www.pudn.com > DS18B20.rar > ds18b20.i
/* Multipoint thermometer with LCD display
using the Maxim DS18B20
1 Wire bus temperature sensors
CodeVisionAVR C Compiler
(C) 2000-2005 HP InfoTech S.R.L.
www.hpinfotech.ro
Chip: ATmega8515
Memory Model: SMALL
Data Stack Size: 128 bytes
THE ATmega8515 CLOCK FREQUENCY MUST BE 3.6864 MHz
The DS18B20 sensors are connected to
bit 6 of PORTA of the ATmega8515 as follows:
[DS18B20] [STK500 PORTA HEADER]
1 GND - 9 GND
2 DQ - 7 PA6
3 VDD - 10 +5V
All the temperature sensors must be connected
in parallel
AN 4.7k PULLUP RESISTOR MUST BE CONNECTED
BETWEEN DQ (PA6) AND +5V !
*/
#asm
.equ __w1_port=0x1b
.equ __w1_bit=6
#endasm
/* Use an 2x16 alphanumeric LCD connected
to PORTC as follows:
[LCD] [STK500 PORTC HEADER]
1 GND- 9 GND
2 +5V- 10 VCC
3 VLC- LCD contrast control voltage 0..1V
4 RS - 1 PC0
5 RD - 2 PC1
6 EN - 3 PC2
11 D4 - 5 PC4
12 D5 - 6 PC5
13 D6 - 7 PC6
14 D7 - 8 PC7
*/
#asm
.equ __lcd_port=0x15
#endasm
/* LCD driver routines
CodeVisionAVR C Compiler
(C) 1998-2003 Pavel Haiduc, HP InfoTech S.R.L.
BEFORE #include -ING THIS FILE YOU
MUST DECLARE THE I/O ADDRESS OF THE
DATA REGISTER OF THE PORT AT WHICH
THE LCD IS CONNECTED!
EXAMPLE FOR PORTB:
#asm
.equ __lcd_port=0x18
#endasm
#include
*/
#pragma used+
void _lcd_ready(void);
void _lcd_write_data(unsigned char data);
// write a byte to the LCD character generator or display RAM
void lcd_write_byte(unsigned char addr, unsigned char data);
// read a byte from the LCD character generator or display RAM
unsigned char lcd_read_byte(unsigned char addr);
// set the LCD display position x=0..39 y=0..3
void lcd_gotoxy(unsigned char x, unsigned char y);
// clear the LCD
void lcd_clear(void);
void lcd_putchar(char c);
// write the string str located in SRAM to the LCD
void lcd_puts(char *str);
// write the string str located in FLASH to the LCD
void lcd_putsf(char flash *str);
// initialize the LCD controller
unsigned char lcd_init(unsigned char lcd_columns);
#pragma used-
#pragma library lcd.lib
/*
CodeVisionAVR C Compiler
(C) 1998-2005 Pavel Haiduc, HP InfoTech S.R.L.
Prototypes for Dallas Semiconductor
DS18B20 1 Wire bus temperature sensor
functions
BEFORE #include -ING THIS FILE YOU
MUST DECLARE THE I/O ADDRESS OF THE
DATA REGISTER OF THE PORT AT WHICH
THE 1 WIRE BUS IS CONNECTED AND
THE DATA BIT USED
EXAMPLE FOR PORTB:
#asm
.equ __w1_port=0x18
.equ __w1_bit=3
#endasm
#include
*/
/*
CodeVisionAVR C Compiler
(C) 1998-2000 Pavel Haiduc, HP InfoTech S.R.L.
Prototypes for Dallas Semiconductor
1 Wire protocol functions
BEFORE #include -ING THIS FILE YOU
MUST DECLARE THE I/O ADDRESS OF THE
DATA REGISTER OF THE PORT AT WHICH
THE 1 WIRE BUS IS CONNECTED AND
THE DATA BIT USED
EXAMPLE FOR PORTB:
#asm
.equ __w1_port=0x18
.equ __w1_bit=3
#endasm
#include <1wire.h>
*/
#pragma used+
unsigned char w1_init(void);
unsigned char w1_read(void);
unsigned char w1_write(unsigned char data);
unsigned char w1_search(unsigned char cmd,void *p);
unsigned char w1_dow_crc8(void *p,unsigned char n);
#pragma used-
#pragma used+
extern struct __ds18b20_scratch_pad_struct
{
unsigned char temp_lsb,temp_msb,
temp_high,temp_low,
conf_register,
res1,
res2,
res3,
crc;
} __ds18b20_scratch_pad;
unsigned char ds18b20_select(unsigned char *addr);
unsigned char ds18b20_read_spd(unsigned char *addr);
float ds18b20_temperature(unsigned char *addr);
unsigned char ds18b20_init(unsigned char *addr,signed char temp_low,signed char temp_high,
unsigned char resolution);
#pragma used-
#pragma library ds18b20.lib
// CodeVisionAVR C Compiler
// (C) 1998-2000 Pavel Haiduc, HP InfoTech S.R.L.
#pragma used+
void delay_us(unsigned int n);
void delay_ms(unsigned int n);
#pragma used-
// CodeVisionAVR C Compiler
// (C) 1998-2006 Pavel Haiduc, HP InfoTech S.R.L.
// Prototypes for standard I/O functions
// CodeVisionAVR C Compiler
// (C) 1998-2002 Pavel Haiduc, HP InfoTech S.R.L.
// Variable length argument list macros
typedef char *va_list;
#pragma used+
char getchar(void);
void putchar(char c);
void puts(char *str);
void putsf(char flash *str);
char *gets(char *str,unsigned int len);
void printf(char flash *fmtstr,...);
void sprintf(char *str, char flash *fmtstr,...);
void snprintf(char *str, unsigned int size, char flash *fmtstr,...);
void vprintf (char flash * fmtstr, va_list argptr);
void vsprintf (char *str, char flash * fmtstr, va_list argptr);
void vsnprintf (char *str, unsigned int size, char flash * fmtstr, va_list argptr);
signed char scanf(char flash *fmtstr,...);
signed char sscanf(char *str, char flash *fmtstr,...);
#pragma used-
#pragma library stdio.lib
char lcd_buffer[33];
main()
{
//unsigned char i,j,devices;
float aa;
lcd_init(16);
lcd_putsf("CodeVisionAVR\n1 Wire Bus Demo");
delay_ms(2000);
lcd_clear();
if(ds18b20_init(0,25,35,3 )==0)
{
while (1); /* stop here if init error */
};
while (1)
{
//j=1;
//for (i=0;i<1;i++)
// {
aa=ds18b20_temperature(0);
if(aa>125)
sprintf(lcd_buffer,"t=%+.1f\xdfC",aa-4096);
else
sprintf(lcd_buffer,"t=%+.1f\xdfC",aa);
lcd_clear();
lcd_puts(lcd_buffer);
delay_ms(500);
//};
};
}