From 0ad4a4e585de9a125174c56d94e86353f61b6150 Mon Sep 17 00:00:00 2001
From: Diego Barrios Romero <eldruin@gmail.com>
Date: Mon, 29 Oct 2018 18:16:23 +0100
Subject: [PATCH] Add support for reading busy status

---
 src/ds323x/mod.rs    |  1 +
 src/ds323x/status.rs | 16 ++++++++++++++++
 src/lib.rs           |  2 ++
 tests/common/mod.rs  |  2 ++
 tests/status.rs      | 12 ++++++++++++
 5 files changed, 33 insertions(+)
 create mode 100644 src/ds323x/status.rs
 create mode 100644 tests/status.rs

diff --git a/src/ds323x/mod.rs b/src/ds323x/mod.rs
index 4a7a4bb..28ac75c 100644
--- a/src/ds323x/mod.rs
+++ b/src/ds323x/mod.rs
@@ -1,3 +1,4 @@
 mod configuration;
+mod status;
 mod datetime;
 pub use self::datetime::{ Hours, DateTime };
diff --git a/src/ds323x/status.rs b/src/ds323x/status.rs
new file mode 100644
index 0000000..4f9a73e
--- /dev/null
+++ b/src/ds323x/status.rs
@@ -0,0 +1,16 @@
+//! Device configuration
+
+extern crate embedded_hal as hal;
+use super::super::{ Ds323x, Register, BitFlags, Error };
+use interface::{ ReadData, WriteData };
+
+impl<DI, IC, E> Ds323x<DI, IC>
+where
+    DI: ReadData<Error = E> + WriteData<Error = E>
+{
+    /// Read busy status.
+    pub fn is_busy(&mut self) -> Result<bool, Error<E>> {
+        let status = self.iface.read_register(Register::STATUS)?;
+        Ok((status & BitFlags::BUSY) != 0)
+    }
+}
diff --git a/src/lib.rs b/src/lib.rs
index 2a48c29..a43ee01 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -285,6 +285,7 @@ impl Register {
     const MONTH     : u8 = 0x05;
     const YEAR      : u8 = 0x06;
     const CONTROL   : u8 = 0x0E;
+    const STATUS       : u8 = 0x0F;
 }
 
 struct BitFlags;
@@ -294,6 +295,7 @@ impl BitFlags {
     const AM_PM      : u8 = 0b0010_0000;
     const CENTURY    : u8 = 0b1000_0000;
     const EOSC       : u8 = 0b1000_0000;
+    const BUSY       : u8 = 0b0000_0100;
 }
 
 const DEVICE_ADDRESS: u8 = 0b110_1000;
diff --git a/tests/common/mod.rs b/tests/common/mod.rs
index cca98d7..9911e8e 100644
--- a/tests/common/mod.rs
+++ b/tests/common/mod.rs
@@ -17,6 +17,7 @@ impl Register {
     pub const DOM       : u8 = 0x04;
     pub const MONTH     : u8 = 0x05;
     pub const CONTROL   : u8 = 0x0E;
+    pub const STATUS       : u8 = 0x0F;
 }
 
 pub struct BitFlags;
@@ -24,6 +25,7 @@ pub struct BitFlags;
 #[allow(unused)]
 impl BitFlags {
     pub const EOSC       : u8 = 0b1000_0000;
+    pub const BUSY       : u8 = 0b0000_0100;
 }
 
 pub struct DummyOutputPin;
diff --git a/tests/status.rs b/tests/status.rs
new file mode 100644
index 0000000..7652c50
--- /dev/null
+++ b/tests/status.rs
@@ -0,0 +1,12 @@
+#[deny(warnings)]
+
+extern crate embedded_hal_mock as hal;
+use hal::i2c::Transaction as I2cTrans;
+use hal::spi::Transaction as SpiTrans;
+mod common;
+use common::{ DEVICE_ADDRESS as DEV_ADDR, Register, new_ds3231,
+              new_ds3232, new_ds3234, destroy_ds3231, destroy_ds3232,
+              destroy_ds3234, BitFlags as BF };
+
+get_param_test!(is_busy,     is_busy, STATUS, true, 0xFF);
+get_param_test!(is_not_busy, is_busy, STATUS, false, 0xFF & !BF::BUSY);
\ No newline at end of file