Add function to enable/disable the square wave generation

src/ds323x/configuration.rs

@@ -77,6 +77,17 @@ where
         self.write_control(control & !BitFlags::INTCN)
     }
 
+    /// Enable battery-backed square wave generation.
+    pub fn enable_square_wave(&mut self) -> Result<(), Error<E>> {
+        let control = self.control;
+        self.write_control(control | BitFlags::BBSQW)
+    }
+
+    /// Disable battery-backed square wave generation.
+    pub fn disable_square_wave(&mut self) -> Result<(), Error<E>> {
+        let control = self.control;
+        self.write_control(control & !BitFlags::BBSQW)
+    }
     fn write_control(&mut self, control: u8) -> Result<(), Error<E>> {
         self.iface.write_register(Register::CONTROL, control)?;
         self.control = control;

src/lib.rs

@@ -356,6 +356,7 @@ impl BitFlags {
     const AM_PM      : u8 = 0b0010_0000;
     const CENTURY    : u8 = 0b1000_0000;
     const EOSC       : u8 = 0b1000_0000;
+    const BBSQW      : u8 = 0b0100_0000;
     const TEMP_CONV  : u8 = 0b0010_0000;
     const INTCN      : u8 = 0b0000_0100;
     const BUSY       : u8 = 0b0000_0100;

tests/common/mod.rs

@@ -29,6 +29,7 @@ pub struct BitFlags;
 #[allow(unused)]
 impl BitFlags {
     pub const EOSC       : u8 = 0b1000_0000;
+    pub const BBSQW      : u8 = 0b0100_0000;
     pub const TEMP_CONV  : u8 = 0b0010_0000;
     pub const INTCN      : u8 = 0b0000_0100;
     pub const BUSY       : u8 = 0b0000_0100;

tests/configuration.rs

@@ -62,3 +62,6 @@ get_param_test!(get_aging_offset_max, get_aging_offset, AGING_OFFSET,  127, 127)
 call_method_test!(int_sqw_out_int, use_int_sqw_output_as_interrupt,   CONTROL, CONTROL_POR_VALUE |  BF::INTCN);
 call_method_test!(int_sqw_out_sqw, use_int_sqw_output_as_square_wave, CONTROL, CONTROL_POR_VALUE & !BF::INTCN);
 
+call_method_test!(enable_sqw,  enable_square_wave,  CONTROL, CONTROL_POR_VALUE |  BF::BBSQW);
+call_method_test!(disable_sqw, disable_square_wave, CONTROL, CONTROL_POR_VALUE & !BF::BBSQW);
+