mac.c
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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012 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/>.
---
A special exception to the GPL can be applied should you wish to distribute
a combined work that includes ChibiOS/RT, without being obliged to provide
the source code for any proprietary components. See the file exception.txt
for full details of how and when the exception can be applied.
*/
/**
* @file mac.c
* @brief MAC Driver code.
*
* @addtogroup MAC
* @{
*/
#include "ch.h"
#include "hal.h"
#if HAL_USE_MAC || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local variables. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief MAC Driver initialization.
* @note This function is implicitly invoked by @p halInit(), there is
* no need to explicitly initialize the driver.
*
* @init
*/
void macInit(void) {
mac_lld_init();
}
/**
* @brief Initialize the standard part of a @p MACDriver structure.
*
* @param[out] macp pointer to the @p MACDriver object
*
* @init
*/
void macObjectInit(MACDriver *macp) {
macp->state = MAC_STOP;
macp->config = NULL;
chSemInit(&macp->tdsem, 0);
chSemInit(&macp->rdsem, 0);
#if MAC_USE_EVENTS
chEvtInit(&macp->rdevent);
#endif
}
/**
* @brief Configures and activates the MAC peripheral.
*
* @param[in] macp pointer to the @p MACDriver object
* @param[in] config pointer to the @p MACConfig object
*
* @api
*/
void macStart(MACDriver *macp, const MACConfig *config) {
chDbgCheck((macp != NULL) && (config != NULL), "macStart");
chSysLock();
chDbgAssert(macp->state == MAC_STOP,
"macStart(), #1", "invalid state");
macp->config = config;
mac_lld_start(macp);
macp->state = MAC_ACTIVE;
chSysUnlock();
}
/**
* @brief Deactivates the MAC peripheral.
*
* @param[in] macp pointer to the @p MACDriver object
*
* @api
*/
void macStop(MACDriver *macp) {
chDbgCheck(macp != NULL, "macStop");
chSysLock();
chDbgAssert((macp->state == MAC_STOP) || (macp->state == MAC_ACTIVE),
"macStop(), #1", "invalid state");
mac_lld_stop(macp);
macp->state = MAC_STOP;
chSysUnlock();
}
/**
* @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.
*
* @api
*/
msg_t macWaitTransmitDescriptor(MACDriver *macp,
MACTransmitDescriptor *tdp,
systime_t time) {
msg_t msg;
systime_t now;
chDbgCheck((macp != NULL) && (tdp != NULL), "macWaitTransmitDescriptor");
chDbgAssert(macp->state == MAC_ACTIVE, "macWaitTransmitDescriptor(), #1",
"not active");
while (((msg = mac_lld_get_transmit_descriptor(macp, tdp)) != RDY_OK) &&
(time > 0)) {
chSysLock();
now = chTimeNow();
if ((msg = chSemWaitTimeoutS(&macp->tdsem, time)) == RDY_TIMEOUT) {
chSysUnlock();
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
*
* @api
*/
void macReleaseTransmitDescriptor(MACTransmitDescriptor *tdp) {
chDbgCheck((tdp != NULL), "macReleaseTransmitDescriptor");
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.
*
* @api
*/
msg_t macWaitReceiveDescriptor(MACDriver *macp,
MACReceiveDescriptor *rdp,
systime_t time) {
msg_t msg;
systime_t now;
chDbgCheck((macp != NULL) && (rdp != NULL), "macWaitReceiveDescriptor");
chDbgAssert(macp->state == MAC_ACTIVE, "macWaitReceiveDescriptor(), #1",
"not active");
while (((msg = mac_lld_get_receive_descriptor(macp, rdp)) != RDY_OK) &&
(time > 0)) {
chSysLock();
now = chTimeNow();
if ((msg = chSemWaitTimeoutS(&macp->rdsem, time)) == RDY_TIMEOUT) {
chSysUnlock();
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
*
* @api
*/
void macReleaseReceiveDescriptor(MACReceiveDescriptor *rdp) {
chDbgCheck((rdp != NULL), "macReleaseReceiveDescriptor");
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.
*
* @api
*/
bool_t macPollLinkStatus(MACDriver *macp) {
chDbgCheck((macp != NULL), "macPollLinkStatus");
chDbgAssert(macp->state == MAC_ACTIVE, "macPollLinkStatus(), #1",
"not active");
return mac_lld_poll_link_status(macp);
}
#endif /* HAL_USE_MAC */
/** @} */