Bas van Drunen Littel / DS1621

Tested and working library for the DS1621 temperature sensor with I2C

Dependents:   condato_Coldchainlogger condato_Coldchainlogger 039847382-S3_DS1621_and_LCD_V1

ds1621.h@0:20bfb7df0470, 2012-07-06 (annotated)

Committer:
Bas
Date:
Fri Jul 06 20:51:31 2012 +0000
Revision:
0:20bfb7df0470
fixed compiler warning LastTemp

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Bas 0:20bfb7df0470 1 #ifndef __DS1621_H
Bas 0:20bfb7df0470 2 #define __DS1621_H
Bas 0:20bfb7df0470 3
Bas 0:20bfb7df0470 4 #define VERSION 1.0
Bas 0:20bfb7df0470 5
Bas 0:20bfb7df0470 6 #include <mbed.h>
Bas 0:20bfb7df0470 7
Bas 0:20bfb7df0470 8 //Temperature conversion commands
Bas 0:20bfb7df0470 9 #define READ_TEMPERATURE 0xAA
Bas 0:20bfb7df0470 10 #define READ_COUNTER 0xA8
Bas 0:20bfb7df0470 11 #define READ_SLOPE 0xA9
Bas 0:20bfb7df0470 12 #define START_CONVERT_T 0xEE
Bas 0:20bfb7df0470 13 #define STOP_CONVERT_T 0x22
Bas 0:20bfb7df0470 14
Bas 0:20bfb7df0470 15 //Thermostat commands
Bas 0:20bfb7df0470 16 #define ACCESS_TH 0xA1
Bas 0:20bfb7df0470 17 #define ACCESS_TL 0xA2
Bas 0:20bfb7df0470 18 #define ACCESS_CONFIG 0xAC
Bas 0:20bfb7df0470 19
Bas 0:20bfb7df0470 20 //Config register
Bas 0:20bfb7df0470 21 #define DONE 0x80
Bas 0:20bfb7df0470 22 #define THF 0x40
Bas 0:20bfb7df0470 23 #define TLF 0x20
Bas 0:20bfb7df0470 24 #define NVB 0x10
Bas 0:20bfb7df0470 25 #define POL 0x02
Bas 0:20bfb7df0470 26 #define ONESHOT 0x01
Bas 0:20bfb7df0470 27
Bas 0:20bfb7df0470 28 class DS1621 {
Bas 0:20bfb7df0470 29 public:
Bas 0:20bfb7df0470 30 DS1621(I2C* interface, unsigned char address);
Bas 0:20bfb7df0470 31
Bas 0:20bfb7df0470 32 // Set configuration register
Bas 0:20bfb7df0470 33 void SetConfig(unsigned char cfg);
Bas 0:20bfb7df0470 34
Bas 0:20bfb7df0470 35 // Read a DS1621 register
Bas 0:20bfb7df0470 36 unsigned char ReadReg(unsigned char reg);
Bas 0:20bfb7df0470 37
Bas 0:20bfb7df0470 38 // Sets temperature limit
Bas 0:20bfb7df0470 39 // -- works only with ACCESS_TL, and ACCESS_TH
Bas 0:20bfb7df0470 40 void SetLimit(unsigned char reg, float temp);
Bas 0:20bfb7df0470 41
Bas 0:20bfb7df0470 42 // Start/Stop DS1621 temperature conversion
Bas 0:20bfb7df0470 43 void StartConversion(bool start);
Bas 0:20bfb7df0470 44
Bas 0:20bfb7df0470 45 // Reads temperature or limit
Bas 0:20bfb7df0470 46 // -- works only with READ_TEMPERATURE, ACCESS_TL, and ACCESS_TH
Bas 0:20bfb7df0470 47 // -- for actual temperature, set ONESHOT mode off and start conversion
Bas 0:20bfb7df0470 48 // -- returns true if reg valid
Bas 0:20bfb7df0470 49 bool GetTemp(unsigned char reg, float *Temp);
Bas 0:20bfb7df0470 50
Bas 0:20bfb7df0470 51 // Read high resolution temperature
Bas 0:20bfb7df0470 52 // -- returns temperature in 1/100ths degrees
Bas 0:20bfb7df0470 53 // -- DS1621 is set in ONESHOT mode
Bas 0:20bfb7df0470 54 // -- returns true if conversion has finished, new temperature is calculated
Bas 0:20bfb7df0470 55 // -- returns false if conversion is busy, previous temperature is given
Bas 0:20bfb7df0470 56 bool GetHResTemp(float *Temp);
Bas 0:20bfb7df0470 57
Bas 0:20bfb7df0470 58 private:
Bas 0:20bfb7df0470 59 I2C* i2c; // Communication interface
Bas 0:20bfb7df0470 60 unsigned char address;
Bas 0:20bfb7df0470 61 void ReadChipTemp(unsigned char cmd, unsigned char *data);
Bas 0:20bfb7df0470 62 bool conversion_busy;
Bas 0:20bfb7df0470 63 float LastTemp;
Bas 0:20bfb7df0470 64 };
Bas 0:20bfb7df0470 65 #endif