Esp32 s3 touch fix

wled00/button.cpp

@@ -99,9 +99,13 @@ bool isButtonPressed(uint8_t i)
     case BTN_TYPE_TOUCH:
     case BTN_TYPE_TOUCH_SWITCH:
       #if defined(ARDUINO_ARCH_ESP32) && !defined(CONFIG_IDF_TARGET_ESP32C3)
-      if (digitalPinToTouchChannel(btnPin[i]) >= 0 && touchRead(pin) <= touchThreshold) return true;
+        #ifdef SOC_TOUCH_VERSION_2 //ESP32 S2 and S3 provide a function to check touch state (state is updated in interrupt)
+        if (touchInterruptGetLastStatus(pin)) return true;
+        #else
+        if (digitalPinToTouchChannel(btnPin[i]) >= 0 && touchRead(pin) <= touchThreshold) return true;
+        #endif
       #endif
-      break;
+     break;
   }
   return false;
 }
@@ -406,3 +410,8 @@ void handleIO()
     offMode = true;
   }
 }
+
+void IRAM_ATTR touchButtonISR()
+{
+  // used for ESP32 S2 and S3: nothing to do, ISR is just used to update registers of HAL driver
+}

wled00/cfg.cpp

@@ -228,6 +228,7 @@ bool deserializeConfig(JsonObject doc, bool fromFS) {
 
   // read multiple button configuration
   JsonObject btn_obj = hw["btn"];
+  CJSON(touchThreshold, btn_obj[F("tt")]);
   bool pull = btn_obj[F("pull")] | (!disablePullUp); // if true, pullup is enabled
   disablePullUp = !pull;
   JsonArray hw_btn_ins = btn_obj["ins"];
@@ -252,6 +253,13 @@ bool deserializeConfig(JsonObject doc, bool fromFS) {
           btnPin[s] = -1;
           pinManager.deallocatePin(pin,PinOwner::Button);
         }
+        //if touch pin, enable the touch interrupt on ESP32 S2 & S3
+        #ifdef SOC_TOUCH_VERSION_2    // ESP32 S2 and S3 have a fucntion to check touch state but need to attach an interrupt to do so
+        if ((buttonType[s] == BTN_TYPE_TOUCH || buttonType[s] == BTN_TYPE_TOUCH_SWITCH)) 
+        {
+          touchAttachInterrupt(btnPin[s], touchButtonISR, 256 + (touchThreshold << 4)); // threshold on Touch V2 is much higher (1500 is a value given by Espressif example, I measured changes of over 5000)
+        }
+        #endif 
         else
       #endif
         {
@@ -299,7 +307,7 @@ bool deserializeConfig(JsonObject doc, bool fromFS) {
       }
     }
   }
-  CJSON(touchThreshold,btn_obj[F("tt")]);
+
   CJSON(buttonPublishMqtt,btn_obj["mqtt"]);
 
   int hw_ir_pin = hw["ir"]["pin"] | -2; // 4

wled00/fcn_declare.h

@@ -20,6 +20,7 @@ void doublePressAction(uint8_t b=0);
 bool isButtonPressed(uint8_t b=0);
 void handleButton();
 void handleIO();
+void IRAM_ATTR touchButtonISR();
 
 //cfg.cpp
 bool deserializeConfig(JsonObject doc, bool fromFS = false);

wled00/set.cpp

@@ -108,6 +108,10 @@ void handleSettingsSet(AsyncWebServerRequest *request, byte subPage)
     for (uint8_t s=0; s<WLED_MAX_BUTTONS; s++) {
       if (btnPin[s]>=0 && pinManager.isPinAllocated(btnPin[s], PinOwner::Button)) {
         pinManager.deallocatePin(btnPin[s], PinOwner::Button);
+        #ifdef SOC_TOUCH_VERSION_2 // ESP32 S2 and S3 have a function to check touch state, detach interrupt
+        if (digitalPinToTouchChannel(btnPin[s]) >= 0) // if touch capable pin
+          touchDetachInterrupt(btnPin[s]);            // if not assigned previously, this will do nothing
+        #endif
       }
     }
 
@@ -236,6 +240,7 @@ void handleSettingsSet(AsyncWebServerRequest *request, byte subPage)
     rlyMde = (bool)request->hasArg(F("RM"));
 
     disablePullUp = (bool)request->hasArg(F("IP"));
+    touchThreshold = request->arg(F("TT")).toInt();
     for (uint8_t i=0; i<WLED_MAX_BUTTONS; i++) {
       char bt[4] = "BT"; bt[2] = (i<10?48:55)+i; bt[3] = 0; // button pin (use A,B,C,... if WLED_MAX_BUTTONS>10)
       char be[4] = "BE"; be[2] = (i<10?48:55)+i; be[3] = 0; // button type (use A,B,C,... if WLED_MAX_BUTTONS>10)
@@ -252,12 +257,21 @@ void handleSettingsSet(AsyncWebServerRequest *request, byte subPage)
           btnPin[i] = -1;
           pinManager.deallocatePin(hw_btn_pin,PinOwner::Button);
         }
-        else if ((buttonType[i] == BTN_TYPE_TOUCH || buttonType[i] == BTN_TYPE_TOUCH_SWITCH) && digitalPinToTouchChannel(btnPin[i]) < 0)
+        else if ((buttonType[i] == BTN_TYPE_TOUCH || buttonType[i] == BTN_TYPE_TOUCH_SWITCH))
         {
-          // not a touch pin
-          DEBUG_PRINTF_P(PSTR("PIN ALLOC error: GPIO%d for touch button #%d is not an touch pin!\n"), btnPin[i], i);
-          btnPin[i] = -1;
-          pinManager.deallocatePin(hw_btn_pin,PinOwner::Button);
+          if (digitalPinToTouchChannel(btnPin[i]) < 0)
+          {
+            // not a touch pin
+            DEBUG_PRINTF_P(PSTR("PIN ALLOC error: GPIO%d for touch button #%d is not an touch pin!\n"), btnPin[i], i);
+            btnPin[i] = -1;
+            pinManager.deallocatePin(hw_btn_pin,PinOwner::Button);
+          }          
+          #ifdef SOC_TOUCH_VERSION_2 // ESP32 S2 and S3 have a fucntion to check touch state but need to attach an interrupt to do so
+          else                    
+          {
+            touchAttachInterrupt(btnPin[i], touchButtonISR, 256 + (touchThreshold << 4)); // threshold on Touch V2 is much higher (1500 is a value given by Espressif example, I measured changes of over 5000)
+          }
+          #endif          
         }
         else
       #endif
@@ -277,7 +291,6 @@ void handleSettingsSet(AsyncWebServerRequest *request, byte subPage)
         buttonType[i] = BTN_TYPE_NONE;
       }
     }
-    touchThreshold = request->arg(F("TT")).toInt();
 
     briS = request->arg(F("CA")).toInt();