Diff: main.cpp

Revision:

2:ffa66d4cd7cf

Parent:

1:10bbb8a13329

Child:

3:5055285819f7

--- a/main.cpp	Thu Mar 27 17:26:59 2014 +0000
+++ b/main.cpp	Wed Dec 02 19:26:14 2020 +0000
@@ -1,38 +1,40 @@
+/*
+ * DS1820 sensor demo
+ *
+ * Note: Don't forget to connect a 4.7k Ohm resistor 
+ *       between the DS1820's data pin and the +3.3V pin
+ *
+ */
 #include "mbed.h"
 #include "DS1820.h"
-
+  
 Serial pc(SERIAL_TX, SERIAL_RX);
-
-const int MAX_PROBES = 3;
-DS1820 probe[3] = {D2, D2, D2};
-
-
-int main()
-{
-    int i;
-    int devices_found=0;
-    
-    //pc.attach(&pcRx, pc.RxIrq);
-    pc.printf("Started\r\n");
+DigitalOut  led(LED1);   
+DS1820      ds1820(D2);    // substitute PA_9 with actual mbed pin name connected to the DS1820 data pin                             
+float       temp = 0;
 
-    pc.printf("search_ROM_setup\r\n");
-    probe[0].search_ROM_setup();
-    pc.printf("search_ROM\r\n");
-    while (probe[devices_found].search_ROM() and devices_found<MAX_PROBES-1)
-          devices_found++;
+int main() 
+{                          
+    int  error = 0; 
     
-    // If maximum number of probes are found,
-    // bump the counter to include the last array entry
-    if (probe[devices_found].ROM[0] != 0xFF)
-        devices_found++;
-    pc.printf("devices found:%d\r\n", devices_found);
-
-
-    while(1) {
-        probe[0].convert_temperature(DS1820::all_devices);
-        for (i=0; i<devices_found; i++) {
-            pc.printf("Device[%d]: %3.1f \r\n",i, probe[i].temperature('c'));
+    if(ds1820.begin()) {
+        while(1) {
+            ds1820.startConversion();  // start temperature conversion from analog to digital
+            wait(1.0);                 // let DS1820 complete the temperature conversion 
+            error = ds1820.read(temp); // read temperature from DS1820 and perform cyclic redundancy check (CRC)
+            switch(error) {
+            case 0:    // no errors -> 'temp' contains the value of measured temperature
+                pc.printf("temp = %3.1f C\r\n", temp);
+                break;
+            case 1:    // no sensor present -> 'temp' is not updated
+                pc.printf("no sensor present\n\r");
+                break;
+            case 2:    // CRC error -> 'temp' is not updated
+                pc.printf("CRC error\r\n");
+            } 
+            led = !led;
         }
-        wait(1.0); // 1 sec
-    }
+    } else
+        pc.printf("No DS1820 sensor found!\r\n");
 }
+ 
\ No newline at end of file