Struct esp_idf_sys::dac_continuous_config_t

#[repr(C)]
pub struct dac_continuous_config_t {
    pub chan_mask: dac_channel_mask_t,
    pub desc_num: u32,
    pub buf_size: usize,
    pub freq_hz: u32,
    pub offset: i8,
    pub clk_src: dac_continuous_digi_clk_src_t,
    pub chan_mode: dac_continuous_channel_mode_t,
}

@brief DAC continuous channels’ configurations

Fields

chan_mask: dac_channel_mask_t

< DAC channels’ mask for selecting which channels are used

desc_num: u32

< The number of DMA descriptor, at least 2 descriptors are required The number of descriptors is directly proportional to the max data buffer size while converting in cyclic output but only need to ensure it is greater than ‘1’ in acyclic output Typically, suggest to set the number bigger than 5, in case the DMA stopped while sending a short buffer

buf_size: usize

< The DMA buffer size, should be within 32~4092 bytes. Each DMA buffer will be attached to a DMA descriptor, i.e. the number of DMA buffer will be equal to the DMA descriptor number The DMA buffer size is not allowed to be greater than 4092 bytes The total DMA buffer size equal to desc_num * buf_size Typically, suggest to set the size to the multiple of 4

freq_hz: u32

< The frequency of DAC conversion in continuous mode, unit: Hz The supported range is related to the target and the clock source. For the clock DAC_DIGI_CLK_SRC_DEFAULT: the range is 19.6 KHz to several MHz on ESP32 and 77 Hz to several MHz on ESP32-S2. For the clock DAC_DIGI_CLK_SRC_APLL: the range is 648 Hz to several MHz on ESP32 and 6 Hz to several MHz on ESP32-S2. Typically not suggest to set the frequency higher than 2 MHz, otherwise the severe distortion will appear

offset: i8

< The offset of the DAC digital data. Range -128~127

clk_src: dac_continuous_digi_clk_src_t

< The clock source of digital controller, which can affect the range of supported frequency Currently DAC_DIGI_CLK_SRC_DEFAULT and DAC_DIGI_CLK_SRC_APLL are available

chan_mode: dac_continuous_channel_mode_t

< The channel mode of continuous mode, only take effect when multiple channels enabled, depends converting the buffer alternately or simultaneously

Trait Implementations

impl Clone for dac_continuous_config_t

fn clone(&self) -> dac_continuous_config_t

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for dac_continuous_config_t

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

Formats the value using the given formatter.

impl Default for dac_continuous_config_t

fn default() -> Self

Returns the “default value” for a type.

impl Copy for dac_continuous_config_t