hpluartc.nc

用于传感器网络的节点操作系统 TinyOS 结构设计非常有意思

/*									tab:4
 *
 *
 * "Copyright (c) 2000-2002 The Regents of the University  of California.  
 * All rights reserved.
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose, without fee, and without written agreement is
 * hereby granted, provided that the above copyright notice, the following
 * two paragraphs and the author appear in all copies of this software.
 * 
 * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
 * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
 * CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
 * ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS."
 *
 */
/*									tab:4
 *  IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.  By
 *  downloading, copying, installing or using the software you agree to
 *  this license.  If you do not agree to this license, do not download,
 *  install, copy or use the software.
 *
 *  Intel Open Source License 
 *
 *  Copyright (c) 2002 Intel Corporation 
 *  All rights reserved. 
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are
 *  met:
 * 
 *	Redistributions of source code must retain the above copyright
 *  notice, this list of conditions and the following disclaimer.
 *	Redistributions in binary form must reproduce the above copyright
 *  notice, this list of conditions and the following disclaimer in the
 *  documentation and/or other materials provided with the distribution.
 *      Neither the name of the Intel Corporation nor the names of its
 *  contributors may be used to endorse or promote products derived from
 *  this software without specific prior written permission.
 *  
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 *  ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 *  PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE INTEL OR ITS
 *  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 *  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 *  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 *  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 * 
 */
/*
 *
 * Authors:		Jason Hill, David Gay, Philip Levis
 * Date last modified:  6/25/02
 *
 */

includes HPLConstants;

module HPLUARTC {
  provides interface HPLUART;
}

implementation {
  enum {
    IDLE = 0,
    BUSY = 1
  };

  void event_uart_write_create(event_t* uevent, int mote, long long utime);

  uint8_t compState;
  
  command result_t HPLUART.init() {
    compState = IDLE;
    return SUCCESS;
  }
  
  command result_t HPLUART.put(uint8_t data) {
    if (compState != IDLE) {return FAIL;}
    else {
      event_t* uevent = (event_t*)(malloc(sizeof(event_t)));
      event_uart_write_create(uevent, NODE_NUM, tos_state.tos_time + UART_BYTE_TIME);
      TOS_queue_insert_event(uevent);
      
      dbg(DBG_UART, "UART_write_Byte_inlet %x\n", data & 0xff);
      compState = BUSY;
    }
    return SUCCESS;
  }

  TOS_INTERRUPT_HANDLER(SIG_UART_TRANS,()) {
    compState = IDLE;
    signal HPLUART.putDone();
  }
  
  void event_uart_write_handle(event_t* uevent,
			       struct TOS_state* state) __attribute__ ((C, spontaneous)) {
    
    TOS_ISSUE_INTERRUPT(SIG_UART_TRANS)();
    uevent->cleanup(uevent);
    dbg(DBG_UART, "UART: Transmit byte complete.\n");
  }
  
  void event_uart_write_create(event_t* uevent, int mote, long long utime) {
    uevent->mote = mote;
    uevent->data = 0;
    uevent->time = utime;
    uevent->handle = event_uart_write_handle;
    uevent->cleanup = event_total_cleanup;
    uevent->pause = 0;
  }
}