109 lines
4 KiB
C
109 lines
4 KiB
C
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/*
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* Copyright (c) 2010, Loughborough University - 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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/**
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* \file
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* Header file used by the example demonstrating the cc2431 location
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* engine.
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*
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* This file contains declarations of the location engine registers and
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* the LOCENG register bits. It also contains some data structures used
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* to store calculation parameters and reference node coordinates.
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*
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* This file only needs to be included bye the blind node code file.
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*
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* More information on the cc2431 Location Engine can be found in:
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* - cc2431 Datasheet
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* - K. Aamodt, "CC2431 Location Engine", Texas Instruments Application
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* Note 42.
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*
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* \author
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* George Oikonomou - <oikonomou@users.sourceforge.net>
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*/
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#include "8051def.h"
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#include <lint.h> /* For syntax parsers */
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/* Location Engine Registers on the cc2431 */
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__xdata __at (0xDF55) unsigned char REFCOORD;
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__xdata __at (0xDF56) unsigned char MEASPARM;
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__xdata __at (0xDF57) unsigned char LOCENG;
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__xdata __at (0xDF58) unsigned char LOCX;
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__xdata __at (0xDF59) unsigned char LOCY;
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/* LOCENG Register Bits */
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#define LOCENG_RUN 0x01
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#define LOCENG_REFLD 0x02
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#define LOCENG_PARLD 0x04
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#define LOCENG_DONE 0x08
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#define LOCENG_EN 0x10
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/* cc2431 chips report 0x89 when the CHIPID register is read */
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#define CC2431_CHIP_ID 0x89
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/*
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* Struct for the Calculation Parameters.
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* Values stored here feed the MEASPARM register.
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*
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* Values should be stored here in Location Engine format:
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* RSSI: 0.5 Precision, without the minus sign. All 16 must be used. Use 0
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* to reduce the number of ref. nodes used in the calculation.
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* Value range [-95 dBm , -40 dBm]
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* A: 0.5 Precision. Value range [30.0 , 50.0] (Thus [60 , 100] decimal)
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* n: Use the n Index value [0 , 31] - See cc2431 datasheet, Table 2.
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* delta: Must be present. If we want the calculation to be unrestricted,
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* use 0xFF
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*
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*/
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struct meas_params {
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uint8_t alpha;
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uint8_t n;
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uint8_t x_min;
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uint8_t x_delta;
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uint8_t y_min;
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uint8_t y_delta;
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uint8_t rssi[16];
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};
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/*
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* Store the reference node coordinates here.
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* This will feed REFCOORD.
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*
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* Values should be stored here in Location Engine format:
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* 2 LS bits for the fractional part, 0.25 precision
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* 6 MS bits for the integral part.
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* Value range [0 , 63.75] (thus [0 , 255])
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*/
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struct refcoords {
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uint8_t x;
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uint8_t y;
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};
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