Started to work on pedal_operations

Created a seperate struct for the pedals. Write functions are still empty. Later, I'll move the read function to this struct too.

src/main.rs

@@ -3,6 +3,7 @@
 //! `footswitch-rs` enables you to use footswitches of <xxx>
 
 mod key_operations;
+mod pedal_operations;
 
 #[macro_use]
 extern crate structopt;
@@ -30,8 +31,9 @@ struct Opt {
     output: Option<PathBuf>,
 }
 
-
 fn main() {
+    let pedals = pedal_operations::Pedals::new(); 
+    println!("{:?}", pedals.ped_data[1].length);
     check_sudo();
 
     let opt = Opt::from_args();
@@ -81,6 +83,7 @@ fn check_sudo() {
 }
 
 /// Read the current values of the pedals
+//ToDo: Move to pedals struct and split read and interpret functionality
 fn read_pedals(dev: & hidapi::HidDevice) {
     let column_width = 15;
     let total_width = (column_width+3)*3;
@@ -111,5 +114,4 @@ fn read_pedals(dev: & hidapi::HidDevice) {
 
     // Print simple footer
     println!("‖\n {}", "-".repeat(total_width));        
-}
-
+}

src/pedal_operations.rs

@@ -0,0 +1,62 @@
+extern crate hidapi;
+
+pub struct PedalsData {
+    header: [u8; 8],
+    data: [u8; 48],
+    pub length: i32,
+}
+
+pub struct Pedals {
+    start: [u8; 8],
+    pub ped_data: Vec<PedalsData>,
+}
+
+impl Pedals {
+    pub fn new() -> Pedals {
+        // Prepare variables
+        let start = [0x01u8, 0x80, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00];
+
+        let header_0 = [0x01u8, 0x81, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00];
+        let header_1 = [0x01u8, 0x81, 0x08, 0x01, 0x00, 0x00, 0x00, 0x00];
+        let header_2 = [0x01u8, 0x81, 0x08, 0x02, 0x00, 0x00, 0x00, 0x00];
+
+        let mut default_data = [0u8; 48];
+        default_data[0] = 0x08;
+
+        // Initialize actual object
+        Pedals { 
+            start: start,
+
+            ped_data: vec![
+                PedalsData {
+                    header: header_0,
+                    data: default_data,
+                    length: 8,
+                },
+                PedalsData {
+                    header: header_1,
+                    data: default_data,
+                    length: 8,
+                },
+                PedalsData {
+                    header: header_2,  
+                    data: default_data,
+                    length: 8,
+                },
+            ]
+        }
+    }
+
+    fn write_pedal(&self, dev: & hidapi::HidDevice, pedal: & PedalsData) {
+        dev.write(&pedal.header).unwrap();
+    }
+
+    pub fn write_pedals(&self, dev: & hidapi::HidDevice) {
+        dev.write(&self.start).unwrap();
+
+        for pedal in self.ped_data.iter() {
+            self.write_pedal(dev, &pedal)
+        }
+    }
+      
+}