# include & ltstdio.h & gt
# contains "18b20.h"
# contains "1602.h"
# contains "delay.h"
Bit ReadTempFlag// defines the read timestamp.
void Init _ timer 0(void)； //Timer initialization
/* -
Serial communication initialization
- */
void UART_Init(void)
{
SCON = 0x 50； // SCON: mode 1, 8-bit UART, enabling reception.
TMOD | = 0x 20； //tmod: timer 1, mode 2, 8-bit overload.
th 1 = 0x FD； // TH 1: reload the crystal oscillator with a baud rate of 9600+0 1.0592mhz.
tr 1 = 1； // TR 1: timer 1 on.
//EA = 1； //Open host interrupt
//ES = 1； //Open serial port interrupt
TI = 1；
}
/* -
major function
- */
Invalid master (invalid)
{
Internal temperature;
Float temperature;
Char display temperature [16]; //Defines the display area temporary storage array.
LCD _ Init()； //Initialize the liquid crystal
Delems (20); //Delay helps to stabilize.
LCD _ Clear()； //Clear the screen
init _ timer 0()；
UART _ Init()；
LCD _ User _ Chr()； //Write custom characters
LCD_Write_String(0，0，“ www.doflye.net”)；
LCD_Write_Char( 13， 1，0x 0 1)； //Write the upper right corner of the temperature.
LCD_Write_Char( 14， 1，' C ')； //write the character c
While (1) // main loop
{
if(ReadTempFlag== 1)
{
ReadTempFlag = 0；
temp = read temperature()；
Temperature = (floating point) temp * 0.0625
Sprintf(displaytemp, "Temp% 7.3f", temperature); //Print the temperature value
LCD_Write_String(0， 1，display temp)； //Display the second line
}
}
}
/* -
Timer initialization subroutine
- */
void Init_Timer0(void)
{
TMOD | = 0x 0 1； //Use 1 and 16-bit timers, and the "|" symbol is not affected when multiple timers are used.
//TH0 = 0x 00； //Given the initial value
//TL0 = 0x 00；
EA = 1； //Total interrupt open
ET0 = 1； //Timer interrupt open
TR0 = 1； //Timer switch on
}
/* -
Timer interrupt subroutine
- */
Invalid timer 0_isr (invalid) interrupt 1
{
Static unsigned integer;
TH0 =(65536-2000)/256； //Reassign the value of 2 milliseconds.
TL0 =(65536-2000)% 256；
num++；
if(num==300) //
{
num = 0；
ReadTempFlag = 1； //Read the mark position 1
}
}
/* -
Name: LCD 1602
Forum: www.doflye.net
Written by Shifang.
Date: May 2009
Modification: None
Content:
Pin definition is as follows:1-VSS 2-vdd 3-v04-RS 5-r/w 6-e 7-14db0-db715-bla16-blk.
- */
# contains "1602.h"
# contains "delay.h"
sbit RS = p2^4； //Define the port
sbit rw = p2^5；
sbit en = p2^6；
# Define RS_CLR RS=0
#define RS_SET RS= 1
# define RW_CLR RW=0
#define RW_SET RW= 1
#define EN_CLR EN=0
#define EN_SET EN= 1
# Define data port P0
/* -
Busy decision function
- */
Bit LCD_Check_Busy(void)
{
Data port = 0xFF
RS _ CLR
RW _ SET
EN _ CLR
_ nop _()；
EN _ SET
Return (bit) (data port & amp0x80);
}
/* -
Write command function
- */
Void LCD_Write_Com (unsigned character Com)
{
//while(LCD _ Check _ Busy())； //Just wait when you are busy.
Delems (5);
RS _ CLR
RW _ CLR
EN _ SET
DataPort = com
_ nop _()；
EN _ CLR
}
/* -
Write data function
- */
Void LCD_Write_Data (unsigned character data)
{
//while(LCD _ Check _ Busy())； //Just wait when you are busy.
Delems (5);
RS _ SET
RW _ CLR
EN _ SET
DataPort= data;
_ nop _()；
EN _ CLR
}
/* -
Clear screen function
- */
void LCD_Clear(void)
{
LCD _ Write _ Com(0x 0 1)；
Delems (5);
}
/* -
Write string function
- */
Void LCD_Write_String (unsigned character x, unsigned character y, unsigned character *s)
{
If (y == 0)
{
LCD _ Write _ Com(0x 80+x)； //Indicates the first line.
}
other
{
LCD _ Write _ Com(0xc 0+x)； //indicates the second line.
}
while (*s)
{
LCD _ Write _ Data(* s)；
s++；
}
}
/* -
Write character function
- */
Void LCD_Write_Char (unsigned character x, unsigned character y, unsigned character data)
{
If (y == 0)
{
LCD _ Write _ Com(0x 80+x)；
}
other
{
LCD _ Write _ Com(0xc 0+x)；
}
LCD_Write_Data (data);
}
/* -
Initialization function
- */
void LCD_Init(void)
{
LCD _ Write _ Com(0x 38)； /* Display mode setting */
Delems (5);
LCD _ Write _ Com(0x 38)；
Delems (5);
LCD _ Write _ Com(0x 38)；
Delems (5);
LCD _ Write _ Com(0x 38)；
LCD _ Write _ Com(0x 08)； /* Display off */
LCD _ Write _ Com(0x 0 1)； /* Display a clear screen */
LCD _ Write _ Com(0x 06)； /* Display cursor movement settings */
Delems (5);
LCD _ Write _ Com(0x0C)； /* Display opening and cursor setting */
}
/* -
Set two custom characters, and the address of the custom characters in LCD 1602 is 0x00-0x07.
You can define 8 characters.
Here we set the custom character to 0x00 (000).
The other is placed at position 0x00 1 (00 1).
- */
void Lcd_User_Chr(void)
{//First custom character
LCD _ Write _ Com(0x 40)； //"0 1 000 000 "line 1 address (D7D6 is in the form of an address setting command? D5D4D3 is the character storage location (0-7), and D2D 1D0 is the character line address (0-7)).
LCD _ Write _ Data(0x 00)； //"XXX 1 11"line1data (D7D6D5 is XXX, which means any number (generally 000), and D4D3D2D 1D0 is character line data (/kloc
LCD _ Write _ Com(0x 4 1)； //"0 1 000 00 1 "Address in line 2
LCD _ Write _ Data(0x 04)； //"XXX 1000 1 "data in line 2
LCD _ Write _ Com(0x 42)； //"0 1 000 0 10 "third line address
LCD _ Write _ Data(0x0e)； //"XXX10101"Line 3 data
LCD _ Write _ Com(0x 43)； //The address is in the fourth line of "0 1 000 0 1 1"
LCD _ Write _ Data(0x0e)； //"XXX 1000 1 "Line 4 data
LCD _ Write _ Com(0x 44)； //"0 1 000 100 "5th line address
LCD _ Write _ Data(0x0e)； //"XXX1111"data is in line 5.
LCD _ Write _ Com(0x 45)； //"01000101"Line 6 address
LCD _ Write _ Data(0x 1f)； //"XXX 0 10 10 "Line 6 data
LCD _ Write _ Com(0x 46)； //"01000110" Line 7 Address
LCD _ Write _ Data(0x 04)； //"XXX1111"Line 7 data
LCD _ Write _ Com(0x 47)； //"01000111"Row 8 address
LCD _ Write _ Data(0x 00)； //"XXX 00000 "Line 8 data
//The second custom character
LCD _ Write _ Com(0x 48)； //The address of "0 1 001000" is in line1
LCD _ Write _ Data(0x 03)； //"XXX 0000 1 "line 1 data
LCD _ Write _ Com(0x 49)； //The address is in the second line of "0 1 00 1 00 1"
LCD _ Write _ Data(0x 03)； //"XXX11011"data is in line 2.
LCD _ Write _ Com(0x4a)； //"01001010" 3rd line address
LCD _ Write _ Data(0x 00)； //"XXX1110/"data in the third line.
LCD _ Write _ Com(0x4b)； //The address of "0100101"is in the fourth line.
LCD _ Write _ Data(0x 00)； //"XXX11001"Line 4 data
LCD _ Write _ Com(0x4c)； //"01001100" fifth line address
LCD _ Write _ Data(0x 00)； //"XXX1110/"data is in line 5.
LCD _ Write _ Com(0x4d)； //"0100110/"Address in line 6.
LCD _ Write _ Data(0x 00)； //"XXX11011"Line 6 data
LCD _ Write _ Com(0x4e)； //Address of line 7 of "0100110"
LCD _ Write _ Data(0x 00)； //"XXX 0000 1 "Line 7 data
LCD _ Write _ Com(0x4f)； //"010011"Address on the 8th line.
LCD _ Write _ Data(0x 00)； //"XXX 00000 "Line 8 data
}
# contains "delay.h"
# contains "18b20.h"
/* -
18b20 initialization
- */
Bit Init_DS 18B20 (null)
{
Bit dat = 0；;
DQ = 1； //DQ reset
delayus 2x(5)； //A little delayed
DQ = 0； //Single chip microcomputer pulls down DQ.
dela Yus 2x(200)； //The exact delay is greater than 480us and less than 960us.
dela Yus 2x(200)；
DQ = 1； //Pull the bus high
Drayus 2x (50); // 15~60us and then receive 60-240us pulse.
dat = DQ； //If x=0, initialization succeeds; if x= 1, initialization fails.
Drayus 2x (25); //slightly delayed return
Return dat
}
/* -
Read a byte
- */
Unsigned character ReadOneChar(void)
{
Unsigned character I = 0；;
Unsigned character dat = 0；;
for(I = 8； I>0; I-)
{
DQ = 0； //Give a pulse signal
dat & gt& gt= 1;
DQ = 1； //Give a pulse signal
if(DQ)
dat | = 0x80
Drayus 2x (25);
}
return(dat)；
}
/* -
Write a byte
- */
Void WriteOneChar (unsigned character data)
{
Unsigned character I = 0；;
for(I = 8； I>0; I-)
{
DQ = 0；
DQ = date and time; 0x 0 1；
Drayus 2x (25);
DQ = 1；
dat & gt& gt= 1;
}
Drayus 2x (25);
}
/* -
Reading temperature
- */
Unsigned integer read temperature (void)
{
Unsigned character a = 0；;
Unsigned int b = 0；;
Unsigned integer t = 0；;
init _ ds 18b 20()；
WriteOneChar(0x cc)； //Skip reading serial number and column number.
WriteOneChar(0x 44)； //Start temperature conversion
delay ms( 10)；
init _ ds 18b 20()；
WriteOneChar(0x cc)； //Skip reading serial number and column number.
WriteOneChar(0x be)； //Read the temperature register (* * * can read 9 registers), the first two are the temperature.
a = ReadOneChar()； //Low position
b = ReadOneChar()； //high position
b & lt& lt=8;
t = a+b；
Return (t);
}