codal_port/modmicrobit: Make scale return int if to-tuple is all ints.

Addresses issue #121.

Signed-off-by: Damien George <damien@micropython.org>

Author: dpgeorge

src/codal_port/modmicrobit.c

@@ -24,6 +24,7 @@
  * THE SOFTWARE.
  */
 
+#include <math.h>
 #include "py/obj.h"
 #include "py/mphal.h"
 #include "drv_softtimer.h"
@@ -152,7 +153,12 @@ STATIC mp_obj_t microbit_scale(size_t n_args, const mp_obj_t *pos_args, mp_map_t
     // Compute scaled value.
     mp_float_t to_value = (from_value - from_min) / (from_max - from_min) * (to_max - to_min) + to_min;
 
-    return mp_obj_new_float(to_value);
+    // Return float or int based on type of "to" tuple.
+    if (mp_obj_is_float(to_items[0]) || mp_obj_is_float(to_items[1])) {
+        return mp_obj_new_float(to_value);
+    } else {
+        return mp_obj_new_int(MICROPY_FLOAT_C_FUN(nearbyint)(to_value));
+    }
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_KW(microbit_scale_obj, 0, microbit_scale);