dds: add get/set for sys_clk

src/dds.rs

@@ -726,6 +726,17 @@ where
 		}
 		Ok(error_count)
 	}
+
+	// Setter function for f_sys_clk
+	// Warning: This does not setup the chip to generate this actual f_sys_clk
+	pub(crate) fn set_f_sys_clk(&mut self, f_sys_clk: f64) {
+		self.f_sys_clk = f_sys_clk;
+	}
+
+	// Getter function for f_sys_clk
+	pub fn get_f_sys_clk(&mut self) -> f64 {
+		self.f_sys_clk
+	}
 }
 
 // Strong check for bytes passed to a register