Struct esp_idf_hal::i2s::config::PdmTxSlotConfig

pub struct PdmTxSlotConfig { /* private fields */ }

PDM mode channel transmit slot configuration.

Note

The slot_mode and line_mode (microcontrollers new than ESP32) or slot_mask (ESP32) cause data to be interpreted in different ways, as noted below.

Assuming the buffered data contains the following samples (where a sample may be 1, 2, 3, or 4 bytes, depending on data_bit_width):

d[0]	d[1]	d[2]	d[3]	d[4]	d[5]	d[6]	d[7]
11	12	13	14	15	16	17	18

The actual data on the line will be:

All microcontrollers except ESP32

line_mode	slot_mode	Line	Transmitted Data
			WS Low	WS High	WS Low	WS High	WS Low	WS High	WS Low	WS High
OneLineCodec	Mono	dout	11	0	12	0	13	0	14	0
	Stereo	dout	11	12	13	14	15	16	17	18
OneLineDac	Mono	dout	11	11	12	12	13	13	14	14
TwoLineDac	Mono	dout	12	12	14	14	16	16	18	18
		dout2	0	0	0	0	0	0	0	0
	Stereo	dout	12	12	14	14	16	16	18	18
		dout2	11	11	13	13	15	15	17	17

ESP32

slot_mode	slot_mask	Transmitted Data
		WS Low	WS High	WS Low	WS High	WS Low	WS High	WS Low	WS High
Mono	Left	11	0	12	0	13	0	14	0
	Right	0	11	0	12	0	13	0	14
	Both	11	12	13	14	15	16	17	18
Mono	Left	11	11	13	13	15	15	17	17
	Right	12	12	14	14	16	16	18	18
	Both	11	12	13	14	15	16	17	18

Modes combinations other than SlotMode::Mono/PdmSlotMask::Both, SlotMode::Stereo/PdmSlotMask::Left, and SlotMode::Stereo/PdmSlotMask::Right are unlikely to be useful since it requires precise demutiplexing on the bit stream based on the WS clock.

For details, refer to the ESP-IDF Programming Guide PDM Tx Usage details for your specific microcontroller:

• ESP32
• ESP32-S3
• ESP32-C3
• ESP32-C6
• ESP32-H2

Implementations

impl PdmTxSlotConfig

pub fn from_slot_mode(slot_mode: SlotMode) -> Self

Configure the PDM mode channel transmit slot configuration for the specified slot mode in 2 slots.

This sets the sigma-delta, low-pass, and sinc scaling to None.

For hardware version 1, the high-pass filter scaling is set to None.

For hardware version 2, the high-pass filter is enabled, scaled to dividing by 2 and set to 35.5 Hz.

pub fn slot_mode(self, slot_mode: SlotMode) -> Self

Sets the slot mode on this PDM transmit slot configuration.

pub fn sd_prescale(self, sd_prescale: u32) -> Self

Sets the sigma-delta filter prescale on this PDM transmit slot configuration.

pub fn sd_scale(self, sd_scale: PdmSignalScale) -> Self

Sets the sigma-delta filter scaling on this PDM transmit slot configuration.

pub fn hp_scale(self, hp_scale: PdmSignalScale) -> Self

Sets the high-pass filter scaling on this PDM transmit slot configuration.

pub fn lp_scale(self, lp_scale: PdmSignalScale) -> Self

Sets the low-pass filter scaling on this PDM transmit slot configuration.

pub fn sinc_scale(self, sinc_scale: PdmSignalScale) -> Self

Sets the sinc filter scaling on this PDM transmit slot configuration.

pub fn line_mode(self, line_mode: PdmTxLineMode) -> Self

Sets the PDM transmit line mode on this PDM transmit slot configuration.

pub fn hp_enable(self, hp_enable: bool) -> Self

Sets the high-pass filter enable on this PDM transmit slot configuration.

pub fn hp_cutoff_freq(self, hp_cutoff_freq: f32) -> Self

Sets the high-pass filter cutoff frequency on this PDM transmit slot configuration.

pub fn sd_dither(self, sd_dither: u32, sd_dither2: u32) -> Self

Sets the sigma-delta filter dither on this PDM transmit slot configuration.

Trait Implementations

impl Clone for PdmTxSlotConfig

fn clone(&self) -> PdmTxSlotConfig

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for PdmTxSlotConfig

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

Formats the value using the given formatter.

impl Default for PdmTxSlotConfig

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for PdmTxSlotConfig

fn eq(&self, other: &PdmTxSlotConfig) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for PdmTxSlotConfig

impl Eq for PdmTxSlotConfig

impl StructuralPartialEq for PdmTxSlotConfig