dds: add register macro

src/dds.rs

@@ -57,6 +57,9 @@ construct_bitmask!(CFR3Mask; u32;
 	DRV0,							28,	2
 )
 
+const WRITE_MASK 	:u8 = 0x00;
+const READ_MASK		:u8 = 0x80;
+
 pub struct DDS<SPI> {
 	spi: SPI,
 }
@@ -82,3 +85,54 @@ where
 		self.spi.transfer(words).map_err(Error::SPI)
 	}
 }
+
+macro_rules! impl_register_io {
+	($($reg_addr: expr, $reg_byte_size: expr),+) => {
+		impl<SPI, E> DDS<SPI>
+		where
+			SPI: Transfer<u8, Error = E>
+		{
+			pub fn write_register(&mut self, addr: u8, bytes: &mut[u8]) -> Result<(), Error<E>> {
+				match addr {
+					$(
+						$reg_addr => {
+							assert_eq!(bytes.len(), $reg_byte_size);
+							let arr: [u8; $reg_byte_size + 1] = [addr, 0; $reg_byte_size];
+							for i in 0..$reg_byte_size {
+								arr[i+1] = bytes[i];
+							}
+							match self.spi.transfer(words).map_err(Error<E>) {
+								Ok(v) => Ok(()),
+								Err(e) => Err(e),
+							},
+						},
+					)*
+				}
+			}
+		}
+	}
+}
+
+impl_register_io!(
+	0x00,	4,
+	0x01,	4,
+	0x02,	4,
+	0x03,	4,
+	0x04,	4,
+	0x07,	4,
+	0x08,	2,
+	0x09,	4,
+	0x0A,	4,
+	0x0B,	8,
+	0x0C,	8,
+	0x0D,	4,
+	0x0E,	8,
+	0x0F,	8,
+	0x10,	8,
+	0x11,	8,
+	0x12,	8,
+	0x13,	8,
+	0x14,	8,
+	0x15,	8,
+	0x16,	4
+);