Basic sysex parser to determine if its mine.

1 files changed, 94 insertions, 0 deletions

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