From be2a26b3ffa9b0cca8b772baa5a6aa654e4422df Mon Sep 17 00:00:00 2001
From: Me No Dev <me-no-dev@users.noreply.github.com>
Date: Fri, 25 Nov 2016 11:25:50 +0200
Subject: [PATCH] set SCL to OUTPUT_OPEN_DRAIN

fixes: https://github.com/espressif/arduino-esp32/issues/69
---
 cores/esp32/esp32-hal-i2c.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cores/esp32/esp32-hal-i2c.c b/cores/esp32/esp32-hal-i2c.c
index a803d287..ca7bc441 100644
--- a/cores/esp32/esp32-hal-i2c.c
+++ b/cores/esp32/esp32-hal-i2c.c
@@ -67,7 +67,7 @@ i2c_err_t i2cAttachSCL(i2c_t * i2c, int8_t scl)
     if(i2c == NULL){
         return I2C_ERROR_DEV;
     }
-    pinMode(scl, OUTPUT);
+    pinMode(scl, OUTPUT_OPEN_DRAIN);
     pinMatrixOutAttach(scl, I2C_SCL_IDX(i2c->num), false, false);
     pinMatrixInAttach(scl, I2C_SCL_IDX(i2c->num), false);
     return I2C_ERROR_OK;