src: Add test recording program.

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

Author: dpgeorge

src/test_record.py

@@ -0,0 +1,57 @@
+from microbit import *
+
+mouth_open = Image(
+    "09090:"
+    "00000:"
+    "09990:"
+    "90009:"
+    "09990"
+)
+mouth_closed = Image(
+    "09090:"
+    "00000:"
+    "00000:"
+    "99999:"
+    "00000"
+)
+play = Image(
+    "00000:"
+    "04740:"
+    "07970:"
+    "04740:"
+    "00000"
+)
+
+RECORDING_RATE = 7812
+RECORDING_SECONDS = 5
+RECORDING_SIZE = RECORDING_RATE * RECORDING_SECONDS
+
+my_recording = audio.AudioFrame(RECORDING_SIZE)
+
+while True:
+    if button_a.is_pressed():
+        microphone.record_into(my_recording, rate=RECORDING_RATE, wait=False)
+        display.show([mouth_open, mouth_closed], loop=True, wait=False, delay=150)
+        while button_a.is_pressed() and microphone.is_recording():
+            sleep(50)
+        microphone.stop_recording()
+        display.show(mouth_closed)
+        while button_a.is_pressed():
+            sleep(50)
+        display.clear()
+        my_recording *= 5
+    if button_b.is_pressed():
+        audio.play(my_recording, wait=False)
+        level = 0
+        while audio.is_playing():
+            l = audio.sound_level()
+            if l > level:
+                level = l
+            else:
+                level *= 0.95
+            display.show(play * min(1, level / 100))
+            x = accelerometer.get_x()
+            audio.set_rate(max(2250, scale(x, (-1000, 1000), (2250, 13374))))
+            sleep(5)
+        display.clear()
+    sleep(100)