root/branches/follower/libw5100/src/libw5100/w5100_device.cpp

/*

  W5100 device configuration

  Author: 

     Philip Lindsay <follower@rancidbacon.com>

  License:

     Copyright 2007-2008 // LGPL

*/

#include "w5100_device.h"

W5100Device::W5100Device(int resetPin) {
  /*

    Store configuration and initialise the W5100 device

  */

  // TODO: We should really allow the chip-select pin to be set here?
  //       Or require that it's defined. (Currently in the library file 'types.h'.)
  _resetPin = resetPin;
  
  _init();
}


void W5100Device::_init(void) {
  /*
  
     Initialise the W5100 device and driver.
     
   */

  /*
     Initialise the W5100 chip
     
     (Originally I thought it was possible for the chip
      to function without a hardware reset but it
      seems not to be the case.)
   */   
  pinMode(_resetPin, OUTPUT);
  
  // We rely on the time between function calls to
  // be long enough for the chip to recognise the
  // reset.
  digitalWrite(_resetPin, HIGH);
  digitalWrite(_resetPin, LOW); // reset
  digitalWrite(_resetPin, HIGH);
  
  // Enable SPI bug fix
  // (We only need to do this to enable additional optional
  // devices on the SPI bus. The current version of the W5100
  // requires SPI_EN to be low when you communicate with other
  // devices on the SPI bus.)
#define PIN_SPI_EN 8 // WIZnet module SPI_EN  
  pinMode(PIN_SPI_EN, OUTPUT);
  digitalWrite(PIN_SPI_EN, HIGH);
  
  // Chip initialisation by driver
  // Might be redundant following the above reset,
  // as this performs a software reset.
  iinchip_init();
  
  // Initialise driver
  // (This is required to configure some variables used
  // internally by the driver--even if the default chip
  // configuration is used.)
  sysinit(0x55, 0x55);  
}


byte * W5100Device::_packBuffer(byte b0, byte b1, byte b2, byte b3) {
  /*
  
     Utility function to pack four bytes into a buffer
     in order to pass on to the lower-level drive functions.

   */
  return _packBuffer(b0, b1, b2, b3, 0, 0); // Adds two bytes of padding
}


byte * W5100Device::_packBuffer(byte b0, byte b1, byte b2, byte b3, byte b4, byte b5) {
  /*
  
     Utility function to pack six bytes into a buffer
     in order to pass on to the lower-level drive functions.

   */
  _scratchBuffer[0] = b0;
  _scratchBuffer[1] = b1;
  _scratchBuffer[2] = b2;
  _scratchBuffer[3] = b3;
  _scratchBuffer[4] = b4;
  _scratchBuffer[5] = b5;

  return _scratchBuffer;
}


void W5100Device::setIp(byte b0, byte b1, byte b2, byte b3) {
  /*

     Set device IP address.
  
   */
  setSIPR(_packBuffer(b0, b1, b2, b3));  
}


void W5100Device::setMask(byte b0, byte b1, byte b2, byte b3) {
  /*
  
     Set device net mask.

   */
  setSUBR(_packBuffer(b0, b1, b2, b3));  
}


void W5100Device::setGateway(byte b0, byte b1, byte b2, byte b3) {
  /*
    
     Set device gateway.

     (Note: this is required to access the internet from within a LAN.)

   */
  setGAR(_packBuffer(b0, b1, b2, b3));  
}


void W5100Device::setMac(byte b0, byte b1, byte b2, byte b3, byte b4, byte b5) {
  /*

     Set device MAC address.
  
   */
  setSHAR(_packBuffer(b0, b1, b2, b3, b4, b5));  
}

// W5100Device W5100 = W5100Device(PIN_RESET);