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499 lines
13 KiB
C
499 lines
13 KiB
C
/*
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* Copyright (c) 2011, George Oikonomou - <oikonomou@users.sourceforge.net>
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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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* Implementation of the cc2530 RF driver
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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 "contiki.h"
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#include "dev/radio.h"
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#include "dev/cc2530-rf.h"
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#include "cc253x.h"
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#include "sfr-bits.h"
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#include "sys/clock.h"
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#include "sys/rtimer.h"
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#include "net/packetbuf.h"
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#include "net/rime/rimestats.h"
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#include "net/rime/rimeaddr.h"
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#include "net/netstack.h"
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#include <string.h>
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/*---------------------------------------------------------------------------*/
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#define CHECKSUM_LEN 2
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/*---------------------------------------------------------------------------*/
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#if CC2530_RF_CONF_LEDS
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#define CC2530_RF_LEDS CC2530_RF_CONF_LEDS
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#else
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#define CC2530_RF_LEDS 0
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#endif
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#if CC2530_RF_LEDS
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#include "dev/leds.h"
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#define RF_RX_LED_ON() leds_on(LEDS_RED);
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#define RF_RX_LED_OFF() leds_off(LEDS_RED);
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#define RF_TX_LED_ON() leds_on(LEDS_GREEN);
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#define RF_TX_LED_OFF() leds_off(LEDS_GREEN);
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#else
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#define RF_RX_LED_ON()
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#define RF_RX_LED_OFF()
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#define RF_TX_LED_ON()
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#define RF_TX_LED_OFF()
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#endif
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/*---------------------------------------------------------------------------*/
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#define DEBUG 0
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#if DEBUG
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#include "debug.h"
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#define PUTSTRING(...) putstring(__VA_ARGS__)
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#define PUTHEX(...) puthex(__VA_ARGS__)
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#else
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#define PUTSTRING(...)
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#define PUTHEX(...)
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#endif
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/*---------------------------------------------------------------------------*/
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/* Local RF Flags */
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#define RX_ACTIVE 0x80
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#define WAS_OFF 0x10
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#define RF_ON 0x01
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/* Bit Masks for the last byte in the RX FIFO */
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#define CRC_BIT_MASK 0x80
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#define LQI_BIT_MASK 0x7F
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/* RSSI Offset */
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#define RSSI_OFFSET 73
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/* 192 ms, radio off -> on interval */
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#define ONOFF_TIME RTIMER_ARCH_SECOND / 3125
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/*---------------------------------------------------------------------------*/
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#if CC2530_RF_CONF_HEXDUMP
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#include "dev/io-arch.h"
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static const uint8_t magic[] = { 0x53, 0x6E, 0x69, 0x66 }; /* Snif */
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#endif
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/*---------------------------------------------------------------------------*/
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#ifdef CC2530_RF_CONF_AUTOACK
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#define CC2530_RF_AUTOACK CC2530_RF_CONF_AUTOACK
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#else
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#define CC2530_RF_AUTOACK 1
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#endif
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/*---------------------------------------------------------------------------*/
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static uint8_t CC_AT_DATA rf_flags;
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static int on(void); /* prepare() needs our prototype */
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static int off(void); /* transmit() needs our prototype */
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static int channel_clear(void); /* transmit() needs our prototype */
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/*---------------------------------------------------------------------------*/
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int8_t
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cc2530_rf_channel_set(uint8_t channel)
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{
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PUTSTRING("RF: Set Chan\n");
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if((channel < CC2530_RF_CHANNEL_MIN) || (channel > CC2530_RF_CHANNEL_MAX)) {
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return -1;
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}
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/* Changes to FREQCTRL take effect after the next recalibration */
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off();
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FREQCTRL = (CC2530_RF_CHANNEL_MIN
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+ (channel - CC2530_RF_CHANNEL_MIN) * CC2530_RF_CHANNEL_SPACING);
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on();
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return (int8_t) channel;
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}
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/*---------------------------------------------------------------------------*/
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uint8_t
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cc2530_rf_power_set(uint8_t new_power)
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{
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PUTSTRING("RF: Set Power\n");
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/* off() */
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TXPOWER = new_power;
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/* on() */
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return TXPOWER;
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}
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/*---------------------------------------------------------------------------*/
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void
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cc2530_rf_set_addr(uint16_t pan)
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{
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#if RIMEADDR_SIZE==8 /* EXT_ADDR[7:0] is ignored when using short addresses */
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int i;
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for(i = (RIMEADDR_SIZE - 1); i >= 0; --i) {
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((uint8_t *)&EXT_ADDR0)[i] = rimeaddr_node_addr.u8[RIMEADDR_SIZE - 1 - i];
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}
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#endif
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PAN_ID0 = pan & 0xFF;
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PAN_ID1 = pan >> 8;
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SHORT_ADDR0 = rimeaddr_node_addr.u8[RIMEADDR_SIZE - 1];
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SHORT_ADDR1 = rimeaddr_node_addr.u8[RIMEADDR_SIZE - 2];
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}
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/*---------------------------------------------------------------------------*/
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/* Netstack API radio driver functions */
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/*---------------------------------------------------------------------------*/
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static int
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init(void)
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{
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PUTSTRING("RF: Init\n");
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if(rf_flags & RF_ON) {
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return 0;
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}
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#if CC2530_RF_LOW_POWER_RX
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/* Reduce RX power consumption current to 20mA at the cost of sensitivity */
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RXCTRL = 0x00;
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FSCTRL = 0x50;
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#else
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RXCTRL = 0x3F;
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FSCTRL = 0x55;
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#endif /* CC2530_RF_LOW_POWER_RX */
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CCACTRL0 = CC2530_RF_CCA_THRES;
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/*
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* According to the user guide, these registers must be updated from their
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* defaults for optimal performance
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*
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* Table 23-6, Sec. 23.15.1, p. 259
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*/
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TXFILTCFG = 0x09; /* TX anti-aliasing filter */
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AGCCTRL1 = 0x15; /* AGC target value */
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FSCAL1 = 0x00; /* Reduce the VCO leakage */
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/* Auto ACKs and CRC calculation, default RX and TX modes with FIFOs */
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FRMCTRL0 = FRMCTRL0_AUTOCRC;
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#if CC2530_RF_AUTOACK
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FRMCTRL0 |= FRMCTRL0_AUTOACK;
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#endif
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/* Disable source address matching and autopend */
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SRCMATCH = 0; /* investigate */
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/* MAX FIFOP threshold */
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FIFOPCTRL = CC2530_RF_MAX_PACKET_LEN;
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cc2530_rf_power_set(CC2530_RF_TX_POWER);
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cc2530_rf_channel_set(CC2530_RF_CHANNEL);
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RF_TX_LED_OFF();
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RF_RX_LED_OFF();
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rf_flags |= RF_ON;
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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static int
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prepare(const void *payload, unsigned short payload_len)
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{
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uint8_t i;
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PUTSTRING("RF: Prepare 0x");
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PUTHEX(payload_len + CHECKSUM_LEN);
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PUTSTRING(" bytes\n");
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/*
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* When we transmit in very quick bursts, make sure previous transmission
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* is not still in progress before re-writing to the TX FIFO
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*/
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while(FSMSTAT1 & FSMSTAT1_TX_ACTIVE);
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if((rf_flags & RX_ACTIVE) == 0) {
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on();
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}
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CC2530_CSP_ISFLUSHTX();
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PUTSTRING("RF: data = ");
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/* Send the phy length byte first */
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RFD = payload_len + CHECKSUM_LEN; /* Payload plus FCS */
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for(i = 0; i < payload_len; i++) {
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RFD = ((unsigned char *)(payload))[i];
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PUTHEX(((unsigned char *)(payload))[i]);
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}
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PUTSTRING("\n");
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/* Leave space for the FCS */
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RFD = 0;
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RFD = 0;
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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static int
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transmit(unsigned short transmit_len)
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{
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uint8_t counter;
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int ret = RADIO_TX_ERR;
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rtimer_clock_t t0;
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transmit_len; /* hush the warning */
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if(!(rf_flags & RX_ACTIVE)) {
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t0 = RTIMER_NOW();
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on();
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rf_flags |= WAS_OFF;
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while(RTIMER_CLOCK_LT(RTIMER_NOW(), t0 + ONOFF_TIME));
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}
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if(channel_clear() == CC2530_RF_CCA_BUSY) {
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RIMESTATS_ADD(contentiondrop);
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return RADIO_TX_COLLISION;
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}
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/*
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* prepare() double checked that TX_ACTIVE is low. If SFD is high we are
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* receiving. Abort transmission and bail out with RADIO_TX_COLLISION
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*/
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if(FSMSTAT1 & FSMSTAT1_SFD) {
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RIMESTATS_ADD(contentiondrop);
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return RADIO_TX_COLLISION;
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}
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/* Start the transmission */
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RF_TX_LED_ON();
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ENERGEST_OFF(ENERGEST_TYPE_LISTEN);
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ENERGEST_ON(ENERGEST_TYPE_TRANSMIT);
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CC2530_CSP_ISTXON();
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counter = 0;
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while(!(FSMSTAT1 & FSMSTAT1_TX_ACTIVE) && (counter++ < 3)) {
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clock_delay_usec(6);
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}
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if(!(FSMSTAT1 & FSMSTAT1_TX_ACTIVE)) {
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PUTSTRING("RF: TX never active.\n");
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CC2530_CSP_ISFLUSHTX();
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ret = RADIO_TX_ERR;
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} else {
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/* Wait for the transmission to finish */
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while(FSMSTAT1 & FSMSTAT1_TX_ACTIVE);
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ret = RADIO_TX_OK;
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}
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ENERGEST_OFF(ENERGEST_TYPE_TRANSMIT);
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ENERGEST_ON(ENERGEST_TYPE_LISTEN);
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if(rf_flags & WAS_OFF) {
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off();
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}
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RIMESTATS_ADD(lltx);
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RF_TX_LED_OFF();
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/* OK, sent. We are now ready to send more */
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return ret;
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}
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/*---------------------------------------------------------------------------*/
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static int
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send(void *payload, unsigned short payload_len)
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{
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prepare(payload, payload_len);
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return transmit(payload_len);
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}
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/*---------------------------------------------------------------------------*/
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static int
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read(void *buf, unsigned short bufsize)
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{
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uint8_t i;
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uint8_t len;
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uint8_t crc_corr;
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int8_t rssi;
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PUTSTRING("RF: Read\n");
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/* Check the length */
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len = RFD;
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/* Check for validity */
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if(len > CC2530_RF_MAX_PACKET_LEN) {
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/* Oops, we must be out of sync. */
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PUTSTRING("RF: bad sync\n");
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RIMESTATS_ADD(badsynch);
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CC2530_CSP_ISFLUSHRX();
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return 0;
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}
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if(len <= CC2530_RF_MIN_PACKET_LEN) {
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PUTSTRING("RF: too short\n");
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RIMESTATS_ADD(tooshort);
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CC2530_CSP_ISFLUSHRX();
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return 0;
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}
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if(len - CHECKSUM_LEN > bufsize) {
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PUTSTRING("RF: too long\n");
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RIMESTATS_ADD(toolong);
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CC2530_CSP_ISFLUSHRX();
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return 0;
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}
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#if CC2530_RF_CONF_HEXDUMP
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/* If we reach here, chances are the FIFO is holding a valid frame */
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io_arch_writeb(magic[0]);
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io_arch_writeb(magic[1]);
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io_arch_writeb(magic[2]);
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io_arch_writeb(magic[3]);
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io_arch_writeb(len);
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#endif
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RF_RX_LED_ON();
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PUTSTRING("RF: read (0x");
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PUTHEX(len);
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PUTSTRING(" bytes) = ");
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len -= CHECKSUM_LEN;
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for(i = 0; i < len; ++i) {
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((unsigned char *)(buf))[i] = RFD;
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#if CC2530_RF_CONF_HEXDUMP
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io_arch_writeb(((unsigned char *)(buf))[i]);
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#endif
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PUTHEX(((unsigned char *)(buf))[i]);
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}
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PUTSTRING("\n");
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/* Read the RSSI and CRC/Corr bytes */
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rssi = ((int8_t) RFD) - RSSI_OFFSET;
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crc_corr = RFD;
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#if CC2530_RF_CONF_HEXDUMP
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io_arch_writeb(rssi);
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io_arch_writeb(crc_corr);
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io_arch_flush();
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#endif
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/* MS bit CRC OK/Not OK, 7 LS Bits, Correlation value */
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if(crc_corr & CRC_BIT_MASK) {
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packetbuf_set_attr(PACKETBUF_ATTR_RSSI, rssi);
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packetbuf_set_attr(PACKETBUF_ATTR_LINK_QUALITY, crc_corr & LQI_BIT_MASK);
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RIMESTATS_ADD(llrx);
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} else {
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RIMESTATS_ADD(badcrc);
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CC2530_CSP_ISFLUSHRX();
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RF_RX_LED_OFF();
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return 0;
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}
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/* If FIFOP==1 and FIFO==0 then we had a FIFO overflow at some point. */
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if((FSMSTAT1 & (FSMSTAT1_FIFO | FSMSTAT1_FIFOP)) == FSMSTAT1_FIFOP) {
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/*
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* If we reach here means that there might be more intact packets in the
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* FIFO despite the overflow. This can happen with bursts of small packets.
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*
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* Only flush if the FIFO is actually empty. If not, then next pass we will
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* pick up one more packet or flush due to an error.
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*/
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if(!RXFIFOCNT) {
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CC2530_CSP_ISFLUSHRX();
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}
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}
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RF_RX_LED_OFF();
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return (len);
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}
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/*---------------------------------------------------------------------------*/
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static int
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channel_clear(void)
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{
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if(FSMSTAT1 & FSMSTAT1_CCA) {
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return CC2530_RF_CCA_CLEAR;
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}
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return CC2530_RF_CCA_BUSY;
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}
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/*---------------------------------------------------------------------------*/
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static int
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receiving_packet(void)
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{
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PUTSTRING("RF: Receiving\n");
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/*
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* SFD high while transmitting and receiving.
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* TX_ACTIVE high only when transmitting
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*
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* FSMSTAT1 & (TX_ACTIVE | SFD) == SFD <=> receiving
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*/
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return (FSMSTAT1 & (FSMSTAT1_TX_ACTIVE | FSMSTAT1_SFD) == FSMSTAT1_SFD);
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}
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/*---------------------------------------------------------------------------*/
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static int
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pending_packet(void)
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{
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return (FSMSTAT1 & FSMSTAT1_FIFOP);
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}
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/*---------------------------------------------------------------------------*/
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static int
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on(void)
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{
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if(!(rf_flags & RX_ACTIVE)) {
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CC2530_CSP_ISFLUSHRX();
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CC2530_CSP_ISRXON();
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rf_flags |= RX_ACTIVE;
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}
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ENERGEST_ON(ENERGEST_TYPE_LISTEN);
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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static int
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off(void)
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{
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CC2530_CSP_ISRFOFF();
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CC2530_CSP_ISFLUSHRX();
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rf_flags &= ~RX_ACTIVE;
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ENERGEST_OFF(ENERGEST_TYPE_LISTEN);
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return 1;
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}
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/*---------------------------------------------------------------------------*/
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const struct radio_driver cc2530_rf_driver = {
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init,
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prepare,
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transmit,
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send,
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read,
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channel_clear,
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receiving_packet,
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pending_packet,
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on,
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off,
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};
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/*---------------------------------------------------------------------------*/
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