arduino examples

Author: BlitzCityDIY

PCM510x_Examples/Arduino_Audio_Playback/.feather_rp2040.test.only

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+// SPDX-FileCopyrightText: 2023 Ladyada for Adafruit Industries
+//
+// SPDX-License-Identifier: MIT
+
+/*
+  This example plays a 'raw' PCM file from memory to I2S
+*/
+
+#include <I2S.h>
+
+#include "startup.h" // audio file in flash
+
+// Create the I2S port using a PIO state machine
+I2S i2s(OUTPUT);
+
+// GPIO pin numbers on Feather RP2040
+#define pBCLK D9 // BITCLOCK
+#define pWS   D10 // LRCLOCK
+#define pDOUT D11 // DATA
+
+void setup() {
+  Serial.begin(115200);
+  while (!Serial) delay(10);
+  Serial.println("I2S playback demo");
+}
+
+void loop() {
+}
+
+void setup1() {
+  i2s.setBCLK(pBCLK);
+  i2s.setDATA(pDOUT);
+  i2s.setBitsPerSample(16);
+}
+
+void loop1() {
+  // the main loop will tell us when it wants us to play!
+    play_i2s(startupAudioData, sizeof(startupAudioData), startupSampleRate);
+    delay(1000);
+}
+
+void play_i2s(const uint8_t *data, uint32_t len, uint32_t rate) {
+  // start I2S at the sample rate with 16-bits per sample
+  if (!i2s.begin(rate)) {
+    Serial.println("Failed to initialize I2S!");
+    delay(500);
+    i2s.end();
+    return;
+  }
+  
+  for(uint32_t i=0; i<len; i++) {
+    uint16_t sample = (uint16_t)data[i] << 6; // our data is 10 bit but we want 16 bit so we add some gain
+    // write the same sample twice, once for left and once for the right channel
+    i2s.write(sample);
+    i2s.write(sample);
+  }
+  i2s.end();
+}