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91 lines
3.0 KiB
C
91 lines
3.0 KiB
C
//---------------------------------------------------------------------------
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// Copyright (C) 1999 Dallas Semiconductor Corporation, All Rights Reserved.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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// IN NO EVENT SHALL DALLAS SEMICONDUCTOR BE LIABLE FOR ANY CLAIM, DAMAGES
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// OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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// OTHER DEALINGS IN THE SOFTWARE.
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//
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// Except as contained in this notice, the name of Dallas Semiconductor
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// shall not be used except as stated in the Dallas Semiconductor
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// Branding Policy.
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//---------------------------------------------------------------------------
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//
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// todoses.C - Acquire and release a Session Todo for general 1-Wire Net
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// library
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//
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// Version: 2.00
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// 1.03 -> 2.00 Changed 'MLan' to 'ow'. Added support for
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// multiple ports.
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//
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#include "ownet.h"
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#include "sockit_owm.h"
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extern sockit_owm_state sockit_owm;
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// local function prototypes
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SMALLINT owAcquire(int, char *);
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void owRelease(int);
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//---------------------------------------------------------------------------
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// Attempt to acquire a 1-Wire net
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//
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// 'portnum' - number 0 to MAX_PORTNUM-1. This number is provided to
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// indicate the symbolic port number.
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// 'port_zstr' - zero terminated port name.
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//
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// Returns: TRUE - success, port opened
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//
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// The current implementation does not wait for a port to be freed,
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// it returns FALSE.
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//
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SMALLINT owAcquire(int portnum, char *port_zstr)
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{
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// check if there are enough ports available
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if (sockit_owm.own <= portnum) {
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// TODO some error message might be added
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return FALSE;
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}
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// check if port is already in use
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if ((sockit_owm.use >> portnum) & 0x1) {
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return FALSE;
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}
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// if it is unused take it
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else {
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sockit_owm.use |= (0x1 << portnum);
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return TRUE;
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}
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}
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//---------------------------------------------------------------------------
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// Release the previously acquired a 1-Wire net.
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//
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// 'portnum' - number 0 to MAX_PORTNUM-1. This number is provided to
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// indicate the symbolic port number.
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//
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void owRelease(int portnum)
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{
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// check if port is already in use and release it
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if ((sockit_owm.use >> portnum) & 0x1) {
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sockit_owm.use &= ~(0x1 << portnum);
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}
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// releasing an unused port is not supported
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else {
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// TODO some error message might be added
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}
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}
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