?? extflashc.nc
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// $Id: ExtFlashC.nc,v 1.3 2009/09/07 13:56:58 r-studio Exp $
/*
*
*
* "Copyright (c) 2000-2005 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."
*
*/
/**
* @author Jonathan Hui <jwhui@cs.berkeley.edu>
*/
module ExtFlashC {
provides {
interface Init;
interface StdControl;
interface ExtFlash;
}
}
implementation {
uint32_t addr;
command error_t Init.init() {
TOSH_MAKE_FLASH_CS_OUTPUT();
TOSH_SET_FLASH_CS_PIN();
TOSH_MAKE_FLASH_CLK_OUTPUT();
TOSH_CLR_FLASH_CLK_PIN();
TOSH_MAKE_FLASH_OUT_OUTPUT();
TOSH_SET_FLASH_OUT_PIN();
TOSH_MAKE_FLASH_IN_INPUT();
TOSH_CLR_FLASH_IN_PIN();
return SUCCESS;
}
command error_t StdControl.start() { return SUCCESS; }
command error_t StdControl.stop() { return SUCCESS; }
uint8_t SPIByte(uint8_t out) {
uint8_t in = 0;
uint8_t i;
for ( i = 0; i < 8; i++, out <<= 1 ) {
// write bit
if (out & 0x80)
TOSH_SET_FLASH_OUT_PIN();
else
TOSH_CLR_FLASH_OUT_PIN();
// clock
TOSH_SET_FLASH_CLK_PIN();
// read bit
in <<= 1;
if (TOSH_READ_FLASH_IN_PIN())
in |= 1;
// clock
TOSH_CLR_FLASH_CLK_PIN();
}
return in;
}
command void ExtFlash.startRead(uint32_t newAddr) {
uint8_t cmdBuf[4];
uint8_t i;
addr = newAddr;
#if defined(PLATFORM_MULLE)
cmdBuf[0] = 0x68;
cmdBuf[1] = (addr >> 15);
cmdBuf[2] = ((addr >> 7) & 0xFC) + ((addr >> 8) & 0x1);
cmdBuf[3] = addr & 0xff;
#else
cmdBuf[0] = 0x68;
cmdBuf[1] = (addr >> 15) & 0xff;
cmdBuf[2] = (addr >> 7) & 0xfe;
cmdBuf[3] = addr & 0xff;
#endif
TOSH_CLR_FLASH_CLK_PIN();
TOSH_CLR_FLASH_CS_PIN();
for(i = 0; i < 4; i++)
SPIByte(cmdBuf[i]);
for(i = 0; i < 4; i++)
SPIByte(0x0);
TOSH_SET_FLASH_CLK_PIN();
TOSH_CLR_FLASH_CLK_PIN();
}
command uint8_t ExtFlash.readByte() {
#if defined(PLATFORM_MULLE)
if (!(addr & 0x1ff)) {
#else
if (!(addr & 0xff)) {
#endif
call ExtFlash.stopRead();
call ExtFlash.startRead(addr);
}
addr++;
return SPIByte(0);
}
command void ExtFlash.stopRead() {
TOSH_SET_FLASH_CS_PIN();
}
}
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