748 lines
18 KiB
C
748 lines
18 KiB
C
/*
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* Copyright (c) 2005, 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: tr1001.c,v 1.6 2007/03/28 09:52:35 joxe Exp $
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*/
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/**
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* \addtogroup esb
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* @{
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*/
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/**
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* \defgroup tr1001 TR1001 radio tranciever device driver
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* @{
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*/
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/**
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* \file
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* Device driver and packet framing for the RFM-TR1001 radio module.
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* \author Adam Dunkels <adam@sics.se>
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*
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* This file implements a device driver for the RFM-TR1001 radio
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* tranciever.
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*
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*/
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#include "contiki-esb.h"
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#include "lib/me.h"
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#include "lib/crc16.h"
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#include "net/tr1001-drv.h"
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#include <io.h>
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#include <signal.h>
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#include <string.h>
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#define RXSTATE_READY 0
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#define RXSTATE_RECEVING 1
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#define RXSTATE_FULL 2
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#define SYNCH1 0x3c
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#define SYNCH2 0x03
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#if TR1001_STATISTICS
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static unsigned short sstrength_dropped,
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sstrength_max, sstrength_min, tmp_sstrength_max, tmp_sstrength_min;
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/* The number of dropped packets */
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static unsigned short packets_err;
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/* The number of accepted packets */
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static unsigned short packets_ok;
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#endif /* TR1001_STATISTICS */
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/*
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* The buffer which holds incoming data.
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*/
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#define RXBUFSIZE UIP_BUFSIZE
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unsigned char tr1001_rxbuf[RXBUFSIZE];
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/*
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* The length of the packet that currently is being received.
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*/
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static unsigned short tr1001_rxlen = 0;
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/*
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* The reception state.
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*/
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volatile unsigned char tr1001_rxstate = RXSTATE_READY;
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static u8_t radio_active;
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static u16_t rxcrc, rxcrctmp;
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/*
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* The structure of the packet header.
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*/
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struct tr1001_hdr {
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u8_t len[2]; /**< The 16-bit length of the packet in network byte
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order. */
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};
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/*
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* The length of the packet header.
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*/
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#define TR1001_HDRLEN sizeof(struct tr1001_hdr)
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#define OFF 0
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#define ON 1
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static u8_t onoroff = ON;
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#define NUM_SYNCHBYTES 4
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void tr1001_default_rxhandler(unsigned char c);
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PT_THREAD(tr1001_default_rxhandler_pt(unsigned char c));
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static struct pt rxhandler_pt;
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/*
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* This timer is used to keep track of when the last byte was received
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* over the radio. If the inter-byte time is too large, the packet
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* currently being received is discarded and a new packet reception is
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* initiated.
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*/
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static struct timer rxtimer;
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static unsigned short tmp_sstrength, sstrength;
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#define DEBUG 0
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#if DEBUG
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#include <stdio.h>
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#define LOG(...) printf(__VA_ARGS__)
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#else
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#define LOG(...)
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#endif
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/*---------------------------------------------------------------------------*/
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#if TR1001_STATISTICS
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#define PACKET_DROPPED(bytes) do { \
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if(packets_err < ~0) {\
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packets_err++;\
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}\
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sstrength_dropped = ((bytes) == 0 ? 0 : ((tmp_sstrength / (bytes)) << 1));\
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} while(0)
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#define PACKET_ACCEPTED() do {\
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if(packets_ok < ~0) {\
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packets_ok++;\
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}\
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} while(0);
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#else
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#define PACKET_DROPPED(bytes)
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#define PACKET_ACCEPTED()
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#endif /* TR1001_STATISTICS */
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/*---------------------------------------------------------------------------*/
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/*
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* Turn on data transmission in On-Off-Keyed mode.
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*/
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static void
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txook(void)
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{
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P3SEL = 0xf0;
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P5OUT |= 0x40;
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P5OUT &= 0x7f;
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}
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/*---------------------------------------------------------------------------*/
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/*
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* Turn on data reception for the radio tranceiver.
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*/
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static void
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rxon(void)
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{
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P3SEL = 0xe0;
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P5OUT |= 0xc0;
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/* Enable the receiver. */
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ME1 |= URXE0;
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/* Turn on receive interrupt. */
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IE1 |= URXIE0;
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}
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/*---------------------------------------------------------------------------*/
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/*
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* Turn off data reception for the radio tranceiver.
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*/
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static void
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rxoff(void)
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{
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P5OUT &= 0x3f;
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/* Disable the receiver. */
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ME1 &= ~URXE0;
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/* Turn off receive interrupt. */
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IE1 &= ~URXIE0;
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}
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/*---------------------------------------------------------------------------*/
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/*
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* Clear the recevie buffer and reset the receiver state.
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*/
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static void
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rxclear(void)
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{
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tr1001_rxstate = RXSTATE_READY;
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}
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/*---------------------------------------------------------------------------*/
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/*
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* Turn TR1001 radio transceiver off.
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*/
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/*---------------------------------------------------------------------------*/
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void
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radio_off(void)
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{
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onoroff = OFF;
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rxoff();
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rxclear();
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}
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/*---------------------------------------------------------------------------*/
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/*
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* Turn TR1001 radio transceiver on.
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*/
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/*---------------------------------------------------------------------------*/
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void
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radio_on(void)
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{
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onoroff = ON;
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rxon();
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rxclear();
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}
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/*---------------------------------------------------------------------------*/
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/*
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* Send a byte of data over the radio.
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*
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* \param b The byte to be sent.
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*/
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static void
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send(unsigned char b)
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{
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clock_time_t start;
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start = clock_time();
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/* Wait until the USART0 TX buffer is ready. */
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while((IFG1 & UTXIFG0) == 0) {
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/* Wait no more than one second. */
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if((clock_time_t)(clock_time() - start) > (clock_time_t)CLOCK_SECOND) {
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break;
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}
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}
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/* Send the byte. */
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TXBUF0 = b;
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}
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/*---------------------------------------------------------------------------*/
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/*
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* Send a byte of data and its logical negation (all bits inverted)
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* over the radio.
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*
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* \param b The byte to be sent.
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*/
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static void
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send2(unsigned char b)
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{
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u16_t m;
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m = me_encode(b);
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send(m >> 8);
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send(m & 0xff);
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}
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static u16_t
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send2_crc16(unsigned char b, u16_t crcacc)
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{
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u16_t m;
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m = me_encode(b);
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send(m >> 8);
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send(m & 0xff);
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return crc16_add(b, crcacc);
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}
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/*---------------------------------------------------------------------------*/
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void
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tr1001_set_txpower(unsigned char p)
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{
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int i;
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/* Clamp maximum power. */
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if(p > 100) {
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p = 100;
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}
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/* First, run the potentiometer down to zero so that we know the
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start value of the potentiometer. */
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P2OUT &= 0xDF; /* P25 = 0 (down selected) */
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P2OUT &= 0xBF; /* P26 = 0 (chipselect on) */
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for(i = 0; i < 102; ++i) {
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P2OUT &= 0xEF; /* P24 = 0 (inc) */
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P2OUT |= 0x10;
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}
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/* Now, start to increase the value of the potentiometer until it
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reaches the desired value.*/
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P2OUT |= 0x20; /* P25 = 1 (up selected) */
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for(i = 0; i < p; ++i) {
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P2OUT &= 0xEF; /* P24 = 0 (inc) */
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P2OUT |= 0x10;
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}
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P2OUT |= 0x40; /* P26 = 1 (chipselect off) */
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}
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/*---------------------------------------------------------------------------*/
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void
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tr1001_init(void)
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{
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PT_INIT(&rxhandler_pt);
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#if TR1001_STATISTICS
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packets_ok = packets_err = 0;
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sstrength_dropped = 0;
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sstrength_min = 0xFFFF;
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sstrength_max = 0;
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#endif /* TR1001_STATISTICS */
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UCTL0 = CHAR; /* 8-bit character */
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UTCTL0 = SSEL1; /* UCLK = SMCLK */
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tr1001_set_speed(TR1001_19200);
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ME1 |= UTXE0 + URXE0; /* Enable USART0 TXD/RXD */
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/* Turn on receive interrupt. */
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IE1 |= URXIE0;
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timer_set(&rxtimer, CLOCK_SECOND / 4);
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radio_on();
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tr1001_set_txpower(100);
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/* Reset reception state. */
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rxclear();
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}
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/*---------------------------------------------------------------------------*/
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interrupt (UART0RX_VECTOR)
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tr1001_rxhandler(void)
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{
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tr1001_default_rxhandler_pt(RXBUF0);
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if(tr1001_rxstate == RXSTATE_FULL) {
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LPM_AWAKE();
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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dump_packet(int len)
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{
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int i;
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for(i = 0; i < len; ++i) {
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LOG("%d: 0x%02x\n", i, tr1001_rxbuf[i]);
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}
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}
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/*---------------------------------------------------------------------------*/
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PT_THREAD(tr1001_default_rxhandler_pt(unsigned char incoming_byte))
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{
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static unsigned char rxtmp, tmppos;
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if(timer_expired(&rxtimer) && tr1001_rxstate != RXSTATE_FULL) {
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PT_INIT(&rxhandler_pt);
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}
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timer_restart(&rxtimer);
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if(tr1001_rxstate == RXSTATE_RECEVING) {
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unsigned short signal = radio_sensor_signal;
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tmp_sstrength += (signal >> 2);
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if(signal < tmp_sstrength_min) {
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tmp_sstrength_min = signal;
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}
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if(signal > tmp_sstrength_max) {
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tmp_sstrength_max = signal;
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}
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}
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PT_BEGIN(&rxhandler_pt);
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while(1) {
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/* Reset reception state. */
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rxclear();
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/* Wait until we receive the first syncronization byte. */
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PT_WAIT_UNTIL(&rxhandler_pt, incoming_byte == SYNCH1);
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tr1001_rxstate = RXSTATE_RECEVING;
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/* Read all incoming syncronization bytes. */
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PT_WAIT_WHILE(&rxhandler_pt, incoming_byte == SYNCH1);
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/* We should receive the second synch byte by now, otherwise we'll
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restart the protothread. */
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if(incoming_byte != SYNCH2) {
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PT_RESTART(&rxhandler_pt);
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}
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/* Start signal strength measurement */
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tmp_sstrength = 0;
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tmp_sstrength_max = 0;
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tmp_sstrength_min = 0xFFFF;
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/* Reset the CRC. */
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rxcrc = 0xffff;
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/* Read packet header. */
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for(tmppos = 0; tmppos < TR1001_HDRLEN; ++tmppos) {
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/* Wait for the first byte of the packet to arrive. */
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PT_YIELD(&rxhandler_pt);
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/* If the incoming byte isn't a valid Manchester encoded byte,
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we start again from the beinning. */
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if(!me_valid(incoming_byte)) {
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beep_beep(1000);
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LOG("Incorrect manchester in header at byte %d/1\n", tmppos);
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PACKET_DROPPED(tmppos);
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PT_RESTART(&rxhandler_pt);
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}
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rxtmp = me_decode8(incoming_byte);
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/* Wait for the next byte to arrive. */
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PT_YIELD(&rxhandler_pt);
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if(!me_valid(incoming_byte)) {
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beep_beep(1000);
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LOG("Incorrect manchester in header at byte %d/2\n", tmppos);
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PACKET_DROPPED(tmppos + 1);
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PT_RESTART(&rxhandler_pt);
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}
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/* Put together the two bytes into a single Manchester decoded
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byte. */
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tr1001_rxbuf[tmppos] = (rxtmp << 4) | me_decode8(incoming_byte);
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/* Calculate the CRC. */
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rxcrc = crc16_add(tr1001_rxbuf[tmppos], rxcrc);
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}
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/* Since we've got the header, we can grab the length from it. */
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tr1001_rxlen = ((((struct tr1001_hdr *)tr1001_rxbuf)->len[0] << 8) +
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((struct tr1001_hdr *)tr1001_rxbuf)->len[1]);
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/* If the length is longer than we can handle, we'll start from
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the beginning. */
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if(tmppos + tr1001_rxlen > sizeof(tr1001_rxbuf)) {
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PACKET_DROPPED(tmppos);
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PT_RESTART(&rxhandler_pt);
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}
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/* Read packet data. */
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for(; tmppos < tr1001_rxlen + TR1001_HDRLEN; ++tmppos) {
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PT_YIELD(&rxhandler_pt);
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if(!me_valid(incoming_byte)) {
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LOG("Incorrect manchester 0x%02x at byte %d/1\n", incoming_byte,
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tmppos - TR1001_HDRLEN);
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beep_beep(1000);
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PACKET_DROPPED(tmppos);
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PT_RESTART(&rxhandler_pt);
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}
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rxtmp = me_decode8(incoming_byte);
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PT_YIELD(&rxhandler_pt);
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if(!me_valid(incoming_byte)) {
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LOG("Incorrect manchester at byte %d/2\n", tmppos - TR1001_HDRLEN);
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beep_beep(1000);
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PACKET_DROPPED(tmppos + 1);
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PT_RESTART(&rxhandler_pt);
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}
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tr1001_rxbuf[tmppos] = (rxtmp << 4) | me_decode8(incoming_byte);
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rxcrc = crc16_add(tr1001_rxbuf[tmppos], rxcrc);
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}
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/* Read the frame CRC. */
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for(tmppos = 0; tmppos < 4; ++tmppos) {
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PT_YIELD(&rxhandler_pt);
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if(!me_valid(incoming_byte)) {
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beep_beep(1000);
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PACKET_DROPPED(tr1001_rxlen + TR1001_HDRLEN);
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PT_RESTART(&rxhandler_pt);
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}
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rxcrctmp = (rxcrctmp << 4) | me_decode8(incoming_byte);
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}
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if(rxcrctmp == rxcrc) {
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/* A full packet has been received and the CRC checks out. We'll
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request the driver to take care of the incoming data. */
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PACKET_ACCEPTED();
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tr1001_drv_request_poll();
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/* We'll set the receive state flag to signal that a full frame
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is present in the buffer, and we'll wait until the buffer has
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been taken care of. */
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tr1001_rxstate = RXSTATE_FULL;
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PT_WAIT_UNTIL(&rxhandler_pt, tr1001_rxstate != RXSTATE_FULL);
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} else {
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LOG("Incorrect CRC");
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beep_beep(1000);
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PACKET_DROPPED(tr1001_rxlen + TR1001_HDRLEN);
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}
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}
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PT_END(&rxhandler_pt);
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}
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/*---------------------------------------------------------------------------*/
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/*
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* Prepare a transmission.
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*
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* This function does the necessary setup before a packet can be sent
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* out.
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*/
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static void
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prepare_transmission(int synchbytes)
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{
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int i;
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/* Delay the transmission for a short random duration. */
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clock_delay(random_rand() & 0x3ff);
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/* Check that we don't currently are receiveing a packet, and if so
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we wait until the reception has been completed. Reception is done
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with interrupts so it is OK for us to wait in a while() loop. */
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while(tr1001_rxstate == RXSTATE_RECEVING &&
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!timer_expired(&rxtimer)) {
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/* Delay the transmission for a short random duration. */
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clock_delay(random_rand() & 0x7ff);
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}
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/* Turn on OOK mode with transmission. */
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txook();
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/* According to the datasheet, the transmitter must wait for 12 us
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in order to settle. Empirical tests show that is it better to
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wait for something like 283 us... */
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clock_delay(200);
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|
/* Transmit preamble and synch bytes. */
|
|
|
|
|
|
for(i = 0; i < 20; ++i) {
|
|
send(0xaa);
|
|
}
|
|
/* send(0xaa);
|
|
send(0xaa);*/
|
|
send(0xff);
|
|
|
|
for(i = 0; i < synchbytes; ++i) {
|
|
send(SYNCH1);
|
|
}
|
|
send(SYNCH2);
|
|
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
u8_t
|
|
tr1001_send(u8_t *packet, u16_t len)
|
|
{
|
|
int i;
|
|
u16_t crc16;
|
|
|
|
LOG("tr1001_send: sending %d bytes\n", len);
|
|
|
|
/* Prepare the transmission. */
|
|
prepare_transmission(NUM_SYNCHBYTES);
|
|
|
|
radio_active = 1;
|
|
|
|
crc16 = 0xffff;
|
|
|
|
/* Send packet header. */
|
|
crc16 = send2_crc16(len >> 8, crc16);
|
|
crc16 = send2_crc16(len & 0xff, crc16);
|
|
|
|
/* Send packet data. */
|
|
for(i = 0; i < len; ++i) {
|
|
crc16 = send2_crc16(packet[i], crc16);
|
|
}
|
|
|
|
/* Send CRC */
|
|
send2(crc16 >> 8);
|
|
send2(crc16 & 0xff);
|
|
|
|
/* Send trailing bytes. */
|
|
send(0x33);
|
|
send(0xcc);
|
|
send(0x33);
|
|
send(0xcc);
|
|
|
|
/* Turn on (or off) reception again. */
|
|
if(onoroff == ON) {
|
|
rxon();
|
|
rxclear();
|
|
} else {
|
|
rxoff();
|
|
rxclear();
|
|
}
|
|
|
|
return UIP_FW_OK;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
unsigned short
|
|
tr1001_poll(u8_t *buf, u16_t bufsize)
|
|
{
|
|
unsigned short tmplen;
|
|
|
|
if(tr1001_rxstate == RXSTATE_FULL) {
|
|
|
|
dump_packet(tr1001_rxlen + 2);
|
|
|
|
tmplen = tr1001_rxlen;
|
|
|
|
/* if(tmplen > UIP_BUFSIZE - (UIP_LLH_LEN - TR1001_HDRLEN)) {
|
|
tmplen = UIP_BUFSIZE - (UIP_LLH_LEN - TR1001_HDRLEN);
|
|
}*/
|
|
if(tmplen > bufsize - TR1001_HDRLEN) {
|
|
tmplen = bufsize - TR1001_HDRLEN;
|
|
}
|
|
|
|
memcpy(buf, &tr1001_rxbuf[TR1001_HDRLEN], tmplen);
|
|
|
|
/* header + content + CRC */
|
|
sstrength = (tmp_sstrength / (TR1001_HDRLEN + tr1001_rxlen + 2)) << 1;
|
|
sstrength_max = tmp_sstrength_max;
|
|
sstrength_min = tmp_sstrength_min;
|
|
|
|
rxclear();
|
|
|
|
LOG("tr1001_poll: got %d bytes\n", tmplen);
|
|
|
|
return tmplen;
|
|
}
|
|
return 0;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
void
|
|
tr1001_set_speed(unsigned char speed)
|
|
{
|
|
|
|
if(speed == TR1001_19200) {
|
|
/* Set TR1001 to 19200 */
|
|
UBR00 = 0x80; /* 2,457MHz/19200 = 128 -> 0x80 */
|
|
UBR10 = 0x00; /* */
|
|
UMCTL0 = 0x00; /* no modulation */
|
|
} else if(speed == TR1001_38400) {
|
|
/* Set TR1001 to 38400 */
|
|
UBR00 = 0x40; /* 2,457MHz/38400 = 64 -> 0x40 */
|
|
UBR10 = 0x00; /* */
|
|
UMCTL0 = 0x00; /* no modulation */
|
|
} else if(speed == TR1001_57600) {
|
|
UBR00 = 0x2a; /* 2,457MHz/57600 = 42.7 -> 0x2A */
|
|
UBR10 = 0x00; /* */
|
|
UMCTL0 = 0x5b; /* */
|
|
} else if(speed == TR1001_115200) {
|
|
UBR00 = 0x15; /* 2,457MHz/115200 = 21.4 -> 0x15 */
|
|
UBR10 = 0x00; /* */
|
|
UMCTL0 = 0x4a; /* */
|
|
} else {
|
|
tr1001_set_speed(TR1001_19200);
|
|
}
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
unsigned short
|
|
tr1001_sstrength(void)
|
|
{
|
|
return sstrength;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
#if TR1001_STATISTICS
|
|
unsigned short
|
|
tr1001_packets_ok(void)
|
|
{
|
|
return packets_ok;
|
|
}
|
|
#endif /* TR1001_STATISTICS */
|
|
/*---------------------------------------------------------------------------*/
|
|
#if TR1001_STATISTICS
|
|
unsigned short
|
|
tr1001_packets_dropped(void)
|
|
{
|
|
return packets_err;
|
|
}
|
|
#endif /* TR1001_STATISTICS */
|
|
/*---------------------------------------------------------------------------*/
|
|
#if TR1001_STATISTICS
|
|
void
|
|
tr1001_clear_packets(void)
|
|
{
|
|
packets_ok = packets_err = 0;
|
|
}
|
|
#endif /* TR1001_STATISTICS */
|
|
/*---------------------------------------------------------------------------*/
|
|
#if TR1001_STATISTICS
|
|
unsigned short
|
|
tr1001_sstrength_value(unsigned int type)
|
|
{
|
|
switch(type) {
|
|
case TR1001_SSTRENGTH_DROPPED:
|
|
return sstrength_dropped;
|
|
case TR1001_SSTRENGTH_MAX:
|
|
return sstrength_max;
|
|
case TR1001_SSTRENGTH_MIN:
|
|
return sstrength_min < sstrength_max ? sstrength_min : 0;
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
#endif /* TR1001_STATISTICS */
|
|
/*---------------------------------------------------------------------------*/
|
|
unsigned char
|
|
tr1001_active(void)
|
|
{
|
|
return radio_active;
|
|
}
|
|
/*--------------------------------------------------------------------------*/
|
|
void
|
|
tr1001_clear_active(void)
|
|
{
|
|
radio_active = 0;
|
|
}
|
|
/*---------------------------------------------------------------------------*/
|
|
/** @} */
|
|
/** @} */
|