From 4d98cea085d619bed7026b37071bd8402a485d95 Mon Sep 17 00:00:00 2001
From: me-no-dev <hristo@espressif.com>
Date: Sun, 19 Jul 2020 02:21:15 +0300
Subject: [PATCH] Add Wire:setPins(sda, scl)

Fixes: https://github.com/espressif/arduino-esp32/issues/3779
---
 libraries/Wire/src/Wire.cpp | 11 +++++++++++
 libraries/Wire/src/Wire.h   |  4 ++++
 2 files changed, 15 insertions(+)

diff --git a/libraries/Wire/src/Wire.cpp b/libraries/Wire/src/Wire.cpp
index bc5801478..3fbd0eb08 100644
--- a/libraries/Wire/src/Wire.cpp
+++ b/libraries/Wire/src/Wire.cpp
@@ -58,6 +58,17 @@ TwoWire::~TwoWire()
     }
 }
 
+bool TwoWire::setPins(int sdaPin, int sclPin)
+{
+    if(i2c) {
+        log_e("can not set pins if begin was already called");
+        return false;
+    }
+    sda = sdaPin;
+    scl = sclPin;
+    return true;
+}
+
 bool TwoWire::begin(int sdaPin, int sclPin, uint32_t frequency)
 {
     if(sdaPin < 0) { // default param passed
diff --git a/libraries/Wire/src/Wire.h b/libraries/Wire/src/Wire.h
index 37288beb6..00f268b7d 100644
--- a/libraries/Wire/src/Wire.h
+++ b/libraries/Wire/src/Wire.h
@@ -67,6 +67,10 @@ protected:
 public:
     TwoWire(uint8_t bus_num);
     ~TwoWire();
+    
+    //call setPins() first, so that begin() can be called without arguments from libraries
+    bool setPins(int sda, int scl);
+    
     bool begin(int sda=-1, int scl=-1, uint32_t frequency=0); // returns true, if successful init of i2c bus
       // calling will attemp to recover hung bus