tests: drivers: audio: dmic_api: Enable coverage calculation

When test is run with enabled coverage, additional RAM is required
to store coverage data.
Digital Microphone test is reserving most of the available RAM
to store audio samples. Thus, test fails to build with coverage
enabled due to RAM overflow.

Decrease size of the audio buffer when coverage is enabled.

Signed-off-by: Sebastian Głąb <sebastian.glab@nordicsemi.no>

Author: nordic-segl

tests/drivers/audio/dmic_api/src/main.c

@@ -34,8 +34,14 @@ static const struct device *dmic_dev = DEVICE_DT_GET(DT_ALIAS(dmic_dev));
 /* Milliseconds to wait for a block to be read. */
 #define READ_TIMEOUT 1000
 /* Size of a block for 100 ms of audio data. */
+#if defined(CONFIG_COVERAGE)
+/* Use smaller buffer in coverage mode. */
+#define BLOCK_SIZE(_sample_rate, _number_of_channels) \
+	(BYTES_PER_SAMPLE * (_sample_rate / 100) * _number_of_channels)
+#else
 #define BLOCK_SIZE(_sample_rate, _number_of_channels) \
 	(BYTES_PER_SAMPLE * (_sample_rate / 10) * _number_of_channels)
+#endif
 
 /* Driver will allocate blocks from this slab to receive audio data into them.
  * Application, after getting a given block from the driver and processing its