LTR559: Lux as float.

Avoid truncating Lux to uint16_t.

drivers/ltr559/ltr559.cpp

@@ -148,7 +148,7 @@ namespace pimoroni {
       float lux = ((int32_t)data.als0 * ch0_c[ch_idx]) - ((int32_t)data.als1 * ch1_c[ch_idx]);
       lux /= (float)this->data.integration_time / 100.0f;
       lux /= (float)this->data.gain;
-      data.lux = (uint16_t)(lux / 10000.0f);
+      data.lux = lux / 10000.0f;
     }
 
     return has_updated;

drivers/ltr559/ltr559.hpp

@@ -94,7 +94,7 @@ namespace pimoroni {
 	  uint16_t integration_time;
 	  uint16_t gain;
 	  float ratio;
-    uint16_t lux;
+    float lux;
   } ltr559_reading;
 
   class lookup {

examples/breakout_ltr559/demo.cpp

@@ -25,7 +25,7 @@ int main() {
   while(true){
     bool new_data = ltr559.get_reading();
     if(new_data) {
-      printf("Lux: %d Prox: %d\n", ltr559.data.lux, ltr559.data.proximity);
+      printf("Lux: %.2f Prox: %d\n", ltr559.data.lux, ltr559.data.proximity);
     }
     sleep_ms(100);
   };

micropython/modules/breakout_ltr559/breakout_ltr559.cpp

@@ -72,7 +72,7 @@ mp_obj_t BreakoutLTR559_get_reading(mp_obj_t self_in) {
         tuple[INTEGRATION_TIME] = mp_obj_new_int(data.integration_time);
         tuple[GAIN] = mp_obj_new_int(data.gain);
         tuple[RATIO] = mp_obj_new_float(data.ratio);
-        tuple[LUX] = mp_obj_new_int(data.lux);
+        tuple[LUX] = mp_obj_new_float(data.lux);
 
         return mp_obj_new_tuple(7, tuple);
     }