samples: amp_audio_loopback: Change sample rate and initial block count

Decrease the sample frequency to 16 kHz to accomodate memory
constraints. As the SAI driver in RX mode requires more than a certain
amount of blocks to be free, change count of those prefilled.

Signed-off-by: Vit Stanicek <[email protected]>

Author: VitekST

samples/boards/nxp/adsp/rtxxx/amp_audio_loopback/remote/src/main.c

@@ -14,7 +14,7 @@
 #define I2S_RX_NODE  DT_ALIAS(i2s_rx)
 #define I2S_TX_NODE  DT_ALIAS(i2s_tx)
 
-#define SAMPLE_FREQUENCY    48000
+#define SAMPLE_FREQUENCY    16000
 #define SAMPLE_BIT_WIDTH    16
 #define BYTES_PER_SAMPLE    sizeof(int16_t)
 #define NUMBER_OF_CHANNELS  2
@@ -24,7 +24,7 @@
 #define TIMEOUT             1000
 
 #define BLOCK_SIZE  (BYTES_PER_SAMPLE * SAMPLES_PER_BLOCK)
-#define BLOCK_COUNT (INITIAL_BLOCKS + 2)
+#define BLOCK_COUNT (INITIAL_BLOCKS + 4)
 K_MEM_SLAB_DEFINE_STATIC(mem_slab, BLOCK_SIZE, BLOCK_COUNT, 4);
 
 static bool configure_streams(const struct device *i2s_dev_rx,