nes-proj/os/dev/radio.h
2017-09-01 15:29:00 +02:00

295 lines
9.5 KiB
C

/*
* Copyright (c) 2005, Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*
*/
/**
* \file
* Header file for the radio API
* \author
* Adam Dunkels <adam@sics.se>
* Joakim Eriksson <joakime@sics.se>
* Niclas Finne <nfi@sics.se>
* Nicolas Tsiftes <nvt@sics.se>
*/
/**
* \addtogroup dev
* @{
*/
/**
* \defgroup radio Radio API
*
* The radio API module defines a set of functions that a radio device
* driver must implement.
*
* @{
*/
#ifndef RADIO_H_
#define RADIO_H_
#include <stddef.h>
/**
* Each radio has a set of parameters that designate the current
* configuration and state of the radio. Parameters can either have
* values of type radio_value_t, or, when this type is insufficient, a
* generic object that is specified by a memory pointer and the size
* of the object.
*
* The radio_value_t type is set to an integer type that can hold most
* values used to configure the radio, and is therefore the most
* common type used for a parameter. Certain parameters require
* objects of a considerably larger size than radio_value_t, however,
* and in these cases the documentation below for the parameter will
* indicate this.
*
* All radio parameters that can vary during runtime are prefixed by
* "RADIO_PARAM", whereas those "parameters" that are guaranteed to
* remain immutable are prefixed by "RADIO_CONST". Each mutable
* parameter has a set of valid parameter values. When attempting to
* set a parameter to an invalid value, the radio will return
* RADIO_RESULT_INVALID_VALUE.
*
* Some radios support only a subset of the defined radio parameters.
* When trying to set or get such an unsupported parameter, the radio
* will return RADIO_RESULT_NOT_SUPPORTED.
*/
typedef int radio_value_t;
typedef unsigned radio_param_t;
enum {
/* Radio power mode determines if the radio is on
(RADIO_POWER_MODE_ON) or off (RADIO_POWER_MODE_OFF). */
RADIO_PARAM_POWER_MODE,
/*
* Channel used for radio communication. The channel depends on the
* communication standard used by the radio. The values can range
* from RADIO_CONST_CHANNEL_MIN to RADIO_CONST_CHANNEL_MAX.
*/
RADIO_PARAM_CHANNEL,
/* Personal area network identifier, which is used by the address filter. */
RADIO_PARAM_PAN_ID,
/* Short address (16 bits) for the radio, which is used by the address
filter. */
RADIO_PARAM_16BIT_ADDR,
/*
* Radio receiver mode determines if the radio has address filter
* (RADIO_RX_MODE_ADDRESS_FILTER) and auto-ACK (RADIO_RX_MODE_AUTOACK)
* enabled. This parameter is set as a bit mask.
*/
RADIO_PARAM_RX_MODE,
/*
* Radio transmission mode determines if the radio has send on CCA
* (RADIO_TX_MODE_SEND_ON_CCA) enabled or not. This parameter is set
* as a bit mask.
*/
RADIO_PARAM_TX_MODE,
/*
* Transmission power in dBm. The values can range from
* RADIO_CONST_TXPOWER_MIN to RADIO_CONST_TXPOWER_MAX.
*
* Some radios restrict the available values to a subset of this
* range. If an unavailable TXPOWER value is requested to be set,
* the radio may select another TXPOWER close to the requested
* one. When getting the value of this parameter, the actual value
* used by the radio will be returned.
*/
RADIO_PARAM_TXPOWER,
/*
* Clear channel assessment threshold in dBm. This threshold
* determines the minimum RSSI level at which the radio will assume
* that there is a packet in the air.
*
* The CCA threshold must be set to a level above the noise floor of
* the deployment. Otherwise mechanisms such as send-on-CCA and
* low-power-listening duty cycling protocols may not work
* correctly. Hence, the default value of the system may not be
* optimal for any given deployment.
*/
RADIO_PARAM_CCA_THRESHOLD,
/* Received signal strength indicator in dBm. */
RADIO_PARAM_RSSI,
/* RSSI of the last received packet */
RADIO_PARAM_LAST_RSSI,
/* Link quality of the last received packet */
RADIO_PARAM_LAST_LINK_QUALITY,
/*
* Long (64 bits) address for the radio, which is used by the address filter.
* The address is specified in network byte order.
*
* Because this parameter value is larger than what fits in radio_value_t,
* it needs to be used with radio.get_object()/set_object().
*/
RADIO_PARAM_64BIT_ADDR,
/* Last packet timestamp, of type rtimer_clock_t.
* Because this parameter value mat be larger than what fits in radio_value_t,
* it needs to be used with radio.get_object()/set_object(). */
RADIO_PARAM_LAST_PACKET_TIMESTAMP,
/* Constants (read only) */
/* The lowest radio channel. */
RADIO_CONST_CHANNEL_MIN,
/* The highest radio channel. */
RADIO_CONST_CHANNEL_MAX,
/* The minimum transmission power in dBm. */
RADIO_CONST_TXPOWER_MIN,
/* The maximum transmission power in dBm. */
RADIO_CONST_TXPOWER_MAX
};
/* Radio power modes */
enum {
RADIO_POWER_MODE_OFF,
RADIO_POWER_MODE_ON
};
/**
* The radio reception mode controls address filtering and automatic
* transmission of acknowledgements in the radio (if such operations
* are supported by the radio). A single parameter is used to allow
* setting these features simultaneously as an atomic operation.
*
* To enable both address filter and transmissions of automatic
* acknowledgments:
*
* NETSTACK_RADIO.set_value(RADIO_PARAM_RX_MODE,
* RADIO_RX_MODE_ADDRESS_FILTER | RADIO_RX_MODE_AUTOACK);
*/
#define RADIO_RX_MODE_ADDRESS_FILTER (1 << 0)
#define RADIO_RX_MODE_AUTOACK (1 << 1)
#define RADIO_RX_MODE_POLL_MODE (1 << 2)
/**
* The radio transmission mode controls whether transmissions should
* be done using clear channel assessment (if supported by the
* radio). If send-on-CCA is enabled, the radio's send function will
* wait for a radio-specific time window for the channel to become
* clear. If this does not happen, the send function will return
* RADIO_TX_COLLISION.
*/
#define RADIO_TX_MODE_SEND_ON_CCA (1 << 0)
/* Radio return values when setting or getting radio parameters. */
typedef enum {
RADIO_RESULT_OK,
RADIO_RESULT_NOT_SUPPORTED,
RADIO_RESULT_INVALID_VALUE,
RADIO_RESULT_ERROR
} radio_result_t;
/* Radio return values for transmissions. */
enum {
RADIO_TX_OK,
RADIO_TX_ERR,
RADIO_TX_COLLISION,
RADIO_TX_NOACK,
};
/**
* The structure of a device driver for a radio in Contiki.
*/
struct radio_driver {
int (* init)(void);
/** Prepare the radio with a packet to be sent. */
int (* prepare)(const void *payload, unsigned short payload_len);
/** Send the packet that has previously been prepared. */
int (* transmit)(unsigned short transmit_len);
/** Prepare & transmit a packet. */
int (* send)(const void *payload, unsigned short payload_len);
/** Read a received packet into a buffer. */
int (* read)(void *buf, unsigned short buf_len);
/** Perform a Clear-Channel Assessment (CCA) to find out if there is
a packet in the air or not. */
int (* channel_clear)(void);
/** Check if the radio driver is currently receiving a packet */
int (* receiving_packet)(void);
/** Check if the radio driver has just received a packet */
int (* pending_packet)(void);
/** Turn the radio on. */
int (* on)(void);
/** Turn the radio off. */
int (* off)(void);
/** Get a radio parameter value. */
radio_result_t (* get_value)(radio_param_t param, radio_value_t *value);
/** Set a radio parameter value. */
radio_result_t (* set_value)(radio_param_t param, radio_value_t value);
/**
* Get a radio parameter object. The argument 'dest' must point to a
* memory area of at least 'size' bytes, and this memory area will
* contain the parameter object if the function succeeds.
*/
radio_result_t (* get_object)(radio_param_t param, void *dest, size_t size);
/**
* Set a radio parameter object. The memory area referred to by the
* argument 'src' will not be accessed after the function returns.
*/
radio_result_t (* set_object)(radio_param_t param, const void *src,
size_t size);
};
#endif /* RADIO_H_ */
/** @} */
/** @} */