添加一些关于midi播放的项目

Midi/music-box-arduino-master/PlayerAsm.S

@@ -0,0 +1,73 @@
+#include "Player.h"
+#include "AsmCommon.h"
+
+.globl PlayNoteTimingCheck
+.globl PlayUpdateNextScoreTick
+
+.text
+PlayNoteTimingCheck:
+;if((currentTick>>8)>=player->lastScoreTick)
+movw zl,arg0l
+cli
+lds t0l,(currentTick+1)
+ldd t0h,Z+pLastScoreTick_b0
+cp t0l,t0h
+lds t0l,(currentTick+2)
+ldd t0h,Z+pLastScoreTick_b1
+cpc t0l,t0h
+lds t0l,(currentTick+3)
+ldd t0h,Z+pLastScoreTick_b2
+cpc t0l,t0h
+sei
+clr arg0l
+brlo playNoteTimingCheckEnd
+com arg0l
+playNoteTimingCheckEnd:
+    ret
+
+PlayUpdateNextScoreTick:
+;         ;    tempU32=player->lastScoreTick;
+;         ;     do
+;         ;    {
+;         ;        temp=*(player->scorePointer);
+;         ;        player->scorePointer++;
+;         ;        tempU32+=temp;
+;         ;    } while (temp==0xFF);
+;         ;    player->lastScoreTick=tempU32;
+push yl
+push yh
+movw yl,arg0l
+varTickAccumulateLoop:
+ldd t0l,Y+pScorePointer
+ldd t0h,Y+(pScorePointer+1)
+movw zl,t0l
+lpm t0l,Z
+sec
+adc zl,zero
+adc zh,zero
+std Y+pScorePointer,zl
+std Y+(pScorePointer+1),zh
+
+ldd t0h,Y+pLastScoreTick_b0
+add t0h,t0l
+std Y+pLastScoreTick_b0,t0h
+
+ldd t0h,Y+pLastScoreTick_b1
+adc t0h,zero
+std Y+pLastScoreTick_b1,t0h
+
+ldd t0h,Y+pLastScoreTick_b2
+adc t0h,zero
+std Y+pLastScoreTick_b2,t0h
+
+ldd t0h,Y+pLastScoreTick_b3
+adc t0h,zero
+std Y+pLastScoreTick_b3,t0h
+
+cpi t0l,0xff
+breq varTickAccumulateLoop
+pop yh
+pop yl
+    ret
+.end
+