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发一个PCF8574A I2C接口的1602程序.欢迎各路大侠指点

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ID:105672发表于 2016-2-18 14:41|只看该作者回帖奖励
拆了一台点钞机,主控板是用STC的12C5A16AD,正好手有块I2C的LCD1602.无聊就搞搞实验,用定时器做了个时钟.
  1. #include< STC15F104E.H>
  2. #include< intrins.h>
  3. sbit SDA=P0^2;    
  4. sbit SCL=P0^1;

  6. bit ack,blk;       //I2C 应答位  LCD背光开关

  8. #define uchar unsigned char                                  
  9.                                                                                     
  10.                                                                                     
  11. uchar num[]={"0123456789"},sec,min,hou;
  12. unsigned int us,ms;





  18. #define WriteAdd     0x7e         //写PCF8574A地址 0111 A2 A2 A0 W
  19. #define ReadAdd     0x7f           //读PCF8574A地址 0111 A2 A2 A0 R
  20.                                                                          //             背光   CS/EN  R/W  RS
  21.                          //P7 P6 P5 P4 P3 P2     P1   P0  PCF8574A引脚
  22. //#define WriteCom               8                     //DB7  DB6  DB5  DB4  1     0         0   0     RW=0写   RS=0指令  BLK背光
  23. //#define WriteData               9                   //DB7  DB6  DB5  DB4  1     0         0   1     RW=0写   RS=1数据
  24. //#define WriteComEn           0x0c               //DB7  DB6  DB5  DB4  1     1         0   0     RW=0写   RS=0
  25. //#define WriteDataEn           0x0d             //DB7  DB6  DB5  DB4  1     1         0   1     RW=0写   RS=1数据

  27. /*========================  PCF8574A  P3 = 0 关背光   ====================================*/

  29. //#define WriteCom               0                     //DB7  DB6  DB5  DB4  0     0         0   0     RW=0写   RS=0指令  BLK背光
  30. //#define WriteData               1                     //DB7  DB6  DB5  DB4  0     0         0   1     RW=0写   RS=1数据
  31. //#define WriteComEn           4                 //DB7  DB6  DB5  DB4  0     1         0   0     RW=0写   RS=0
  32. //#define WriteDataEn           5                 //DB7  DB6  DB5  DB4  0     1         0   1     RW=0写   RS=1数据

  34. uchar WriteCom=8,WriteData=9,WriteComEn=0x0c,WriteDataEn=0x0d;

  36. void LcdBlk()                                 //LCD背光控制 blk=1亮，blk=0灭
  37.      {
  38.          if (blk) {WriteCom=8,WriteData=9,WriteComEn=0x0c,WriteDataEn=0x0d;}
  39.                  else {WriteCom=0,WriteData=1,WriteComEn=4,WriteDataEn=5;}
  40.      }

  42. void Delayms()         //@22.1184MHz 1MS
  43. {
  44.      unsigned char i, j;

  46.      i = 22;
  47.      j = 128;
  48.      do
  49.      {
  50.          while (--j);
  51.      } while (--i);
  52. }
  53. void Timer0Init(void)         //10微秒@22.1184MHz     定时器做时钟
  54. {
  55.      AUXR |= 0x80;         //定时器时钟1T模式
  56.      TMOD& = 0xF0;         //设置定时器模式
  57.      TMOD |= 0x02;         //设置定时器模式
  58.      TL0 = 0x23;         //设置定时初值
  59.      TH0 = 0x23;         //设置定时重载值
  60.      TF0 = 0;         //清除TF0标志
  61.      TR0 = 1;         //定时器0开始计时
  62.      ET0=1;EA=1;
  63. }

  65. void Delay5us()         //@22.1184MHz
  66. {
  67.      unsigned char i;

  69.      _nop_();
  70.      _nop_();
  71.      _nop_();
  72.      i = 24;
  73.      while (--i);
  74. }
  75. void i2cStart()                 //I2C 起始信号
  76. {
  77.    SDA=1; _nop_();  SCL=1; _nop_(); _nop_(); _nop_(); _nop_(); _nop_();   SDA=0; _nop_(); _nop_(); _nop_();_nop_(); _nop_();SCL=0;Delay5us();    
  78. }

  80. void i2cStop()                 //I2C 停止信号
  81. {
  82.   SDA=0; _nop_();  SCL=1;  _nop_();  _nop_();  _nop_();  _nop_();  _nop_();  SDA=1;  _nop_();  _nop_();  _nop_();  _nop_();
  83. }

  85. void i2cAck(bit a)   //I2C应答信号
  86. {
  87. if(a==0)SDA=0;             //在此发出应答或非应答信号
  88. else SDA=1;
  89. _nop_();
  90. _nop_();
  91. _nop_();
  92. SCL=1;
  93. Delay5us();
  94. SCL=0;                         //清时钟线，钳住I2C 总线以便继续接收
  95. Delay5us();
  96. }

  98. void i2cWriteByte(uchar temp)                 //I2C写一字节
  99. {
  100.    uchar i;
  101.   for(i=0;i<8;i++)
  102.   {
  103.                SDA=(bit)(temp& 0x80) ;
  104.                temp<< =1; Delay5us();    
  105.                SCL=1;     Delay5us();     Delay5us();            
  106.          SCL=0;//Delay5us();
  107.      }
  108.                  _nop_();
  109.                  SDA=1;     _nop_();Delay5us();
  110.                  SCL=1;Delay5us();_nop_();_nop_();
  111.                  if(SDA==1)ack=0;
  112.                  else ack=1;                     //判断是否接收到应答信号
  113.                  SCL=0;
  114.               
  115.                         
  116. }

  118. void LcdCom(uchar com)                                     //LCD1602写指令
  119. {
  120.      i2cStart();                                                                     //I2C起始信号
  121.      i2cWriteByte(WriteAdd);                                             //PCF8574A写地址
  122.      i2cWriteByte((com&0xf0)|WriteCom);                   //先写LCD1602高4位指令+控制位
  123.      i2cWriteByte((com&0xf0)|WriteComEn);                 //LCD1602  CS/EN拉高送入
  124.      i2cWriteByte((com&0xf0)|WriteCom);                     //LCD1602  CS/EN拉低准备写入
  125.      com<<=4;                                                                         //指令低4位左移到高4位
  126.      i2cWriteByte((com&0xf0)|WriteCom);                     //写入剩下的4位指令+控制位
  127.      i2cWriteByte((com&0xf0)|WriteComEn);
  128.      i2cWriteByte((com&0xf0)|WriteCom);
  129.      i2cStop();Delay5us();                                                 //写完成,I2C停止信号
  130. }
  131. void LcdIni()                                                                     //1602初始化
  132.      {
  133.              LcdCom(0x33);
  134.              LcdCom(0x32);
  135.              LcdCom(0x28);
  136.              LcdCom(0x0c);
  137.              LcdCom(0x01);
  138.              LcdCom(0x80);
  139.      }
  140. void LcdData(uchar com)                                                 //LCD1602写数据
  141. {
  142.      i2cStart();                                                                     //I2C起始信号
  143.      i2cWriteByte(WriteAdd);                                             //PCF8574A写地址
  144.      i2cWriteByte((com&0xf0)|WriteData);                     //Delay5us();//先写LCD1602高4位指令+控制位
  145.      i2cWriteByte((com&0xf0)|WriteDataEn);                 //Delayms();//LCD1602  CS/EN接高送入
  146.      i2cWriteByte((com&0xf0)|WriteData);                     //LCD1602  CS/EN拉低准备写入
  147.      com<<=4;                                                                         //Delay5us();//数据低4位左移到高4位
  148.      i2cWriteByte((com&0xf0)|WriteDataEn);                 //Delayms();//写入剩下的4位数据+控制位
  149.      i2cWriteByte((com&0xf0)|WriteData);                     //写完成,I2C停止信号
  150.      i2cStop();Delay5us();
  151. }
  152. void LcdDisplay(uchar x,uchar *s)                             //1602显示字符串  //x=1显示在第一行,x=2显示在第二行
  153. {
  154.          if(x==1)         //第一行
  155.                  {            
  156.                      LcdCom(0x80);                                                 //第一行起始位置地址
  157.                      while(*s)
  158.                      {
  159.                          LcdData(*s);s++;
  160.                      }
  161.                  }
  162.          if(x==2)         //第二行
  163.                  {            
  164.                      LcdCom(0xc0);                                                 //第二行起始位置地址
  165.                      while(*s)
  166.                      {
  167.                          LcdData(*s);s++;
  168.                      }
  169.                  }
  170. }

  172. void main()
  173. {
  174.      Timer0Init();
  175.      LcdIni();

  177.     
  178. //     LcdDisplay(1,"  I LOVE YOU!");LcdDisplay(2," Do U Love Me?");
  179.     
  180.      while(1)
  181.         
  182.      {

  184.          LcdCom(0x80);    
  185.          if(hou>=24) {hou=0;}    
  186.          if(sec>=60) {sec=0;min++;blk=~blk;}
  187.          LcdBlk();
  188.      if(min>=60) {min=0;hou++;}
  189.              LcdData(num[hou/10]);LcdData(num[hou%10]);     LcdData(':');
  190.              LcdData(num[min/10]);LcdData(num[min%10]);LcdData(':');
  191.              LcdData(num[sec/10]);LcdData(num[sec%10]);

  193.      }


  196.         
  197. }
  198. void InterruptT0 () interrupt 1
  199. {
  200.      us++;
  201.      if (us>=100)
  202.          {
  203.              us=0;
  204.              ms++;
  205.          }    
  206.      if(ms>=1000)
  207.          {
  208.              ms=0;
  209.              sec++;
  210.          }


  213.     
  214. }
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沙发
ID:112693发表于 2017-4-25 23:03|只看该作者
程序是不是有问题？？

Build target '目标 1'
linking...
*** WARNING L16: UNCALLED SEGMENT, IGNORED FOR OVERLAY PROCESS
   SEGMENT: ?PR?DELAYMS?1602
*** WARNING L16: UNCALLED SEGMENT, IGNORED FOR OVERLAY PROCESS
   SEGMENT: ?PR?I2CACK?1602
*** WARNING L16: UNCALLED SEGMENT, IGNORED FOR OVERLAY PROCESS
   SEGMENT: ?PR?_LCDDISPLAY?1602
Program Size: data=32.3 xdata=0 code=778
creating hex file from "1602"...
"1602" - 0 Error(s), 3 Warning(s).
板凳
ID:749957发表于 2020-5-12 16:14|只看该作者
谢谢分享

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