Struct spi_transaction_t

#[repr(C)]
pub struct spi_transaction_t {
    pub flags: u32,
    pub cmd: u16,
    pub addr: u64,
    pub length: usize,
    pub rxlength: usize,
    pub user: *mut c_void,
    pub __bindgen_anon_1: spi_transaction_t__bindgen_ty_1,
    pub __bindgen_anon_2: spi_transaction_t__bindgen_ty_2,
}

This structure describes one SPI transaction. The descriptor should not be modified until the transaction finishes.

Fields

flags: u32

< Bitwise OR of SPI_TRANS_* flags

cmd: u16

< Command data, of which the length is set in the command_bits of spi_device_interface_config_t.

NOTE: this field, used to be “command” in ESP-IDF 2.1 and before, is re-written to be used in a new way in ESP-IDF 3.0.

Example: write 0x0123 and command_bits=12 to send command 0x12, 0x3_ (in previous version, you may have to write 0x3_12).

addr: u64

< Address data, of which the length is set in the address_bits of spi_device_interface_config_t.

NOTE: this field, used to be “address” in ESP-IDF 2.1 and before, is re-written to be used in a new way in ESP-IDF3.0.

Example: write 0x123400 and address_bits=24 to send address of 0x12, 0x34, 0x00 (in previous version, you may have to write 0x12340000).

length: usize

< Total data length, in bits

rxlength: usize

< Total data length received, should be not greater than length in full-duplex mode (0 defaults this to the value of length).

user: *mut c_void

< User-defined variable. Can be used to store eg transaction ID.

__bindgen_anon_1: spi_transaction_t__bindgen_ty_1

__bindgen_anon_2: spi_transaction_t__bindgen_ty_2

Trait Implementations

impl Clone for spi_transaction_t

fn clone(&self) -> spi_transaction_t

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Default for spi_transaction_t

fn default() -> spi_transaction_t

Returns the “default value” for a type.

impl Copy for spi_transaction_t