mac_tx_pool.c

来自「ucos在NEC平台下的移植」· C语言 代码 · 共 91 行

#include "includes.h"

//-------------------------------------------------------------------------------------------------------
// The TX packet pool
MAC_TX_PACKET pMtxPacketPool[MAC_OPT_TX_POOL_SIZE];
extern MAC_TX_INFO mtxInfo;
//-------------------------------------------------------------------------------------------------------




//-------------------------------------------------------------------------------------------------------
//  void mtxpInit(void)
//
//  DESCRIPTION:
//      Initializes the TX packet pool and the indirect packet queue
//-------------------------------------------------------------------------------------------------------
void mtxpInit(void) {
	UINT8 n = 0;
    for (n = 0; n < MAC_OPT_TX_POOL_SIZE; n++) {
        pMtxPacketPool[n].occupied = FALSE;
        pMtxPacketPool[n].poolIndex = n;
    }
} // mtxpInit




//-------------------------------------------------------------------------------------------------------
//  MAC_TX_PACKET* mtxpReservePacket(void)
//
//  DESCRIPTION:
//      Reserves a packet in the packet pool
//
//  RETURN VALUE:
//      MAC_TX_PACKET*
//          A pointer to the reserved packet, or NULL if the pool is empty
//-------------------------------------------------------------------------------------------------------
MAC_TX_PACKET* mtxpReservePacket(void) {
    MAC_TX_PACKET *pPacket;
	UINT8 n = 0;
    for (n = 0; n < MAC_OPT_TX_POOL_SIZE; n++) {
        pPacket = &pMtxPacketPool[n];
        if (!pPacket->occupied) {
            DISABLE_GLOBAL_INT();
            if (!pPacket->occupied) {
                pPacket->occupied = TRUE;
                ENABLE_GLOBAL_INT();
                return pPacket;
            }
            ENABLE_GLOBAL_INT();
        }
    }
    return NULL;
} // mtxpReservePacket




//-------------------------------------------------------------------------------------------------------
//  void mtxpReleasePacket(MAC_TX_PACKET* pPacket)
//
//  DESCRIPTION:
//      Releases a packet back to the TX packet pool
//
//  ARGUMENTS:
//      MAC_TX_PACKET* pPacket
//          A pointer to the packet to be released
//-------------------------------------------------------------------------------------------------------
void mtxpReleasePacket(MAC_TX_PACKET* pPacket) {
    if (mtxInfo.pPacket == pPacket) mtxInfo.pPacket = NULL;
    pPacket->occupied = FALSE;
} // mtxpReleasePacket




/*******************************************************************************************************
 * Revision history:
 *
 * $Log: mac_tx_pool.c,v $
 * Revision 1.6  2004/11/10 09:33:16  thl
 * Fixed a number of bugs according to: MAC software check lists.xls
 *
 * Revision 1.5  2004/08/13 13:04:48  jol
 * CC2420 MAC Release v0.7
 *
 *
 *******************************************************************************************************/