Merge pull request #18 from martinsp/fix-readme-example

Fixes example in the readme

Author: posborne

README.md

@@ -21,24 +21,24 @@ practice.
 extern crate spidev;
 use std::io;
 use std::io::prelude::*;
-use spidev::{Spidev, SpidevOptions, SpidevTransfer, SPI_MODE_0};
+use spidev::{Spidev, SpidevOptions, SpidevTransfer, SpiModeFlags};
 
 fn create_spi() -> io::Result<Spidev> {
-    let mut spi = try!(Spidev::open("/dev/spidev0.0"));
+    let mut spi = Spidev::open("/dev/spidev0.0")?;
     let options = SpidevOptions::new()
          .bits_per_word(8)
          .max_speed_hz(20_000)
-         .mode(SPI_MODE_0)
+         .mode(SpiModeFlags::SPI_MODE_0)
          .build();
-    try!(spi.configure(&options));
+    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));
+    spi.write(&[0x01, 0x02, 0x03])?;
+    spi.read(&mut rx_buf)?;
     println!("{:?}", rx_buf);
     Ok(())
 }
@@ -51,7 +51,7 @@ fn full_duplex(spi: &mut Spidev) -> io::Result<()> {
     let mut rx_buf = [0; 3];
     {
         let mut transfer = SpidevTransfer::read_write(&tx_buf, &mut rx_buf);
-        try!(spi.transfer(&mut transfer));
+        spi.transfer(&mut transfer)?;
     }
     println!("{:?}", rx_buf);
     Ok(())