main.cpp

00001 /* This is a thermometer using DS1820. With DS1820 library 
00002 of Michael Hagberg, I just used most of the sample cords.
00003 Please see notebook [http://mbed.org/users/jf1vrr/notebook/ds1820-thermometer/].
00004 */
00005 #include "mbed.h"
00006 #include "TextLCD.h"
00007 #include "DS1820.h"
00008 
00009 TextLCD lcd(p24, p26, p27, p28, p29, p30);
00010 
00011 const int MAX_PROBES = 1;
00012 DS1820* probe[MAX_PROBES];
00013 
00014 int main() {
00015     int i;
00016     int devices_found=0;
00017     // Initialize the probe array to DS1820 objects
00018      for (i = 0; i < MAX_PROBES; i++)
00019         probe[i] = new DS1820(p19);
00020     // Initialize global state variables
00021     probe[0]->search_ROM_setup();
00022     // Loop to find all devices on the data line
00023     while (probe[devices_found]->search_ROM() and devices_found<MAX_PROBES-1)
00024         devices_found++;
00025     // If maximum number of probes are found, 
00026     // bump the counter to include the last array entry
00027     if (probe[devices_found]->ROM[0] != 0xFF)
00028         devices_found++;
00029 
00030     lcd.cls();
00031     if (devices_found==0)
00032         lcd.printf("No devices found");
00033     else {
00034         lcd.printf("DS1820 Thermo" );
00035         while (true) {
00036             probe[0]->convert_temperature(DS1820::all_devices);
00037             lcd.locate(0,1);
00038             for (i=0; i<devices_found; i++) {
00039                 lcd.printf("%4.1fc",probe[i]->temperature('c'));
00040             }
00041         }
00042     }
00043 }