Adapt to embedded-hal-1.0.0-alpha.1

Author: eldruin

Cargo.toml

@@ -15,7 +15,7 @@ gpio_cdev = ["gpio-cdev"]
 default = [ "gpio_cdev", "gpio_sysfs" ]
 
 [dependencies]
-embedded-hal = { version = "0.2.3", features = ["unproven"] }
+embedded-hal = "=1.0.0-alpha.1"
 gpio-cdev = { version = "0.3", optional = true }
 sysfs_gpio = { version = "0.5", optional = true }
 
@@ -24,7 +24,6 @@ nb = "0.1.1"
 serial-core = "0.4.0"
 serial-unix = "0.4.0"
 spidev = "0.4"
-void = "1"
 
 [dev-dependencies]
 openpty = "0.1.0"

src/cdev_pin.rs

@@ -15,31 +15,31 @@ impl CdevPin {
     }
 }
 
-impl hal::digital::v2::OutputPin for CdevPin {
+impl hal::digital::OutputPin for CdevPin {
     type Error = gpio_cdev::errors::Error;
 
-    fn set_low(&mut self) -> Result<(), Self::Error> {
+    fn try_set_low(&mut self) -> Result<(), Self::Error> {
         self.0.set_value(0)
     }
 
-    fn set_high(&mut self) -> Result<(), Self::Error> {
+    fn try_set_high(&mut self) -> Result<(), Self::Error> {
         self.0.set_value(1)
     }
 }
 
-impl hal::digital::v2::InputPin for CdevPin {
+impl hal::digital::InputPin for CdevPin {
     type Error = gpio_cdev::errors::Error;
 
-    fn is_high(&self) -> Result<bool, Self::Error> {
+    fn try_is_high(&self) -> Result<bool, Self::Error> {
         if !self.1 {
             self.0.get_value().map(|val| val != 0)
         } else {
             self.0.get_value().map(|val| val == 0)
         }
     }
 
-    fn is_low(&self) -> Result<bool, Self::Error> {
-        self.is_high().map(|val| !val)
+    fn try_is_low(&self) -> Result<bool, Self::Error> {
+        self.try_is_high().map(|val| !val)
     }
 }
 

src/lib.rs

@@ -16,19 +16,18 @@ extern crate cast;
 extern crate core;
 extern crate embedded_hal as hal;
 pub extern crate i2cdev;
-pub extern crate spidev;
-pub extern crate serial_unix;
-pub extern crate serial_core;
 pub extern crate nb;
-
+pub extern crate serial_core;
+pub extern crate serial_unix;
+pub extern crate spidev;
 
 #[cfg(feature = "gpio_sysfs")]
 pub extern crate sysfs_gpio;
 
 #[cfg(feature = "gpio_cdev")]
 pub extern crate gpio_cdev;
 
-
+use core::convert::Infallible;
 use std::io::{self, Write};
 use std::path::{Path, PathBuf};
 use std::time::Duration;
@@ -60,65 +59,87 @@ pub use cdev_pin::CdevPin;
 /// Sysfs pin re-export
 pub use sysfs_pin::SysfsPin;
 
-
 /// Empty struct that provides delay functionality on top of `thread::sleep`
 pub struct Delay;
 
 impl hal::blocking::delay::DelayUs<u8> for Delay {
-    fn delay_us(&mut self, n: u8) {
-        thread::sleep(Duration::new(0, u32(n) * 1000))
+    type Error = Infallible;
+
+    fn try_delay_us(&mut self, n: u8) -> Result<(), Self::Error> {
+        thread::sleep(Duration::new(0, u32(n) * 1000));
+        Ok(())
     }
 }
 
 impl hal::blocking::delay::DelayUs<u16> for Delay {
-    fn delay_us(&mut self, n: u16) {
-        thread::sleep(Duration::new(0, u32(n) * 1000))
+    type Error = Infallible;
+
+    fn try_delay_us(&mut self, n: u16) -> Result<(), Self::Error> {
+        thread::sleep(Duration::new(0, u32(n) * 1000));
+        Ok(())
     }
 }
 
 impl hal::blocking::delay::DelayUs<u32> for Delay {
-    fn delay_us(&mut self, n: u32) {
+    type Error = Infallible;
+
+    fn try_delay_us(&mut self, n: u32) -> Result<(), Self::Error> {
         let secs = n / 1_000_000;
         let nsecs = (n % 1_000_000) * 1_000;
 
-        thread::sleep(Duration::new(u64(secs), nsecs))
+        thread::sleep(Duration::new(u64(secs), nsecs));
+        Ok(())
     }
 }
 
 impl hal::blocking::delay::DelayUs<u64> for Delay {
-    fn delay_us(&mut self, n: u64) {
+    type Error = Infallible;
+
+    fn try_delay_us(&mut self, n: u64) -> Result<(), Self::Error> {
         let secs = n / 1_000_000;
         let nsecs = ((n % 1_000_000) * 1_000) as u32;
 
-        thread::sleep(Duration::new(secs, nsecs))
+        thread::sleep(Duration::new(secs, nsecs));
+        Ok(())
     }
 }
 
 impl hal::blocking::delay::DelayMs<u8> for Delay {
-    fn delay_ms(&mut self, n: u8) {
-        thread::sleep(Duration::from_millis(u64(n)))
+    type Error = Infallible;
+
+    fn try_delay_ms(&mut self, n: u8) -> Result<(), Self::Error> {
+        thread::sleep(Duration::from_millis(u64(n)));
+        Ok(())
     }
 }
 
 impl hal::blocking::delay::DelayMs<u16> for Delay {
-    fn delay_ms(&mut self, n: u16) {
-        thread::sleep(Duration::from_millis(u64(n)))
+    type Error = Infallible;
+
+    fn try_delay_ms(&mut self, n: u16) -> Result<(), Self::Error> {
+        thread::sleep(Duration::from_millis(u64(n)));
+        Ok(())
     }
 }
 
 impl hal::blocking::delay::DelayMs<u32> for Delay {
-    fn delay_ms(&mut self, n: u32) {
-        thread::sleep(Duration::from_millis(u64(n)))
+    type Error = Infallible;
+
+    fn try_delay_ms(&mut self, n: u32) -> Result<(), Self::Error> {
+        thread::sleep(Duration::from_millis(u64(n)));
+        Ok(())
     }
 }
 
 impl hal::blocking::delay::DelayMs<u64> for Delay {
-    fn delay_ms(&mut self, n: u64) {
-        thread::sleep(Duration::from_millis(n))
+    type Error = Infallible;
+
+    fn try_delay_ms(&mut self, n: u64) -> Result<(), Self::Error> {
+        thread::sleep(Duration::from_millis(n));
+        Ok(())
     }
 }
 
-
 /// Newtype around [`i2cdev::linux::LinuxI2CDevice`] that implements the `embedded-hal` traits
 ///
 /// [`i2cdev::linux::LinuxI2CDevice`]: https://docs.rs/i2cdev/0.3.1/i2cdev/linux/struct.LinuxI2CDevice.html
@@ -156,7 +177,7 @@ impl I2cdev {
 impl hal::blocking::i2c::Read for I2cdev {
     type Error = i2cdev::linux::LinuxI2CError;
 
-    fn read(&mut self, address: u8, buffer: &mut [u8]) -> Result<(), Self::Error> {
+    fn try_read(&mut self, address: u8, buffer: &mut [u8]) -> Result<(), Self::Error> {
         self.set_address(address)?;
         self.inner.read(buffer)
     }
@@ -165,7 +186,7 @@ impl hal::blocking::i2c::Read for I2cdev {
 impl hal::blocking::i2c::Write for I2cdev {
     type Error = i2cdev::linux::LinuxI2CError;
 
-    fn write(&mut self, address: u8, bytes: &[u8]) -> Result<(), Self::Error> {
+    fn try_write(&mut self, address: u8, bytes: &[u8]) -> Result<(), Self::Error> {
         self.set_address(address)?;
         self.inner.write(bytes)
     }
@@ -174,7 +195,7 @@ impl hal::blocking::i2c::Write for I2cdev {
 impl hal::blocking::i2c::WriteRead for I2cdev {
     type Error = i2cdev::linux::LinuxI2CError;
 
-    fn write_read(
+    fn try_write_read(
         &mut self,
         address: u8,
         bytes: &[u8],
@@ -220,7 +241,7 @@ impl Spidev {
 impl hal::blocking::spi::Transfer<u8> for Spidev {
     type Error = io::Error;
 
-    fn transfer<'b>(&mut self, buffer: &'b mut [u8]) -> io::Result<&'b [u8]> {
+    fn try_transfer<'b>(&mut self, buffer: &'b mut [u8]) -> io::Result<&'b [u8]> {
         let tx = buffer.to_owned();
         self.0
             .transfer(&mut SpidevTransfer::read_write(&tx, buffer))?;
@@ -231,7 +252,7 @@ impl hal::blocking::spi::Transfer<u8> for Spidev {
 impl hal::blocking::spi::Write<u8> for Spidev {
     type Error = io::Error;
 
-    fn write(&mut self, buffer: &[u8]) -> io::Result<()> {
+    fn try_write(&mut self, buffer: &[u8]) -> io::Result<()> {
         self.0.write_all(buffer)
     }
 }

src/serial.rs

@@ -33,7 +33,7 @@ fn translate_io_errors(err: std::io::Error) -> nb::Error<IoErrorKind> {
 impl hal::serial::Read<u8> for Serial {
     type Error = IoErrorKind;
 
-    fn read(&mut self) -> nb::Result<u8, Self::Error> {
+    fn try_read(&mut self) -> nb::Result<u8, Self::Error> {
         let mut buffer = [0; 1];
         let bytes_read = self.0.read(&mut buffer).map_err(translate_io_errors)?;
         if bytes_read == 1 {
@@ -47,12 +47,12 @@ impl hal::serial::Read<u8> for Serial {
 impl hal::serial::Write<u8> for Serial {
     type Error = IoErrorKind;
 
-    fn write(&mut self, word: u8) -> nb::Result<(), Self::Error> {
+    fn try_write(&mut self, word: u8) -> nb::Result<(), Self::Error> {
         self.0.write(&[word]).map_err(translate_io_errors)?;
         Ok(())
     }
 
-    fn flush(&mut self) -> nb::Result<(), Self::Error> {
+    fn try_flush(&mut self) -> nb::Result<(), Self::Error> {
         self.0.flush().map_err(translate_io_errors)
     }
 }
@@ -76,20 +76,20 @@ mod test {
     #[test]
     fn test_empty_read() {
         let (mut _master, mut serial) = create_pty_and_serial();
-        assert_eq!(Err(nb::Error::WouldBlock), serial.read());
+        assert_eq!(Err(nb::Error::WouldBlock), serial.try_read());
     }
 
     #[test]
     fn test_read() {
         let (mut master, mut serial) = create_pty_and_serial();
         master.write(&[1]).expect("Write failed");
-        assert_eq!(Ok(1), serial.read());
+        assert_eq!(Ok(1), serial.try_read());
     }
 
     #[test]
     fn test_write() {
         let (mut master, mut serial) = create_pty_and_serial();
-        serial.write(2).expect("Write failed");
+        serial.try_write(2).expect("Write failed");
         let mut buf = [0; 2];
         assert_eq!(1, master.read(&mut buf).unwrap());
         assert_eq!(buf, [2, 0]);

src/sysfs_pin.rs

@@ -26,31 +26,31 @@ impl SysfsPin {
     }
 }
 
-impl hal::digital::v2::OutputPin for SysfsPin {
+impl hal::digital::OutputPin for SysfsPin {
     type Error = sysfs_gpio::Error;
 
-    fn set_low(&mut self) -> Result<(), Self::Error> {
+    fn try_set_low(&mut self) -> Result<(), Self::Error> {
         self.0.set_value(0)
     }
 
-    fn set_high(&mut self) -> Result<(), Self::Error> {
+    fn try_set_high(&mut self) -> Result<(), Self::Error> {
         self.0.set_value(1)
     }
 }
 
-impl hal::digital::v2::InputPin for SysfsPin {
+impl hal::digital::InputPin for SysfsPin {
     type Error = sysfs_gpio::Error;
 
-    fn is_high(&self) -> Result<bool, Self::Error> {
+    fn try_is_high(&self) -> Result<bool, Self::Error> {
         if !self.0.get_active_low()? {
             self.0.get_value().map(|val| val != 0)
         } else {
             self.0.get_value().map(|val| val == 0)
         }
     }
 
-    fn is_low(&self) -> Result<bool, Self::Error> {
-        self.is_high().map(|val| !val)
+    fn try_is_low(&self) -> Result<bool, Self::Error> {
+        self.try_is_high().map(|val| !val)
     }
 }
 

src/timer.rs

@@ -1,5 +1,6 @@
 //! Timers.
 
+use core::convert::Infallible;
 use std::time::{Duration, Instant};
 
 use hal::timer::{CountDown, Periodic};
@@ -27,17 +28,19 @@ impl SysTimer {
 }
 
 impl CountDown for SysTimer {
+    type Error = Infallible;
     type Time = Duration;
 
-    fn start<T>(&mut self, count: T)
+    fn try_start<T>(&mut self, count: T) -> Result<(), Self::Error>
     where
         T: Into<Self::Time>,
     {
         self.start = Instant::now();
         self.duration = count.into();
+        Ok(())
     }
 
-    fn wait(&mut self) -> nb::Result<(), void::Void> {
+    fn try_wait(&mut self) -> nb::Result<(), Self::Error> {
         if (Instant::now() - self.start) >= self.duration {
             // Restart the timer to fulfill the contract by `Periodic`
             self.start = Instant::now();
@@ -60,8 +63,8 @@ mod tests {
     fn test_delay() {
         let mut timer = SysTimer::new();
         let before = Instant::now();
-        timer.start(Duration::from_millis(100));
-        nb::block!(timer.wait()).unwrap();
+        timer.try_start(Duration::from_millis(100)).unwrap();
+        nb::block!(timer.try_wait()).unwrap();
         let after = Instant::now();
         let duration_ms = (after - before).as_millis();
         assert!(duration_ms >= 100);
@@ -73,13 +76,13 @@ mod tests {
     fn test_periodic() {
         let mut timer = SysTimer::new();
         let before = Instant::now();
-        timer.start(Duration::from_millis(100));
-        nb::block!(timer.wait()).unwrap();
+        timer.try_start(Duration::from_millis(100)).unwrap();
+        nb::block!(timer.try_wait()).unwrap();
         let after1 = Instant::now();
         let duration_ms_1 = (after1 - before).as_millis();
         assert!(duration_ms_1 >= 100);
         assert!(duration_ms_1 < 500);
-        nb::block!(timer.wait()).unwrap();
+        nb::block!(timer.try_wait()).unwrap();
         let after2 = Instant::now();
         let duration_ms_2 = (after2 - after1).as_millis();
         assert!(duration_ms_2 >= 100);