Characteristic.h

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00033 
00034 #ifndef __BLE_CHARACTERISTIC_H__
00035 #define __BLE_CHARACTERISTIC_H__
00036 
00037 #include "mbed.h"
00038 #include "BLE.h"
00039 
00040 /**
00041  * @class   Characteristic
00042  * @brief   Abstract characteristic class.
00043  * @details Implement sub class derived from this for custom characteristic.
00044  */
00045 class Characteristic
00046 {
00047 public:
00048 
00049     static const unsigned TIMESTAMP_BYTES = 7;
00050 
00051     virtual GattCharacteristic *getChar(void) = 0;
00052     virtual uint8_t getNumBytes(void) = 0;
00053     virtual uint8_t *getBytes(void) = 0;
00054 
00055 protected:
00056 
00057     // Convert time_t to the timestamp format
00058     static void date_time(time_t time, uint8_t *buf) {
00059         // Convert time_t to Year, Month, Day, Hour, Minute, Second
00060         struct tm ts = *localtime(&time);
00061 
00062         buf[1] = ((ts.tm_year+1900) & 0xFF00) >> 8;
00063         buf[0] = (ts.tm_year+1900) & 0xFF;
00064 
00065         buf[2] = (ts.tm_mon + 1) & 0xFF;
00066         buf[3] = ts.tm_mday & 0xFF;
00067         buf[4] = ts.tm_hour & 0xFF;
00068         buf[5] = ts.tm_min & 0xFF;
00069         buf[6] = ts.tm_sec & 0xFF;
00070     }
00071 
00072     // Convert floating point numbers to IEEE-11073 32-bit float
00073     static uint32_t float_bytes(float _float, uint8_t exp) {
00074         // Calculate how much to adjust mantissa
00075         uint8_t exponent = 0xFF - exp + 1;
00076         while(exp > 0) {
00077             _float *=10;
00078             exp--;
00079         }
00080         uint32_t mantissa = (uint32_t)(_float);
00081         return (((uint32_t)exponent) << 24) | mantissa;
00082     }
00083 };
00084 
00085 #endif /* #ifndef __BLE_CHARACTERISTIC_H__*/