#include <reg52.h>
#include <intrins.h>
#define MAIN_Fosc 11059200UL //ºê¶¨ÒåÖ÷ʱÖÓHZ
#define PCF8591_ADDR 0x90 //PCF8591µØÖ·
#define DACOUT_EN 0x40 //DACÊä³öʹÄÜ
/*====================================
×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´®ÐÐʱÖÓ
sbit DU = P2^6; //ÊýÂë¹Ü¶ÎÑ¡
sbit WE = P2^7; //ÊýÂë¹Üλѡ
sbit LED1= P1^0; //¶ÁÈ¡ADµÄÖµÊÇ·ñ³É¹¦£¨ÁÁ³É¹¦£¬Ãðʧ°Ü£©
sbit LED2= P1^1; //DAC³É¹¦Êä³ö£¨ÁÁ³É¹¦£¬Ãðʧ°Ü£©
uchar AD_Value;
sbit rs=P3^5;
sbit lcden=P3^4;
sbit dula=P2^6;
sbit wela=P2^7;
void delay(uint x)//ÑÓʱº¯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£¬ºÁÃëÑÓʱÐβÎ
ÃèÊö£º12T 51µ¥Æ¬»ú×ÔÊÊÓ¦Ö÷ʱÖÓºÁÃ뼶ÑÓʱº¯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¬»ú5΢ÃëÑÓʱº¯Êý×ÔÊÊӦʱÖÓ£¨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×ÜÏß³õʼ»¯
====================================*/
void I2C_init()
{
SDA = 1; //Êý¾Ý×ÜÏ߸ß
_nop_();
SCL = 1; //ʱÖÓ×ÜÏ߸ß
_nop_();
}
/*====================================
º¯Êý£ºI2C_Start()
ÃèÊö£ºI2CÆðʼÐźÅ
====================================*/
void I2C_Start()
{
SCL = 1;
_nop_();
SDA = 1;
Delay5us();
SDA = 0;
Delay5us();
}
/*====================================
º¯Êý£ºI2C_Stop()
ÃèÊö£ºI2CÍ£Ö¹ÐźÅ
====================================*/
void I2C_Stop()
{
SDA = 0;
_nop_();
SCL = 1;
Delay5us();
SDA = 1;
Delay5us();
}
/*====================================
º¯Êý£ºMaster_ACK(bit i)
²ÎÊý£ºi Ϊ0ʱ·¢ËÍ·ÇÓ¦´ð Ϊ1ʱ·¢ËÍÓ¦´ð
ÃèÊö£ºI2CÖ÷»ú·¢ËÍÓ¦´ð
====================================*/
void Master_ACK(bit i)
{
SCL = 0; // ÀµÍʱÖÓ×ÜÏßÔÊÐíSDAÊý¾Ý×ÜÏßÉϵÄÊý¾Ý±ä»¯
_nop_(); // ÈÃ×ÜÏßÎȶ¨
if (i) //Èç¹ûi = 1 ÄÇôÀµÍÊý¾Ý×ÜÏß ±íʾÖ÷»úÓ¦´ð
{
SDA = 0;
}
else
{
SDA = 1; //·¢ËÍ·ÇÓ¦´ð
}
_nop_();//ÈÃ×ÜÏßÎȶ¨
SCL = 1;//À¸ßʱÖÓ×ÜÏß Èôӻú´ÓSDAÏßÉ϶Á×ß Ö÷»úµÄÓ¦´ðÐźÅ
_nop_();
SCL = 0;//ÀµÍʱÖÓ×ÜÏߣ¬ Õ¼ÓÃ×ÜÏß¼ÌÐøͨÐÅ
_nop_();
SDA = 1;//ÊÍ·ÅSDAÊý¾Ý×ÜÏß¡£
_nop_();
}
/*====================================
º¯Êý£ºTest_ACK()
·µ»Ø£º0Ϊ·ÇÓ¦´ð 1ΪӦ´ð
ÃèÊö£ºI2C¼ì²â´Ó»úÓ¦´ð
====================================*/
bit Test_ACK() // ¼ì²â´Ó»úÓ¦´ð
{
SCL = 1;//ʱÖÓ×ÜÏßΪ¸ßµçƽÆÚ¼ä¿ÉÒÔ¶ÁÈ¡´Ó»úÓ¦´ðÐźÅ
Delay5us();
if (SDA)
{
SCL = 0;
I2C_Stop();
return(0);
}
else
{
SCL = 0;
return(1);
}
}
/*====================================
º¯Êý£ºI2C_send_byte(uchar byte)
²ÎÊý£ºbyte Òª·¢Ë͵Ä×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); //DAÊä³öʹÄÜ ¿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¥¶ËÊäÈ룬¶Á³öͨµÀ2µÄÖµ
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);
}
}
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