From 161514195c212e83aa7b47ce7917f8f5474807fa Mon Sep 17 00:00:00 2001
From: ntruchsess <norbert.truchsess@t-online.de>
Date: Sun, 2 Mar 2014 16:11:21 +0100
Subject: [PATCH] add ability to read link status to Enc28J60Ethernet.h

---
 utility/Enc28J60Network.cpp | 19 +++++++++++++++++++
 utility/Enc28J60Network.h   |  2 ++
 2 files changed, 21 insertions(+)

diff --git a/utility/Enc28J60Network.cpp b/utility/Enc28J60Network.cpp
index c8494bc..fbef88d 100644
--- a/utility/Enc28J60Network.cpp
+++ b/utility/Enc28J60Network.cpp
@@ -503,6 +503,19 @@ Enc28J60Network::phyWrite(uint8_t address, uint16_t data)
   }
 }
 
+uint16_t
+Enc28J60Network::phyRead(uint8_t address)
+{
+  writeReg(MIREGADR,address);
+  writeReg(MICMD, MICMD_MIIRD);
+  // wait until the PHY read completes
+  while(readReg(MISTAT) & MISTAT_BUSY){
+    delayMicroseconds(15);
+  }  //and MIRDH
+  writeReg(MICMD, 0);
+  return (readReg(MIRDL) | readReg(MIRDH) << 8);
+}
+
 void
 Enc28J60Network::clkout(uint8_t clk)
 {
@@ -575,4 +588,10 @@ Enc28J60Network::powerOn()
   delay(50);
 }
 
+bool
+Enc28J60Network::linkStatus()
+{
+  return (phyRead(PHSTAT2) & 0x0400) > 0;
+}
+
 Enc28J60Network Enc28J60;
diff --git a/utility/Enc28J60Network.h b/utility/Enc28J60Network.h
index b3149cc..7346e47 100644
--- a/utility/Enc28J60Network.h
+++ b/utility/Enc28J60Network.h
@@ -64,6 +64,7 @@ class Enc28J60Network : public MemoryPool
   static void writeReg(uint8_t address, uint8_t data);
   static void writeRegPair(uint8_t address, uint16_t data);
   static void phyWrite(uint8_t address, uint16_t data);
+  static uint16_t phyRead(uint8_t address);
   static void clkout(uint8_t clk);
 
   friend void enc28J60_mempool_block_move_callback(memaddress,memaddress,memaddress);
@@ -73,6 +74,7 @@ class Enc28J60Network : public MemoryPool
   uint8_t getrev(void);
   void powerOn();
   void powerOff();
+  bool linkStatus();
 
   static void init(uint8_t* macaddr);
   static memhandle receivePacket();