adjust clock stretch

Author: Michael Graff

cores/esp8266/core_esp8266_si2c.c

@@ -1,9 +1,9 @@
-/* 
+/*
   si2c.c - Software I2C library for esp8266
 
   Copyright (c) 2015 Hristo Gochkov. All rights reserved.
   This file is part of the esp8266 core for Arduino environment.
- 
+
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
@@ -26,20 +26,20 @@ unsigned char twi_dcount = 18;
 static unsigned char twi_sda, twi_scl;
 
 #define SDA_LOW()   (GPES = (1 << twi_sda)) //Enable SDA (becomes output and since GPO is 0 for the pin, it will pull the line low)
-#define SDA_HIGH()  (GPEC = (1 << twi_sda)) //Disable SDA (becomes input and since it has pullup it will go high) 
+#define SDA_HIGH()  (GPEC = (1 << twi_sda)) //Disable SDA (becomes input and since it has pullup it will go high)
 #define SDA_READ()  ((GPI & (1 << twi_sda)) != 0)
-#define SCL_LOW()   (GPES = (1 << twi_scl)) 
-#define SCL_HIGH()  (GPEC = (1 << twi_scl)) 
+#define SCL_LOW()   (GPES = (1 << twi_scl))
+#define SCL_HIGH()  (GPEC = (1 << twi_scl))
 #define SCL_READ()  ((GPI & (1 << twi_scl)) != 0)
 
 #ifndef FCPU80
 #define FCPU80 80000000L
 #endif
 
 #if F_CPU == FCPU80
-#define TWI_CLOCK_STRETCH 200
+#define TWI_CLOCK_STRETCH 800
 #else
-#define TWI_CLOCK_STRETCH 400
+#define TWI_CLOCK_STRETCH 1600
 #endif
 
 void twi_setClock(unsigned int freq){
@@ -99,7 +99,7 @@ static bool twi_write_stop(void){
   twi_delay(twi_dcount);
   SDA_HIGH();
   twi_delay(twi_dcount);
-  
+
   return true;
 }