MCP9803.h

00001 /********************************************************************************************
00002 
00003    Filename: MCP9803.h
00004 
00005    Original Author: Steven Kay
00006 
00007    Development Group: Autonomous Systems Group, RAL Space
00008 
00009    Original Creation Date: April 2017
00010 
00011    Description: <Desc>
00012 
00013    Revision History: Version 1.0 - Initial Release
00014 
00015  *********************************************************************************************/
00016 
00017 #ifndef MCP9803_H
00018 #define MCP9803_H
00019 
00020 #include "mbed.h"
00021 
00022 #define SUCCESS                 0
00023 #define FAILURE                 1
00024 
00025 #define FAIL_EVEN_VALUE         0xFF
00026 #define FAIL_ODD_VALUE          0x00
00027 
00028 #define TEMP_REG_POINT          0x00
00029 #define CONFIG_REG_POINT        0x01
00030 #define TEMP_HYST_POINT         0x02
00031 #define TEMP_LIM_SET_POINT      0x03
00032 
00033 #define CONFIG_CMD_LENGTH       2
00034 #define TEMP_DATA_LENGTH        2
00035 
00036 #define READ_TEMP_FAIL_VALUE    0x0FF0
00037 #define READ_TEMP_FAIL_ERROR    -2000
00038 
00039 #define CELCIUS                 0x01
00040 #define FARENHEIT               0x02
00041 #define KELVIN                  0x03
00042 #define FORMAT_FAIL             -1000
00043 
00044 #define RAW_TO_C                0.0625
00045 #define C_F_1                   1.8
00046 #define C_F_2                   32
00047 #define C_TO_F                  273.15
00048 
00049 
00050 union CONFIG_REG
00051 {
00052     struct
00053     {
00054         unsigned int SHUTDOWN_BIT: 1;
00055         unsigned int COMP_INT_BIT: 1;
00056         unsigned int ALERT_POLARITY_BIT: 1;
00057         unsigned int FAULT_QUEUE: 2;
00058         unsigned int ADC_RES: 2;
00059         unsigned int ONE_SHOT: 1;
00060     } CONFIG_BITS;
00061     
00062     uint8_t CONFIG_VALUE;
00063 };
00064 
00065 class MCP9803
00066 {
00067     
00068 public:
00069     MCP9803(PinName sda, PinName scl, int Address, int frequency);
00070     int ConfigSensor(   int shutdown, int comp_int, int alert_polarity,
00071                         int fault_guide, int adc_res, int one_shot);
00072 
00073     
00074     int RawTempValue();
00075     float FormattedTempValue(int format);
00076 
00077 private:
00078     I2C *_I2C;
00079     int chipAddress;
00080     union CONFIG_REG CONFIG_REG_VALUE; 
00081     
00082     char *inBuffer;
00083     
00084     int I2C_Write(char *dataOut,int dataLen);
00085     char *I2C_Read(int dataLen);
00086     void setBufferSize(int dataLen); 
00087 
00088 };
00089 
00090 #endif