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/*
ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT 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.
ChibiOS/RT 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, see <http://www.gnu.org/licenses/>.
*/
/**
* @file mac.c
* @brief MAC Driver code.
* @addtogroup MAC
* @{
*/
#include "ch.h"
#include "hal.h"
#if CH_HAL_USE_MAC
/**
* @brief MAC Driver initialization.
*/
void macInit(void) {
mac_lld_init();
}
/**
* @brief Initialize the standard part of a @p MACDriver structure.
*
* @param[in] macp pointer to the @p MACDriver object
*/
void macObjectInit(MACDriver *macp) {
chSemInit(&macp->md_tdsem, 0);
chSemInit(&macp->md_rdsem, 0);
#if CH_USE_EVENTS
chEvtInit(&macp->md_rdevent);
#endif
}
/**
* @brief MAC address setup.
*
* @param[in] macp pointer to the @p MACDriver object
* @param[in] p pointer to a six bytes buffer containing the MAC address. If
* this parameter is set to @p NULL then a system default MAC is
* used.
*
* @note This function must be invoked only with the driver in the stopped
* state. If invoked on an active interface then it is ignored.
*/
void macSetAddress(MACDriver *macp, const uint8_t *p) {
mac_lld_set_address(macp, p);
}
/**
* @brief Allocates a transmission descriptor.
* @details One of the available transmission descriptors is locked and
* returned. If a descriptor is not currently available then the
* invoking thread is queued until one is freed.
*
* @param[in] macp pointer to the @p MACDriver object
* @param[out] tdp pointer to a @p MACTransmitDescriptor structure
* @param[in] time the number of ticks before the operation timeouts,
* the following special values are allowed:
* - @a TIME_IMMEDIATE immediate timeout.
* - @a TIME_INFINITE no timeout.
* .
* @return The operation status.
* @retval RDY_OK the descriptor was obtained.
* @retval RDY_TIMEOUT the operation timed out, descriptor not initialized.
*/
msg_t macWaitTransmitDescriptor(MACDriver *macp,
MACTransmitDescriptor *tdp,
systime_t time) {
msg_t msg;
while (((msg = max_lld_get_transmit_descriptor(macp, tdp)) != RDY_OK) &&
(time > 0)) {
chSysLock();
systime_t now = chTimeNow();
if ((msg = chSemWaitTimeoutS(&macp->md_tdsem, time)) == RDY_TIMEOUT)
break;
if (time != TIME_INFINITE)
time -= (chTimeNow() - now);
chSysUnlock();
}
return msg;
}
/**
* @brief Releases a transmit descriptor and starts the transmission of the
* enqueued data as a single frame.
*
* @param[in] tdp the pointer to the @p MACTransmitDescriptor structure
*/
void macReleaseTransmitDescriptor(MACTransmitDescriptor *tdp) {
mac_lld_release_transmit_descriptor(tdp);
}
/**
* @brief Waits for a received frame.
* @details Stops until a frame is received and buffered. If a frame is
* not immediately available then the invoking thread is queued
* until one is received.
*
* @param[in] macp pointer to the @p MACDriver object
* @param[out] rdp pointer to a @p MACReceiveDescriptor structure
* @param[in] time the number of ticks before the operation timeouts,
* the following special values are allowed:
* - @a TIME_IMMEDIATE immediate timeout.
* - @a TIME_INFINITE no timeout.
* .
* @return The operation status.
* @retval RDY_OK the descriptor was obtained.
* @retval RDY_TIMEOUT the operation timed out, descriptor not initialized.
*/
msg_t macWaitReceiveDescriptor(MACDriver *macp,
MACReceiveDescriptor *rdp,
systime_t time) {
msg_t msg;
while (((msg = max_lld_get_receive_descriptor(macp, rdp)) != RDY_OK) &&
(time > 0)) {
chSysLock();
systime_t now = chTimeNow();
if ((msg = chSemWaitTimeoutS(&macp->md_rdsem, time)) == RDY_TIMEOUT)
break;
if (time != TIME_INFINITE)
time -= (chTimeNow() - now);
chSysUnlock();
}
return msg;
}
/**
* @brief Releases a receive descriptor.
* @details The descriptor and its buffer are made available for more incoming
* frames.
*
* @param[in] rdp the pointer to the @p MACReceiveDescriptor structure
*/
void macReleaseReceiveDescriptor(MACReceiveDescriptor *rdp) {
mac_lld_release_receive_descriptor(rdp);
}
/**
* @brief Updates and returns the link status.
*
* @param[in] macp pointer to the @p MACDriver object
* @return The link status.
* @retval TRUE if the link is active.
* @retval FALSE if the link is down.
*/
bool_t macPollLinkStatus(MACDriver *macp) {
return mac_lld_poll_link_status(macp);
}
#endif /* CH_HAL_USE_MAC */
/** @} */
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