W5200.cpp

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#include "W5200.hh"
#include <W5X00.h>
#include <DNS.h>
#include <DHCP.h>

#if !defined(BOARD_ATTINY)

#define M_CREG(name) uint16_t(&m_creg->name)
#define M_SREG(name) uint16_t(&m_sreg->name)

#define W5X00 W5200
#include <W5X00.inc>

void
W5200::write(uint16_t addr, const void* buf, size_t len, bool progmem)
{
  if (len == 0) return;
  const uint8_t* bp = (const uint8_t*) buf;
  spi.acquire(this);
    spi.begin();
      spi.transfer_start(addr >> 8);
      spi.transfer_next(addr);
      spi.transfer_next((OP_WRITE | ((len & 0x7F00) >> 8)));
      spi.transfer_next(len & 0x00FF);
      for (size_t i = 0; i < len; i++, bp++)
        spi.transfer_next(progmem ? pgm_read_byte(bp) : *bp);
      spi.transfer_await();
    spi.end();
  spi.release();
}

void
W5200::read(uint16_t addr, void* buf, size_t len)
{
  if (len == 0) return;
  uint8_t* bp = (uint8_t*) buf;
  spi.acquire(this);
    spi.begin();
      spi.transfer_start(addr >> 8);
      spi.transfer_next(addr);
      spi.transfer_next((OP_READ | ((len & 0x7F00) >> 8)));
      spi.transfer_next(len & 0x00FF);
      spi.transfer_await();
      for (size_t i = 0; i < len; i++, bp++)
        *bp = spi.transfer(0);
    spi.end();
  spi.release();
}

bool
W5200::begin(uint8_t ip[4], uint8_t subnet[4], uint16_t timeout)
{
  // Initiate socket structure; buffer allocation and socket register pointer
  for (uint8_t i = 0; i < SOCK_MAX; i++) {
    SocketRegister* sreg = &((SocketRegister*) SOCKET_REGISTER_BASE)[i];
    m_sock[i].m_proto = 0;
    m_sock[i].m_sreg = sreg;
    m_sock[i].m_tx_buf = TX_MEMORY_BASE + (i * BUF_MAX);
    m_sock[i].m_rx_buf = RX_MEMORY_BASE + (i * BUF_MAX);
    m_sock[i].m_dev = this;
  }

  // Check for default network address
  uint8_t BROADCAST[4] = { 0, 0, 0, 0 };
  if (ip == NULL || subnet == NULL) {
    subnet = BROADCAST;
    ip = BROADCAST;
  }

  // Adjust timeout period to 100 us scale
  timeout = swap(timeout * 10);

  // Read hardware address from program memory
  uint8_t mac[6];
  memcpy_P(mac, m_mac, sizeof(mac));

  // Reset and setup registers
  write(M_CREG(MR), MR_RST);
  write(M_CREG(SHAR), mac, sizeof(m_creg->SHAR));
  write(M_CREG(RTR), &timeout, sizeof(m_creg->RTR));

  // Set source network address, subnet mask and default gateway
  bind(ip, subnet);

  // TODO: Attach interrupt handler
  // spi.attach(this);

  return (true);
}
#endif