Fred Barnes / lib_dht22

DHT22 library, based on Simon Cooksey's. Improved with some error checking and more rigid timing (interrupts off).

Fork of lib_dht22 by Jodie Perry

Files at this revision

API Documentation at this revision

Revision 4:30a98da09c59, committed 2016-11-03

Comitter:
co657_frmb
Date:
Thu Nov 03 11:12:51 2016 +0000
Parent:
3:40df3c72813f
Commit message:
turned off debugging

Changed in this revision

dht22.cpp Show annotated file Show diff for this revision Revisions of this file
dht22.h Show annotated file Show diff for this revision Revisions of this file 
--- a/dht22.cpp	Thu Nov 03 11:08:45 2016 +0000
+++ b/dht22.cpp	Thu Nov 03 11:12:51 2016 +0000
@@ -160,9 +160,11 @@
 
         if (d > DHT22_SIGNAL_HIGH_LOW_BOUNDARY) {
             v |= (1 << bit);
+#ifdef DEBUG_DHT22
             debug = 1;
-    } else {
+        } else {
             debug = 0;
+#endif
         }
 
     }
@@ -180,8 +182,10 @@
     uint8_t buf[5];
     uint16_t u_hum, u_tmp;
     int i;
-    
+
+#ifdef DEBUG_DHT22
     debug = 0;
+#endif
     __disable_irq ();
     // Send start bits
     send_start();
@@ -227,7 +231,10 @@
     }
 
     data->checksum = buf[0];
+
+#ifdef DEBUG_DHT22
     debug = 0;
+#endif
     
     return i;
 }

--- a/dht22.h	Thu Nov 03 11:08:45 2016 +0000
+++ b/dht22.h	Thu Nov 03 11:12:51 2016 +0000
@@ -10,6 +10,7 @@
 #define DHT22_START_BIT_TIME                1000  // uS
 #define DHT22_START_BIT_RESPONSE            80   // uS
 
+#undef DEBUG_DHT22
 
 typedef struct {
     int temp;
@@ -20,7 +21,10 @@
 
 class DHT22 {
 public:
-    DHT22 (PinName pin) : dht22_s (pin), debug (PTB19)
+    DHT22 (PinName pin) : dht22_s (pin)
+#ifdef DEBUG_DHT22
+                            , debug (PTB19)     /* GROT! -- hardwired for K64F */
+#endif
     {
         dht22_s.input ();
         isinput = 1;
@@ -30,7 +34,9 @@
 private:
     DigitalInOut dht22_s;
     int isinput;
+#ifdef DEBUG_DHT22
     DigitalOut debug;
+#endif
 
     void wait_2us (void);
     void setinput (void);