Fix conversion.

Author: microbit-matt-hillsdon

src/board/conversions.ts

@@ -28,14 +28,14 @@ export function convertAudioBuffer(source: number, target: AudioBuffer) {
   return target;
 }
 
-export function convertStringToSoundThresoldNumber(
-  value: "low" | "high"
-): number {
+export function convertSoundThresholdNumberToString(
+  value: number
+): "low" | "high" {
   switch (value) {
-    case "low":
-      return MICROBIT_HAL_MICROPHONE_SET_THRESHOLD_LOW;
-    case "high":
-      return MICROBIT_HAL_MICROPHONE_SET_THRESHOLD_HIGH;
+    case MICROBIT_HAL_MICROPHONE_SET_THRESHOLD_LOW:
+      return "low";
+    case MICROBIT_HAL_MICROPHONE_SET_THRESHOLD_HIGH:
+      return "high";
     default:
       throw new Error(`Invalid value ${value}`);
   }

src/board/microphone.ts

@@ -2,7 +2,6 @@ import {
   MICROBIT_HAL_MICROPHONE_EVT_THRESHOLD_HIGH,
   MICROBIT_HAL_MICROPHONE_EVT_THRESHOLD_LOW,
 } from "./constants";
-import { convertStringToSoundEventNumber } from "./conversions";
 import { RangeSensor, State } from "./state";
 
 type SoundLevelCallback = (v: number) => void;

src/jshal.js

@@ -207,7 +207,7 @@ mergeInto(LibraryManager.library, {
 
   mp_js_hal_microphone_set_threshold: function (kind, value) {
     board.microphone.setThreshold(
-      conversions.convertStringToSoundThresoldNumber(kind),
+      conversions.convertSoundThresholdNumberToString(kind),
       value
     );
   },