Struct i2s_pdm_tx_slot_config_t 

#[repr(C)]
pub struct i2s_pdm_tx_slot_config_t {

    pub data_bit_width: i2s_data_bit_width_t,
    pub slot_bit_width: i2s_slot_bit_width_t,
    pub slot_mode: i2s_slot_mode_t,
    pub data_fmt: i2s_pdm_data_fmt_t,
    pub sd_prescale: u32,
    pub sd_scale: i2s_pdm_sig_scale_t,
    pub hp_scale: i2s_pdm_sig_scale_t,
    pub lp_scale: i2s_pdm_sig_scale_t,
    pub sinc_scale: i2s_pdm_sig_scale_t,
    pub line_mode: i2s_pdm_tx_line_mode_t,
    pub hp_en: bool,
    pub hp_cut_off_freq_hz: f32,
    pub sd_dither: u32,
    pub sd_dither2: u32,
}

@brief I2S slot configuration for PDM TX mode

Fields

data_bit_width: i2s_data_bit_width_t

< I2S sample data bit width (valid data bits per sample), only support 16 bits for PDM mode

slot_bit_width: i2s_slot_bit_width_t

< I2S slot bit width (total bits per slot), only support 16 bits for PDM mode

slot_mode: i2s_slot_mode_t

< 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

data_fmt: i2s_pdm_data_fmt_t

< The data format of PDM TX mode. It determines what kind of data format is written in software. Typically, set this field to I2S_PDM_DATA_FMT_PCM when PCM2PDM filter is supported in the hardware, so that you can write PCM format data in software, and then the hardware PCM2PDM filter will help to convert it into PDM format on the line. Otherwise if this field is set to I2S_PDM_DATA_FMT_RAW, The data written in software are supposed to be the raw PDM format.

sd_prescale: u32

< Sigma-delta filter prescale

sd_scale: i2s_pdm_sig_scale_t

< Sigma-delta filter scaling value

hp_scale: i2s_pdm_sig_scale_t

< High pass filter scaling value

lp_scale: i2s_pdm_sig_scale_t

< Low pass filter scaling value

sinc_scale: i2s_pdm_sig_scale_t

< Sinc filter scaling value

line_mode: i2s_pdm_tx_line_mode_t

< PDM TX line mode, one-line codec, one-line dac, two-line dac mode can be selected

hp_en: bool

< High pass filter enable

hp_cut_off_freq_hz: f32

< High pass filter cut-off frequency, range 23.3Hz ~ 185Hz, see cut-off frequency sheet above

sd_dither: u32

< Sigma-delta filter dither

sd_dither2: u32

< Sigma-delta filter dither2

Trait Implementations

impl Clone for i2s_pdm_tx_slot_config_t

fn clone(&self) -> i2s_pdm_tx_slot_config_t

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for i2s_pdm_tx_slot_config_t

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for i2s_pdm_tx_slot_config_t

fn default() -> Self

Returns the “default value” for a type.

impl Copy for i2s_pdm_tx_slot_config_t