Zdravím,
mám následující problém, avr mi na LCD vypíše pouze tuto hodnotu: t1=3f°C. Bohužel nevím, co ještě vyzkoušet. ds18b20_temperature je v knihovně definován jako float. Věděl by někdo, co s tím? Díky…
[code]
#include <mega644p.h>
// 1 Wire Bus interface functions
#include <1wire.h>
// DS1820 Temperature Sensor functions
#include <ds18b20.h>
#include <delay.h>
#include <stdio.h>
// maximum number of DS1820 devices
// connected to the 1 Wire bus
#define MAX_DS18B20 8
// number of DS1820 devices
// connected to the 1 Wire bus
unsigned char ds18b20_devices;
// DS1820 devices ROM code storage area,
// 9 bytes are used for each device
// (see the w1_search function description in the help)
unsigned char ds1820_rom_codes[MAX_DS18B20][9];
// Alphanumeric LCD Module functions
#include <alcd.h>
// Declare your global variables here
char lcd_buffer[33];
void main(void)
{
unsigned char i,j;
lcd_init(16);
lcd_putsf(“CodeVisionAVR\n1 Wire Bus Demo”);
delay_ms(2000);
lcd_clear();
/* detect how many DS18B20 devices
are connected to the 1 Wire bus */
ds18b20_devices=w1_search(0xf0,ds1820_rom_codes);
sprintf(lcd_buffer,"%u DS18B20\nDevice detected",ds18b20_devices);
lcd_puts(lcd_buffer);
delay_ms(2000);
/* display the ROM codes for each device /
if (ds18b20_devices)
{
for (i=0;i<ds18b20_devices;i++)
{
sprintf(lcd_buffer,“Device #%u ROM\nCode is:”,i+1);
lcd_clear();
lcd_puts(lcd_buffer);
delay_ms(2000);
lcd_clear();
for (j=0;j<8;j++)
{
sprintf(lcd_buffer,"%02X ",ds1820_rom_codes[j]);
lcd_puts(lcd_buffer);
if (j==3) lcd_gotoxy(0,1);
};
delay_ms(5000);
};
}
else
while (1); /* stop here if no devices were found */
/* configure each DS18B20 device for 12 bit temperature
measurement resolution /
for (i=0;i<ds18b20_devices;)
if (!ds18b20_init(&ds1820_rom_codes[0],20,30,DS18B20_12BIT_RES))
{
sprintf(lcd_buffer,“Init error for\ndevice #%u”,i);
lcd_clear();
lcd_puts(lcd_buffer);
while (1); /* stop here if init error */
};
/* measure and display the temperature(s) /
while (1)
{
j=1;
for (i=0;i<ds18b20_devices;i++)
{
sprintf(lcd_buffer,“t%u=%+.3f\xdfC”,j++,ds18b20_temperature(&ds1820_rom_codes[0]));
lcd_clear();
lcd_puts(lcd_buffer);
delay_ms(500);
};
};
}
[/code]***
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