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LibrePilot/flight/pios/common/pios_rfm22b_com.c

144 lines
4.9 KiB
C

/**
******************************************************************************
* @addtogroup PIOS PIOS Core hardware abstraction layer
* @{
* @addtogroup PIOS_RFM22B Radio Functions
* @brief PIOS COM interface for for the RFM22B radio
* @{
*
* @file pios_rfm22b_com.c
* @author The OpenPilot Team, http://www.openpilot.org Copyright (C) 2012.
* @brief Implements a driver the the RFM22B driver
* @see The GNU Public License (GPL) Version 3
*
*****************************************************************************/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <pios.h>
#ifdef PIOS_INCLUDE_RFM22B_COM
#include <pios_rfm22b_priv.h>
/* Provide a COM driver */
static void PIOS_RFM22B_COM_ChangeBaud(uint32_t rfm22b_id, uint32_t baud);
static void PIOS_RFM22B_COM_RegisterRxCallback(uint32_t rfm22b_id, pios_com_callback rx_in_cb, uint32_t context);
static void PIOS_RFM22B_COM_RegisterTxCallback(uint32_t rfm22b_id, pios_com_callback tx_out_cb, uint32_t context);
static void PIOS_RFM22B_COM_TxStart(uint32_t rfm22b_id, uint16_t tx_bytes_avail);
static void PIOS_RFM22B_COM_RxStart(uint32_t rfm22b_id, uint16_t rx_bytes_avail);
static uint32_t PIOS_RFM22B_COM_Available(uint32_t rfm22b_com_id);
/* Local variables */
const struct pios_com_driver pios_rfm22b_com_driver = {
.set_baud = PIOS_RFM22B_COM_ChangeBaud,
.tx_start = PIOS_RFM22B_COM_TxStart,
.rx_start = PIOS_RFM22B_COM_RxStart,
.bind_tx_cb = PIOS_RFM22B_COM_RegisterTxCallback,
.bind_rx_cb = PIOS_RFM22B_COM_RegisterRxCallback,
.available = PIOS_RFM22B_COM_Available
};
/**
* Changes the baud rate of the RFM22B peripheral without re-initialising.
*
* @param[in] rfm22b_id The defice ID
* @param[in] baud Requested baud rate
*/
static void PIOS_RFM22B_COM_ChangeBaud(__attribute__((unused)) uint32_t rfm22b_id,
__attribute__((unused)) uint32_t baud)
{}
/**
* Start a receive from the COM device
*
* @param[in] rfm22b_dev The device ID.
* @param[in] rx_bytes_available The number of bytes available to receive
*/
static void PIOS_RFM22B_COM_RxStart(__attribute__((unused)) uint32_t rfm22b_id,
__attribute__((unused)) uint16_t rx_bytes_avail)
{}
/**
* Start a transmit from the COM device
*
* @param[in] rfm22b_dev The device ID.
* @param[in] tx_bytes_available The number of bytes available to transmit
*/
static void PIOS_RFM22B_COM_TxStart(__attribute__((unused)) uint32_t rfm22b_id,
__attribute__((unused)) uint16_t tx_bytes_avail)
{}
/**
* Register the callback to pass received data to
*
* @param[in] rfm22b_dev The device ID.
* @param[in] rx_in_cb The Rx callback function.
* @param[in] context The callback context.
*/
static void PIOS_RFM22B_COM_RegisterRxCallback(uint32_t rfm22b_id, pios_com_callback rx_in_cb, uint32_t context)
{
struct pios_rfm22b_dev *rfm22b_dev = (struct pios_rfm22b_dev *)rfm22b_id;
if (!PIOS_RFM22B_Validate(rfm22b_dev)) {
return;
}
/*
* Order is important in these assignments since ISR uses _cb
* field to determine if it's ok to dereference _cb and _context
*/
rfm22b_dev->rx_in_context = context;
rfm22b_dev->rx_in_cb = rx_in_cb;
}
/**
* Register the callback to get data from.
*
* @param[in] rfm22b_dev The device ID.
* @param[in] rx_in_cb The Tx callback function.
* @param[in] context The callback context.
*/
static void PIOS_RFM22B_COM_RegisterTxCallback(uint32_t rfm22b_id, pios_com_callback tx_out_cb, uint32_t context)
{
struct pios_rfm22b_dev *rfm22b_dev = (struct pios_rfm22b_dev *)rfm22b_id;
if (!PIOS_RFM22B_Validate(rfm22b_dev)) {
return;
}
/*
* Order is important in these assignments since ISR uses _cb
* field to determine if it's ok to dereference _cb and _context
*/
rfm22b_dev->tx_out_context = context;
rfm22b_dev->tx_out_cb = tx_out_cb;
}
/**
* See if the COM port is alive
*
* @param[in] rfm22b_dev The device ID.
* @return True of the device is available.
*/
static uint32_t PIOS_RFM22B_COM_Available(uint32_t rfm22b_id)
{
return PIOS_RFM22B_LinkStatus(rfm22b_id) ? COM_AVAILABLE_RXTX : COM_AVAILABLE_NONE;
}
#endif /* PIOS_INCLUDE_RFM22B_COM */