Migrate all ESP32 envs to Arduino-ESP32 3.x (pioarduino)

The registry espressif32 platform still ships Arduino core 2.0.17, which
lacks ESP32-C6 support. Switch every ESP32 env to the pioarduino fork
(Arduino-ESP32 3.x) via a shared ${common.platform_esp32} variable and
consolidate shared settings into [env].

Rewrite the PWM code for the 3.x LEDC API:
- ledcSetup + ledcAttachPin -> ledcAttach(pin, freq, res)
- ledcDetachPin -> ledcDetach
- ledcWrite now addresses PWM by pin instead of channel index

Adds the esp32-c6-devkitc-1 env; all four ESP32 envs build clean.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

platformio.ini

@@ -8,37 +8,43 @@
 ; Please visit documentation for the other options and examples
 ; https://docs.platformio.org/page/projectconf.html
 
+[common]
+; All ESP32 targets use the pioarduino fork, which ships Arduino-ESP32 3.x
+; (the registry espressif32 platform is still on 2.0.17 and lacks C6 support).
+platform_esp32 = https://github.com/pioarduino/platform-espressif32/releases/download/55.03.39/platform-espressif32.zip
+
 [env]
+framework = arduino
+monitor_speed = 115200
+lib_deps =
+    tzapu/WiFiManager@^2.0.17
+    bblanchon/ArduinoJson@^7.4.3
+    knolleary/PubSubClient@^2.8
 
 [env:esp32-s3-devkitc-1]
-platform = espressif32
+platform = ${common.platform_esp32}
 board = esp32-s3-devkitc-1
-framework = arduino
-monitor_speed = 115200
 board_build.filesystem = littlefs
-lib_deps =
-    tzapu/WiFiManager@^2.0.17
-    bblanchon/ArduinoJson@^7.0.0
-    knolleary/PubSubClient@^2.8
 
 [env:esp32dev]
+platform = ${common.platform_esp32}
 board = esp32dev
-framework = arduino
-platform = espressif32
-monitor_speed = 115200
 board_build.filesystem = littlefs
-lib_deps =
-    tzapu/WiFiManager@^2.0.17
-    bblanchon/ArduinoJson@^7.4.3
-    knolleary/PubSubClient@^2.8
 
 [env:esp32-C3-devkitm-1]
+platform = ${common.platform_esp32}
 board = esp32-c3-devkitm-1
-framework = arduino
-platform = espressif32
-monitor_speed = 115200
 board_build.filesystem = littlefs
-lib_deps =
+
-    tzapu/WiFiManager@^2.0.17
+[env:esp32-c6-devkitc-1]
-    bblanchon/ArduinoJson@^7.4.3
+platform = ${common.platform_esp32}
-    knolleary/PubSubClient@^2.8
+board = esp32-c6-devkitc-1
+board_build.filesystem = littlefs
+
+[env:rpipico2w]
+; RP2350 support requires the maxgerhardt fork of the raspberrypi platform
+; and the earlephilhower arduino-pico core.
+platform = https://github.com/maxgerhardt/platform-raspberrypi.git
+board = rpipico2w
+board_build.core = earlephilhower
+board_build.filesystem_size = 0.5m

src/main.cpp

@@ -152,7 +152,7 @@ static void attachMeters() {
 
     // Release the channel if it's no longer used or its pin changed.
     if (attachedPin[i] != -1 && attachedPin[i] != pin) {
-      ledcDetachPin(attachedPin[i]);
+      ledcDetach(attachedPin[i]);
       pinMode(attachedPin[i], OUTPUT);
       digitalWrite(attachedPin[i], LOW);  // drive freed pin low so the meter reads zero
       Serial.printf("[PWM] detach ch%d pin%d\n", i, attachedPin[i]);
@@ -160,8 +160,7 @@ static void attachMeters() {
     }
 
     if (pin > 0 && attachedPin[i] != pin) {
-      ledcSetup(i, PWM_FREQ, PWM_RES);
+      ledcAttach(pin, PWM_FREQ, PWM_RES);
-      ledcAttachPin(pin, i);
       attachedPin[i] = pin;
       Serial.printf("[PWM] attach ch%d pin%d\n", i, pin);
     }
@@ -173,7 +172,7 @@ static void applyMeters() {
     if (meters[i].pin <= 0 || meters[i].maxDuty <= 0) continue;
     float pct = meters[i].currentValue / 100.0f * meters[i].maxDuty / 100.0f;
     int duty = constrain((int)(pct * 1023), 0, 1023);
-    ledcWrite(i, duty);
+    ledcWrite(meters[i].pin, duty);
     Serial.printf("[PWM] ch%d duty=%d (cur=%.1f maxD=%.1f)\n", i, duty, meters[i].currentValue, meters[i].maxDuty);
   }
 }
@@ -222,7 +221,7 @@ static void mqttCallback(char* topic, byte* payload, unsigned int len) {
     meters[idx].currentValue = physicalToPct(val, idx);
     if (meters[idx].pin > 0 && meters[idx].maxDuty > 0) {
       float pct = meters[idx].currentValue / 100.0f * meters[idx].maxDuty / 100.0f;
-      ledcWrite(idx, constrain((int)(pct * 1023), 0, 1023));
+      ledcWrite(meters[idx].pin, constrain((int)(pct * 1023), 0, 1023));
     }
     mqttPublishCurrent(idx);
   }
@@ -432,6 +431,15 @@ static void handleRoot() {
   if (!requireAuth()) { Serial.println("[HTTP] GET / -> 401"); return; }
   Serial.println("[HTTP] GET /");
   String meterRows;
+  bool useTabs = meterCount > 1;
+  if (useTabs) {
+    meterRows += "<div class=tabs><div class=tab-nav>";
+    for (int i = 0; i < meterCount; i++) {
+      String label = strlen(meters[i].name) > 0 ? escHtml(meters[i].name) : "Meter " + String(i);
+      meterRows += "<button type=button class=tab-btn" + String(i == 0 ? " active" : "") + " data-tab=" + String(i) + ">" + label + "</button>";
+    }
+    meterRows += "</div>";
+  }
   for (int i = 0; i < meterCount; i++) {
     char maxStr[8], curStr[8];
     dtostrf(meters[i].maxDuty, 1, 1, maxStr);
@@ -443,7 +451,9 @@ static void handleRoot() {
     dtostrf(meters[i].rangeMin, 1, 1, rMinStr);
     dtostrf(meters[i].rangeMax, 1, 1, rMaxStr);
 
-    meterRows += "<fieldset><legend>Meter " + String(i) + "</legend>";
+    if (useTabs) meterRows += "<div class=tab-panel" + String(i == 0 ? " active" : "") + " data-tab=" + String(i) + ">";
+    meterRows += "<fieldset>";
+    if (!useTabs) meterRows += "<legend>Meter " + String(i) + "</legend>";
     meterRows += "<div class=row><label>Pin</label><input name=m" + String(i) + "_pin type=number min=0 max=99 value=" + String(meters[i].pin) + "></div>";
     meterRows += "<div class=row><label>Name</label><input name=m" + String(i) + "_name value='" + nameVal + "'></div>";
     meterRows += "<div class=row><label>Unit</label><input name=m" + String(i) + "_unit value='" + unitVal + "'></div>";
@@ -455,7 +465,9 @@ static void handleRoot() {
     meterRows += "<input name=m" + String(i) + "_cur type=range min=0 max=100 step=0.1 value=" + String(curStr) + ">";
     meterRows += "<span class=val id=m" + String(i) + ">" + String(curStr) + "%</span>";
     meterRows += "</div></fieldset>";
+    if (useTabs) meterRows += "</div>";
   }
+  if (useTabs) meterRows += "</div>";
 
   String countOpts;
   for (int i = 1; i <= MAX_METERS; i++) {
@@ -536,7 +548,11 @@ static void handleRoot() {
 html += ".tgl-lbl{margin-bottom:0!important;line-height:18px}.switch{position:relative;display:inline-block;width:32px;height:18px;margin-left:auto;flex-shrink:0}fieldset .row label.switch{width:32px}";
 html += ".switch input{opacity:0;width:0;height:0}.slid{position:absolute;cursor:pointer;top:0;left:0;right:0;bottom:0;background:#ccc;border-radius:18px;transition:.3s}";
 html += ".slid::before{content:\"\";position:absolute;height:14px;width:14px;left:2px;top:2px;background:#fff;border-radius:50%;transition:.3s;box-shadow:0 1px 3px rgba(0,0,0,.2)}";
-html += ".switch input:checked+.slid{background:#4361ee}.switch input:checked+.slid::before{transform:translateX(14px)}";
+  html += ".switch input:checked+.slid{background:#4361ee}.switch input:checked+.slid::before{transform:translateX(14px)}";
+  html += ".tab-nav{display:flex;gap:4px;margin-bottom:16px;flex-wrap:wrap}";
+  html += ".tab-btn{padding:8px 16px;border:1px solid #d1d5db;background:#f8f9fc;border-radius:8px 8px 0 0;cursor:pointer;font-size:13px;font-weight:600;color:#666;transition:all .2s;font-family:inherit}";
+  html += ".tab-btn:hover{background:#e8eaf0}.tab-btn.active{background:#fff;border-color:#4361ee;color:#4361ee;border-bottom-color:#fff}";
+  html += ".tab-panel{display:none}.tab-panel.active{display:block}";
   html += "</style></head><body><div class=card>";
   html += "<div class=hdr><img src=/logo.png alt=logo><div><h1>M1730</h1><div class=sub>Configuration</div></div></div><div class=info>";
   html += "<div><span>Hostname</span><span>" + String(hostname) + "</span></div>";
@@ -561,6 +577,9 @@ html += ".switch input:checked+.slid{background:#4361ee}.switch input:checked+.s
   html += "x.open('GET','/set?i='+this.name.match(/\\d+/)[0]+'&v='+this.value,true);x.send();";
   html += "});}});";
   html += "document.querySelector('select[name=meter_count]').addEventListener('change',function(){this.form.submit();});";
+  if (meterCount > 1) {
+    html += "document.querySelectorAll('.tab-btn').forEach(function(b){b.addEventListener('click',function(){var t=this.dataset.tab;document.querySelectorAll('.tab-btn').forEach(function(x){x.classList.remove('active')});document.querySelectorAll('.tab-panel').forEach(function(x){x.classList.remove('active')});this.classList.add('active');document.querySelector('.tab-panel[data-tab=\"'+t+'\"]').classList.add('active')})});";
+  }
   html += "</script></body></html>";
   server.send(200, "text/html", html);
   Serial.printf("[HTTP] GET / -> 200 (%u bytes)\n", html.length());
@@ -666,7 +685,7 @@ static void handleSet() {
   if (meters[idx].pin > 0 && meters[idx].maxDuty > 0) {
     float pct = val / 100.0f * meters[idx].maxDuty / 100.0f;
     int duty = constrain((int)(pct * 1023), 0, 1023);
-    ledcWrite(idx, duty);
+    ledcWrite(meters[idx].pin, duty);
   }
   mqttPublishCurrent(idx);
   server.send(200);
@@ -743,8 +762,7 @@ static void factoryReset(bool clearWifi) {
   // Attach meters temporarily for the sweep acknowledgement
   for (int i = 0; i < count && i < 8; i++) {
     if (meters[i].pin > 0) {
-      ledcSetup(i, PWM_FREQ, PWM_RES);
+      ledcAttach(meters[i].pin, PWM_FREQ, PWM_RES);
-      ledcAttachPin(meters[i].pin, i);
     }
   }
 
@@ -756,7 +774,7 @@ static void factoryReset(bool clearWifi) {
       for (int i = 0; i < count && i < 8; i++) {
         if (meters[i].pin > 0 && meters[i].maxDuty > 0) {
           float duty = pct / 100.0f * meters[i].maxDuty / 100.0f;
-          ledcWrite(i, constrain((int)(duty * 1023), 0, 1023));
+          ledcWrite(meters[i].pin, constrain((int)(duty * 1023), 0, 1023));
         }
       }
       delay(50);
@@ -796,6 +814,11 @@ static void applyFactoryResetIfNeeded(int count) {
 void setup() {
   Serial.begin(115200);
   Serial.println("\n\n=== M1730 boot ===");
+  Serial.printf("[BOOT] chip=%s rev=%d cores=%d cpu=%dMHz flash=%uMB\n",
+                ESP.getChipModel(), ESP.getChipRevision(), ESP.getChipCores(),
+                ESP.getCpuFreqMHz(), ESP.getFlashChipSize() / (1024 * 1024));
+  Serial.printf("[BOOT] free heap=%u sketch=%u / %u\n",
+                ESP.getFreeHeap(), ESP.getSketchSize(), ESP.getFreeSketchSpace());
   if (!LittleFS.begin(false)) {
     Serial.println("[FS] mount failed, formatting...");
     LittleFS.begin(true);
@@ -809,6 +832,14 @@ void setup() {
   loadConfig();
   hostnameParam.setValue(hostname, sizeof(hostname) - 1);
 
+  for (int i = 0; i < meterCount; i++)
+    Serial.printf("[BOOT] meter[%d] pin=%d name=\"%s\" unit=\"%s\" maxD=%.1f range=[%.1f,%.1f] cur=%.1f\n",
+                  i, meters[i].pin, meters[i].name, meters[i].unit,
+                  meters[i].maxDuty, meters[i].rangeMin, meters[i].rangeMax, meters[i].currentValue);
+  Serial.printf("[BOOT] mqtt=%d broker=%s:%d prefix=%s\n",
+                mqttCfg.enabled, mqttCfg.host, mqttCfg.port, mqttCfg.prefix);
+  Serial.printf("[BOOT] auth=%d\n", authCfg.enabled);
+
   int resetCount = incrementResetCount();
 
   attachMeters();
@@ -834,7 +865,8 @@ void setup() {
     Serial.println("[WIFI] failed, restarting");
     ESP.restart();
   }
-  Serial.printf("[WIFI] connected, IP: %s\n", WiFi.localIP().toString().c_str());
+  Serial.printf("[WIFI] connected, IP: %s MAC: %s RSSI: %d\n",
+                WiFi.localIP().toString().c_str(), WiFi.macAddress().c_str(), WiFi.RSSI());
 
   strlcpy(hostname, hostnameParam.getValue(), sizeof(hostname));
   saveConfig();
@@ -844,6 +876,7 @@ void setup() {
 
   Serial.printf("[BOOT] ready at http://%s.local or http://%s\n",
                 hostname, WiFi.localIP().toString().c_str());
+  Serial.printf("[BOOT] free heap=%u\n", ESP.getFreeHeap());
 }
 
 void loop() {