Add support for Random Number Generator initialisation #9

- Update API to allow allow definition of per device RNG seed - Update to AnalogSensor to create a valid initial sample on creation.
lancaster-university · Jan 20, 2017 · be747b2 · be747b2
1 parent 93d9b2b
commit be747b2
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Showing 2 changed files with 8 additions and 4 deletions.
diff --git a/inc/core/CodalDevice.h b/inc/core/CodalDevice.h
@@ -46,6 +46,8 @@ class CodalDevice
       */
     CodalDevice()
     {
+        if (random_value == 0)
+            random_value = 0xC0DA1;
     }
 
     /**
@@ -99,12 +101,13 @@ class CodalDevice
     /**
      * Seed the random number generator (RNG).
      *
-     * default: 0xCAFECAFE
-     * @return an unsigned 32 bit seed to seed codal's lightweight Galois LFSR.
+     * @param seed an unsigned 32 bit value used to seed codal's lightweight Galois LFSR.
+     * @return DEVICE_OK on success
      */
-    virtual uint32_t seedRandom()
+    virtual int seedRandom(uint32_t seed)
     {
-        return 0xCAFECAFE;
+        random_value = seed;
+        return DEVICE_OK;
     }
 };
 

diff --git a/source/drivers/AnalogSensor.cpp b/source/drivers/AnalogSensor.cpp
@@ -55,6 +55,7 @@ AnalogSensor::AnalogSensor(DevicePin &pin, uint16_t id) : _pin(pin)
         EventModel::defaultEventBus->listen(id, ANALOG_SENSOR_UPDATE_NEEDED, this, &AnalogSensor::onSampleEvent, MESSAGE_BUS_LISTENER_IMMEDIATE);
 
     setPeriod(500);
+    updateSample();
 }
 
 /*
-Original file line number
+Diff line change
@@ Expand Up @@
             EventModel::defaultEventBus->listen(id, ANALOG_SENSOR_UPDATE_NEEDED, this, &AnalogSensor::onSampleEvent, MESSAGE_BUS_LISTENER_IMMEDIATE);
         setPeriod(500);
+        updateSample();
     }
     /*
@@ Expand Down @@