add support for BMA150

Author: jcw

Ports.cpp

@@ -641,6 +641,15 @@ const int* GravityPlug::getAxes() {
     return data.w;
 }
 
+char GravityPlug::temperature() {
+    send();
+    write(0x08);
+    receive();
+    char temp = read(1) - 60;
+    stop();
+    return temp;
+}
+
 /** Select the channel on the multiplexer.
  *  @param channel A number between 0..15.
  */

Ports.h

@@ -535,6 +535,9 @@ class GravityPlug : public DeviceI2C {
     /// Get accelleration data from GravityPlug.
     /// @return An array with 3 integers. (x,y,z) respectively.
     const int* getAxes();
+    /// Read out the temperature (only for BMA150, not the older BMA020)
+    /// @return temp, in half deg C steps, from -30C to +50C (i.e. times 2)
+    char temperature();
 };
 
 /// Interface for the Input Plug - see http://jeelabs.org/ip

examples/Ports/gravity_demo/gravity_demo.ino

@@ -8,24 +8,42 @@ PortI2C myBus (1);
 GravityPlug sensor (myBus);
 MilliTimer measureTimer;
 
+struct {
+  int axes[3];
+  int temp;
+} payload;
+
 void setup () {
     Serial.begin(57600);
     Serial.println("\n[gravity_demo]");
-    rf12_initialize(7, RF12_868MHZ, 5);
+
+    if (sensor.isPresent()) {
+      Serial.print("sensor version ");
+      sensor.send();
+      sensor.write(0x01);
+      sensor.receive();
+      Serial.println(sensor.read(1), HEX);
+      sensor.stop();
+    }
+
+    rf12_initialize(7, RF12_868MHZ, 42);
     sensor.begin();
 }
 
 void loop () {
     if (measureTimer.poll(1000)) {
-        const int* p = sensor.getAxes();
+        memcpy(payload.axes, sensor.getAxes(), sizeof payload.axes);
+        payload.temp = sensor.temperature();
 
-        rf12_sendNow(0, p, 3 * sizeof *p);
+        rf12_sendNow(0, &payload, sizeof payload);
 
         Serial.print("GRAV ");
-        Serial.print(p[0]);
+        Serial.print(payload.axes[0]);
+        Serial.print(' ');
+        Serial.print(payload.axes[1]);
         Serial.print(' ');
-        Serial.print(p[1]);
+        Serial.print(payload.axes[2]);
         Serial.print(' ');
-        Serial.println(p[2]);
+        Serial.println(payload.temp);
     }
 }