添加一些关于midi播放的项目

Midi/music-box-stm32f1-master/user/Player.c

@@ -0,0 +1,82 @@
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include "SynthCore.h"
+#include "Player.h"
+
+extern unsigned char Score[];
+
+void Player32kProc(Player *player)
+{
+    SynthAsm(&(player->mainSynthesizer));
+    player->currentTick++;
+    if(player->decayGenTick<200)
+         player->decayGenTick+=1;
+}
+
+void PlayerProcess(Player *player)
+{
+
+    uint8_t temp;
+
+    if (player->decayGenTick >= 150)
+    {
+        GenDecayEnvlopeAsm(&(player->mainSynthesizer));
+        player->decayGenTick = 0;
+    }
+    if (player->status == STATUS_PLAYING)
+    {
+        if ((player->currentTick >> 8) >= player->lastScoreTick)
+        {
+            do
+            {
+                temp = *(player->scorePointer);
+                player->scorePointer++;
+                if (temp == 0xFF)
+                {
+                    player->status = STATUS_STOP;
+                }
+                else
+                {
+                    NoteOnAsm(&(player->mainSynthesizer), temp);
+                }
+            } while ((temp & 0x80) == 0);
+            
+            PlayUpdateNextScoreTick(player);
+        }
+    }
+}
+
+void PlayUpdateNextScoreTick(Player *player)
+{
+    uint32_t tempU32;
+    uint8_t temp;
+    tempU32 = player->lastScoreTick;
+    do
+    {
+        temp = *(player->scorePointer);
+        player->scorePointer++;
+        tempU32 += temp;
+    } while (temp == 0xFF);
+    player->lastScoreTick = tempU32;
+}
+
+void PlayerPlay(Player *player)
+{
+    player->currentTick = 0;
+    player->lastScoreTick = 0;
+    player->decayGenTick = 0;
+    player->scorePointer = Score;
+    PlayUpdateNextScoreTick(player);
+    player->status = STATUS_PLAYING;
+}
+
+void PlayerInit(Player *player)
+{
+    player->status = STATUS_STOP;
+    player->currentTick = 0;
+    player->lastScoreTick = 0;
+    player->decayGenTick = 0;
+    player->scorePointer = Score;
+    SynthInit(&(player->mainSynthesizer));
+}