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標題: 1602液晶顯示adda轉換值 [打印本頁]

作者: christopher-che 時間: 2017-7-23 21:19
標題: 1602液晶顯示adda轉換值
#include <reg52.h>
#include <intrins.h>
#define MAIN_Fosc       11059200UL //ºê¶¨ÒåÖ÷Ê±ÖÓHZ
#define PCF8591_ADDR 0x90       //PCF8591µØÖ·
#define DACOUT_EN       0x40       //DACÊä³öÊ¹ÄÜ

/*====================================
×Ô¶¨ÒåÀàÐÍÃû
====================================*/
typedef unsigned char INT8U;
typedef unsigned char uchar;

typedef unsigned int INT16U;
typedef unsigned int uint;

sbit SDA = P2^0; //I2C´®ÐÐÊý¾Ý
sbit SCL = P2^1; //I2C´®ÐÐÊ±ÖÓ
sbit DU  = P2^6; //ÊýÂë¹Ü¶ÎÑ¡
sbit WE  = P2^7; //ÊýÂë¹ÜÎ»Ñ¡
sbit LED1= P1^0; //¶ÁÈ¡ADµÄÖµÊÇ·ñ³É¹¦£¨ÁÁ³É¹¦£¬ÃðÊ§°Ü£©
sbit LED2= P1^1; //DAC³É¹¦Êä³ö£¨ÁÁ³É¹¦£¬ÃðÊ§°Ü£©
uchar AD_Value;
sbit rs=P3^5;
sbit lcden=P3^4;
sbit dula=P2^6;
sbit wela=P2^7;

void delay(uint x)//ÑÓÊ±º¯Êý
{
uint a,b;
for(a=x;a>0;a--)
      for(b=10;b>0;b--);
}
void write_com(uchar com)
{
P0=com;
rs=0;
lcden=0;
delay(10);
lcden=1;
delay(10);
lcden=0;

}

void write_date(uchar date)
{
P0=date;
rs=1;
lcden=0;
delay(10);
lcden=1;
delay(10);
lcden=0;

}

void init()
{
dula=0;
wela=0;
write_com(0x38);
delay(20);
write_com(0x0c);
delay(20);
write_com(0x06);
delay(20);
write_com(0x01);
delay(20);
}
/*====================================
º¯Êý£ºvoid Delay_Ms(INT16U ms)
²ÎÊý£ºms£¬ºÁÃëÑÓÊ±ÐÎ²Î
ÃèÊö£º12T 51µ¥Æ¬»ú×ÔÊÊÓ¦Ö÷Ê±ÖÓºÁÃë¼¶ÑÓÊ±º¯Êý
====================================*/
void Delay_Ms(INT16U ms)
{
   INT16U i;
   do{
      i = MAIN_Fosc / 96000;
      while(--i); //96T per loop
   }while(--ms);
}

/*====================================
º¯Êý£ºvoid Delay5us()
ÃèÊö£º12T 51µ¥Æ¬»ú5Î¢ÃëÑÓÊ±º¯Êý×ÔÊÊÓ¦Ê±ÖÓ£¨11.0592M£¬12M,22.1184M£©
====================================*/
void Delay5us()
{
#if MAIN_Fosc == 11059200
      _nop_();
#elif MAIN_Fosc == 12000000
      _nop_()
#elif MAIN_Fosc == 22118400
      _nop_(); _nop_(); _nop_();
#endif
}
/*====================================
º¯Êý£ºI2C_init()
ÃèÊö£ºI2C×ÜÏß³õÊ¼»¯
====================================*/
void I2C_init()
{
SDA = 1; //Êý¾Ý×ÜÏß¸ß
_nop_();
SCL = 1; //Ê±ÖÓ×ÜÏß¸ß
_nop_();
}

/*====================================
º¯Êý£ºI2C_Start()
ÃèÊö£ºI2CÆðÊ¼ÐÅºÅ
====================================*/
void I2C_Start()
{
SCL = 1;
_nop_();
SDA = 1;
Delay5us();
SDA = 0;
Delay5us();
}

/*====================================
º¯Êý£ºI2C_Stop()
ÃèÊö£ºI2CÍ£Ö¹ÐÅºÅ
====================================*/
void I2C_Stop()
{
SDA = 0;
_nop_();
SCL = 1;
Delay5us();
SDA = 1;
Delay5us();
}

/*====================================
º¯Êý£ºMaster_ACK(bit i)
²ÎÊý£ºi Îª0Ê±·¢ËÍ·ÇÓ¦´ð Îª1Ê±·¢ËÍÓ¦´ð
ÃèÊö£ºI2CÖ÷»ú·¢ËÍÓ¦´ð
====================================*/
void Master_ACK(bit i)
{
SCL = 0; // ÀµÍÊ±ÖÓ×ÜÏßÔÊÐíSDAÊý¾Ý×ÜÏßÉÏµÄÊý¾Ý±ä»¯
_nop_(); // ÈÃ×ÜÏßÎÈ¶¨
if (i)    //Èç¹ûi = 1 ÄÇÃ´ÀµÍÊý¾Ý×ÜÏß ±íÊ¾Ö÷»úÓ¦´ð
{
      SDA = 0;
}
else
{
      SDA = 1;    //·¢ËÍ·ÇÓ¦´ð
}
_nop_();//ÈÃ×ÜÏßÎÈ¶¨
SCL = 1;//À¸ßÊ±ÖÓ×ÜÏß ÈÃ´Ó»ú´ÓSDAÏßÉÏ¶Á×ß Ö÷»úµÄÓ¦´ðÐÅºÅ
_nop_();
SCL = 0;//ÀµÍÊ±ÖÓ×ÜÏß£¬ Õ¼ÓÃ×ÜÏß¼ÌÐøÍ¨ÐÅ
_nop_();
SDA = 1;//ÊÍ·ÅSDAÊý¾Ý×ÜÏß¡£
_nop_();
}

/*====================================
º¯Êý£ºTest_ACK()
·µ»Ø£º0Îª·ÇÓ¦´ð 1ÎªÓ¦´ð
ÃèÊö£ºI2C¼ì²â´Ó»úÓ¦´ð
====================================*/
bit Test_ACK()    // ¼ì²â´Ó»úÓ¦´ð
{
SCL = 1;//Ê±ÖÓ×ÜÏßÎª¸ßµçÆ½ÆÚ¼ä¿ÉÒÔ¶ÁÈ¡´Ó»úÓ¦´ðÐÅºÅ
Delay5us();
if (SDA)
{
      SCL = 0;
      I2C_Stop();
      return(0);
}
else
{
      SCL = 0;
      return(1);
}
}

/*====================================
º¯Êý£ºI2C_send_byte(uchar byte)
²ÎÊý£ºbyte Òª·¢ËÍµÄ×Ö½Ú
ÃèÊö£ºI2C·¢ËÍÒ»¸ö×Ö½Ú
====================================*/
void I2C_send_byte(uchar byte)
{
uchar i;
for(i = 0 ; i < 8 ; i++)
{
      SCL = 0;
      _nop_();
      if (byte & 0x80) //
      {
         SDA = 1;
         _nop_();
      }
      else
      {
         SDA = 0;
         _nop_();
      }
      SCL = 1;
      _nop_();
      byte <<= 1;
}
SCL = 0;
_nop_();
SDA = 1;
_nop_();
}

/*====================================
º¯Êý£ºI2C_read_byte()
·µ»Ø£º¶ÁÈ¡µÄ×Ö½Ú
ÃèÊö£ºI2C¶ÁÒ»¸ö×Ö½Ú
====================================*/
uchar I2C_read_byte()
{
uchar i, dat;
SCL = 0 ;
_nop_();
SDA = 1;
_nop_();
for(i = 0 ; i < 8 ; i++)
{
      SCL = 1;
      _nop_();
      dat <<= 1;
      if (SDA)
      {
         dat |= 0x01;
      }
      _nop_();
      SCL = 0;
      _nop_();
}
return(dat);
}

/*DACÊä³ö*/
bit DAC_OUT(uchar DAT)
{
I2C_Start();
I2C_send_byte(PCF8591_ADDR+0);//ADDR=0x90
if (!Test_ACK())
{
      return(0);
}
I2C_send_byte(DACOUT_EN); //DAÊä³öÊ¹ÄÜ ¿ØÖÆ×Ö½Ú
if (!Test_ACK())
{
      return(0);
}
I2C_send_byte(DAT);
if (!Test_ACK())
{
      return(0);
}
I2C_Stop();
return(1);
}

/*¶ÁADÊý¾Ý*/
bit ADC_Read(uchar CON)
{
I2C_Start();
I2C_send_byte(PCF8591_ADDR+0);
if (!Test_ACK())
{
      return(0);
}
I2C_send_byte(CON);
Master_ACK(0);
I2C_Start();
I2C_send_byte(PCF8591_ADDR+1);
if (!Test_ACK())
{
      return(0);
}
AD_Value = I2C_read_byte();
Master_ACK(0);
I2C_Stop();
return(1);
}
void main()
{
I2C_init();
init();
write_com(0x80+5);
delay(20);
while(1)
{
      //µ¥¶ËÊäÈë£¬¶Á³öÍ¨µÀ2µÄÖµ
      if (ADC_Read(0x00)) LED1 = 0; else LED1 = 1;
      if (DAC_OUT(AD_Value)) LED2 = 0; else LED2 = 1;
      write_date(AD_Value/100+'0');
      write_date(AD_Value%100/10+'0');
      write_date(AD_Value%10+'0');
      write_com(0x80+5);

      Delay_Ms(100);
}
}

作者: vktpas 時間: 2018-1-16 15:17
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