minimal spi w5100 ethernet boot test for debugging

w5100_spi.ino

/**************************************************************************\
* Pinoccio Library                                                         *
* https://github.com/Pinoccio/library-pinoccio                             *
* Copyright (c) 2014, Pinoccio Inc. All rights reserved.                   *
* ------------------------------------------------------------------------ *
*  This program is free software; you can redistribute it and/or modify it *
*  under the terms of the MIT License as described in license.txt.         *
\**************************************************************************/
#include <SPI.h>
#include <Wire.h>

// Enter a MAC address for your controller below.
// Newer Ethernet shields have a MAC address printed on a sticker on the shield
byte mac[] = { 0x90, 0xA2, 0xDA, 0x0F, 0x9C, 0x42 };
byte ip[] = { 192, 168, 2, 2 };

//EthernetClient client;

void write(uint8_t a, uint8_t b, uint8_t c)
{
  digitalWrite(SS, LOW);
  SPI.transfer(0xF0);
  SPI.transfer(a);
  SPI.transfer(b);
  SPI.transfer(c);
  digitalWrite(SS, HIGH);
}

uint8_t read(uint8_t a, uint8_t b)
{
  uint8_t ret;
  digitalWrite(SS, LOW);
  SPI.transfer(0x0F);
  SPI.transfer(a);
  SPI.transfer(b);
  ret = SPI.transfer(0);
  digitalWrite(SS, HIGH);
  return ret;
}

void setup() {
  Serial.begin(115200);
//  Scout.setup("ethernet", "custom", 42);
//  Ethernet.begin(mac, ip);
  pinMode(SCK, OUTPUT);
  pinMode(MOSI, OUTPUT);
  pinMode(MISO, INPUT);
  pinMode(SS, OUTPUT);
  delay(1000);

  SPI.begin();
  SPI.beginTransaction(SPISettings(4000000, MSBFIRST, SPI_MODE0));

  write(0, 0, 0x80);
  write(0, 0x1B, 0x55);
  write(0, 0x1A, 0x55);

  write(0, 0x09, mac[0]);
  write(0, 0x0A, mac[1]);
  write(0, 0x0B, mac[2]);
  write(0, 0x0C, mac[3]);
  write(0, 0x0D, mac[4]);
  write(0, 0x0E, mac[5]);

  write(0, 0x0F, ip[0]);
  write(0, 0x10, ip[1]);
  write(0, 0x11, ip[2]);
  write(0, 0x12, ip[3]);
  
  delay(1000);
  
  Serial.print("READ ");
  Serial.print(read(0x04, 0x03),HEX);
  Serial.print(" ");
  Serial.print(read(0x05, 0x03),HEX);
  Serial.print(" ");
  Serial.print(read(0x06, 0x03),HEX);
  Serial.print(" ");
  Serial.print(read(0x07, 0x03),HEX);
  Serial.print(" ");
  Serial.println(" done");

  SPI.endTransaction();


}

void loop() {
}