Refactoring

Swaps a few things around, and adds some better types

Cargo.toml

@@ -9,4 +9,4 @@ edition = "2018"
 [dependencies]
 embedded-hal = "0.2.2"
 nb = "0.1.2"
-usb-device = {version = "0.2.3", path = "../usb-device" }  
+usb-device = {version = "0.2.3"}  

src/data/midi/code_index_number.rs

@@ -0,0 +1,63 @@
+use crate::util::try_from::{TryFrom};
+
+/// The Code Index Number(CIN) indicates the classification 
+/// of the bytes in the MIDI_x fields
+pub struct CodeIndexNumber(u8);
+ 
+impl TryFrom<u8> for CodeIndexNumber {
+
+    fn try_from(value:u8) -> Option<Self> {
+        if value > 0xF {
+            None
+        } else {
+            Some(CodeIndexNumber(value))
+        }
+    }
+}
+
+impl Into<u8> for CodeIndexNumber {
+    fn into(self) -> u8 {
+        self.0
+    }
+}
+
+
+impl CodeIndexNumber {
+
+    /// Miscellaneous function codes. Reserved for future extensions
+    pub const MISC_FUNCTION : CodeIndexNumber = CodeIndexNumber(0x00);
+    /// Cable events. Reserved for future expansion.
+    pub const CABLE_EVENTS : CodeIndexNumber = CodeIndexNumber(0x1);
+    /// Two-byte System Common messages like MTC, SongSelect, etc.
+    pub const SYSTEM_COMMON_LEN2 :CodeIndexNumber = CodeIndexNumber(0x2);
+    /// Three-byte System Common messages like SPP, etc.
+    pub const SYSTEM_COMMON_LEN3 :CodeIndexNumber = CodeIndexNumber(0x3);
+    /// SysEx starts or continues
+    pub const SYSEX_STARTS : CodeIndexNumber = CodeIndexNumber(0x4);
+    pub const SYSEX_CONTINUES : CodeIndexNumber = CodeIndexNumber::SYSEX_STARTS;
+    /// Single-byte System Common Message or SysEx ends with following single byte.
+    pub const SYSTEM_COMMON_LEN1 : CodeIndexNumber= CodeIndexNumber(0x5);
+    /// SysEx ends with the following byte
+    pub const SYSEX_ENDS_NEXT1 :CodeIndexNumber = CodeIndexNumber::SYSTEM_COMMON_LEN1;
+    /// SysEx ends with following two bytes
+    pub const SYSEX_ENDS_NEXT2 : CodeIndexNumber = CodeIndexNumber(0x6);
+    /// SysEx ends with following three bytes
+    pub const SYSEX_ENDS_NEXT3 : CodeIndexNumber = CodeIndexNumber(0x7);
+    /// Note - Off
+    pub const NOTE_OFF : CodeIndexNumber = CodeIndexNumber(0x8);
+    /// Note - On
+    pub const NOTE_ON : CodeIndexNumber = CodeIndexNumber(0x9);
+    /// Poly-KeyPress
+    pub const POLY_KEYPRESS : CodeIndexNumber = CodeIndexNumber(0xA);
+    /// Control Change
+    pub const CONTROL_CHANGE : CodeIndexNumber = CodeIndexNumber(0xB);
+    /// Program Change
+    pub const PROGRAM_CHANGE : CodeIndexNumber = CodeIndexNumber(0xC);
+    /// Channel Pressure
+    pub const CHANNEL_PRESSURE : CodeIndexNumber = CodeIndexNumber(0xD);
+    /// Pitch Bend Change
+    pub const PITCHBEND_CHANGE : CodeIndexNumber = CodeIndexNumber(0xE);
+    /// Single Byte
+    pub const SINGLE_BYTE : CodeIndexNumber= CodeIndexNumber(0xF);
+ 
+}

src/data/midi/midi_channel.rs

@@ -0,0 +1,25 @@
+use crate::util::try_from::{TryFrom};
+
+/// The MidiChannel is a value ranging from 0x0 to 0xF 
+/// This is a standard midi concept
+pub struct MidiChannel(u8);
+
+
+impl TryFrom<u8> for MidiChannel {
+
+    fn try_from(value:u8) -> Option<MidiChannel> {
+        if value > 0xF {
+            None
+        } else {
+            Some(MidiChannel(value))
+        }
+    }
+}
+
+impl Into<u8> for MidiChannel {
+    fn into(self) -> u8 {
+        self.0
+    }
+}
+
+

src/data/midi/mod.rs

@@ -0,0 +1,3 @@
+pub mod notes;
+pub mod code_index_number;
+pub mod midi_channel;

src/data/midi/notes.rs

@@ -1,121 +1,35 @@
 
-//A simple enum type that represents all the midi 'notes'
-//note the flat versions are associated constants
-//but can be referenced like Note::Bb3
+/// A simple enum type that represents all the midi 'notes'
+/// note the flat versions are associated constants
+/// but can be referenced like Note::Bb3
+/// C1m is the C-1
 #[derive(Debug)]
 #[repr(u8)]
 pub enum Note {
-    A0 = 21,
-    As0,
-    B0,
-    C1,
-    Cs1,
-    D1,
-    Ds1,
-    E1,
-    F1,
-    Fs1,
-    G1,
-    Gs1,
-    A1,
-    As1,
-    B1,
-    C2,
-    Cs2,
-    D2,
-    Ds2,
-    E2,
-    F2,
-    Fs2,
-    G2,
-    Gs2,
-    A2,
-    As2,
-    B2,
-    C3,
-    Cs3,
-    D3,
-    Ds3,
-    E3,
-    F3,
-    Fs3,
-    G3,
-    Gs3,
-    A3,
-    As3,
-    B3,
-    C4,
-    Cs4,
-    D4,
-    Ds4,
-    E4,
-    F4,
-    Fs4,
-    G4,
-    Gs4,
-    A4,
-    As4,
-    B4,
-    C5,
-    Cs5,
-    D5,
-    Ds5,
-    E5,
-    F5,
-    Fs5,
-    G5,
-    Gs5,
-    A5,
-    As5,
-    B5,
-    C6,
-    Cs6,
-    D6,
-    Ds6,
-    E6,
-    F6,
-    Fs6,
-    G6,
-    Gs6,
-    A6,
-    As6,
-    B6,
-    C7,
-    Cs7,
-    D7,
-    Ds7,
-    E7,
-    F7,
-    Fs7,
-    G7,
-    Gs7,
-    A7,
-    As7,
-    B7,
-    C8,
-    Cs8,
-    D8,
-    Ds8,
-    E8,
-    F8,
-    Fs8,
-    G8,
-    Gs8,
-    A8,
-    As8,
-    B8,
-    C9,
-    Cs9,
-    D9,
-    Ds9,
-    E9,
-    F9,
-    Fs9,
-    G9,
-    Gs9
+    C1m, Cs1m, D1m, Ds1m, E1m, F1m, Fs1m, G1m, Gs1m, A1m, As1m, B1m,
+    C0 , Cs0 , D0 , Ds0 , E0 , F0 , Fs0 , G0 , Gs0 , A0 , As0 , B0 ,
+    C1 , Cs1 , D1 , Ds1 , E1 , F1 , Fs1 , G1 , Gs1 , A1 , As1 , B1 , 
+    C2 , Cs2 , D2 , Ds2 , E2 , F2 , Fs2 , G2 , Gs2 , A2 , As2 , B2 ,
+    C3 , Cs3 , D3 , Ds3 , E3 , F3 , Fs3 , G3 , Gs3 , A3 , As3 , B3 ,
+    C4 , Cs4 , D4 , Ds4 , E4 , F4 , Fs4 , G4 , Gs4 , A4 , As4 , B4 ,
+    C5 , Cs5 , D5 , Ds5 , E5 , F5 , Fs5 , G5 , Gs5 , A5 , As5 , B5 ,
+    C6 , Cs6 , D6 , Ds6 , E6 , F6 , Fs6 , G6 , Gs6 , A6 , As6 , B6 ,
+    C7 , Cs7 , D7 , Ds7 , E7 , F7 , Fs7 , G7 , Gs7 , A7 , As7 , B7 ,
+    C8 , Cs8 , D8 , Ds8 , E8 , F8 , Fs8 , G8 , Gs8 , A8 , As8 , B8 ,
+    C9 , Cs9 , D9 , Ds9 , E9 , F9 , Fs9 , G9 , Gs9
 }
 
 impl Note {
+    #[allow(non_upper_case_globals)] pub const Db1m : Note = Note::Cs1m;
+    #[allow(non_upper_case_globals)] pub const Eb1m : Note = Note::Ds1m;
+    #[allow(non_upper_case_globals)] pub const Gb1m : Note = Note::Fs1m;
+    #[allow(non_upper_case_globals)] pub const Ab1m : Note = Note::Gs1m;
+    #[allow(non_upper_case_globals)] pub const Bb1m : Note = Note::As1m;
+    #[allow(non_upper_case_globals)] pub const Db0 : Note = Note::Cs0;
+    #[allow(non_upper_case_globals)] pub const Eb0 : Note = Note::Ds0;
+    #[allow(non_upper_case_globals)] pub const Gb0 : Note = Note::Fs0;
+    #[allow(non_upper_case_globals)] pub const Ab0 : Note = Note::Gs0;
+    #[allow(non_upper_case_globals)] pub const Bb0 : Note = Note::As0;
     #[allow(non_upper_case_globals)] pub const Db1 : Note = Note::Cs1;
     #[allow(non_upper_case_globals)] pub const Eb1 : Note = Note::Ds1;
     #[allow(non_upper_case_globals)] pub const Gb1 : Note = Note::Fs1;
@@ -182,6 +96,40 @@ mod tests {
     //These test mainly prove we are generating all the sharps/flats
     //(as the same number) correctly.
     note_test! {
+            note_c1m:   (Note::C1m,0),
+            note_cs1m:  (Note::Cs1m,1),
+            note_db1m:  (Note::Db1m,1),
+            note_d1m:   (Note::D1m,2),
+            note_ds1m:  (Note::Ds1m,3),
+            note_eb1m:  (Note::Eb1m,3),
+            note_e1m:   (Note::E1m,4),
+            note_f1m:   (Note::F1m,5),
+            note_fs1m:  (Note::Fs1m,6),
+            note_gb1m:  (Note::Gb1m,6),
+            note_g1m:   (Note::G1m,7),
+            note_gs1m:  (Note::Gs1m,8),
+            note_ab1m:  (Note::Ab1m,8),
+            note_a1m:   (Note::A1m,9),
+            note_as1m:  (Note::As1m,10),
+            note_bb1m:  (Note::Bb1m,10),
+            note_b1m:   (Note::B1m,11),
+            note_c0:    (Note::C0,12),
+            note_cs0:   (Note::Cs0,13),
+            note_db0:   (Note::Db0,13),
+            note_d0:    (Note::D0,14),
+            note_ds0:   (Note::Ds0,15),
+            note_eb0:   (Note::Eb0,15),
+            note_e0:    (Note::E0,16),
+            note_f0:    (Note::F0,17),
+            note_fs0:   (Note::Fs0,18),
+            note_gb0:   (Note::Gb0,18),
+            note_g0:    (Note::G0,19),
+            note_gs0:   (Note::Gs0,20),
+            note_ab0:   (Note::Ab0,20),
+            note_a0:    (Note::A0,21),
+            note_as0:   (Note::As0,22),
+            note_bb0:   (Note::Bb0,22),
+            note_b0:    (Note::B0,23),
             note_c1:    (Note::C1,24),
             note_cs1:   (Note::Cs1,25),
             note_db1:   (Note::Db1,25),

src/data/mod.rs

@@ -0,0 +1,3 @@
+pub mod midi;
+pub mod usb;
+pub mod usb_midi;

src/data/usb/mod.rs

@@ -0,0 +1 @@
+pub mod constants;

src/data/usb_midi/cable_number.rs

@@ -0,0 +1,23 @@
+use crate::util::try_from::{TryFrom};
+
+/// The Cable Number (CN) is a value ranging from 0x0 to 0xF 
+/// indicating the number assignment of the Embedded MIDI Jack associated 
+/// with the endpoint that is transferring the data
+pub struct CableNumber(u8);
+
+impl TryFrom<u8> for CableNumber {
+
+    fn try_from(value:u8) -> Option<Self> {
+        if value > 0xF {
+            None
+        } else {
+            Some(CableNumber(value))
+        }
+    }
+}
+
+impl Into<u8> for CableNumber {
+    fn into(self) -> u8 {
+        self.0
+    }
+}

src/data/usb_midi/mod.rs

@@ -0,0 +1,2 @@
+pub mod usb_midi_event_packet;
+pub mod cable_number;

src/data/usb_midi/usb_midi_event_packet.rs

@@ -0,0 +1,57 @@
+use crate::data::usb_midi::cable_number::CableNumber;
+use crate::data::midi::code_index_number::CodeIndexNumber;
+use crate::data::midi::notes::Note;
+use crate::data::midi::midi_channel::MidiChannel;
+
+/// A packet that communicates with the host
+/// Note that the payload seems fairly 'open'
+/// It's contents can depend on the cable/code index number
+/// but may not!?
+pub struct UsbMidiEventPacket {
+    cable_number : CableNumber,
+    code_index_number: CodeIndexNumber,
+    payload: [u8;3]
+}
+
+/// Combines two nibbles.
+/// Note that the upper will overflow if greater than 0xF
+/// The lower will be clamped to the range 0-0xF
+fn combine_nibble(upper:u8,lower:u8) -> u8 {
+    let upper = upper.overflowing_shl(8).0;
+    let lower = lower & 0xF;
+    upper | lower
+}
+
+/// Constructs a note-on midi message given the cable, note and velocity
+pub fn note_on( cable:CableNumber,
+                channel: MidiChannel,
+                note:Note, 
+                velocity: u8) -> UsbMidiEventPacket {
+         
+    let code :u8  = CodeIndexNumber::NOTE_ON.into();                    
+    let channel : u8 = channel.into();   
+    
+    UsbMidiEventPacket{
+        cable_number : cable,
+        code_index_number : CodeIndexNumber::NOTE_ON,
+        payload : [ code & channel,
+                    note as u8,
+                    velocity        
+                  ] 
+    }
+}
+impl Into<[u8;4]> for UsbMidiEventPacket {
+    /// Converts the midi packet into a byte array
+    /// suitable for transfer via usb
+    fn into(self) -> [u8;4] {
+        let cable_number : u8 = self.cable_number.into();
+        let index_number : u8 = self.code_index_number.into();
+        let header = combine_nibble(cable_number,index_number);
+        [   header,
+            self.payload[0],
+            self.payload[1],
+            self.payload[2]
+        ]
+    }
+}
+

src/lib.rs

@@ -1,9 +1,6 @@
 #![no_std]
-mod usb_constants;
-mod midi_device;
-mod notes;
 
-pub use usb_device::{Result,UsbError};
-pub use crate::usb_constants::USB_CLASS_NONE;
-pub use crate::midi_device::*;
-pub use crate::notes::Note;
+mod util;
+pub mod data;
+pub mod midi_device;
+

src/midi_device.rs

@@ -1,7 +1,8 @@
 use usb_device::class_prelude::*;
 use usb_device::Result;
-use crate::notes::Note;
-use crate::usb_constants::*;
+use crate::data::midi::notes::Note;
+use crate::data::usb::constants::*;
+use crate::data::usb_midi::usb_midi_event_packet::UsbMidiEventPacket;
 
 //const MIDI_IN_SIZE: u8 = 0x06;
 const MIDI_OUT_SIZE: u8 = 0x09;
@@ -28,6 +29,11 @@ impl<B: UsbBus> MidiClass<'_, B> {
         }
     }
 
+    pub fn send_message(&mut self, usb_midi:UsbMidiEventPacket) -> Result<usize> {
+        let bytes : [u8;4] = usb_midi.into();
+        self.standard_bulkin.write(&bytes)
+    }
+
     pub fn note_on(&mut self, chan: u8, note: Note, vel : u8) -> Result<usize> {
         let note = note as u8;
         self.standard_bulkin.write(

src/util/mod.rs

@@ -0,0 +1 @@
+pub mod try_from;

src/util/try_from.rs

@@ -0,0 +1,6 @@
+
+/// A version of try from that works on options
+/// useful for the bounded ints
+pub trait TryFrom<T> : Sized{
+    fn try_from(value:T) -> Option<Self>;
+}