Merge pull request #3128 from adafruit/pcm5122

pcm5122 hardware mode

Author: BlitzCityDIY

PCM5122_Examples/Arduino_PCM5122_HW_Mode/.feather_rp2040.test.only

@@ -0,0 +1,55 @@
+// SPDX-FileCopyrightText: 2025 Ladyada for Adafruit Industries
+//
+// SPDX-License-Identifier: MIT
+
+#include <I2S.h>
+#include <math.h>
+
+#define pBCLK D9   // BITCLOCK - I2S clock
+#define pWS   D10  // LRCLOCK - Word select
+#define pDOUT D11  // DATA - I2S data
+
+// Create I2S port
+I2S i2s(OUTPUT);
+
+const int frequency = 440; // frequency of square wave in Hz
+const int amplitude = 500; // amplitude of square wave
+const int sampleRate = 16000; // 16 KHz is a good quality
+
+const int halfWavelength = (sampleRate / frequency); // half wavelength of square wave
+
+int16_t sample = amplitude; // current sample value
+int count = 0;
+
+void setup() {
+  Serial.begin(115200);
+  while (!Serial) delay(10);
+
+  Serial.println(F("Adafruit PCM51xx Hardware Mode Test"));
+
+  // Initialize I2S peripheral
+  Serial.println("Initializing I2S...");
+  i2s.setBCLK(pBCLK);
+  i2s.setDATA(pDOUT);
+  i2s.setBitsPerSample(16);
+  
+  // Start I2S at the sample rate
+  if (!i2s.begin(sampleRate)) {
+    Serial.println("Failed to initialize I2S!");
+  }
+  
+}
+
+void loop() {
+  if (count % halfWavelength == 0) {
+    // invert the sample every half wavelength count multiple to generate square wave
+    sample = -1 * sample;
+  }
+
+  // write the same sample twice, once for left and once for the right channel
+  i2s.write(sample);
+  i2s.write(sample);
+
+  // increment the counter for the next sample
+  count++;
+}

PCM5122_Examples/Arduino_PCM5122_HW_Mode/Arduino_PCM5122_HW_Mode.ino

@@ -0,0 +1,31 @@
+# SPDX-FileCopyrightText: Copyright (c) 2025 Liz Clark for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+
+"""
+Sine tone playback test for the PCM5122 I2S DAC in hardware mode.
+"""
+
+import array
+import math
+import time
+
+import audiobusio
+import audiocore
+import board
+
+audio = audiobusio.I2SOut(board.D9, board.D10, board.D11)
+
+tone_volume = 0.5  # Increase this to increase the volume of the tone.
+frequency = 440  # Set this to the Hz of the tone you want to generate.
+length = 8000 // frequency
+sine_wave = array.array("h", [0] * length)
+for i in range(length):
+    sine_wave[i] = int((math.sin(math.pi * 2 * i / length)) * tone_volume * (2**15 - 1))
+sine_wave_sample = audiocore.RawSample(sine_wave)
+
+while True:
+    audio.play(sine_wave_sample, loop=True)
+    time.sleep(1)
+    audio.stop()
+    time.sleep(1)