Auto merge of rust-embedded#1 - japaric:delay, r=japaric

add implementations of hal::blocking::delay traits

None

Author: homunkulus

.travis.yml

@@ -0,0 +1,44 @@
+# Based on the "trust" template v0.1.2
+# https://github.com/japaric/trust/tree/v0.1.2
+
+dist: trusty
+language: rust
+services: docker
+
+matrix:
+  include:
+    # Linux
+    - env: TARGET=armv7-unknown-linux-gnueabihf
+      rust: nightly
+    - env: TARGET=x86_64-unknown-linux-gnu
+      rust: nightly
+
+before_install:
+  - set -e
+  - rustup self update
+
+install:
+  - bash ci/install.sh
+
+script:
+  - bash ci/script.sh
+
+after_script: set +e
+
+before_deploy:
+  - sh ci/before_deploy.sh
+
+cache: cargo
+before_cache:
+  # Travis can't cache files that are not readable by "others"
+  - chmod -R a+r $HOME/.cargo
+
+branches:
+  only:
+    - auto
+    - master
+    - try
+
+notifications:
+  email:
+    on_success: never

Cargo.toml

@@ -9,6 +9,7 @@ repository = "https://github.com/japaric/linux-embedded-hal"
 version = "0.1.0"
 
 [dependencies]
+cast = "0.2.2"
 embedded-hal = "0.1.0"
 spidev = "0.3.0"
 sysfs_gpio = "0.5.1"

ci/install.sh

@@ -0,0 +1,18 @@
+set -ex
+
+main() {
+    # This fetches latest stable release of Cross
+    local tag=$(git ls-remote --tags --refs --exit-code https://github.com/japaric/cross \
+                       | cut -d/ -f3 \
+                       | grep -E '^v[0.1.0-9.]+$' \
+                       | sort --version-sort \
+                       | tail -n1)
+
+    curl -LSfs https://japaric.github.io/trust/install.sh | \
+        sh -s -- \
+           --force \
+           --git japaric/cross \
+           --tag $tag
+}
+
+main

ci/script.sh

@@ -0,0 +1,9 @@
+# This script takes care of testing your crate
+
+set -euxo pipefail
+
+main() {
+    cross check --target $TARGET
+}
+
+main

src/lib.rs

@@ -13,16 +13,76 @@
 #![deny(missing_docs)]
 #![deny(warnings)]
 
+extern crate cast;
 extern crate embedded_hal as hal;
 pub extern crate spidev;
 pub extern crate sysfs_gpio;
 
 use std::io::{self, Write};
-use std::ops;
 use std::path::Path;
+use std::time::Duration;
+use std::{ops, thread};
 
+use cast::{u32, u64};
 use spidev::SpidevTransfer;
 
+/// 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))
+    }
+}
+
+impl hal::blocking::delay::DelayUs<u16> for Delay {
+    fn delay_us(&mut self, n: u16) {
+        thread::sleep(Duration::new(0, u32(n) * 1000))
+    }
+}
+
+impl hal::blocking::delay::DelayUs<u32> for Delay {
+    fn delay_us(&mut self, n: u32) {
+        let secs = n / 1_000_000;
+        let nsecs = (n % 1_000_000) * 1_000;
+
+        thread::sleep(Duration::new(u64(secs), nsecs))
+    }
+}
+
+impl hal::blocking::delay::DelayUs<u64> for Delay {
+    fn delay_us(&mut self, n: u64) {
+        let secs = n / 1_000_000;
+        let nsecs = ((n % 1_000_000) * 1_000) as u32;
+
+        thread::sleep(Duration::new(secs, nsecs))
+    }
+}
+
+impl hal::blocking::delay::DelayMs<u8> for Delay {
+    fn delay_ms(&mut self, n: u8) {
+        thread::sleep(Duration::from_millis(u64(n)))
+    }
+}
+
+impl hal::blocking::delay::DelayMs<u16> for Delay {
+    fn delay_ms(&mut self, n: u16) {
+        thread::sleep(Duration::from_millis(u64(n)))
+    }
+}
+
+impl hal::blocking::delay::DelayMs<u32> for Delay {
+    fn delay_ms(&mut self, n: u32) {
+        thread::sleep(Duration::from_millis(u64(n)))
+    }
+}
+
+impl hal::blocking::delay::DelayMs<u64> for Delay {
+    fn delay_ms(&mut self, n: u64) {
+        thread::sleep(Duration::from_millis(n))
+    }
+}
+
 /// Newtype around [`sysfs_gpio::Pin`] that implements the `embedded-hal` traits
 ///
 /// [`sysfs_gpio::Pin`]: https://docs.rs/sysfs_gpio/0.5.1/sysfs_gpio/struct.Pin.html