i.e., 'i2s_channel_init_pdm_rx_mode' has been called before reconfiguring
*
* @param[in] handle I2S rx channel handler
* @param[in] slot_cfg PDM RX mode slot configuration, can be generated by `I2S_PDM_RX_SLOT_DEFAULT_CONFIG`
* @return
* - ESP_OK Set clock successfully
* - ESP_ERR_NO_MEM No memory for DMA buffer
* - ESP_ERR_INVALID_ARG NULL pointer, invalid configuration or not PDM mode
* - ESP_ERR_INVALID_STATE This channel is not initialized or not stopped
*/
esp_err_t i2s_channel_reconfig_pdm_rx_slot(i2s_chan_handle_t handle, const i2s_pdm_rx_slot_config_t *slot_cfg);
/**
* @brief Reconfigure the I2S gpio for PDM RX mode
* @note Only allowed to be called when the channel state is READY, i.e., channel has been initialized, but not started
* this function won't change the state. 'i2s_channel_disable' should be called before calling this function if i2s has started.
* @note The input channel handle has to be initialized to PDM RX mode, i.e., 'i2s_channel_init_pdm_rx_mode' has been called before reconfiguring
*
* @param[in] handle I2S rx channel handler
* @param[in] gpio_cfg PDM RX mode gpio configuration, specified by user
* @return
* - ESP_OK Set clock successfully
* - ESP_ERR_INVALID_ARG NULL pointer, invalid configuration or not PDM mode
* - ESP_ERR_INVALID_STATE This channel is not initialized or not stopped
*/
esp_err_t i2s_channel_reconfig_pdm_rx_gpio(i2s_chan_handle_t handle, const i2s_pdm_rx_gpio_config_t *gpio_cfg);
#endif // SOC_I2S_SUPPORTS_PDM_RX
#if SOC_I2S_SUPPORTS_PDM_TX
#if SOC_I2S_HW_VERSION_2
/**
* @brief PDM style in 2 slots(TX)
* @param bits_per_sample i2s data bit width, only support 16 bits for PDM mode
* @param mono_or_stereo I2S_SLOT_MODE_MONO or I2S_SLOT_MODE_STEREO
*/
#define I2S_PDM_TX_SLOT_DEFAULT_CONFIG(bits_per_sample, mono_or_stereo) { \
.data_bit_width = bits_per_sample, \
.slot_bit_width = I2S_SLOT_BIT_WIDTH_AUTO, \
.slot_mode = mono_or_stereo, \
.sd_prescale = 0, \
.sd_scale = I2S_PDM_SIG_SCALING_MUL_1, \
.hp_scale = I2S_PDM_SIG_SCALING_DIV_2, \
.lp_scale = I2S_PDM_SIG_SCALING_MUL_1, \
.sinc_scale = I2S_PDM_SIG_SCALING_MUL_1, \
.line_mode = I2S_PDM_TX_ONE_LINE_CODEC, \
.hp_en = true, \
.hp_cut_off_freq_hz = 35.5, \
.sd_dither = 0, \
.sd_dither2 = 1, \
}
#else // SOC_I2S_HW_VERSION_2
/**
* @brief PDM style in 2 slots(TX)
* @param bits_per_sample i2s data bit width, only support 16 bits for PDM mode
* @param mono_or_stereo I2S_SLOT_MODE_MONO or I2S_SLOT_MODE_STEREO
*/
#define I2S_PDM_TX_SLOT_DEFAULT_CONFIG(bits_per_sample, mono_or_stereo) { \
.data_bit_width = bits_per_sample, \
.slot_bit_width = I2S_SLOT_BIT_WIDTH_AUTO, \
.slot_mode = mono_or_stereo, \
.slot_mask = I2S_PDM_SLOT_BOTH, \
.sd_prescale = 0, \
.sd_scale = I2S_PDM_SIG_SCALING_MUL_1, \
.hp_scale = I2S_PDM_SIG_SCALING_MUL_1, \
.lp_scale = I2S_PDM_SIG_SCALING_MUL_1, \
.sinc_scale = I2S_PDM_SIG_SCALING_MUL_1, \
}
#endif // SOC_I2S_HW_VERSION_2
/**
* @brief i2s default pdm tx clock configuration
* @note TX PDM can only be set to the following two up-sampling rate configurations:
* 1: fp = 960, fs = sample_rate_hz / 100, in this case, Fpdm = 128*48000
* 2: fp = 960, fs = 480, in this case, Fpdm = 128*Fpcm = 128*sample_rate_hz
* If the pdm receiver do not care the pdm serial clock, it's recommended set Fpdm = 128*48000.
* Otherwise, the second configuration should be adopted.
* @param rate sample rate (not suggest to exceed 48000 Hz, otherwise more glitches and noise may appear)
*/
#define I2S_PDM_TX_CLK_DEFAULT_CONFIG(rate) { \
.sample_rate_hz = rate, \
.clk_src = I2S_CLK_SRC_DEFAULT, \
.mclk_multiple = I2S_MCLK_MULTIPLE_256, \
.up_sample_fp = 960, \
.up_sample_fs = 480, \
}
/*
High Pass Filter Cut-off Frequency Sheet
+----------------+------------------+----------------+------------------+----------------+------------------+
| param0, param5 | cut-off freq(Hz) | param0, param5 | cut-off freq(Hz) | param0, param5 | cut-off freq(Hz) |
+----------------+------------------+----------------+------------------+----------------+------------------+
| (0, 0) | 185 | (3, 3) | 115 | (5, 5) | 69 |
| (0, 1) | 172 | (1, 7) | 106 | (4, 7) | 63 |
| (1, 1) | 160 | (2, 4) | 104 | (5, 6) | 58 |
| (1, 2) | 150 | (4, 4) | 92 | (5, 7) | 49 |
| (2, 2) | 137 | (2, 7) | 91.5 | (6, 6) | 46 |
| (2, 3) | 126 | (4, 5) | 81 | (6, 7) | 35.5 |
| (0, 3) | 120 | (3, 7) | 77.2 | (7, 7) | 23.3 |
+----------------+------------------+----------------+------------------+----------------+------------------+
*/
/**
* @brief I2S slot configuration for pdm tx mode
*/
typedef struct {
/* General fields */
i2s_data_bit_width_t data_bit_width; /*!< I2S sample data bit width (valid data bits per sample), only support 16 bits for PDM mode */
i2s_slot_bit_width_t slot_bit_width; /*!< I2S slot bit width (total bits per slot), only support 16 bits for PDM mode */
i2s_slot_mode_t slot_mode; /*!< Set mono or stereo mode with I2S_SLOT_MODE_MONO or I2S_SLOT_MODE_STEREO
* For PDM TX mode, mono means the data buffer only contains one slot data,
* Stereo means the data buffer contains two slots data
*/
/* Particular fields */
#if SOC_I2S_HW_VERSION_1
i2s_pdm_slot_mask_t slot_mask; /*!< Slot mask to choose left or right slot */
#endif
uint32_t sd_prescale; /*!< Sigma-delta filter prescale */
i2s_pdm_sig_scale_t sd_scale; /*!< Sigma-delta filter scaling value */
i2s_pdm_sig_scale_t hp_scale; /*!< High pass filter scaling value */
i2s_pdm_sig_scale_t lp_scale; /*!< Low pass filter scaling value */
i2s_pdm_sig_scale_t sinc_scale; /*!< Sinc filter scaling value */
#if SOC_I2S_HW_VERSION_2
i2s_pdm_tx_line_mode_t line_mode; /*!< PDM TX line mode, one-line codec, one-line dac, two-line dac mode can be selected */
bool hp_en; /*!< High pass filter enable */
float hp_cut_off_freq_hz; /*!< High pass filter cut-off frequency, range 23.3Hz ~ 185Hz, see cut-off frequency sheet above */
uint32_t sd_dither; /*!< Sigma-delta filter dither */
uint32_t sd_dither2; /*!< Sigma-delta filter dither2 */
#endif // SOC_I2S_HW_VERSION_2
} i2s_pdm_tx_slot_config_t;
/**
* @brief I2S clock configuration for pdm tx mode
*/
typedef struct {
/* General fields */
uint32_t sample_rate_hz; /*!< I2S sample rate, not suggest to exceed 48000 Hz, otherwise more glitches and noise may appear */
i2s_clock_src_t clk_src; /*!< Choose clock source */
i2s_mclk_multiple_t mclk_multiple; /*!< The multiple of mclk to the sample rate */
/* Particular fields */
uint32_t up_sample_fp; /*!< Up-sampling param fp */
uint32_t up_sample_fs; /*!< Up-sampling param fs, not allowed to be greater than 480 */
} i2s_pdm_tx_clk_config_t;
/**
* @brief I2S PDM tx mode GPIO pins configuration
*/
typedef struct {
gpio_num_t clk; /*!< PDM clk pin, output */
gpio_num_t dout; /*!< DATA pin, output */
#if SOC_I2S_PDM_MAX_TX_LINES > 1
gpio_num_t dout2; /*!< The second data pin for the DAC dual-line mode,
* only take effect when the line mode is `I2S_PDM_TX_TWO_LINE_DAC`
*/
#endif
struct {
uint32_t clk_inv: 1; /*!< Set 1 to invert the clk output */
} invert_flags; /*!< GPIO pin invert flags */
} i2s_pdm_tx_gpio_config_t;
/**
* @brief I2S PDM TX mode major configuration that including clock/slot/gpio configuration
*/
typedef struct {
i2s_pdm_tx_clk_config_t clk_cfg; /*!< PDM TX clock configurations, can be generated by macro I2S_PDM_TX_CLK_DEFAULT_CONFIG */
i2s_pdm_tx_slot_config_t slot_cfg; /*!< PDM TX slot configurations, can be generated by macro I2S_PDM_TX_SLOT_DEFAULT_CONFIG */
i2s_pdm_tx_gpio_config_t gpio_cfg; /*!< PDM TX gpio configurations, specified by user */
} i2s_pdm_tx_config_t;
/**
* @brief Initialize i2s channel to PDM TX mode
* @note Only allowed to be called when the channel state is REGISTERED, (i.e., channel has been allocated, but not initialized)
* and the state will be updated to READY if initialization success, otherwise the state will return to REGISTERED.
*
* @param[in] handle I2S tx channel handler
* @param[in] pdm_tx_cfg Configurations for PDM TX mode, including clock, slot and gpio
* The clock configuration can be generated by the helper macro `I2S_PDM_TX_CLK_DEFAULT_CONFIG`
* The slot configuration can be generated by the helper macro `I2S_PDM_TX_SLOT_DEFAULT_CONFIG`
*
* @return
* - ESP_OK Initialize successfully
* - ESP_ERR_NO_MEM No memory for storing the channel information
* - ESP_ERR_INVALID_ARG NULL pointer or invalid configuration
* - ESP_ERR_INVALID_STATE This channel is not registered
*/
esp_err_t i2s_channel_init_pdm_tx_mode(i2s_chan_handle_t handle, const i2s_pdm_tx_config_t *pdm_tx_cfg);
/**
* @brief Reconfigure the I2S clock for PDM TX mode
* @note Only allowed to be called when the channel state is READY, i.e., channel has been initialized, but not started
* this function won't change the state. 'i2s_channel_disable' should be called before calling this function if i2s has started.
* @note The input channel handle has to be initialized to PDM TX mode, i.e., 'i2s_channel_init_pdm_tx_mode' has been called before reconfiguring
*
* @param[in] handle I2S tx channel handler
* @param[in] clk_cfg PDM TX mode clock configuration, can be generated by `I2S_PDM_TX_CLK_DEFAULT_CONFIG`
* @return
* - ESP_OK Set clock successfully
* - ESP_ERR_INVALID_ARG NULL pointer, invalid configuration or not PDM mode
* - ESP_ERR_INVALID_STATE This channel is not initialized or not stopped
*/
esp_err_t i2s_channel_reconfig_pdm_tx_clock(i2s_chan_handle_t handle, const i2s_pdm_tx_clk_config_t *clk_cfg);
/**
* @brief Reconfigure the I2S slot for PDM TX mode
* @note Only allowed to be called when the channel state is READY, i.e., channel has been initialized, but not started
* this function won't change the state. 'i2s_channel_disable' should be called before calling this function if i2s has started.
* @note The input channel handle has to be initialized to PDM TX mode, i.e., 'i2s_channel_init_pdm_tx_mode' has been called before reconfiguring
*
* @param[in] handle I2S tx channel handler
* @param[in] slot_cfg PDM TX mode slot configuration, can be generated by `I2S_PDM_TX_SLOT_DEFAULT_CONFIG`
* @return
* - ESP_OK Set clock successfully
* - ESP_ERR_NO_MEM No memory for DMA buffer
* - ESP_ERR_INVALID_ARG NULL pointer, invalid configuration or not PDM mode
* - ESP_ERR_INVALID_STATE This channel is not initialized or not stopped
*/
esp_err_t i2s_channel_reconfig_pdm_tx_slot(i2s_chan_handle_t handle, const i2s_pdm_tx_slot_config_t *slot_cfg);
/**
* @brief Reconfigure the I2S gpio for PDM TX mode
* @note Only allowed to be called when the channel state is READY, i.e., channel has been initialized, but not started
* this function won't change the state. 'i2s_channel_disable' should be called before calling this function if i2s has started.
* @note The input channel handle has to be initialized to PDM TX mode, i.e., 'i2s_channel_init_pdm_tx_mode' has been called before reconfiguring
*
* @param[in] handle I2S tx channel handler
* @param[in] gpio_cfg PDM TX mode gpio configuration, specified by user
* @return
* - ESP_OK Set clock successfully
* - ESP_ERR_INVALID_ARG NULL pointer, invalid configuration or not PDM mode
* - ESP_ERR_INVALID_STATE This channel is not initialized or not stopped
*/
esp_err_t i2s_channel_reconfig_pdm_tx_gpio(i2s_chan_handle_t handle, const i2s_pdm_tx_gpio_config_t *gpio_cfg);
#endif // SOC_I2S_SUPPORTS_PDM_TX
#ifdef __cplusplus
}
#endif