spi_transaction_t Struct Reference

One SPI transaction descriptor. More...

#include <spi_master.h>

Data Fields
uint32_t	flags
uint16_t	cmd
uint64_t	addr
size_t	length
size_t	rxlength
void *	user
union {
const void *   tx_buffer
uint8_t   tx_data [4]
};
union {
void *   rx_buffer
uint8_t   rx_data [4]
};

Detailed Description

One SPI transaction descriptor.

The descriptor must remain valid until the transaction completes (spi_device_transmit returns, or spi_device_get_trans_result hands the pointer back to the caller).

Field Documentation

flags

uint32_t spi_transaction_t::flags

SPI_TRANS_* bits.

cmd

uint16_t spi_transaction_t::cmd

Command data, right-aligned.

addr

uint64_t spi_transaction_t::addr

Address data, right-aligned.

length

size_t spi_transaction_t::length

Total transfer length, in bits.

rxlength

size_t spi_transaction_t::rxlength

Receive length in bits (0 == length).

user

void* spi_transaction_t::user

Opaque user pointer, passed to cbs.

tx_buffer

const void* spi_transaction_t::tx_buffer

tx_data

uint8_t spi_transaction_t::tx_data[4]

[union]

union { ... } spi_transaction_t

rx_buffer

void* spi_transaction_t::rx_buffer

rx_data

uint8_t spi_transaction_t::rx_data[4]

[union]

union { ... } spi_transaction_t