mac_rx_pool.c

ucos在NEC平台下的移植

/*******************************************************************************************************
 *                                                                                                     *
 *        **********                                                                                   *
 *       ************                                                                                  *
 *      ***        ***                                                                                 *
 *      ***   +++   ***                                                                                *
 *      ***   + +   ***                                                                                *
 *      ***   +                         CHIPCON CC2420 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, 2004                                                                          *
 *******************************************************************************************************
 * This module contains the RX packet pool, which manages a table of MAC_RX_PACKET structures to be    *
 * used with the RX engine.                                                                            *
 *******************************************************************************************************
 * Compiler: AVR-GCC                                                                                   *
 * Target platform: CC2420DB, CC2420 + any ATMEGA MCU                                                  *
 *******************************************************************************************************
 * The revision history is located at the bottom of this file                                          *
 *******************************************************************************************************/
#pragma SFR
#pragma NOP
#pragma STOP
#pragma HALT
#pragma DI
#pragma EI
#pragma  section @@DATA rxpool at 0xE500///
#include "mac_headers.h"


//-------------------------------------------------------------------------------------------------------
// The RX packet pool
MAC_RX_PACKET pMrxPacketPool[MAC_OPT_RX_POOL_SIZE];
//-------------------------------------------------------------------------------------------------------




//-------------------------------------------------------------------------------------------------------
//  void mrxpInit(void)
//
//  DESCRIPTION:
//      Initializes the RX packet pool by clearing the "occupied" bits.
//-------------------------------------------------------------------------------------------------------
void mrxpInit(void) {
    UINT8 n;
    for (n = 0; n < MAC_OPT_RX_POOL_SIZE; n++) {
        pMrxPacketPool[n].flags = 0x00;
    }
} // mrxpInit




//-------------------------------------------------------------------------------------------------------
//  MAC_RX_PACKET* mrxpReservePacket(void)
//
//  DESCRIPTION:
//      Reserves a packet from the RX packet pool.
//
//  RETURN VALUE:
//      MAC_RX_PACKET*
//          NULL if the reservation failed, otherwise a pointer to the reserved packet.
//-------------------------------------------------------------------------------------------------------
MAC_RX_PACKET* mrxpReservePacket(void) {
    MAC_RX_PACKET *pPacket;
	UINT8 n = 0;///
    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.
//-------------------------------------------------------------------------------------------------------
void mrxpReleasePacket(MAC_RX_PACKET* pPacket) {
    pPacket->flags = 0x00;

    
} // mrxpReleasePacket




/*******************************************************************************************************
 * Revision history:
 *
 * $Log: mac_rx_pool.c,v $
 * Revision 1.7  2005/02/02 15:08:16  thl
 * Added functionality for pan id conflict according to IEEE802.15.4-2003
 *
 * Revision 1.6  2004/11/10 09:33:14  thl
 * Fixed a number of bugs according to: MAC software check lists.xls
 *
 * Revision 1.5  2004/08/13 13:04:47  jol
 * CC2420 MAC Release v0.7
 *
 *
 *******************************************************************************************************/