Erik -
Library for reading temperature from DS1820, DS18B20 and DS1822
Dependents: heatmap BLE_Temperature BLE_Temperature_Exercise F334andDS18B20 ... more
Fork of
DS1820
by 
David Pairman
HelloWorld: http://mbed.org/users/Sissors/code/DS1820_HelloWorld/
Library should currently work on all mbed targets, let me know if there is an issue. First however make sure you have latest version of mbed library and this library.
Revision 7:58b61681818f, committed 2014-04-08
- Comitter:
- Sissors
- Date:
- Tue Apr 08 09:59:18 2014 +0000
- Parent:
- 6:abfdd851218a
- Child:
- 8:d87e11e8d012
- Commit message:
- Added define for invalid conversion
Changed in this revision
| DS1820.cpp | Show annotated file Show diff for this revision Revisions of this file |
| DS1820.h | Show annotated file Show diff for this revision Revisions of this file |
--- a/DS1820.cpp Wed Apr 02 19:10:34 2014 +0000
+++ b/DS1820.cpp Tue Apr 08 09:59:18 2014 +0000
@@ -353,7 +353,7 @@
read_RAM();
if (RAM_checksum_error())
// Indicate we got a CRC error
- answer = -1000.0;
+ answer = invalid_conversion;
else {
reading = (RAM[1] << 8) + RAM[0];
if (reading & 0x8000) { // negative degrees C
--- a/DS1820.h Wed Apr 02 19:10:34 2014 +0000
+++ b/DS1820.h Tue Apr 08 09:59:18 2014 +0000
@@ -54,6 +54,10 @@
enum devices{
this_device, // command applies to only this device
all_devices }; // command applies to all devices
+
+ enum {
+ invalid_conversion = -1000
+ };
/** Create a probe object connected to the specified pins
*
@@ -91,7 +95,7 @@
* probe to read its RAM, do CRC check and convert temperature on the LPC1768.
*
* @param scale, may be either 'c' or 'f'
- * @returns temperature for that scale, or -1000.0 if CRC error detected.
+ * @returns temperature for that scale, or DS1820::invalid_conversion (-1000) if CRC error detected.
*/
float temperature(char scale='c');
DS1820