/* ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010, 2011 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 . */ /** * @file mac.c * @brief MAC Driver code. * @note This function is implicitly invoked by @p halInit(), there is * no need to explicitly initialize the driver. * * @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. * * @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) { chSemInit(&macp->tdsem, 0); chSemInit(&macp->rdsem, 0); #if CH_USE_EVENTS chEvtInit(&macp->rdevent); #endif } /** * @brief MAC address setup. * @pre This function must be invoked with the driver in the stopped * state. If invoked on an active interface then it is ignored. * * @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 MAC * a system default is used. * * @api */ 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. * * @api */ 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->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) { 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; while (((msg = max_lld_get_receive_descriptor(macp, rdp)) != RDY_OK) && (time > 0)) { chSysLock(); systime_t 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) { 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) { return mac_lld_poll_link_status(macp); } #endif /* HAL_USE_MAC */ /** @} */