hplflashm.nc

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// $Id: HPLFlashM.nc,v 1.2 2005/07/21 07:00:15 jwhui Exp $

/*									tab:4
 *
 *
 * "Copyright (c) 2000-2004 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."
 *
 */

/**
 * HPLFlashM.nc - Driver for AT45DB041 flash on telos. 
 * 
 * This driver is intended to force as little change as possible to
 * the existing PageEEPROM implementation for Micas.
 *
 * @author Jonathan Hui <[e-mail]>
 */

module HPLFlashM {
  provides {
    interface StdControl as FlashControl;
    interface BusArbitration as FlashSelect;
    interface FastSPI as FlashSPI;
  }
  uses {
    interface HPLUSARTControl as USARTControl;
    interface BusArbitration;
  }
}

implementation {

  command result_t FlashControl.init() {
    TOSH_SET_FLASH_CS_PIN();
    TOSH_MAKE_FLASH_CS_OUTPUT();
    call USARTControl.setModeSPI();
    call USARTControl.disableRxIntr();
    call USARTControl.disableTxIntr();
    return SUCCESS;
  }

  command result_t FlashControl.start() {
    TOSH_SET_FLASH_CS_PIN();
    TOSH_MAKE_FLASH_CS_OUTPUT();
    call USARTControl.setModeSPI();
    call USARTControl.disableRxIntr();
    call USARTControl.disableTxIntr();
    return SUCCESS;
  }

  command result_t FlashControl.stop() {
    return SUCCESS;
  }

  async command result_t FlashSelect.getBus() {
    if (call BusArbitration.getBus() == FAIL)
      return FAIL;
    TOSH_CLR_FLASH_CS_PIN();
    return SUCCESS;
  }

  async command result_t FlashSelect.releaseBus() {
    TOSH_SET_FLASH_CS_PIN();
    return call BusArbitration.releaseBus();
  }

  event result_t BusArbitration.busFree() {
    return signal FlashSelect.busFree();
  }

  async command uint8_t FlashSPI.txByte(uint8_t spiOut) {
    call USARTControl.rx();
    call USARTControl.tx(spiOut);
    while( !call USARTControl.isRxIntrPending() );
    return call USARTControl.rx();
  }

  default event result_t FlashSelect.busFree() {
    return SUCCESS;
  }

}