hplspim.nc

802.15.4协议的实现

// $Id: HPLSpiM.nc,v 1.6 2003/10/07 21:46:30 idgay Exp $

/*									tab:4
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 * two paragraphs and the author appear in all copies of this software.
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 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
 * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
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 *
 * Copyright (c) 2002-2003 Intel Corporation
 * All rights reserved.
 *
 * This file is distributed under the terms in the attached INTEL-LICENSE     
 * file. If you do not find these files, copies can be found by writing to
 * Intel Research Berkeley, 2150 Shattuck Avenue, Suite 1300, Berkeley, CA, 
 * 94704.  Attention:  Intel License Inquiry.
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/* 
 * Authors: Jaein Jeong, Philip buonadonna
 * Date last modified: $Revision: 1.6 $
 *
 */

/**
 * @author Jaein Jeong
 * @author Philip buonadonna
 */


module HPLSpiM
{
  provides interface SpiByteFifo;
  uses interface PowerManagement;
}
implementation
{
  norace uint8_t OutgoingByte; // Define norace to prevent nesC 1.1 warnings

  TOSH_SIGNAL(SIG_SPI) {
    register uint8_t temp = inp(SPDR);
    outp(OutgoingByte,SPDR);
    signal SpiByteFifo.dataReady(temp);
  }

  async command result_t SpiByteFifo.writeByte(uint8_t data) {
    //while(bit_is_clear(SPSR,SPIF));
    //outp(data, SPDR);
    atomic OutgoingByte = data;
    return SUCCESS;
  }

  async command result_t SpiByteFifo.isBufBusy() {
    return bit_is_clear(SPSR,SPIF);
  }

  async command uint8_t SpiByteFifo.readByte() {
    return inp(SPDR);
  }

  async command result_t SpiByteFifo.enableIntr() {
    //sbi(SPCR,SPIE);
    outp(0xC0, SPCR);
    cbi(DDRB, 0);
    call PowerManagement.adjustPower();
    return SUCCESS;
  }

  async command result_t SpiByteFifo.disableIntr() {
    cbi(SPCR, SPIE);
    sbi(DDRB, 0);
    cbi(PORTB, 0);
    call PowerManagement.adjustPower();
    return SUCCESS;
  }

  async command result_t SpiByteFifo.initSlave() {
    atomic {
      TOSH_MAKE_SPI_SCK_INPUT();
      TOSH_MAKE_MISO_INPUT();	// miso
      TOSH_MAKE_MOSI_INPUT();	// mosi
      cbi(SPCR, CPOL);		// Set proper polarity...
      cbi(SPCR, CPHA);		// ...and phase
      sbi(SPCR, SPIE);	// enable spi port
      sbi(SPCR, SPE);
    } 
    return SUCCESS;
  }
	
  async command result_t SpiByteFifo.txMode() {
    TOSH_MAKE_MISO_OUTPUT();
    TOSH_MAKE_MOSI_OUTPUT();
    return SUCCESS;
  }

  async command result_t SpiByteFifo.rxMode() {
    TOSH_MAKE_MISO_INPUT();
    TOSH_MAKE_MOSI_INPUT();
    return SUCCESS;
  }
}