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97 lines
3.2 KiB
C
97 lines
3.2 KiB
C
/*
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* Copyright (c) 2007, Swedish Institute of Computer Science.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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* $Id: rssi-scanner.c,v 1.2 2009/04/25 22:38:00 joxe Exp $
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*/
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/**
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* \file
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* Scanning 2.4 GHz radio frequencies using CC2420 and prints
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* the values
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* \author
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* Joakim Eriksson, joakime@sics.se
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*/
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#include "contiki.h"
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#include "net/rime.h"
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#include "dev/leds.h"
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#include "dev/cc2420.h"
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#include "dev/cc2420_const.h"
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#include "dev/spi.h"
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#include <stdio.h>
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/*---------------------------------------------------------------------------*/
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/* This assumes that the CC2420 is always on and "stable" */
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static void
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set_frq(int c)
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{
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int f;
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// We can read even other channels with CC2420!
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// Fc = 2048 + FSCTRL ; Fc = 2405 + 5(k-11) MHz, k=11,12, ... , 26
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f = c + 352; // Start from 2400 MHz to 2485 MHz,
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//FASTSPI_SETREG(CC2420_FSCTRL, f);
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//FASTSPI_STROBE(CC2420_SRXON);
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CC2420_WRITE_REG(CC2420_FSCTRL, f);
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CC2420_STROBE(CC2420_SRXON);
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}
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static void
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do_rssi(void)
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{
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int channel;
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printf("RSSI:");
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for(channel = 0; channel <= 85; ++channel) {
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set_frq(channel);
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printf("%d ", cc2420_rssi() + 55);
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}
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printf("\n");
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}
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/*---------------------------------------------------------------------------*/
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PROCESS(scanner_process, "RSSI Scanner");
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AUTOSTART_PROCESSES(&scanner_process);
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/*---------------------------------------------------------------------------*/
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PROCESS_THREAD(scanner_process, ev, data)
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{
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PROCESS_BEGIN();
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/* switch mac layer off, and turn radio on */
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rime_mac->off(0);
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cc2420_on();
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while(1) {
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do_rssi();
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PROCESS_PAUSE();
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}
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PROCESS_END();
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}
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/*---------------------------------------------------------------------------*/
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