AD/DA conversion (program)

#include

#include "./delay/delay.h"

#define LCD_WRITE_DATA 1

#define LCD_WRITE_COM 0

#define LCDPORT P0

#define SUCC 0

#define ERR 1

sbit RS = P2^4;

sbit RW = P2^5;

sbit E = P2^6;

sbit SCL = P1^0;

sbit SDA = P1^1;

bit ack = 0;

void iic_start()

{

SDA = 1;

SCL = 1;

delay_us(1);

SDA = 0;

delay_us(1);

SCL = 0;

}

void iic_stop()

{

SDA = 0;

SCL = 1;

delay_us(1);

SDA = 1;

delay_us(1);

SCL = 0;

}

bit iic_send_byte(unsigned char byte)

{

unsigned char i;

SDA = 1;

for(i = 0;i < 8;i++)

{

SDA = byte & 0x80;

SCL = 1;

delay_us(1);

SCL = 0;

byte <<= 1;

}

SCL = 1;

SDA = 1;

delay_us(1);

if(0 == SDA)

{

ack = 1;

}

else

{

ack = 0;

}

SCL = 0;

return ack;

}

void iic_noack()

{

SDA = 1;

SCL = 1;

delay_us(1);

SCL = 0;

}

void iic_ack()

{

SDA = 0;

SCL = 1;

delay_us(1);

SCL = 0;

}

unsigned char iic_rcv_byte()

{

unsigned char i;

unsigned char temp = 0;

unsigned char a;

SDA = 1;

for(i = 0;i < 8;i++)

{

SCL = 0;

delay_us(1);

SCL = 1;

if(SDA == 1)

{

a = 0x01;

}

else

{

a = 0x0;

}

temp |= (a<<(7-i));

delay_us(1);

}

SCL = 0;

return temp;

}

unsigned char AT24C02_send_str(unsigned char devaddr,unsigned char romaddr,unsigned char *s,unsigned char num)

{

unsigned char i;

iic_start();

iic_send_byte(devaddr);

if(0 == ack) return ERR;

iic_send_byte(romaddr);

if(0 == ack) return ERR;

for(i = 0;i < num;i++)

{

iic_send_byte(*s);

if(0 == ack) return ERR;

s++;

}

iic_stop();

return SUCC;

}

unsigned char AT24C02_rcv_byte(unsigned char devaddr,unsigned char romaddr,unsigned char *s,unsigned char num)

{

unsigned char i;

iic_start();

iic_send_byte(devaddr);

if(0 == ack) return ERR;

iic_send_byte(romaddr);

if(0 == ack) return ERR;

iic_start();

iic_send_byte(devaddr + 1);

for(i = 0;i < num - 1;i++)

{

*s = iic_rcv_byte();

iic_ack();

s++;

}

*s = iic_rcv_byte();

iic_noack();

iic_stop();

return SUCC;

}

void lcd1602_write_data(unsigned char byte,unsigned char flag)

{

if(flag)

{

RS = 1;

}

else

{

RS = 0;

}

RW = 0;

E = 1;

LCDPORT = byte;

delay_us(5);

E = 0;

}

void lcd_init()

{

delay_ms(15);

lcd1602_write_data(0x38,LCD_WRITE_COM);

delay_ms(5);

lcd1602_write_data(0x38,LCD_WRITE_COM);

delay_ms(5);

lcd1602_write_data(0x38,LCD_WRITE_COM);

delay_ms(5);

lcd1602_write_data(0x38,LCD_WRITE_COM);

delay_ms(5);

lcd1602_write_data(0x08,LCD_WRITE_COM);

delay_ms(5);

lcd1602_write_data(0x01,LCD_WRITE_COM);

delay_ms(5);

lcd1602_write_data(0x06,LCD_WRITE_COM);

delay_ms(5);

lcd1602_write_data(0x0c,LCD_WRITE_COM);

delay_ms(5);

}

void lcd_write_str(unsigned char x,unsigned char y,unsigned char *p)

{

if((x > 15) || (y > 1))

{

return;

}

if(0 == y)

{

lcd1602_write_data(0x80+x,LCD_WRITE_COM);

}

else

{

lcd1602_write_data(0x80+0x40+x,LCD_WRITE_COM);

}

while(*p != '')

{

  lcd1602_write_data(*p,LCD_WRITE_DATA);

p++;

}

}

unsigned char AD_read()

{

unsigned char temp;

iic_start();

iic_send_byte(0x90);

if(0 == ack) return ERR;

iic_send_byte(0x40);

iic_start();

iic_send_byte(0x90+1);

if(0 == ack) return ERR;

}

temp = iic_rcv_byte();

iic_noack();

iic_stop();

return temp;

void lcd_dis_char(unsigned char x, unsigned char y, unsigned char byte)

{

    if((x > 15) || (y > 1))

{

  return ;

}

if(0 == y)

{

  lcd1602_write_data(0x80 + x,LCD_WRITE_COM);

}

else

{

  lcd1602_write_data(0x80 + 0x40 + x,LCD_WRITE_COM);

}

lcd1602_write_data(byte,LCD_WRITE_DATA);

}

unsigned char DA_write(unsigned char num)

{

iic_start();

iic_send_byte(0x90);

if(0 == ack) return ERR;

iic_send_byte(0x40);

if(0 == ack) return ERR;

iic_send_byte(num);

if(0 == ack) return ERR;

iic_stop();

return SUCC;

}

void main()

{

unsigned char num;

unsigned char test;

unsigned char v;

lcd_init();

    while(1)

{

test = AD_read();

v = test*100 / 51; 

lcd_dis_char(0,0,(test/100)+0x30);

lcd_dis_char(1,0,(test%100/10)+0x30);

lcd_dis_char(2,0,(test%10)+0x30);

lcd_dis_char(0,1,(v/100)+0x30);

lcd_dis_char(1,1,'.');

lcd_dis_char(2,1,(v%100)/10+0x30);

lcd_dis_char(3,1,(v%10)+0x30);

DA_write(num);

num++;

delay_ms(2);

}

}