wip

output_devices/I2S/hello.MAX98357A.RP2040.sample.ino

+//
+// hello.MAX98357A.RP2040.sample.ino
+//    XIAO RP2040 MAX98537A I2S amp audio sample hello-world
+//
+// Neil Gershenfeld 11/7/24
+//
+// This work may be reproduced, modified, distributed,
+// performed, and displayed for any purpose, but must
+// acknowledge this project. Copyright is retained and
+// must be preserved. The work is provided as is; no
+// warranty is provided, and users accept all liability.
+//
+
+#include <I2S.h>
+#include "hello.h"
+
+#define clock 1
+#define frame (clock+1)
+#define data 4
+#define sample_frequency 44100
+#define sample_length 40876
+#define sample_bits 16
+#define sample_scale 0.1
+#define fade 10000
+
+I2S i2s(OUTPUT);
+
+void setup() {
+  i2s.setBCLK(clock);
+  i2s.setDATA(data);
+  i2s.setBitsPerSample(sample_bits);
+  i2s.begin(sample_frequency);
+  }
+
+void loop() {
+  int32_t sample;
+  //
+  // loop over samples
+  //
+  for (int i = 0; i < sample_length; ++i) {
+    //
+    // output left and right channels, fading out
+    //
+    if (i > (sample_length-fade))
+      sample = ((sample_length-i-1)/(fade-1))*sample_scale*hello[i];
+    else
+      sample = sample_scale*hello[i];
+    i2s.write(sample);
+    i2s.write(sample);
+    }
+  delay(500);
+  }
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