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/*
* Copyright (C) 2014 INRIA
* Copyright (C) 2015 Freie Universität Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @defgroup drivers_xbee XBee driver
* @ingroup drivers_netdev
* @brief High-level driver for the XBee S1 802.15.4 modem
* @{
*
* @file
* @brief High-level driver for the XBee S1 802.15.4 modem
*
* @author Kévin Roussel <kevin.roussel@inria.fr>
* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
*/
#ifndef XBEE_H_
#define XBEE_H_
#include <stdint.h>
#include "mutex.h"
#include "xtimer.h"
#include "periph/uart.h"
#include "periph/gpio.h"
#include "net/gnrc.h"
#include "net/ieee802154.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Maximum payload length that can be send
*/
#ifdef MODULE_XBEE_ENCRYPTION
#define XBEE_MAX_PAYLOAD_LENGTH (95U)
#else
#define XBEE_MAX_PAYLOAD_LENGTH (100U)
#endif
/**
* @brief Maximum packet length, including XBee API frame overhead
*/
#define XBEE_MAX_PKT_LENGTH (115U)
/**
* @brief Maximum length of a command response
*/
#define XBEE_MAX_RESP_LENGTH (16U)
/**
* @brief Default protocol for data that is coming in
*/
#ifdef MODULE_GNRC_SIXLOWPAN
#define XBEE_DEFAULT_PROTOCOL (GNRC_NETTYPE_SIXLOWPAN)
#else
#define XBEE_DEFAULT_PROTOCOL (GNRC_NETTYPE_UNDEF)
#endif
/**
* @brief Default PAN ID used after initialization
*/
#define XBEE_DEFAULT_PANID (IEEE802154_DEFAULT_PANID)
/**
* @brief Default channel used after initialization
*/
#define XBEE_DEFAULT_CHANNEL (IEEE802154_DEFAULT_CHANNEL)
/**
* @name Address flags
* @{
*/
/**
* @brief Use long addresses if not otherwise defined when set, use short
* addresses when unset.
*/
#define XBEE_ADDR_FLAGS_LONG (0x80)
/**
* @}
*/
/**
* @brief States of the internal FSM for handling incoming UART frames
*
* Incoming data frames on the UART interfaces are handled using a finite state
* machine (FSM) in the UARTs RX interrupt handler. The FSM is needed to extract
* frame specific data as the frame size, frame type, and checksums.
*/
typedef enum {
XBEE_INT_STATE_IDLE, /**< waiting for the beginning of a new frame */
XBEE_INT_STATE_SIZE1, /**< waiting for the first byte (MSB) of the
* frame size field */
XBEE_INT_STATE_SIZE2, /**< waiting for the second byte (LSB) of the
* frame size field */
XBEE_INT_STATE_TYPE, /**< waiting for the frame type field */
XBEE_INT_STATE_RESP, /**< handling incoming data for AT command
* responses */
XBEE_INT_STATE_RX, /**< handling incoming data when receiving radio
* packets */
} xbee_rx_state_t;
/**
* @brief XBee device descriptor
*/
typedef struct {
/* netdev fields */
gnrc_netdev_driver_t const *driver; /**< pointer to the devices interface */
gnrc_netdev_event_cb_t event_cb; /**< netdev event callback */
kernel_pid_t mac_pid; /**< the driver's thread's PID */
/* device driver specific fields */
uart_t uart; /**< UART interfaced used */
gpio_t reset_pin; /**< GPIO pin connected to RESET */
gpio_t sleep_pin; /**< GPIO pin connected to SLEEP */
gnrc_nettype_t proto; /**< protocol the interface speaks */
uint8_t options; /**< options field */
uint8_t addr_flags; /**< address flags as defined above */
uint8_t addr_short[2]; /**< onw 802.15.4 short address */
eui64_t addr_long; /**< own 802.15.4 long address */
/* general variables for the UART RX state machine */
xbee_rx_state_t int_state; /**< current state if the UART RX FSM */
uint16_t int_size; /**< temporary space for parsing the
* frame size */
/* values for the UART TX state machine */
mutex_t tx_lock; /**< mutex to allow only one
* transmission at a time */
uint8_t tx_buf[XBEE_MAX_PKT_LENGTH];/**< transmit data buffer */
/* buffer and synchronization for command responses */
mutex_t resp_lock; /**< mutex for waiting for AT command
* response frames */
uint8_t resp_buf[XBEE_MAX_RESP_LENGTH]; /**< AT response data buffer */
uint16_t resp_count; /**< counter for ongoing transmission */
uint16_t resp_limit; /**< size RESP frame in transferred */
/* buffer and synchronization for incoming network packets */
uint8_t rx_buf[XBEE_MAX_PKT_LENGTH];/**< receiving data buffer */
uint16_t rx_count; /**< counter for ongoing transmission */
uint16_t rx_limit; /**< size RX frame transferred */
} xbee_t;
/**
* @brief auto_init struct holding Xbee device initalization params
*/
typedef struct xbee_params {
uart_t uart; /**< UART interfaced the device is connected to */
uint32_t baudrate; /**< baudrate to use */
gpio_t sleep_pin; /**< GPIO pin that is connected to the SLEEP pin
set to GPIO_UNDEF if not used */
gpio_t reset_pin; /**< GPIO pin that is connected to the STATUS pin
set to GPIO_UNDEF if not used */
} xbee_params_t;
/**
* @brief Reference to the XBee driver interface
*/
extern const gnrc_netdev_driver_t xbee_driver;
/**
* @brief Initialize the given Xbee device
*
* @param[out] dev Xbee device to initialize
* @param[in] params parameters for device initialization
*
* @return 0 on success
* @return -ENODEV on invalid device descriptor
* @return -ENXIO on invalid UART or GPIO pins
*/
int xbee_init(xbee_t *dev, const xbee_params_t *params);
#ifdef __cplusplus
}
#endif
#endif /* XBEE_H_ */
/** @} */
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