Basic sysex parser to determine if its mine.

4 files changed, 124 insertions, 1 deletions

diff --git a/libmaple/MidiSpecs.h b/libmaple/MidiSpecs.h
index 008f460..0cc618c 100644
--- a/libmaple/MidiSpecs.h
+++ b/libmaple/MidiSpecs.h
@@ -127,6 +127,13 @@ typedef struct // may need to be adjusted for other compilers and bitfield order
 #define MIDIv1_ACTIVE_SENSE      0xFE /* no data -- CIN_1BYTE */
 #define MIDIv1_RESET             0xFF /* no data -- CIN_1BYTE */
 
+/*
+ * sysex universal id's 
+ */
+#define MIDIv1_UNIVERSAL_REALTIME_ID     0x7F
+#define MIDIv1_UNIVERSAL_NON_REALTIME_ID 0x7E
+#define MIDIv1_UNIVERSAL_ALL_CHANNELS    0x7F
+
 #endif
 
 
diff --git a/libmaple/MinSysex.c b/libmaple/MinSysex.c
index a6af76d..350ebb6 100644
--- a/libmaple/MinSysex.c
+++ b/libmaple/MinSysex.c
@@ -5,11 +5,105 @@
 //  Created by Donald D Davis on 4/11/13.
 //  Copyright (c) 2013 Suspect Devices. All rights reserved.
 //
+/*
+ 0xF0  SysEx
+ 0x7E  Non-Realtime
+ 0x7F  The SysEx channel. Could be from 0x00 to 0x7F.
+ Here we set it to "disregard channel".
+ 0x06  Sub-ID -- General Information
+ 0x01  Sub-ID2 -- Identity Request
+ 0xF7  End of SysEx
+*/ 
 
 #include <libmaple/usb_midi_device.h>
 #include <MinSysex.h>
+#define MAX_SYSEX_SIZE 256
+typedef enum  {NOT_IN_SYSEX=0,IN_SYSEX,COULD_BE_MY_SYSEX,YUP_ITS_MY_SYSEX,ITS_NOT_MY_SYSEX,I_GOT_MY_SYSEX} sysexStates;
+volatile uint8 sysexBuffer[MAX_SYSEX_SIZE];
+volatile sysexStates sysexState;
+volatile int sysexFinger=0;
+void dealWithItQuickly(){
+    ;//turn the led on?
+}
 
 void LglSysexHandler(uint8 *midiBufferRx,uint32 *rx_offset,uint32 *n_unread_bytes) {
+    MIDI_EVENT_PACKET_t * midiPackets = (MIDI_EVENT_PACKET_t *) (midiBufferRx+(*rx_offset));
+    uint8 nPackets=(*n_unread_bytes)-(*rx_offset);
+    int cPacket;
+    /********************************* ACHTUNG! ignores usbmidi cable ********************************/
+    MIDI_EVENT_PACKET_t *packet;
+    for (cPacket=0;cPacket<nPackets;cPacket++){
+        packet=midiPackets+cPacket;
+        if (!CIN_IS_SYSEX(packet->cin)) {
+            continue;
+        } // else {
+        switch (packet->cin) {
+            case CIN_SYSEX:
+                switch (sysexState) {
+                    case NOT_IN_SYSEX : // new sysex.
+                        sysexFinger=0;
+                        if (packet->midi0 == MIDIv1_SYSEX_START) {
+                            if (packet->midi1==MIDIv1_UNIVERSAL_REALTIME_ID
+                                ||packet->midi1==MIDIv1_UNIVERSAL_NON_REALTIME_ID) {
+                                if ((packet->midi2==myMidiChannel)
+                                    ||(packet->midi2==MIDIv1_UNIVERSAL_ALL_CHANNELS)
+                                    ) {
+                                    sysexState=YUP_ITS_MY_SYSEX;
+                                    sysexBuffer[sysexFinger++]=MIDIv1_SYSEX_START;
+                                    sysexBuffer[sysexFinger++]=packet->midi1;
+                                    sysexBuffer[sysexFinger++]=packet->midi2;
+                                    break;
+                                }
+                            } else if ((packet->midi1==myMidiID[0])
+                                       && (packet->midi2==myMidiID[1])
+                                       ){
+                                sysexState=COULD_BE_MY_SYSEX;
+                                sysexBuffer[sysexFinger++]=MIDIv1_SYSEX_START;
+                                sysexBuffer[sysexFinger++]=packet->midi1;
+                                sysexBuffer[sysexFinger++]=packet->midi2;
+                                break;
+                            }
+                        }
+                        break;
+                        
+                    case COULD_BE_MY_SYSEX:
+                        if (packet->midi0==myMidiID[2]) {
+                            sysexState=YUP_ITS_MY_SYSEX;
+                            sysexBuffer[sysexFinger++]=packet->midi0;
+                            sysexBuffer[sysexFinger++]=packet->midi1;
+                            sysexBuffer[sysexFinger++]=packet->midi2;
+                        } else {
+                            sysexState=ITS_NOT_MY_SYSEX;
+                            sysexFinger=0;
+                        }
+                        break;
+                    default:
+                        break;
+                        
+                }
+                
+                break;
+            case CIN_SYSEX_ENDS_IN_1:
+            case CIN_SYSEX_ENDS_IN_2:
+            case CIN_SYSEX_ENDS_IN_3:
+                sysexBuffer[sysexFinger++]=packet->midi0;
+                sysexBuffer[sysexFinger++]=packet->midi1;
+                sysexBuffer[sysexFinger++]=packet->midi2;
+                // sysexState=I_GOT_MY_SYSEX;
+                // flag it or something for retrieval later.
+                dealWithItQuickly();
+                sysexFinger=0;
+                sysexState=NOT_IN_SYSEX;
+
+                break;
+            default:
+                return;
+        }
+        //}
+    
+
+    
+    }
     // its our sysex and we will cry if we want to
     return;
 }
\ No newline at end of file
diff --git a/libmaple/MinSysex.h b/libmaple/MinSysex.h
index 368eaa3..c882d74 100644
--- a/libmaple/MinSysex.h
+++ b/libmaple/MinSysex.h
@@ -5,6 +5,12 @@
 //  Created by Donald D Davis on 4/11/13.
 //  Copyright (c) 2013 Suspect Devices. All rights reserved.
 //
+#ifndef __LETS_MIN_SYSEX_H__
+#define __LETS_MIN_SYSEX_H__ 1
+
+
+#include "MidiSpecs.h"
+
 
 #define LEAFLABS_MMA_VENDOR_1   0x7D
 #define LEAFLABS_MMA_VENDOR_2   0x1E
@@ -14,4 +20,13 @@
 #define DEFAULT_MIDI_DEVICE     0x0A
 #define DEFAULT_MIDI_CABLE      0x00
 
-void LglSysexHandler(uint8 *midiBufferRx,uint32 *rx_offset,uint32 *n_unread_bytes);
\ No newline at end of file
+// eventually all of this should be in a place for settings which can be written to flash.
+extern volatile uint8 myMidiChannel;
+extern volatile uint8 myMidiDevice;
+extern volatile uint8 myMidiCable;
+extern volatile uint8 myMidiID[];
+
+
+void LglSysexHandler(uint8 *midiBufferRx,uint32 *rx_offset,uint32 *n_unread_bytes);
+
+#endif
\ No newline at end of file
diff --git a/libmaple/usb/stm32f1/usb_midi_device.c b/libmaple/usb/stm32f1/usb_midi_device.c
index efc7a9d..c38bbf1 100644
--- a/libmaple/usb/stm32f1/usb_midi_device.c
+++ b/libmaple/usb/stm32f1/usb_midi_device.c
@@ -350,6 +350,13 @@ static volatile uint8 transmitting = 0;
 /* Number of unread bytes */
 static volatile uint32 n_unread_bytes = 0;
 
+
+// eventually all of this should be in a place for settings which can be written to flash.
+volatile uint8 myMidiChannel = DEFAULT_MIDI_CHANNEL;
+volatile uint8 myMidiDevice = DEFAULT_MIDI_DEVICE;
+volatile uint8 myMidiCable = DEFAULT_MIDI_CABLE;
+volatile uint8 myMidiID[] = { LEAFLABS_MMA_VENDOR_1,LEAFLABS_MMA_VENDOR_2,LEAFLABS_MMA_VENDOR_3,0};
+
 /*
  * Endpoint callbacks
  */