Diff: MIDI_Proc/midi_proc.c

Revision:

5:7d7be4c72d21

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MIDI_Proc/midi_proc.c	Mon Aug 11 07:46:03 2014 +0000
@@ -0,0 +1,143 @@
+#include "midi_proc.h"
+
+using namespace mbed;
+
+MN_t NoteEnd = { 255, 255, 15, 0 };
+MN_t NoteStart = { 0, 0, 0, &NoteEnd };
+MN_t MidiNotes[POLYPHONICE_NOTES];
+static uint16_t MidiNotesTag;
+volatile static uint8_t NumOfNotes = POLYPHONICE_NOTES;
+
+MIDI midi(dp16, dp15);
+
+void midi_init(void)
+{
+    midi.setHandleNoteOff(&midi_noteoff);
+    midi.setHandleNoteOn(&midi_noteon);
+    midi.setHandleControlChange(&midi_cc);
+    midi.setHandleProgramChange(&midi_pc);
+    midi.setHandlePitchBend(&midi_pbend);
+    midi.setHandleSystemReset(&midi_sysreset);
+}   
+
+/// @brief  Reset all MIDI controller
+static void midi_allnoteoff(void)
+{
+    int i;
+    uint16_t msk;
+
+    for (i = 0, msk = 0x01; i < NumOfNotes; i++, msk<<=1) {
+        if (MidiNotesTag & msk) {
+            midi.sendNoteOff(MidiNotes[i].Note, MidiNotes[i].Velocity, MidiNotes[i].Channel);
+            MidiNotesTag &= ~msk;
+        }
+    }
+
+    MidiNotesTag = 0x0000;
+    NoteEnd.next = NULL;
+    NoteStart.next = &NoteEnd;
+}
+
+/// @brief  Reset MIDI controller
+static void midi_resetcontrol(void)
+{
+}
+
+/// @brief  Reset all MIDI controller
+void midi_sysreset(void)
+{
+    midi_allnoteoff();
+    midi_resetcontrol();
+}
+
+/// @brief  MIDI note structure allocate function
+static MN_p allocN(void) {
+    int i;
+    uint16_t msk;
+
+    for (i = 0, msk = 0x01; i < NumOfNotes; i++, msk<<=1) {
+        if (!(MidiNotesTag & msk)) {
+            MidiNotesTag |= msk;
+            MidiNotes[i].Channel = i;
+            return (&MidiNotes[i]);
+        }
+    }
+    return NULL;
+}
+
+/// @brief  MIDI note structure free function
+static void freeN(MN_p addr)
+{
+    int i;
+    uint16_t msk;
+
+    for (i = 0, msk = 0x01; i < NumOfNotes; i++, msk<<=1) {
+        if (addr == &MidiNotes[i])
+            MidiNotesTag &= ~msk;
+    }
+}
+
+/// @brief  MIDI Control Change callback funcion
+void midi_cc(byte channel, byte number, byte value)
+{
+    if (number == MIDI_ALL_NOTE_OFF) {
+        midi_allnoteoff();
+    }
+    if (number == MIDI_RESET_ALL_CONTROLLERS) {
+        midi_resetcontrol();
+    }
+    midi.sendControlChange(number, value, channel);
+}
+
+/// @brief  MIDI Program Change callback funcion
+void midi_pc(byte channel, byte number)
+{
+    midi.sendProgramChange(number, channel);
+}
+
+/// @brief  MIDI Pitch Bend callback funcion
+void midi_pbend(byte channel, int bend)
+{
+    midi.sendPitchBend(bend, channel);
+}
+
+/// @brief  MIDI Note On callback funcion
+void midi_noteon(byte channel, byte note, byte velocity)
+{
+    MN_p ptr, newnote;
+
+    if ((newnote = allocN()) == NULL) { // if table full, release oldest note
+        ptr = NoteStart.next;
+        midi.sendNoteOff(ptr->Note, ptr->Velocity, ptr->Channel);
+        NoteStart.next = ptr->next;
+        freeN(ptr);
+        newnote = allocN();
+    }
+    newnote->Note = note;
+    newnote->Velocity = velocity;
+    // newnote->Channel // do not set channel
+    midi.sendNoteOn(note, velocity, newnote->Channel);
+    for (ptr = &NoteStart; ptr->next; ptr = ptr->next) {    // put newnote on the tail
+        if (ptr->next == &NoteEnd) {
+            newnote->next = ptr->next;
+            ptr->next = newnote;
+            break;
+        }
+    }
+}
+
+/// @brief  MIDI Note Off callback funcion
+void midi_noteoff(byte channel, byte note, byte velocity)
+{
+    MN_p ptr, lastptr;
+
+    for (ptr = &NoteStart; ptr->next; ptr = ptr->next) {
+        if (note == ptr->next->Note) {
+            lastptr = ptr->next;
+            midi.sendNoteOff(lastptr->Note, lastptr->Velocity, lastptr->Channel);
+            ptr->next = lastptr->next;
+            freeN(lastptr);
+            break;
+        }
+    }
+}