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keil里面的单片机C语言程序缺少返回值，求帮助

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ID:796812 发表于 2020-7-7 22:59 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
50黑币
  1. #include<reg52.h>
  2. #define uchar unsigned char
  3. #define uint unsigned int
  4. #define  LCDPORT P0
  5. uchar code tab[]="Press key";
  6. uchar code tab1[]="Select song";
  7. uchar code tab2[]="First Song" ;
  8. uchar code tab3[]="butterfly";
  9. uchar code tab4[]="Second Song" ;
  10. uchar code tab5[]="Jingle bell ";
  11. uchar code tab6[]="Third Song" ;
  12. uchar code tab7[]="Yesterday";
  13. uchar code tab8[]="Forth Song" ;
  14. uchar code tab9[]="Youth League";
  15. sbit LCDE=P2^2;
  16. sbit LCDRW=P2^1;
  17. sbit LCDRS=P2^0;
  18. #define SYSTEM_OSC   12000000 //定义晶振频率12000000HZ
  19. #define SOUND_SPACE  4/5   //定义普通音符演奏的长度分率,//每4分音符间隔
  20. sbit    BeepIO    =    P3^7;  //定义输出管脚
  21. sbit K1=P1^7;
  22. unsigned int  code FreTab[12]  = { 262,277,294,311,330,349,369,392,415,440,466,494 }; //原始频率表
  23. unsigned char code SignTab[7]  = { 0,2,4,5,7,9,11 };           //1~7在频率表中的位置
  24. unsigned char code LengthTab[7]= { 1,2,4,8,16,32,64 };      
  25. unsigned char Sound_Temp_TH0,Sound_Temp_TL0; //音符定时器初值暂存
  26. unsigned char Sound_Temp_TH1,Sound_Temp_TL1;
  27. unsigned char code Music_Girl[]=
  28. { 0x0F,0x01, 0x15,0x02, 0x16,0x02, 0x17,0x66, 0x18,0x03,
  29.   0x17,0x02, 0x15,0x02, 0x16,0x01, 0x15,0x02, 0x10,0x02,
  30.   0x15,0x00, 0x0F,0x01, 0x15,0x02, 0x16,0x02, 0x17,0x02,
  31.   0x17,0x03, 0x18,0x03, 0x19,0x02, 0x15,0x02, 0x18,0x66,
  32.   0x17,0x03, 0x19,0x02, 0x16,0x03, 0x17,0x03, 0x16,0x00,
  33.   0x17,0x01, 0x19,0x02, 0x1B,0x02, 0x1B,0x70, 0x1A,0x03,
  34.   0x1A,0x01, 0x19,0x02, 0x19,0x03, 0x1A,0x03, 0x1B,0x02,
  35.   0x1A,0x0D, 0x19,0x03, 0x17,0x00, 0x18,0x66, 0x18,0x03,
  36.   0x19,0x02, 0x1A,0x02, 0x19,0x0C, 0x18,0x0D, 0x17,0x03,
  37.   0x16,0x01, 0x11,0x02, 0x11,0x03, 0x10,0x03, 0x0F,0x0C,
  38.   0x10,0x02, 0x15,0x00, 0x1F,0x01, 0x1A,0x01, 0x18,0x66,
  39.   0x19,0x03, 0x1A,0x01, 0x1B,0x02, 0x1B,0x03, 0x1B,0x03,
  40.   0x1B,0x0C, 0x1A,0x0D, 0x19,0x03, 0x17,0x00, 0x1F,0x01,
  41.   0x1A,0x01, 0x18,0x66, 0x19,0x03, 0x1A,0x01, 0x10,0x02,
  42.   0x10,0x03, 0x10,0x03, 0x1A,0x0C, 0x18,0x0D, 0x17,0x03,
  43.   0x16,0x00, 0x0F,0x01, 0x15,0x02, 0x16,0x02, 0x17,0x70,
  44.   0x18,0x03, 0x17,0x02, 0x15,0x03, 0x15,0x03, 0x16,0x66,
  45.   0x16,0x03, 0x16,0x02, 0x16,0x03, 0x15,0x03, 0x10,0x02,
  46.   0x10,0x01, 0x11,0x01, 0x11,0x66, 0x10,0x03, 0x0F,0x0C,
  47.   0x1A,0x02, 0x19,0x02, 0x16,0x03, 0x16,0x03, 0x18,0x66,
  48.   0x18,0x03, 0x18,0x02, 0x17,0x03, 0x16,0x03, 0x19,0x00,
  49.   0x00,0x00};
  50. unsigned char code Music_Jingle[]={
  51. 0x0F,0x03, 0x0F,0x03, 0x17,0x03, 0x16,0x03, 0x15,0x03,
  52. 0x0F,0x66, 0x19,0x04, 0x19,0x04, 0x0F,0x03, 0x17,0x03,
  53. 0x16,0x03, 0x15,0x03, 0x10,0x02, 0x10,0x03, 0x10,0x03,
  54. 0x18,0x03, 0x17,0x03, 0x16,0x03, 0x10,0x66, 0x10,0x03,
  55. 0x19,0x03, 0x19,0x03, 0x18,0x03, 0x16,0x03, 0x17,0x02,
  56. 0x15,0x03, 0x0F,0x03, 0x0F,0x03, 0x17,0x03, 0x16,0x03,
  57. 0x15,0x03, 0x0F,0x66, 0x0F,0x03, 0x0F,0x03, 0x17,0x03,
  58. 0x16,0x03, 0x15,0x03, 0x10,0x66, 0x10,0x03, 0x10,0x03,
  59. 0x18,0x03, 0x17,0x03, 0x16,0x03, 0x19,0x03, 0x19,0x03,
  60. 0x19,0x03, 0x19,0x03, 0x1A,0x03, 0x19,0x03, 0x18,0x03,
  61. 0x16,0x03, 0x15,0x66, 0x17,0x03, 0x17,0x03, 0x17,0x02,
  62. 0x17,0x03, 0x17,0x03, 0x17,0x02, 0x17,0x03, 0x19,0x03,
  63. 0x15,0x03, 0x16,0x03, 0x17,0x01, 0x18,0x03, 0x18,0x03,
  64. 0x18,0x67, 0x18,0x04, 0x18,0x03, 0x17,0x03, 0x17,0x03,
  65. 0x17,0x04, 0x17,0x04, 0x17,0x03, 0x16,0x03, 0x16,0x03,
  66. 0x15,0x03, 0x16,0x03, 0x19,0x66, 0x19,0x03, 0x19,0x03,
  67. 0x18,0x03, 0x16,0x03, 0x15,0x02, 0x00,0x00  };
  68. unsigned char code Music_Two[] ={
  69. 0x17,0x03, 0x16,0x03, 0x17,0x01, 0x16,0x03, 0x17,0x03,
  70. 0x16,0x03, 0x15,0x01, 0x10,0x03, 0x15,0x03, 0x16,0x02,
  71. 0x16,0x0D, 0x17,0x03, 0x16,0x03, 0x15,0x03, 0x10,0x03,
  72. 0x10,0x0E, 0x15,0x04, 0x0F,0x01, 0x17,0x03, 0x16,0x03,
  73. 0x17,0x01, 0x16,0x03, 0x17,0x03, 0x16,0x03, 0x15,0x01,
  74. 0x10,0x03, 0x15,0x03, 0x16,0x02, 0x16,0x0D, 0x17,0x03,
  75. 0x16,0x03, 0x15,0x03, 0x10,0x03, 0x15,0x03, 0x16,0x01,
  76. 0x17,0x03, 0x16,0x03, 0x17,0x01, 0x16,0x03, 0x17,0x03,
  77. 0x16,0x03, 0x15,0x01, 0x10,0x03, 0x15,0x03, 0x16,0x02,
  78. 0x16,0x0D, 0x17,0x03, 0x16,0x03, 0x15,0x03, 0x10,0x03,
  79. 0x10,0x0E, 0x15,0x04, 0x0F,0x01, 0x17,0x03, 0x19,0x03,
  80. 0x19,0x01, 0x19,0x03, 0x1A,0x03, 0x19,0x03, 0x17,0x01,
  81. 0x16,0x03, 0x16,0x03, 0x16,0x02, 0x16,0x0D, 0x17,0x03,
  82. 0x16,0x03, 0x15,0x03, 0x10,0x03, 0x10,0x0D, 0x15,0x00,
  83. 0x19,0x03, 0x19,0x03, 0x1A,0x03, 0x1F,0x03, 0x1B,0x03,
  84. 0x1B,0x03, 0x1A,0x03, 0x17,0x0D, 0x16,0x03, 0x16,0x03,
  85. 0x16,0x0D, 0x17,0x01, 0x17,0x03, 0x17,0x03, 0x19,0x03,
  86. 0x1A,0x02, 0x1A,0x02, 0x10,0x03, 0x17,0x0D, 0x16,0x03,
  87. 0x16,0x01, 0x17,0x03, 0x19,0x03, 0x19,0x03, 0x17,0x03,
  88. 0x19,0x02, 0x1F,0x02, 0x1B,0x03, 0x1A,0x03, 0x1A,0x0E,
  89. 0x1B,0x04, 0x17,0x02, 0x1A,0x03, 0x1A,0x03, 0x1A,0x0E,
  90. 0x1B,0x04, 0x1A,0x03, 0x19,0x03, 0x17,0x03, 0x16,0x03,
  91. 0x17,0x0D, 0x16,0x03, 0x17,0x03, 0x19,0x01, 0x19,0x03,
  92. 0x19,0x03, 0x1A,0x03, 0x1F,0x03, 0x1B,0x03, 0x1B,0x03,
  93. 0x1A,0x03, 0x17,0x0D, 0x16,0x03, 0x16,0x03, 0x16,0x03,
  94. 0x17,0x01, 0x17,0x03, 0x17,0x03, 0x19,0x03, 0x1A,0x02,
  95. 0x1A,0x02, 0x10,0x03, 0x17,0x0D, 0x16,0x03, 0x16,0x01,
  96. 0x17,0x03, 0x19,0x03, 0x19,0x03, 0x17,0x03, 0x19,0x03,
  97. 0x1F,0x02, 0x1B,0x03, 0x1A,0x03, 0x1A,0x0E, 0x1B,0x04,
  98. 0x17,0x02, 0x1A,0x03, 0x1A,0x03, 0x1A,0x0E, 0x1B,0x04,
  99. 0x17,0x16, 0x1A,0x03, 0x1A,0x03, 0x1A,0x0E, 0x1B,0x04,
  100. 0x1A,0x03, 0x19,0x03, 0x17,0x03, 0x16,0x03, 0x0F,0x02,
  101. 0x10,0x03, 0x15,0x00, 0x00,0x00 };
  102. unsigned char code Music_Yesterday[]={
  103. 0x15,0x03, 0x15,0x03, 0x16,0x03, 0x17,0x02, 0x19,0x02,
  104. 0x19,0x03, 0x17,0x03, 0x19,0x03, 0x17,0x03, 0x1A,0x02,
  105. 0x19,0x66, 0x17,0x02, 0x17,0x03, 0x19,0x03, 0x1A,0x02,
  106. 0x16,0x02, 0x17,0x03, 0x19,0x02, 0x1A,0x15, 0x17,0x03,
  107. 0x19,0x03, 0x1A,0x02, 0x21,0x02, 0x20,0x03, 0x1F,0x02,
  108. 0x1B,0x03, 0x1B,0x66, 0x19,0x03, 0x17,0x03, 0x19,0x02,
  109. 0x17,0x02, 0x16,0x14, 0x15,0x03, 0x15,0x03, 0x16,0x03,
  110. 0x17,0x03, 0x19,0x02, 0x19,0x03, 0x19,0x03, 0x17,0x03,
  111. 0x19,0x03, 0x17,0x03, 0x1A,0x03, 0x19,0x02, 0x17,0x03,
  112. 0x17,0x02, 0x17,0x03, 0x19,0x03, 0x1A,0x02, 0x1B,0x02,
  113. 0x17,0x03, 0x19,0x02, 0x1A,0x03, 0x1A,0x01, 0x1B,0x02,
  114. 0x20,0x02, 0x1F,0x03, 0x1B,0x03, 0x1A,0x66, 0x1B,0x03,
  115. 0x1F,0x03, 0x1B,0x03, 0x1F,0x03, 0x1B,0x02, 0x1A,0x66,
  116. 0x1A,0x03, 0x1B,0x03, 0x1F,0x02, 0x1F,0x02, 0x1A,0x03,
  117. 0x1F,0x02, 0x20,0x03, 0x20,0x16, 0x1F,0x02, 0x20,0x02,
  118. 0x21,0x03, 0x21,0x03, 0x21,0x03, 0x21,0x02, 0x20,0x03,
  119. 0x1F,0x03, 0x1B,0x03, 0x1F,0x03, 0x1B,0x03, 0x1A,0x66,
  120. 0x17,0x03, 0x19,0x03, 0x19,0x14, 0x1F,0x03, 0x20,0x03,
  121. 0x21,0x03, 0x21,0x03, 0x21,0x03, 0x21,0x03, 0x21,0x02,
  122. 0x20,0x03, 0x1F,0x03, 0x1F,0x03, 0x1B,0x03, 0x1A,0x66,
  123. 0x17,0x03, 0x19,0x03, 0x19,0x14, 0x1A,0x03, 0x1B,0x03,
  124. 0x1F,0x03, 0x1B,0x03, 0x1F,0x03, 0x1B,0x03, 0x1F,0x03,
  125. 0x20,0x66, 0x1F,0x03, 0x1B,0x03, 0x1F,0x03, 0x1B,0x02,
  126. 0x1F,0x03, 0x20,0x66, 0x1F,0x03, 0x20,0x03, 0x21,0x02,
  127. 0x21,0x02, 0x20,0x03, 0x1F,0x02, 0x1A,0x03, 0x1A,0x02,
  128. 0x17,0x02, 0x17,0x03, 0x1A,0x03, 0x17,0x03, 0x19,0x03,
  129. 0x19,0x14, 0x17,0x03, 0x17,0x03, 0x16,0x04, 0x15,0x04,
  130. 0x15,0x03, 0x16,0x03, 0x17,0x01, 0x17,0x03, 0x18,0x02,
  131. 0x16,0x03, 0x16,0x14, 0x17,0x03, 0x17,0x03, 0x17,0x03,
  132. 0x18,0x02, 0x16,0x03, 0x16,0x16, 0x15,0x03, 0x16,0x03,
  133. 0x17,0x03, 0x16,0x01, 0x1F,0x02, 0x20,0x02, 0x21,0x03,
  134. 0x21,0x03, 0x21,0x03, 0x21,0x02, 0x20,0x03, 0x1F,0x03,
  135. 0x1B,0x03, 0x1F,0x03, 0x1B,0x03, 0x1A,0x03, 0x1A,0x02,
  136. 0x17,0x03, 0x19,0x03, 0x19,0x14, 0x1F,0x02, 0x20,0x02,
  137. 0x21,0x03, 0x21,0x03, 0x21,0x03, 0x21,0x66, 0x20,0x03,
  138. 0x1F,0x03, 0x1B,0x03, 0x1F,0x03, 0x1B,0x03, 0x1A,0x66,
  139. 0x17,0x03, 0x19,0x03, 0x19,0x00, 0x00,0x00 };

  141. uchar k;
  142. void delay1(void) //延时程序
  143. {
  144. uchar i,j;
  145. for(i=20;i>0;i--)
  146. for(j=248;j>0;j--);
  147. }
  148. void Getch (  )
  149. {   uchar X,Y,Z;
  150. P1=0xff;
  151. P1=0xf3;       //先对P0置数  行扫描
  152. if(P1!=0xf3)     //判断是否有键按下
  153.   { delay1();    //延时,软件去干扰
  154.     if(P1!=0xf3)   //确认按键按下X = P3;
  155.      {
  156.     X=P1;          //保存行扫描时有键按下时状态
  157.     P1=0xfc;       //列扫描
  158.     Y=P1;          //保存列扫描时有键按下时状态
  159.      Z=X|Y;
  160.         //取出键值
  161.     switch ( Z )   //判断键值（那一个键按下）
  162.     {
  163.      case 0xf9: k=0; break; //对键值赋值
  164.      case 0xf5: k=1; break;
  165.      case 0xfa: k=2; break;
  166.      case 0xf6: k=3; break;
  167.             
  168.     }
  169.      }
  170.   }
  171. }   
  172. void Delay()
  173. {  uint uiCount;
  174.   for(uiCount=0;uiCount<250;uiCount++);
  175. }
  176. void WriteCMD(uchar Commond)//LCD写指令函数      
  177. {
  178. Delay();    //先延时。
  179. LCDE=1;     //然后把ＬＣＤ改为写入命令状态。
  180. LCDRS=0;
  181. LCDRW=0;
  182. LCDPORT=Commond;  //再输出命令。
  183. LCDE=0;     //最后执行命令。
  184. }
  185. void WriteData(uchar dat)//ＬＣＤ写数据函数      
  186. { Delay();      //先延时。
  187. LCDE=1;       //然后把ＬＣＤ改为写入数据状态。
  188. LCDRS=1;
  189. LCDRW=0;
  190. LCDPORT=dat;     //再输出数据。
  191. LCDE=0;       //最后显示数据。
  192. }
  193. void init()
  194. {
  195.   LCDRW=0;
  196.     LCDE=0;
  197.    WriteCMD(0x38);
  198.   WriteCMD(0x0c);
  199.   WriteCMD(0x06);
  200.   WriteCMD(0x01);
  201.   WriteCMD(0x80);
  202. }
  203. void mydelay(int x)
  204. { int i,j;
  205. for(i=x;i>0;i--)
  206. for(j=255;j>0;j--);
  207. }
  208. void InitialSound(void)
  209. {
  210. BeepIO = 0;
  211. Sound_Temp_TH1 = (65535-(1/1200)*SYSTEM_OSC)/256; // 计算TL1应装入的初值  (10ms的初装值)
  212. Sound_Temp_TL1 = (65535-(1/1200)*SYSTEM_OSC)%256; // 计算TH1应装入的初值
  213. TH1 = Sound_Temp_TH1;
  214. TL1 = Sound_Temp_TL1;
  215. TMOD  |= 0x11;
  216. ET0    = 1;
  217. ET1    = 0;
  218. TR0    = 0;
  219. TR1    = 0;
  220. EA     = 1;
  221. }
  222. void BeepTimer0(void) interrupt 1 //音符发生中断
  223. {
  224. BeepIO = !BeepIO;
  225. TH0    = Sound_Temp_TH0;
  226.   TL0    = Sound_Temp_TL0;
  227. }
  228.    void Play(unsigned char *Sound,unsigned char Signature,unsigned Octachord,unsigned int Speed)
  229. {
  230. unsigned int NewFreTab[12];  //新的频率表
  231. unsigned char i,j;
  232. unsigned int Point,LDiv,LDiv0,LDiv1,LDiv2,LDiv4,CurrentFre,Temp_T,SoundLength;
  233. unsigned char Tone,Length,SL,SH,SM,SLen,XG,FD;
  234. for(i=0;i<12;i++)     // 根据调号及升降八度来生成新的频率表
  235. {
  236.   j = i + Signature;
  237.   if(j > 11)
  238.   {
  239.    j = j-12;
  240.    NewFreTab[i] = FreTab[j]*2;
  241.   }
  242.   else
  243.    NewFreTab[i] = FreTab[j];
  244.   if(Octachord == 1)
  245.    NewFreTab[i]>>=2;
  246.   else if(Octachord == 3)
  247.    NewFreTab[i]<<=2;
  248. }         

  250. SoundLength = 0;
  251. while(Sound[SoundLength] != 0x00) //计算歌曲长度
  252. {
  253.   SoundLength+=2;
  254. }
  255. Point = 0;
  256. Tone   = Sound[Point];
  257. Length = Sound[Point+1];    // 读出第一个音符和它时时值

  259. LDiv0 = 12000/Speed;    // 算出1分音符的长度(几个10ms)  
  260. LDiv4 = LDiv0/4;       // 算出4分音符的长度
  261. LDiv4 = LDiv4-LDiv4*SOUND_SPACE;  // 普通音最长间隔标准
  262. TR0   = 0;
  263. TR1   = 1;
  264. while(Point < SoundLength&&K1==1)  //歌曲代码未放完且暂停键未被按下
  265. {
  266.   SL=Tone%10;         //计算出音符
  267.   SM=Tone/10%10;         //计算出高低音
  268.   SH=Tone/100;         //计算出是否升半
  269.   CurrentFre = NewFreTab[SignTab[SL-1]+SH];   //查出对应音符的频率  
  270.   if(SL!=0)
  271.   {
  272.    if (SM==1) CurrentFre >>= 2;     //低音
  273.    if (SM==3) CurrentFre <<= 2;     //高音
  274.    Temp_T = 65536-(50000/CurrentFre)*10/(12000000/SYSTEM_OSC);//计算计数器初值
  275.    Sound_Temp_TH0 = Temp_T/256;
  276.    Sound_Temp_TL0 = Temp_T%256;
  277.    TH0 = Sound_Temp_TH0;  
  278.    TL0 = Sound_Temp_TL0 + 12; //加12是对中断延时的补偿
  279.   }
  280.   SLen=LengthTab[Length%10];   //算出是几分音符
  281.   XG=Length/10%10;     //算出音符类型(0普通1连音2顿音)
  282.   FD=Length/100;
  283.   LDiv=LDiv0/SLen;     //算出连音音符演奏的长度(多少个10ms)
  284.   if (FD==1)
  285.    LDiv=LDiv+LDiv/2;
  286.   if(XG!=1)
  287.    if(XG==0)      //算出普通音符的演奏长度
  288.     if (SLen<=4)
  289.      LDiv1=LDiv-LDiv4;
  290.     else
  291.      LDiv1=LDiv*SOUND_SPACE;
  292.    else
  293.     LDiv1=LDiv/2;    //算出顿音的演奏长度
  294.   else
  295.    LDiv1=LDiv;
  296.   if(SL==0) LDiv1=0;
  297.    LDiv2=LDiv-LDiv1;    //算出不发音的长度
  298.     if (SL!=0)
  299.   {
  300.    TR0=1;
  301.    for(i=LDiv1;i>0;i--)    //发规定长度的音
  302.    {
  303.     while(TF1==0);
  304.     TH1 = Sound_Temp_TH1;
  305.     TL1 = Sound_Temp_TL1;
  306.     TF1=0;
  307.    }
  308.   }
  309.   if(LDiv2!=0)
  310.   {
  311.    TR0=0; BeepIO=0;
  312.    for(i=LDiv2;i>0;i--)    //音符间的间隔
  313.    {
  314.     while(TF1==0);
  315.     TH1 = Sound_Temp_TH1;
  316.     TL1 = Sound_Temp_TL1;
  317.     TF1=0;
  318.    }
  319.   }
  320.   Point+=2;
  321.   Tone=Sound[Point];
  322.   Length=Sound[Point+1];
  323. }
  324. BeepIO = 0;
  325. }
  326. main()
  327. { uint i;
  328. k=8;
  329. init();
  330.    for(i=0;i<15;i++)
  331.      {
  332.       WriteData(tab[i]);       //LCD写数据函数写第一行
  333.         mydelay(50);
  334.   }
  335.       mydelay(1000);
  336.       WriteCMD(0x80+0x40+2);     //将指针设到第二行空两字符
  337.       for(i=0;i<6;i++)
  338.        {
  339.            WriteData(tab1[i]);
  340.           mydelay(50);
  341.        }
  342.    InitialSound();         //发音初始化程序
  343.    while(1)
  344.     {  Getch();        //扫描键盘，获得键值
  345.       if(k==0)        //若键值为0
  346.         { uint i;
  347.          init();
  348.               for(i=0;i<10;i++)
  349.            {
  350.           WriteData(tab2[i]);    //写第一首歌序号
  351.             mydelay(50);
  352.            }
  353.          mydelay(1000);
  354.          WriteCMD(0x80+0x40);   //转到第二行
  355.          for(i=0;i<9;i++)
  356.          { WriteData(tab3[i]);    //写歌名
  357.             mydelay(50);
  358.          }
  359.        Play(Music_Girl,0,3,360);   //播放第一首歌
  360.        mydelay(500);
  361.       break;
  362.        }
  363.       else if (k==1)        //若键值为1
  364.       { uint i;
  365.          init();
  366.             for(i=0;i<11;i++)
  367.             { WriteData(tab4[i]);   //写第二首歌序号
  368.              mydelay(50);
  369.             }
  370.            mydelay(1000);
  371.            WriteCMD(0x80+0x40);  //转到第二行
  372.            for(i=0;i<11;i++)
  373.           {
  374.               WriteData(tab5[i]);   //写歌名
  375.              mydelay(50);
  376.           }
  377.         Play(Music_Jingle,0,3,360); //播放第二首歌
  378.         mydelay(500);
  379.         break;
  380.       }
  381.       else if (k==2) //若键值为2
  382.       { uint i;
  383.          init();
  384.          for(i=0;i<10;i++)
  385.             { WriteData(tab6[i]);   //写第三首歌序号
  386.              mydelay(50);
  387.             }
  388.           mydelay(1000);
  389.           //WriteCMD(0x01);
  390.           WriteCMD(0x80+0x40);   //转到第二行
  391.           for(i=0;i<6;i++)
  392.           {
  393.               WriteData(tab7[i]);   //写歌名
  394.              mydelay(50);
  395.           }
  396.        Play(Music_Two,0,3,360);   //播放第三首歌
  397.        mydelay(500);
  398.        break;
  399.        }
  400.      else if (k==3) //若键值为3
  401.       { uint i;
  402.          init();
  403.             for(i=0;i<10;i++)
  404.             { WriteData(tab8[i]);   //写第四首歌序号
  405.              mydelay(50);
  406.             }
  407.           mydelay(1000);
  408.        WriteCMD(0x80+0x40);   //转到第二行
  409.           for(i=0;i<6;i++)
  410.           { WriteData(tab9[i]);   //写歌名
  411.              mydelay(50);
  412.           }
  413.          Play(Music_Jingle,0,3,360);  //播放第三首歌
  414.         mydelay(500);
  415.         break;
  416.       }
  417.      }
  418. }
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沙发
ID:328014 发表于 2020-7-8 15:47 | 只看该作者
哪个函数缺少返回值?
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