modified Ethernet (w5100) library to run on the ESP8266

see #962

Author: Links2004

libraries/Ethernet/README.adoc

@@ -5,6 +5,8 @@ With the Arduino Ethernet Shield, this library allows an Arduino board to connec
 For more information about this library please visit us at
 http://www.arduino.cc/en/Reference/Ethernet
 
+modified to run on the ESP8266
+
 == License ==
 
 Copyright (c) 2010 Arduino LLC. All right reserved.

libraries/Ethernet/src/Ethernet.cpp

@@ -8,9 +8,15 @@ uint8_t EthernetClass::_state[MAX_SOCK_NUM] = {
 uint16_t EthernetClass::_server_port[MAX_SOCK_NUM] = { 
   0, 0, 0, 0 };
 
+#ifdef ESP8266
+static DhcpClass s_dhcp;
+#endif
+
 int EthernetClass::begin(uint8_t *mac_address)
 {
+#ifndef ESP8266
   static DhcpClass s_dhcp;
+#endif
   _dhcp = &s_dhcp;
 
 
@@ -133,4 +139,4 @@ IPAddress EthernetClass::dnsServerIP()
   return _dnsServerAddress;
 }
 
-EthernetClass Ethernet;
+EthernetClass Ethernet;

libraries/Ethernet/src/utility/w5100.cpp

@@ -26,7 +26,7 @@ void W5100Class::init(void)
 {
   delay(300);
 
-#if defined(ARDUINO_ARCH_AVR)
+#if defined(ARDUINO_ARCH_AVR) || defined(ESP8266)
   SPI.begin();
   initSS();
 #else
@@ -136,7 +136,7 @@ void W5100Class::read_data(SOCKET s, volatile uint16_t src, volatile uint8_t *ds
 
 uint8_t W5100Class::write(uint16_t _addr, uint8_t _data)
 {
-#if defined(ARDUINO_ARCH_AVR)
+#if defined(ARDUINO_ARCH_AVR) || defined(ESP8266)
   setSS();  
   SPI.transfer(0xF0);
   SPI.transfer(_addr >> 8);
@@ -156,7 +156,7 @@ uint16_t W5100Class::write(uint16_t _addr, const uint8_t *_buf, uint16_t _len)
 {
   for (uint16_t i=0; i<_len; i++)
   {
-#if defined(ARDUINO_ARCH_AVR)
+#if defined(ARDUINO_ARCH_AVR) || defined(ESP8266)
     setSS();    
     SPI.transfer(0xF0);
     SPI.transfer(_addr >> 8);
@@ -177,7 +177,7 @@ uint16_t W5100Class::write(uint16_t _addr, const uint8_t *_buf, uint16_t _len)
 
 uint8_t W5100Class::read(uint16_t _addr)
 {
-#if defined(ARDUINO_ARCH_AVR)
+#if defined(ARDUINO_ARCH_AVR) || defined(ESP8266)
   setSS();  
   SPI.transfer(0x0F);
   SPI.transfer(_addr >> 8);
@@ -197,7 +197,7 @@ uint16_t W5100Class::read(uint16_t _addr, uint8_t *_buf, uint16_t _len)
 {
   for (uint16_t i=0; i<_len; i++)
   {
-#if defined(ARDUINO_ARCH_AVR)
+#if defined(ARDUINO_ARCH_AVR) || defined(ESP8266)
     setSS();
     SPI.transfer(0x0F);
     SPI.transfer(_addr >> 8);
@@ -222,4 +222,4 @@ void W5100Class::execCmdSn(SOCKET s, SockCMD _cmd) {
   // Wait for command to complete
   while (readSnCR(s))
     ;
-}
+}

libraries/Ethernet/src/utility/w5100.h

@@ -16,6 +16,8 @@
 
 #if defined(ARDUINO_ARCH_AVR)
 #define SPI_ETHERNET_SETTINGS SPISettings(4000000, MSBFIRST, SPI_MODE0)
+#elif defined(ESP8266)
+#define SPI_ETHERNET_SETTINGS SPISettings(14000000, MSBFIRST, SPI_MODE0)
 #else
 #define SPI_ETHERNET_SETTINGS SPI_CS,SPISettings(4000000, MSBFIRST, SPI_MODE0)
 #endif
@@ -348,6 +350,10 @@ class W5100Class {
   inline static void setSS()     { PORTB &= ~_BV(2); };
   inline static void resetSS()   { PORTB |=  _BV(2); };
 #endif
+#elif defined(ESP8266)
+  inline static void initSS()    { pinMode(SS, OUTPUT); };
+  inline static void setSS()     { GPOC = digitalPinToBitMask(SS); };
+  inline static void resetSS()   { GPOS = digitalPinToBitMask(SS); };
 #endif // ARDUINO_ARCH_AVR
 };
 
@@ -409,4 +415,4 @@ void W5100Class::setRetransmissionCount(uint8_t _retry) {
   writeRCR(_retry);
 }
 
-#endif
+#endif