From aa22c07312a3f4b065a810cb91999e587b49166d Mon Sep 17 00:00:00 2001
From: Matej Sychra <suculent@me.com>
Date: Thu, 22 Nov 2018 17:21:21 +0100
Subject: [PATCH] clock stretch fix done right (#5363)

---
 cores/esp8266/core_esp8266_si2c.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/cores/esp8266/core_esp8266_si2c.c b/cores/esp8266/core_esp8266_si2c.c
index bb7b66ed0..549273a1a 100644
--- a/cores/esp8266/core_esp8266_si2c.c
+++ b/cores/esp8266/core_esp8266_si2c.c
@@ -267,6 +267,7 @@ unsigned char twi_writeTo(unsigned char address, unsigned char * buf, unsigned i
     SCL_LOW();
     twi_delay(twi_dcount);
     SCL_HIGH();
+    unsigned int t=0; while(SCL_READ()==0 && (t++)<twi_clockStretchLimit); // twi_clockStretchLimit
     twi_delay(twi_dcount);
   }
   return 0;
@@ -287,6 +288,7 @@ unsigned char twi_readFrom(unsigned char address, unsigned char* buf, unsigned i
     SCL_LOW();
     twi_delay(twi_dcount);
     SCL_HIGH();
+    unsigned int t=0; while(SCL_READ()==0 && (t++)<twi_clockStretchLimit); // twi_clockStretchLimit
     twi_delay(twi_dcount);
   }
   return 0;