mac_rx_pool.c

zigbee location examples

/*******************************************************************************************************
 *                                                                                                     *
 *        **********                                                                                   *
 *       ************                                                                                  *
 *      ***        ***                                                                                 *
 *      ***   +++   ***                                                                                *
 *      ***   + +   ***                                                                                *
 *      ***   +                         CHIPCON CC2430 INTEGRATED 802.15.4 MAC AND PHY                 *
 *      ***   + +   ***                                RX Packet Pool                                  *
 *      ***   +++   ***                                                                                *
 *      ***        ***                                                                                 *
 *       ************                                                                                  *
 *        **********                                                                                   *
 *                                                                                                     *
 *******************************************************************************************************
 * CONFIDENTIAL                                                                                        *
 * The use of this file is restricted by the signed MAC software license agreement.                    *
 *                                                                                                     *
 * Copyright Chipcon AS, 2005                                                                          *
 *******************************************************************************************************
 * This module contains the RX packet pool, which manages a table of MAC_RX_PACKET structures to be    *
 * used with the RX engine.                                                                            *
 *******************************************************************************************************/
#include <mac_headers.h>


//-------------------------------------------------------------------------------------------------------
// The RX packet pool
__no_init MAC_RX_PACKET pMrxPacketPool[MAC_OPT_RX_POOL_SIZE] @ "PM0_XDATA";
//-------------------------------------------------------------------------------------------------------




//-------------------------------------------------------------------------------------------------------
//  void mrxpInit(void)
//
//  DESCRIPTION:
//      Initializes the RX packet pool by clearing the "occupied" bits.
//-------------------------------------------------------------------------------------------------------
ROOT void mrxpInit(void) {
    memset(pMrxPacketPool, 0x00, sizeof(MAC_RX_PACKET) * MAC_OPT_RX_POOL_SIZE);
} // mrxpInit




//-------------------------------------------------------------------------------------------------------
//   mrxpReservePacket(MAC_RX_PACKET   **macRxPacket)
//
//  DESCRIPTION:
//      Reserves a packet from the RX packet pool.
//
//-------------------------------------------------------------------------------------------------------
ROOT MAC_RX_PACKET  * mrxpReservePacket(void) {
    MAC_RX_PACKET   *pPacket;
    UINT8 n;
    for (n = 0; n < MAC_OPT_RX_POOL_SIZE; n++) {
        pPacket = &pMrxPacketPool[n];
        DISABLE_GLOBAL_INT();
        if (!(pPacket->flags & MRXP_FLAG_PACKET_OCCUPIED_BM)) {
            pPacket->flags |= MRXP_FLAG_PACKET_OCCUPIED_BM;
            ENABLE_GLOBAL_INT();
            return pPacket;
        }
        ENABLE_GLOBAL_INT();
    }
    return NULL;
} // mrxpReservePacket




//-------------------------------------------------------------------------------------------------------
//  void mrxpReleasePacket(MAC_RX_PACKET* pPacket)
//
//  DESCRIPTION:
//      Releases a packet back to the RX packet pool.
//
//  ARGUMENTS:
//      MAC_RX_PACKET* pPacket
//          A pointer to the packet to be released. This parameter can be NULL.
//-------------------------------------------------------------------------------------------------------
ROOT void mrxpReleasePacket(MAC_RX_PACKET   *pPacket) {
    if (pPacket) pPacket->flags = 0x00;
} // mrxpReleasePacket