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library

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Blame information for rev 6

Line No. Rev Author Line
1 6 kaklik //*****************************************************************************
2 // File Name : ds18b20.c
3 // Title : Dallas 1-Wire DS18B20 Temperature Sensor Library
4 // Revision : 3
5 // Notes :
6 // Target MCU : Atmel AVR series
7 // Editor Tabs : 4
8 //
9 // Revision History:
10 // When Who Rev Description of change
11 // ----------- ----------- ------- -----------------------
12 // 28-Sep-2003 rwatson 3 Added Print
13 // 27-Sep-2003 rwatson 2 Added Setup, Start, Result, StartAndResult
14 // 27-Sep-2003 rwatson 1 Created the program structure
15 //*****************************************************************************
16  
17 #ifndef ds18b20_h
18 #define ds18b20_h
19  
20 //----- Include Files ---------------------------------------------------------
21 #include "global.h"
22  
23 //----- Defines ---------------------------------------------------------------
24 #define ds18b20_rev 3
25  
26 // family code
27 #define DS18B20_FAMILY 0x28
28  
29 // function commands
30 #define DS18B20_CONVERT_TEMP 0x44
31 #define DS18B20_WRITE_SCRATCHPAD 0x4E
32 #define DS18B20_READ_SCRATCHPAD 0xBE
33 #define DS18B20_COPY_SCRATCHPAD 0x48
34 #define DS18B20_RECALL_E2 0xB8
35 #define DS18B20_READ_POWER 0xB4
36  
37 // resolution min and max
38 #define DS18B20_RES_MIN 9
39 #define DS18B20_RES_MAX 12
40  
41 // no alarm values for high and low
42 #define DS18B20_NO_ALARM_LOW -56 // min temp read is -55C
43 #define DS18B20_NO_ALARM_HIGH 126 // max temp read is 125C
44  
45 //----- Functions ---------------------------------------------------------------
46  
47 // ds18b20Init()
48 // initializes the dallas 1-wire bus
49 void ds18b20Init(void);
50  
51 // ds18b20Setup
52 // Sets up the device
53 // The parameters are the rom id of the device,
54 // the resolution [9-12], and the low and high alarm values.
55 // If no low and/or high alarm is desired, use the values -55 and/or 126
56 // Returns either the corresponding error or DALLAS_NO_ERROR
57 u08 ds18b20Setup(dallas_rom_id_T* rom_id, u08 resolution, s08 alarm_low, s08 alarm_high);
58  
59 // ds18b20Start()
60 // Start the conversion for the given device
61 // Returns either the corresponding error or DALLAS_NO_ERROR
62 u08 ds18b20Start(dallas_rom_id_T* rom_id);
63  
64 // ds18b20Result()
65 // Gets the result of the conversion and stores it in *result
66 // Returns either the corresponding error or DALLAS_NO_ERROR
67 u08 ds18b20Result(dallas_rom_id_T* rom_id, u16 *result);
68  
69 // ds18b20StartAndResult();
70 // 1-step command to start the conversion and store the result in *result
71 // The conversion takes some time to do, so it can be more efficient
72 // to do the 1-step commands Start() and Result()
73 // Returns either the corresponding error or DALLAS_NO_ERROR
74 u08 ds18b20StartAndResult(dallas_rom_id_T* rom_id, u16 *result);
75  
76 // ds18b20Print()
77 // Does a formatted print on the given resultat the given resolution: +xx x/xx
78 void ds18b20Print(u16 result, u08 resolution);
79  
80 #endif
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