format sdcard test

Author: FoamyGuy

tests/circuitpython-manual/audio_i2sin/i2sin_record_sdcard.py

@@ -57,14 +57,18 @@ def write_wav_header(f, sample_rate, num_samples, bits_per_sample=16, channels=1
     f.write(struct.pack("<I", 36 + data_size))
     f.write(b"WAVE")
     f.write(b"fmt ")
-    f.write(struct.pack("<IHHIIHH",
-                        16,            # fmt chunk size
-                        1,             # PCM
-                        channels,
-                        sample_rate,
-                        byte_rate,
-                        block_align,
-                        bits_per_sample))
+    f.write(
+        struct.pack(
+            "<IHHIIHH",
+            16,  # fmt chunk size
+            1,  # PCM
+            channels,
+            sample_rate,
+            byte_rate,
+            block_align,
+            bits_per_sample,
+        )
+    )
     f.write(b"data")
     f.write(struct.pack("<I", data_size))
 
@@ -85,9 +89,9 @@ def write_wav_header(f, sample_rate, num_samples, bits_per_sample=16, channels=1
         # is already a serviceable 16-bit PCM representation.
         for i in range(n):
             v = raw[i]
-            s = v >> 16          # take top 16 bits
+            s = v >> 16  # take top 16 bits
             if s & 0x8000:
-                s -= 0x10000     # sign-extend
+                s -= 0x10000  # sign-extend
             pcm16[i] = s
         # Write only the valid portion.
         f.write(memoryview(pcm16)[:n])