Alastair D'Silva / DS1820

A cut-down version of https://os.mbed.com/users/Sissors/code/DS1820/ tweaked for use with the STM32F103. It is all generic Mbed operations though, so should be usable anywhere. Non-essential functions have been removed, as this is intended for use within a tutorial.

Dependencies:   LinkedList

Dependents:   STM32F103C8T6_DS18B20 stm32f103c8t6-ds18b20

Fork of DS1820 by Erik -

Files at this revision

API Documentation at this revision

Revision 12:196e9e54b033, committed 2015-02-26

Comitter:
Sissors
Date:
Thu Feb 26 22:20:24 2015 +0000
Parent:
11:1a3c3002b50c
Child:
13:51a5011dc0ad
Commit message:
Fixed issue with multplie probes
;
; The command byte got garbled after first sent, resulting in other runs no probes responding.

Changed in this revision

DS1820.cpp Show annotated file Show diff for this revision Revisions of this file 
--- a/DS1820.cpp	Mon Feb 16 16:53:11 2015 +0000
+++ b/DS1820.cpp	Thu Feb 26 22:20:24 2015 +0000
@@ -117,9 +117,10 @@
         } else {
             ROM_bit_index=1;
             descrepancy_marker=0;
+            char command_shift = command;
             for (int n=0; n<8; n++) {           // Search ROM command or Search Alarm command
-                onewire_bit_out(pin, command & 0x01);
-                command = command >> 1; // now the next bit is in the least sig bit position.
+                onewire_bit_out(pin, command_shift & 0x01);
+                command_shift = command_shift >> 1; // now the next bit is in the least sig bit position.
             } 
             byte_counter = 0;
             bit_mask = 0x01;