Diff: HTS221.h

Revision:

0:9d5134074d84

Child:

11:e6602513730f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/HTS221.h	Fri Jul 08 23:52:38 2016 +0000
@@ -0,0 +1,92 @@
+
+#ifndef HTS221_H_
+#define HTS221_H_
+
+class HTS221 {
+public:
+    HTS221(void);
+    int begin(void);
+    int activate(void);
+    int deactivate(void);
+
+    int bduActivate(void);
+    int bduDeactivate(void);
+
+    int readHumidity(void);
+    double readTemperature(void);
+private:
+    int storeCalibration(void);
+    unsigned char _h0_rH, _h1_rH;
+    unsigned int  _T0_degC, _T1_degC;
+    unsigned int  _H0_T0, _H1_T0;
+    unsigned int  _T0_OUT, _T1_OUT;
+    double _temperature;
+    int _humidity;
+    unsigned char _address;
+
+    unsigned char readRegister(unsigned char slaveAddress, unsigned char regToRead);
+    int writeRegister(unsigned char slaveAddress, unsigned char regToWrite, unsigned char dataToWrite);
+};
+
+#define HTS221_ADDRESS     0x5F
+
+//Define a few of the registers that we will be accessing on the HTS221
+#define WHO_AM_I           0x0F
+#define WHO_AM_I_RETURN    0xBC //This read-only register contains the device identifier, set to BCh
+
+#define AVERAGE_REG        0x10 // To configure humidity/temperature average.
+#define AVERAGE_DEFAULT    0x1B
+
+/*
+ * [7] PD: power down control
+ * (0: power-down mode; 1: active mode)
+ *
+ * [6:3] Reserved
+ *
+ * [2] BDU: block data update
+ * (0: continuous update; 1: output registers not updated until MSB and LSB reading)
+The BDU bit is used to inhibit the output register update between the reading of the upper
+and lower register parts. In default mode (BDU = ?0?), the lower and upper register parts are
+updated continuously. If it is not certain whether the read will be faster than output data rate,
+it is recommended to set the BDU bit to ?1?. In this way, after the reading of the lower (upper)
+register part, the content of that output register is not updated until the upper (lower) part is
+read also.
+ *
+ * [1:0] ODR1, ODR0: output data rate selection (see table 17)
+ */
+#define CTRL_REG1          0x20
+#define POWER_UP           0x80
+#define BDU_SET            0x4
+#define ODR0_SET           0x1   // setting sensor reading period 1Hz
+
+#define CTRL_REG2          0x21
+#define CTRL_REG3          0x22
+#define REG_DEFAULT        0x00
+
+#define STATUS_REG         0x27
+#define TEMPERATURE_READY  0x1
+#define HUMIDITY_READY     0x2
+
+#define HUMIDITY_L_REG     0x28
+#define HUMIDITY_H_REG     0x29
+#define TEMP_L_REG         0x2A
+#define TEMP_H_REG         0x2B
+/*
+ * calibration registry should be read for temperature and humidity calculation.
+ * Before the first calculation of temperature and humidity,
+ * the master reads out the calibration coefficients.
+ * will do at init phase
+ */
+#define CALIB_START        0x30
+#define CALIB_END          0x3F
+/*
+#define CALIB_T0_DEGC_X8   0x32
+#define CALIB_T1_DEGC_X8   0x33
+#define CALIB_T1_T0_MSB    0x35
+#define CALIB_T0_OUT_L     0x3C
+#define CALIB_T0_OUT_H     0x3D
+#define CALIB_T1_OUT_L     0x3E
+#define CALIB_T1_OUT_H     0x3F
+ */
+ 
+#endif