From c3adf740bf4d877b8fc6b2bf1a91198a438c749e Mon Sep 17 00:00:00 2001
From: Sebastian Kujas <kujas@hfg-offenbach.de>
Date: Tue, 3 Jun 2025 16:02:52 +0200
Subject: [PATCH] ringbuffer skeleton added

---
 soundcube-firmware/ringbuffer.h           | 23 ++++++++++++++
 soundcube-firmware/soundcube-firmware.ino | 38 ++++++++++++++++++++++-
 2 files changed, 60 insertions(+), 1 deletion(-)
 create mode 100644 soundcube-firmware/ringbuffer.h

diff --git a/soundcube-firmware/ringbuffer.h b/soundcube-firmware/ringbuffer.h
new file mode 100644
index 0000000..98916cf
--- /dev/null
+++ b/soundcube-firmware/ringbuffer.h
@@ -0,0 +1,23 @@
+#pragma once
+
+template<typename T>
+class RingBuffer{
+  public:
+    RingBuffer(size_t size) : bufferSize(size) {}
+    void begin(){
+      buffer = new T[bufferSize];
+    };
+
+    bool push(T data){
+      counter++;
+    };
+    
+    T pop(){
+      counter--;
+    };
+  private:
+    size_t bufferSize = 0;
+    int counter = 0;
+    bool 
+    T buffer[];
+}
\ No newline at end of file
diff --git a/soundcube-firmware/soundcube-firmware.ino b/soundcube-firmware/soundcube-firmware.ino
index fe27ed7..740395e 100644
--- a/soundcube-firmware/soundcube-firmware.ino
+++ b/soundcube-firmware/soundcube-firmware.ino
@@ -1,3 +1,4 @@
+#include <RingBuf.h>
 #include <ArduinoJson.h>
 #include <ArduinoJson.hpp>
 
@@ -10,16 +11,20 @@
 #include <SD.h>
 #include "codec.h"
 
-
 #define HAPTIC 1
 #define AURAL 1
 #define UI_SAMPLERATE 22050
 
 #define SIZE 256
+#define RINGBUFFER 1024
 #define ECHO 96000
 int16_t buffer[SIZE];
 int16_t buffer2[ECHO];
 
+RingBuf<int16_t, RINGBUFFER> ringbuffer;
+
+File stream1;
+
 I2S i2s(INPUT_PULLUP);
 
 TLV320AIC3204 codec; 
@@ -88,6 +93,11 @@ void codec_transmit() {
   //   if(tape_read < 0) tape_read += ECHO;
   //   buffer[i] += buffer2[tape_read % ECHO];
   // }
+  
+  for(int i = 0; i < count; i++){
+    buffer[i] += ringbuffer.pop();
+  }
+  
   i2s.write((const uint8_t *)&buffer, count * sizeof(int16_t));
 }
 
@@ -126,6 +136,12 @@ void setup() {
   FastLED.addLeds<NEOPIXEL, 4>(edge_leds, 11);
   FastLED.addLeds<NEOPIXEL, 5>(ui_leds, 74);
 
+  pinMode(12, OUTPUT);
+  pinMode(13, OUTPUT);
+
+  digitalWrite(12, LOW);
+  digitalWrite(13, LOW);
+
   pinMode(21, INPUT_PULLUP);
   sd_card_detected = !digitalRead(21);
   delay(500);
@@ -218,6 +234,10 @@ void setup() {
     while(100);
   }
 
+  if(sdInitialized && SD.exists("/piano.wav")) {
+    stream1 = SD.open("/piano.wav");
+  }
+
   digitalWrite(6, HIGH);
   delay(50);
   digitalWrite(6, LOW);
@@ -236,6 +256,14 @@ void loop() {
   if(sd_card_detected) edge_leds[8] = CRGB(0,10,0);
   if(!sd_card_detected) edge_leds[8] = CRGB(10,0,0);
 
+  if(!ringbuffer.isFull()){
+    while (!ringbuffer.isFull()) {
+      int16_t sample = stream1.read();
+      ringbuffer.push(sample);
+      if(!stream1.available()) stream1.seek(0, SeekSet); 
+    }
+  }
+
   // EDGE LEDs
   for (int i = 0; i < 8; i++) {
     edge_leds[i] = CRGB(config.edge_color_r, config.edge_color_g, config.edge_color_b);
@@ -294,6 +322,14 @@ void loop() {
   // set active LED matrix LED
   ui_leds[lut_matrix[active]] = CRGB(100, 100, 100);
 
+  if(active == 1) {
+    digitalWrite(12, HIGH);
+    digitalWrite(13, HIGH);
+  } else {
+    digitalWrite(12, LOW);
+    digitalWrite(13, LOW);
+  }
+
   if(position < 0) position += 4096;
   active_led_ring = (position / 32) % 48;