diff --git a/core/dev/simple-cc2420.c b/core/dev/simple-cc2420.c
new file mode 100644
index 000000000..cc00014f3
--- /dev/null
+++ b/core/dev/simple-cc2420.c
@@ -0,0 +1,449 @@
+/*
+ * Copyright (c) 2007, Swedish Institute of Computer Science
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * This file is part of the Contiki operating system.
+ *
+ * @(#)$Id: simple-cc2420.c,v 1.1 2007/03/15 21:26:00 adamdunkels Exp $
+ */
+/*
+ * This code is almost device independent and should be easy to port.
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include "contiki.h"
+
+#if defined(__AVR__)
+#include <avr/io.h>
+#elif defined(__MSP430__)
+#include <io.h>
+#endif
+
+#include "dev/leds.h"
+
+#include "dev/spi.h"
+#include "dev/simple-cc2420.h"
+#include "dev/cc2420_const.h"
+
+#define FOOTER1_CRC_OK      0x80
+#define FOOTER1_CORRELATION 0x7f
+
+#if 0
+#define PRINTF(...) printf(__VA_ARGS__)
+#else
+#define PRINTF(...) do {} while (0)
+#endif
+/*---------------------------------------------------------------------------*/
+PROCESS(simple_cc2420_process, "CC2420 driver");
+/*---------------------------------------------------------------------------*/
+
+static void (* receiver_callback)(void);
+
+signed char simple_cc2420_last_rssi;
+u8_t simple_cc2420_last_correlation;
+
+static u8_t receive_on;
+/* Radio stuff in network byte order. */
+static u16_t pan_id;
+/*---------------------------------------------------------------------------*/
+static unsigned
+getreg(enum cc2420_register regname)
+{
+  unsigned reg;
+  int s = splhigh();
+  FASTSPI_GETREG(regname, reg);
+  splx(s);
+  return reg;
+}
+/*---------------------------------------------------------------------------*/
+static void
+setreg(enum cc2420_register regname, unsigned value)
+{
+  int s = splhigh();
+  FASTSPI_SETREG(regname, value);
+  splx(s);
+}
+/*---------------------------------------------------------------------------*/
+static void
+strobe(enum cc2420_register regname)
+{
+  int s = splhigh();
+  FASTSPI_STROBE(regname);
+  splx(s);
+}
+/*---------------------------------------------------------------------------*/
+static unsigned
+status(void)
+{
+  u8_t status;
+  int s = splhigh();
+  FASTSPI_UPD_STATUS(status);
+  splx(s);
+  return status;
+}
+/*---------------------------------------------------------------------------*/
+#define AUTOACK (1 << 4)
+#define ADR_DECODE (1 << 11)
+#define RXFIFO_PROTECTION (1 << 9)
+#define CORR_THR(n) (((n) & 0x1f) << 6)
+#define FIFOP_THR(n) ((n) & 0x7f)
+#define RXBPF_LOCUR (1 << 13);
+/*---------------------------------------------------------------------------*/
+void
+simple_cc2420_set_receiver(void (* recv)(void))
+{
+  receiver_callback = recv;
+}
+/*---------------------------------------------------------------------------*/
+void
+simple_cc2420_init(void)
+{
+  u16_t reg;
+  {
+    int s = splhigh();
+    __cc2420_arch_init();		/* Initalize ports and SPI. */
+    DISABLE_FIFOP_INT();
+    FIFOP_INT_INIT();
+    splx(s);
+  }
+
+  /* Turn on voltage regulator and reset. */
+  SET_VREG_ACTIVE();
+  //clock_delay(250); OK
+  SET_RESET_ACTIVE();
+  clock_delay(127);
+  SET_RESET_INACTIVE();
+  //clock_delay(125); OK
+
+
+  /* Turn on the crystal oscillator. */
+  strobe(CC2420_SXOSCON);
+
+  /* Turn off automatic packet acknowledgment. */
+  reg = getreg(CC2420_MDMCTRL0);
+  reg &= ~AUTOACK;
+  setreg(CC2420_MDMCTRL0, reg);
+
+  /* Turn off address decoding. */
+  reg = getreg(CC2420_MDMCTRL0);
+  reg &= ~ADR_DECODE;
+  setreg(CC2420_MDMCTRL0, reg);
+
+  /* Change default values as recomended in the data sheet, */
+  /* correlation threshold = 20, RX bandpass filter = 1.3uA. */
+  setreg(CC2420_MDMCTRL1, CORR_THR(20));
+  reg = getreg(CC2420_RXCTRL1);
+  reg |= RXBPF_LOCUR;
+  setreg(CC2420_RXCTRL1, reg);
+  
+  /* Set the FIFOP threshold to maximum. */
+  setreg(CC2420_IOCFG0, FIFOP_THR(127));
+
+  /* Turn off "Security enable" (page 32). */
+  reg = getreg(CC2420_SECCTRL0);
+  reg &= ~RXFIFO_PROTECTION;
+  setreg(CC2420_SECCTRL0, reg);
+
+  simple_cc2420_set_chan_pan_addr(11, 0xffff, 0x0000, NULL);
+
+  process_start(&simple_cc2420_process, NULL);
+}
+/*---------------------------------------------------------------------------*/
+int
+simple_cc2420_send(const u8_t *payload, u8_t payload_len)
+{
+  u8_t spiStatusByte;
+  int s, i;
+  
+  /* struct hdr_802_15::len shall *not* be counted, thus the -1.
+   * 2 == sizeof(footer).
+   */
+  /*  if(((hdr_len - 1) + payload_len + 2) > MAX_PACKET_LEN) {
+    return -1;
+    }*/
+
+  /* This code uses the CC2420 CCA (Clear Channel Assessment) to
+   * implement Carrier Sense Multiple Access with Collision Avoidance
+   * (CSMA-CA) and requires the receiver to be enabled and ready.
+   */
+  if(!receive_on) {
+    return -2;
+  }
+
+  /* Wait for previous transmission to finish and RSSI. */
+  do {
+    spiStatusByte = status();
+    if(!(spiStatusByte & BV(CC2420_RSSI_VALID))) { /* RSSI needed by CCA */
+      continue;
+    }
+  } while(spiStatusByte & BV(CC2420_TX_ACTIVE));
+
+#if 0
+  hdr->dst_pan = pan_id;	/* Not at fixed position! xxx/bg */
+  last_correspondent = hdr->dst; /* Not dst either. */
+  last_used_seq++;
+  hdr->seq = last_used_seq;
+  cc2420_ack_received = 0;
+#endif
+  
+  /* Write packet to TX FIFO, appending FCS if AUTOCRC is enabled. */
+  strobe(CC2420_SFLUSHTX); /* Cancel send that never started. */
+  s = splhigh();
+  /*  FASTSPI_WRITE_FIFO(hdr, hdr_len);*/
+  FASTSPI_WRITE_FIFO(&payload_len, 1);
+  FASTSPI_WRITE_FIFO(payload, payload_len);
+  splx(s);
+  PRINTF("simple_cc2420_send: wrote %d bytes\n", payload_len);
+
+  /*  if(hdr->dst == 0xffff) {
+    int i;
+    for(i = 1; i < 3; i++) {
+      if(do_send() >= 0) {
+	return 0;
+      }
+      clock_delay(i*256);
+    }
+    }*/
+
+  if(FIFOP_IS_1 && !FIFO_IS_1) {
+    /* RXFIFO overflow, send on retransmit. */
+    PRINTF("rxfifo overflow!\n");
+    return -4;
+  }
+
+  /* The TX FIFO can only hold one packet! Make sure to not overrun
+   * FIFO by waiting for transmission to start here and synchronizing
+   * with the CC2420_TX_ACTIVE check in cc2420_send.
+   *
+   * Note that we may have to wait up to 320 us (20 symbols) before
+   * transmission starts.
+   */
+#ifdef TMOTE_SKY
+#define LOOP_20_SYMBOLS 100	/* 326us (msp430 @ 2.4576MHz) */
+#elif __AVR__
+#define LOOP_20_SYMBOLS 500	/* XXX */
+#endif
+  strobe(CC2420_STXONCCA);
+  for(i = LOOP_20_SYMBOLS; i > 0; i--) {
+    if(SFD_IS_1) {
+      PRINTF("simple_cc2420: do_send() transmission has started\n");
+      return 0;			/* Transmission has started. */
+    }
+  }
+
+  PRINTF("simple_cc2420: do_send() transmission never started\n");
+  return -3;			/* Transmission never started! */
+}
+/*---------------------------------------------------------------------------*/
+void
+simple_cc2420_off(void)
+{
+  u8_t spiStatusByte;
+
+  if (receive_on == 0)
+    return;
+  receive_on = 0;
+  /* Wait for transmission to end before turning radio off. */
+  do {
+    spiStatusByte = status();
+  } while(spiStatusByte & BV(CC2420_TX_ACTIVE));
+
+  strobe(CC2420_SRFOFF);
+  DISABLE_FIFOP_INT();
+}
+/*---------------------------------------------------------------------------*/
+void
+simple_cc2420_on(void)
+{
+  if(receive_on) {
+    return;
+  }
+  receive_on = 1;
+
+  strobe(CC2420_SRXON);
+  strobe(CC2420_SFLUSHRX);
+  ENABLE_FIFOP_INT();
+}
+/*---------------------------------------------------------------------------*/
+void
+simple_cc2420_set_chan_pan_addr(unsigned channel, /* 11 - 26 */
+				unsigned pan,
+				unsigned addr,
+				const u8_t *ieee_addr)
+{
+  /*
+   * Subtract the base channel (11), multiply by 5, which is the
+   * channel spacing. 357 is 2405-2048 and 0x4000 is LOCK_THR = 1.
+   */
+  u8_t spiStatusByte;
+  u16_t f = channel;
+  int s;
+        
+  f = 5*(f - 11) + 357 + 0x4000;
+  /*
+   * Writing RAM requires crystal oscillator to be stable.
+   */
+  do {
+    spiStatusByte = status();
+  } while(!(spiStatusByte & (BV(CC2420_XOSC16M_STABLE))));
+
+  pan_id = pan;
+  setreg(CC2420_FSCTRL, f);
+  s = splhigh();
+  FASTSPI_WRITE_RAM_LE(&pan, CC2420RAM_PANID, 2, f);
+  FASTSPI_WRITE_RAM_LE(&addr, CC2420RAM_SHORTADDR, 2, f);
+  if(ieee_addr != NULL) {
+    FASTSPI_WRITE_RAM_LE(ieee_addr, CC2420RAM_IEEEADDR, 8, f);
+  }
+  splx(s);
+}
+/*---------------------------------------------------------------------------*/
+static volatile u8_t rx_fifo_remaining_bytes;
+    
+/*
+ * Interrupt either leaves frame intact in FIFO or reads *only* the
+ * MAC header and sets rx_fifo_remaining_bytes.
+ *
+ * In order to quickly empty the FIFO ack processing is done at
+ * interrupt priority rather than poll priority.
+ */
+int
+__cc2420_intr(void)
+{
+  u8_t length;
+  /*  const u8_t *const ack_footer = (u8_t *)&h.dst_pan;*/
+
+  leds_toggle(LEDS_YELLOW);
+  CLEAR_FIFOP_INT();
+
+  if(spi_busy || rx_fifo_remaining_bytes > 0) {
+    /* SPI bus hardware is currently used elsewhere (UART0 or I2C bus)
+     * or we already have a packet in the works and will have to defer
+     * interrupt processing of this packet in a fake interrupt.
+     */
+    process_poll(&simple_cc2420_process);
+    return 1;
+  }
+
+  FASTSPI_READ_FIFO_BYTE(length);
+  if(length > SIMPLE_CC2420_MAX_PACKET_LEN) {
+    /* Oops, we must be out of sync. */
+    FASTSPI_STROBE(CC2420_SFLUSHRX);
+    FASTSPI_STROBE(CC2420_SFLUSHRX);
+    leds_toggle(LEDS_RED);
+    return 0;
+  }
+
+
+  /* The payload and footer is now left in the RX FIFO and will be
+   * picked up asynchronously at poll priority in the cc2420_process
+   * below.
+   */
+  rx_fifo_remaining_bytes = length;
+  process_poll(&simple_cc2420_process);
+  leds_toggle(LEDS_GREEN);
+  return 1;
+}
+/*---------------------------------------------------------------------------*/
+PROCESS_THREAD(simple_cc2420_process, ev, data)
+{
+  PROCESS_BEGIN();
+
+  while(1) {
+    PROCESS_YIELD();
+
+    if(receiver_callback != NULL) {
+      receiver_callback();
+    } else {
+      PRINTF("simple_cc2420_process dropping %d bytes\n",
+	     rx_fifo_remaining_bytes);
+      if(rx_fifo_remaining_bytes > 0) {
+	int s;
+	s = splhigh();
+	FASTSPI_READ_FIFO_GARBAGE(rx_fifo_remaining_bytes);
+	rx_fifo_remaining_bytes = 0; /* RX FIFO emptied! */
+	splx(s);
+      }
+    }
+  }
+
+  PROCESS_END();
+}
+/*---------------------------------------------------------------------------*/
+int
+simple_cc2420_read(u8_t *buf, u8_t bufsize)
+{
+  u8_t footer[2];
+  int len;
+  int s;
+  
+  len = rx_fifo_remaining_bytes;
+
+  if(len > 0) {
+    /* Read payload and two bytes of footer */
+    if(len > bufsize) {
+      PRINTF("simple_cc2420_poll too big len=%d\n", len);
+      s = splhigh();
+      FASTSPI_READ_FIFO_GARBAGE(len);
+      rx_fifo_remaining_bytes = 0; /* RX FIFO emptied! */
+      splx(s);
+      len = 0;
+    } else {
+      s = splhigh();
+      FASTSPI_READ_FIFO_NO_WAIT(buf, len - 2);
+      FASTSPI_READ_FIFO_NO_WAIT(footer, 2);
+      rx_fifo_remaining_bytes = 0; /* RX FIFO emptied! */
+      splx(s);
+      if(footer[1] & FOOTER1_CRC_OK) {
+	simple_cc2420_last_rssi = footer[0];
+	simple_cc2420_last_correlation = footer[1] & FOOTER1_CORRELATION;
+	/*	if((h.fc0 & FC0_TYPE_MASK) == FC0_TYPE_DATA) {
+	  uip_len = len - 2;
+	  }*/
+      }
+    }
+  }
+  
+  /* Clean up in case of FIFO overflow!  This happens for every full
+   * length frame and is signaled by FIFOP = 1 and FIFO = 0.
+   */
+  if(FIFOP_IS_1 && !FIFO_IS_1) {
+    strobe(CC2420_SFLUSHRX);
+    strobe(CC2420_SFLUSHRX);
+  }
+  
+  if(FIFOP_IS_1) {
+    s = splhigh();
+    __cc2420_intr();		/* Fake interrupt! */
+    splx(s);
+  }
+
+  return len;
+}
+/*---------------------------------------------------------------------------*/
diff --git a/core/dev/simple-cc2420.h b/core/dev/simple-cc2420.h
new file mode 100644
index 000000000..cc82605e8
--- /dev/null
+++ b/core/dev/simple-cc2420.h
@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2007, Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * This file is part of the Contiki operating system.
+ *
+ * $Id: simple-cc2420.h,v 1.1 2007/03/15 21:26:00 adamdunkels Exp $
+ */
+
+/**
+ * \file
+ *         A brief description of what this file is.
+ * \author
+ *         Adam Dunkels <adam@sics.se>
+ */
+
+#ifndef __SIMPLE_CC2420_H__
+#define __SIMPLE_CC2420_H__
+
+#include "contiki.h"
+
+#define SIMPLE_CC2420_MAX_PACKET_LEN      127
+
+void simple_cc2420_init(void);
+
+void simple_cc2420_on(void);
+void simple_cc2420_off(void);
+
+int simple_cc2420_read(u8_t *buf, u8_t bufsize);
+
+int simple_cc2420_send(const u8_t *data, u8_t len);
+
+void simple_cc2420_set_receiver(void (* recv)(void));
+
+void simple_cc2420_set_chan_pan_addr(unsigned channel, /* 11 - 26 */
+				     unsigned pan,
+				     unsigned addr,
+				     const u8_t *ieee_addr);
+
+#endif /* __SIMPLE_CC2420_H__ */