Hola, aqui os dejo una libreria en CCS para el sensor de temperatura DS1820, la pega es que consume mucha memoria, si alguien conoce una libreria mejor que la pegue.
////////////////////////////////////////////////////////////////////////////
//// Library for a Dallas 1820 Temperature chip ////
//// ////
//// init_temp(); Call before the other functions are used ////
//// ////
//// ////
//// d = read_full_temp(); Read the temp in degrees C (0 to 125) ////
//// ////
////////////////////////////////////////////////////////////////////////////
#ifndef DS1820_PIN
#define DS1820_PIN PIN_B0
#endif
#define TOUCH_PIN DS1820_PIN
#include "touch.c"
void init_temp() {
}
float read_full_temp()
{
byte i, buffer[9];
float minstep;
if (touch_present()) { // get present (reset) (2)
touch_write_byte(0xCC); // Skip ROM (3)
touch_write_byte (0x44); // Start Conversion
delay_ms(200); // delay 200 ms (4)
touch_present(); // get present (reset) (5)
touch_write_byte(0xCC); // Skip ROM (6)
touch_write_byte (0xBE); // Read Scratch Pad
for(i=0; i<9;i++) // read 9 bytes (7)
buffer[i] = touch_read_byte();
}
//minstep = (float)(buffer[0]/2)-0.25+((float)( buffer[7]-buffer[6])/buffer[7]);
if(buffer[1]){
minstep = (float)(-1)*(~make16(buffer[1],buffer[0])+1)/2;
}else{
minstep = (float)(make16(buffer[1],buffer[0])/2);
}
minstep = minstep - 0.25 + ((float)( buffer[7] - buffer[6])/buffer[7]);
return (minstep);
}
Aqui un ejemplo de uso:
#include <16F876.h> //Standard header file
#fuses NOWDT,HS, NOPUT, NOPROTECT,NOLVP,BROWNOUT //Oscillator mode HS
#use delay(clock=20000000) //Clock speed HZ = 20MHZ
#define use_portd_lcd //define for use port d lcd
#define DS1820_PIN PIN_A2
#define use_portb_lcd TRUE
#include "lcd.c"
#include "ds1820.c"
void main() {
float minstep;
int16 a;
int b;
lcd_init();
do {
minstep = read_full_temp();
printf (lcd_putc,"\fTemp :%3.2f C", minstep);
delay_ms(1000);
} while (TRUE);
}
