Crate spidev

Spidev

The spidev crate provides access to Linux spidev devices from rust. The wrapping of the interface is pretty direct and shouldn't cause any surprises.

Additional information on the interface may be found in the kernel documentation for spidev.

Examples

extern crate spidev;
use std::io;
use std::io::prelude::*;
use spidev::{Spidev, SpidevOptions, SpidevTransfer, SPI_MODE_0};

fn create_spi() -> io::Result<Spidev> {
    let mut spi = try!(Spidev::open("/dev/spidev0.0"));
    let options = SpidevOptions::new()
         .bits_per_word(8)
         .max_speed_hz(20_000)
         .mode(SPI_MODE_0)
         .build();
    try!(spi.configure(&options));
    Ok(spi)
}

/// perform half duplex operations using Read and Write traits
fn half_duplex(spi: &mut Spidev) -> io::Result<()> {
    let mut rx_buf = [0_u8; 10];
    try!(spi.write(&[0x01, 0x02, 0x03]));
    try!(spi.read(&mut rx_buf));
    println!("{:?}", rx_buf);
    Ok(())
}

/// Perform full duplex operations using Ioctl
fn full_duplex(spi: &mut Spidev) -> io::Result<()> {
    // "write" transfers are also reads at the same time with
    // the read having the same length as the write
    let tx_buf = [0x01, 0x02, 0x03];
    let mut rx_buf = [0; 3];
    {
        let mut transfer = SpidevTransfer::read_write(&tx_buf, &mut rx_buf);
        try!(spi.transfer(&mut transfer));
    }
    println!("{:?}", rx_buf);
    Ok(())
}

fn main() {
    let mut spi = create_spi().unwrap();
    println!("{:?}", half_duplex(&mut spi).unwrap());
    println!("{:?}", full_duplex(&mut spi).unwrap());
}

Reexports

pub use spidevioctl::SpidevTransfer;

Modules

spidevioctl

Structs

SpiModeFlags
Spidev	Provide high-level access to Linux Spidev Driver
SpidevOptions	Options that control defaults for communication on a device

Constants

SPI_3WIRE	SI/SO Signals Shared
SPI_CPHA	Clock Phase
SPI_CPOL	Clock Polarity
SPI_CS_HIGH	Chipselect Active High?
SPI_LOOP	Loopback Mode
SPI_LSB_FIRST	Per-word Bits On Wire
SPI_MODE_0
SPI_MODE_1
SPI_MODE_2
SPI_MODE_3
SPI_NO_CS	1 dev/bus, no chipselect
SPI_READY	Slave pulls low to pause
SPI_RX_DUAL	Receive with 2 wires
SPI_RX_QUAD	Receive with 4 wires
SPI_TX_DUAL	Transmit with 2 wires
SPI_TX_QUAD	Transmit with 4 wires