HPLFlash.nc
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- // $Id: HPLFlash.nc,v 1.1.1.1 2005/04/22 04:26:45 acwarrie Exp $
- /* tab:4
- * "Copyright (c) 2000-2003 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."
- *
- * 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.
- */
- /*
- *
- * Authors: Jason Hill, David Gay, Philip Levis
- * Date last modified: 6/25/02
- *
- */
- /**
- * Low level hardware access to the onboard EEPROM (well, Flash actually)
- * @author Jason Hill
- * @author David Gay
- * @author Philip Levis
- */
- module HPLFlash {
- provides {
- interface StdControl as FlashControl;
- interface FastSPI as FlashSPI;
- interface SlavePin as FlashSelect;
- interface Resource as FlashIdle;
- command bool getCompareStatus();
- }
- }
- implementation
- {
- // We use SPI mode 0 (clock low at select time)
- command result_t FlashControl.init() {
- TOSH_MAKE_FLASH_SELECT_OUTPUT();
- TOSH_SET_FLASH_SELECT_PIN();
- TOSH_CLR_FLASH_CLK_PIN();
- TOSH_MAKE_FLASH_CLK_OUTPUT();
- TOSH_SET_FLASH_OUT_PIN();
- TOSH_MAKE_FLASH_OUT_OUTPUT();
- TOSH_CLR_FLASH_IN_PIN();
- TOSH_MAKE_FLASH_IN_INPUT();
- cbi(EIMSK, 2); // disable flash in interrupt
- EICRA |= 0x30; // make flash in a rising-edge interrupt
- return SUCCESS;
- }
- command result_t FlashControl.start() {
- return SUCCESS;
- }
- command result_t FlashControl.stop() {
- return SUCCESS;
- }
- // The flash select is not shared on mica2, mica2dot
- async command result_t FlashSelect.low() {
- TOSH_CLR_FLASH_CLK_PIN(); // ensure SPI mode 0
- TOSH_CLR_FLASH_SELECT_PIN();
- return SUCCESS;
- }
- task void sigHigh() {
- signal FlashSelect.notifyHigh();
- }
- async command result_t FlashSelect.high(bool needEvent) {
- TOSH_SET_FLASH_SELECT_PIN();
- if (needEvent)
- post sigHigh();
- return SUCCESS;
- }
-
- #define BITINIT
- uint8_t clrClkAndData = inp(PORTD) & ~0x28
- #define BIT(n)
- outp(clrClkAndData, PORTD);
- asm __volatile__
- ( "sbrc %2," #n "n"
- "tsbi 18,3n"
- "tsbi 18,5n"
- "tsbic 16,2n"
- "tori %0,1<<" #n "n"
- : "=d" (spiIn) : "0" (spiIn), "r" (spiOut))
- async command uint8_t FlashSPI.txByte(uint8_t spiOut) {
- uint8_t spiIn = 0;
- // This atomic ensures integrity at the hardware level...
- atomic
- {
- BITINIT;
- BIT(7);
- BIT(6);
- BIT(5);
- BIT(4);
- BIT(3);
- BIT(2);
- BIT(1);
- BIT(0);
- }
- return spiIn;
- }
- /**
- * Check FLASH status byte.
- * @return TRUE if the flash is ready, FALSE if not.
- * In the TRUE case, the full status byte may not have been
- * read out of the flash, in the FALSE case it is fully read out.
- */
- task void avail() {
- signal FlashIdle.available();
- }
- command result_t FlashIdle.wait() {
- result_t waits;
- // Setup interrupt on rising edge of flash in
- atomic
- {
- EIFR = 1 << 2; // clear any pending interrupt
- sbi(EIMSK, 2); // enable interrupt
- TOSH_CLR_FLASH_CLK_PIN();
- // We need to wait at least 2 cycles here (because of the signal
- // acquisition delay). It's also good to wait a few microseconds
- // to get the fast ("FAIL") exit from wait (reads are twice as fast
- // with a 2us delay...)
- TOSH_uwait(2);
- if (TOSH_READ_FLASH_IN_PIN())
- {
- // already high
- cbi(EIMSK, 2);
- waits = FAIL;
- }
- else
- waits = SUCCESS;
- }
- return waits;
- }
- TOSH_SIGNAL(SIG_INTERRUPT2) {
- cbi(EIMSK, 2); // disable interrupt
- post avail();
- }
- command bool getCompareStatus() {
- TOSH_SET_FLASH_CLK_PIN();
- TOSH_CLR_FLASH_CLK_PIN();
- // Wait for compare value to propagate
- asm volatile("nop");
- asm volatile("nop");
- return !TOSH_READ_FLASH_IN_PIN();
- }
- default event result_t FlashIdle.available() {
- return SUCCESS;
- }
- }