Improve co-existence of usermods sharing I2C

Improve co-existence of several popular usermods with respect to shared I2C bus.
- ensure that i2c_sda and i2c_scl are used when defined
- ensure that HW_PIN_SDA / HW_PIN_SCL are not overwritten
- ensure that Wire.begin()nis always called with user-defined pins (remove rogue Wire.begin() without parameters)
- ensure that set.cpp / cfg.cpp use esp32-specific global Wire objects.

usermods/BH1750_v2/usermod_bh1750.h

@@ -3,8 +3,10 @@
 
 #pragma once
 
-#include "wled.h"
+#include <Arduino.h>   // WLEDMM: make sure that I2C drivers have the "right" Wire Object
 #include <Wire.h>
+
+#include "wled.h"
 #include <BH1750.h>
 
 // the max frequency to check photoresistor, 10 seconds
@@ -53,9 +55,13 @@ private:
   static const char _HomeAssistantDiscovery[];
 
   // set the default pins based on the architecture, these get overridden by Usermod menu settings
-  #ifdef ARDUINO_ARCH_ESP32 // ESP32 boards
-    #define HW_PIN_SCL 22
-    #define HW_PIN_SDA 21
+  #ifdef ARDUINO_ARCH_ESP32 // ESP32 boards -- WLEDMM: don't override already defined HW pins
+    #ifndef HW_PIN_SDA
+      #define HW_PIN_SCL 22
+    #endif
+    #ifndef HW_PIN_SDA
+      #define HW_PIN_SDA 21
+    #endif
   #else // ESP8266 boards
     #define HW_PIN_SCL 5
     #define HW_PIN_SDA 4
@@ -121,11 +127,20 @@ public:
   {
     bool HW_Pins_Used = (ioPin[0]==HW_PIN_SCL && ioPin[1]==HW_PIN_SDA); // note whether architecture-based hardware SCL/SDA pins used
     PinOwner po = PinOwner::UM_BH1750; // defaults to being pinowner for SCL/SDA pins
-    PinManagerPinType pins[2] = { { ioPin[0], true }, { ioPin[1], true } };  // allocate pins
     if (HW_Pins_Used) po = PinOwner::HW_I2C; // allow multiple allocations of HW I2C bus pins
+    if ((i2c_scl >= 0) && (i2c_sda >=0)) { // WLEDMM: make sure that global HW pins are used if defined 
+      ioPin[0] = i2c_scl;
+      ioPin[1] = i2c_sda;
+      po = PinOwner::HW_I2C;
+    }
+    PinManagerPinType pins[2] = { { ioPin[0], true }, { ioPin[1], true } };  // allocate pins // WLEDMM: after selecting final pins
     if (!pinManager.allocateMultiplePins(pins, 2, po)) return;
     
-    Wire.begin(ioPin[1], ioPin[0]);
+#if defined(ARDUINO_ARCH_ESP32)
+      Wire.begin(pins[1].pin, pins[0].pin);  // WLEDMM this might silently fail, which is OK as it just means that I2C bus is already running.
+#else
+      Wire.begin();  // WLEDMM - i2c pins on 8266 are fixed.
+#endif
 
     sensorFound = lightMeter.begin();
     initDone = true;
@@ -136,6 +151,7 @@ public:
     if ((!enabled) || strip.isUpdating())
       return;
 
+    if (!sensorFound) return;  // WLEDMM bugfix
     unsigned long now = millis();
 
     // check to see if we are due for taking a measurement
@@ -179,6 +195,8 @@ public:
 
   void addToJsonInfo(JsonObject &root)
   {
+    if ((!enabled) || (!sensorFound)) return;  // WLEDMM bugfix
+
     JsonObject user = root[F("u")];
     if (user.isNull())
       user = root.createNestedObject(F("u"));

usermods/RTC/usermod_rtc.h

@@ -1,5 +1,8 @@
 #pragma once
 
+#include <Arduino.h>   // WLEDMM: make sure that I2C drivers have the "right" Wire Object
+#include <Wire.h>
+
 #include "src/dependencies/time/DS1307RTC.h"
 #include "wled.h"
 
@@ -13,7 +16,17 @@ class RTCUsermod : public Usermod {
 
     void setup() {
       PinManagerPinType pins[2] = { { i2c_scl, true }, { i2c_sda, true } };
+#if defined(ARDUINO_ARCH_ESP32) && defined(HW_PIN_SDA) && defined(HW_PIN_SCL)
+      if (pins[0].pin < 0) pins[0].pin = HW_PIN_SCL; //WLEDMM 
+      if (pins[1].pin < 0) pins[1].pin = HW_PIN_SDA; //WLEDMM 
+#endif
       if (!pinManager.allocateMultiplePins(pins, 2, PinOwner::HW_I2C)) { disabled = true; return; }
+#if defined(ARDUINO_ARCH_ESP32)
+      Wire.begin(pins[1].pin, pins[0].pin);  // WLEDMM this might silently fail, which is OK as it just means that I2C bus is already running.
+#else
+      Wire.begin();  // WLEDMM - i2c pins on 8266 are fixed.
+#endif
+
       RTC.begin();
       time_t rtcTime = RTC.get();
       if (rtcTime) {

usermods/mpu6050_imu/usermod_mpu6050_imu.h

@@ -1,5 +1,8 @@
 #pragma once
 
+#include <Arduino.h>   // WLEDMM: make sure that I2C drivers have the "right" Wire Object
+#include <Wire.h>
+
 #include "wled.h"
 
   // #define MPU6050_INT_GPIO 13  // WLEDMM - better choice on ESP32
@@ -44,9 +47,12 @@
   5. Wire up the MPU6050 as detailed above.
 */
 
-#include "I2Cdev.h"
+// WLEDMM: make sure that the "standard" Wire object is used
+#define I2CDEV_IMPLEMENTATION       I2CDEV_ARDUINO_WIRE
 
-#include "MPU6050_6Axis_MotionApps20.h"
+#include <I2Cdev.h>
+
+#include <MPU6050_6Axis_MotionApps20.h>
 
 // WLEDMM - need to re-define WLED DEBUG_PRINT maros, because the were overwritten by MPU6050_6Axis_MotionApps20.h
 #undef DEBUG_PRINT
@@ -132,7 +138,12 @@ class MPU6050Driver : public Usermod {
 
       // join I2C bus (I2Cdev library doesn't do this automatically)
       #if I2CDEV_IMPLEMENTATION == I2CDEV_ARDUINO_WIRE
-          Wire.begin();        // WLEDMM fixme - this completely ignores any PINS
+#if defined(ARDUINO_ARCH_ESP32)
+      Wire.begin(pins[1].pin, pins[0].pin);        // WLEDMM fix - need to use proper pins, in case that Wire was not started yet. Call will silently fail if Wire is initialized already.
+#else
+      Wire.begin();  // WLEDMM - i2c pins on 8266 are fixed.
+#endif
+
           Wire.setClock(400000); // 400kHz I2C clock. Comment this line if having compilation difficulties
       #elif I2CDEV_IMPLEMENTATION == I2CDEV_BUILTIN_FASTWIRE
           Fastwire::setup(400, true);

usermods/usermod_v2_four_line_display_ALT/usermod_v2_four_line_display_ALT.h

@@ -1,5 +1,10 @@
 #pragma once
 
+#include <Arduino.h>              // WLEDMM: make sure that I2C drivers have the "right" Wire Object
+#include <Wire.h>
+#undef U8X8_NO_HW_I2C             // WLEDMM: we do want I2C hardware drivers - if possible
+//#define WIRE_INTERFACES_COUNT 2   // experimental - tell U8x8Lib that there is a econd Wire unit
+
 #include "wled.h"
 #include <U8x8lib.h> // from https://github.com/olikraus/u8g2/
 #include "4LD_wled_fonts.c"

wled00/cfg.cpp

@@ -1,3 +1,6 @@
+#include <Arduino.h>              // WLEDMM: make sure that I2C drivers have the "right" Wire Object
+#include <Wire.h>
+
 #include "wled.h"
 #include "wled_ethernet.h"
 

wled00/set.cpp

@@ -1,3 +1,6 @@
+#include <Arduino.h>              // WLEDMM: make sure that I2C drivers have the "right" Wire Object
+#include <Wire.h>
+
 #include "wled.h"
 
 /*

wled00/src/dependencies/time/DS1307RTC.h

@@ -14,7 +14,7 @@ class DS1307RTC
   // user-accessible "public" interface
   public:
     DS1307RTC() {}
-    static void begin() { Wire.begin(); }
+    static void begin() { /*Wire.begin();*/ }
     static time_t get();
     static bool set(time_t t);
     static bool read(tmElements_t &tm);