From a16ac73d9bc3fa511ed8cb538a5a91e4bdeb37a4 Mon Sep 17 00:00:00 2001
From: Sebastian Kujas <kujas@hfg-offenbach.de>
Date: Tue, 27 May 2025 19:40:13 +0200
Subject: [PATCH] SD card working, simple config for edge led color added

---
 soundcube-firmware/soundcube-firmware.ino | 99 +++++++++++++++++++----
 1 file changed, 84 insertions(+), 15 deletions(-)

diff --git a/soundcube-firmware/soundcube-firmware.ino b/soundcube-firmware/soundcube-firmware.ino
index 41331c5..7d89681 100644
--- a/soundcube-firmware/soundcube-firmware.ino
+++ b/soundcube-firmware/soundcube-firmware.ino
@@ -1,8 +1,13 @@
+#include <ArduinoJson.h>
+#include <ArduinoJson.hpp>
+
 #include <TCA9555.h>
 #include <AS5600.h>
 #include <Adafruit_NeoPixel.h>
 #include <PWMAudio.h>
 #include <I2S.h>
+#include <SPI.h>
+#include <SD.h>
 
 #define HAPTIC 1
 #define AURAL 1
@@ -17,8 +22,8 @@ PWMAudio ui_snd(8);
 
 enum BUTTON {CVINL, CVINR, INL, INR, OUTR, OUTL, CVOUTR, CVOUTL, RIGHT, LEFT, SELECT, DEBUG1, DEBUG2, DEBUG3};
 
-Adafruit_NeoPixel edge_pixels(8, 4, NEO_GRB + NEO_KHZ800);
-Adafruit_NeoPixel ui_pixels(72, 5, NEO_GRB + NEO_KHZ800);
+Adafruit_NeoPixel edge_pixels(11, 4, NEO_GRB + NEO_KHZ800);
+Adafruit_NeoPixel ui_pixels(74, 5, NEO_GRB + NEO_KHZ800);
 
 volatile bool flag = false;
 volatile bool click = false;
@@ -29,16 +34,48 @@ int counter = 0;
 bool buttons[16] = {false};
 
 int16_t beep[UI_SAMPLERATE];
+uint16_t beep_length = 0;
+
+bool sd_card_detected = false;
+
+struct Config {
+  int edge_color_r = 0;
+  int edge_color_g = 0;
+  int edge_color_b = 50;
+};
+
+Config config;
+
+void loadConfiguration(Config& config) {
+  File file = SD.open("/config.txt");
+  JsonDocument doc;
+
+  DeserializationError error = deserializeJson(doc, file);
+  if(error) Serial.println(F("Failed to read file, using default configuration"));
+
+  config.edge_color_r = doc["edge"]["color"]["r"] | 0;
+  config.edge_color_g = doc["edge"]["color"]["g"] | 0;
+  config.edge_color_b = doc["edge"]["color"]["b"] | 50;
+  
+  //strlcpy(config.hostname, doc["hostname"] | "example.com", sizeof(config.hostname));
+
+  file.close();
+}
 
 void pwm_audio_callback() {
     while (ui_snd.availableForWrite()) {
       if(click) {
         ui_snd.write(beep[counter]);
+        counter++;
+        if(counter == beep_length) {
+          counter = 0;
+          click = false;
+        }
       } else {
+        digitalWriteFast(7, LOW);
         ui_snd.write(0);
+        counter = 0;
       }
-      counter++;
-      if(counter == UI_SAMPLERATE) counter = 0;
     }
 }
 
@@ -47,14 +84,45 @@ void tca_irq() {
 }
 
 void setup() {
-
-  for(int i = 0; i < UI_SAMPLERATE; i++){
-    float sine_pos = (2.0f * M_PI * 8000.0f * (float)i) / (float)UI_SAMPLERATE;
-    beep[i] = (int16_t)(sin(sine_pos) * 8000.0f);
+  Serial.begin();
+  while (!Serial) {
+    ;
   }
 
-  Serial.begin();
-  delay(2000);
+  pinMode(21, INPUT_PULLUP);
+  sd_card_detected = !digitalRead(21);
+  delay(500);
+
+  bool sdInitialized = SD.begin(22, 23, 24);
+  delay(100);
+  if(!sdInitialized) sdInitialized = SD.begin(22, 23, 24); // hack to prevent SD card from not initializing after soft reset
+
+  if(sdInitialized) loadConfiguration(config);
+
+  if(sdInitialized && SD.exists("/click.wav")) {
+    File click = SD.open("/click.wav");
+    int click_bytes = 0;
+    int32_t maxv = 0;
+    while (click.available() || click_bytes == UI_SAMPLERATE-1) {
+      int32_t sample = click.read() * 64;
+      if(abs(sample) > maxv) maxv = sample;
+      beep[click_bytes] = sample;
+      click_bytes++;
+    }
+    
+    beep_length = click_bytes;
+    Serial.print("Read ");
+    Serial.print(beep_length);
+    Serial.print(" bytes from click.wav into beep array. maxV was ");
+    Serial.println(maxv);
+  } else {
+    for(int i = 0; i < UI_SAMPLERATE; i++){
+      float sine_pos = (2.0f * M_PI * 8000.0f * (float)i) / (float)UI_SAMPLERATE;
+      beep[i] = (int16_t)(sin(sine_pos) * 8000.0f);
+    }
+    Serial.println("Synthesized 8kHz sine into beep array.");
+    beep_length = UI_SAMPLERATE;
+  }
 
   Serial.println("INIT WIRE");
   Wire1.setSDA(2);
@@ -114,6 +182,10 @@ void loop() {
   edge_pixels.clear();  // Set all pixel colors to 'off'
   ui_pixels.clear();    // Set all pixel colors to 'off'
   
+  sd_card_detected = !digitalRead(21);
+  if(sd_card_detected) edge_pixels.setPixelColor(8, edge_pixels.Color(0,25,0));
+  if(!sd_card_detected) edge_pixels.setPixelColor(8, edge_pixels.Color(25,0,0));
+
   position = ENC.getCumulativePosition();
 
   // if (millis() - lastTime >= 100)
@@ -147,11 +219,8 @@ void loop() {
     }
     // Make beep
     if (AURAL) {
-      digitalWrite(7, HIGH);
+      digitalWriteFast(7, HIGH);
       click = true;
-      delay(50);
-      click = false;
-      digitalWrite(7, LOW);
     }
     // Make vibration
     if(HAPTIC){
@@ -171,7 +240,7 @@ void loop() {
 
   // EDGE LEDs
   for (int i = 0; i < 8; i++) {
-    edge_pixels.setPixelColor(i, edge_pixels.Color(15, 15, 15));
+    edge_pixels.setPixelColor(i, edge_pixels.Color(config.edge_color_r, config.edge_color_g, config.edge_color_b));
   }
 
   // Rotary button LEDs