feat(wire): Add access method to get the I2C bus number

Author: me-no-dev

libraries/Wire/src/Wire.cpp

@@ -39,7 +39,7 @@ extern "C" {
 #include "Arduino.h"
 
 TwoWire::TwoWire(uint8_t bus_num)
-  : num(bus_num & 1), sda(-1), scl(-1), bufferSize(I2C_BUFFER_LENGTH)  // default Wire Buffer Size
+  : num(bus_num), sda(-1), scl(-1), bufferSize(I2C_BUFFER_LENGTH)  // default Wire Buffer Size
     ,
     rxBuffer(NULL), rxIndex(0), rxLength(0), txBuffer(NULL), txLength(0), txAddress(0), _timeOutMillis(50), nonStop(false)
 #if !CONFIG_DISABLE_HAL_LOCKS
@@ -62,6 +62,10 @@ TwoWire::~TwoWire() {
 #endif
 }
 
+uint8_t TwoWire::getBusNum() {
+  return num;
+}
+
 bool TwoWire::initPins(int sdaPin, int sclPin) {
   if (sdaPin < 0) {  // default param passed
     if (num == 0) {

libraries/Wire/src/Wire.h

@@ -105,6 +105,8 @@ class TwoWire : public HardwareI2C {
 
   bool end() override;
 
+  uint8_t getBusNum();
+
   bool setClock(uint32_t freq) override;
 
   void beginTransmission(uint8_t address) override;