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DelugeMetadataM.nc.bak
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DelugeMetadataM.nc.bak
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// $Id: DelugeMetadataM.nc,v 1.29 2005/09/01 22:01:33 jwhui Exp $
/* tab:2
*
*
* "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 <[email protected]>
*/
module DelugeMetadataM {
provides {
interface SplitControl;
interface DelugeMetadata as Metadata;
interface DelugeStats;
}
uses {
interface Crc;
interface DelugeMetadataStore as MetadataStore;
interface DelugeDataRead as DataRead;
interface DelugeDataWrite as DataWrite;
interface DelugeStorage;
interface FlashWP;
interface Leds;
interface Timer;
}
}
implementation {
DelugeImgDesc imgDesc[DELUGE_NUM_IMAGES];
uint8_t curImage;
uint8_t state;
uint16_t crc;
enum {
S_INIT,
S_SCAN_METADATA,
S_IDLE,
S_CLEAR_WP,
S_SETUP,
S_VERIFY,
S_SET_WP,
};
void verifyNextPage();
command result_t SplitControl.init() {
state = S_INIT;
return SUCCESS;
}
command result_t SplitControl.start() {
if ( state == S_INIT )
call Timer.start(TIMER_ONE_SHOT, 32);
return SUCCESS;
}
command result_t SplitControl.stop() {
return SUCCESS;
}
void signalDone() {
state = S_IDLE;
signal Metadata.updateDone(SUCCESS);
}
result_t execute() {
result_t result = FAIL;
switch(state) {
case S_INIT:
result = call DelugeStorage.loadImages();
break;
case S_SCAN_METADATA:
result = call MetadataStore.read(curImage, &imgDesc[curImage]);
break;
case S_CLEAR_WP:
result = call FlashWP.clrWP();
break;
case S_SETUP:
result = call DataWrite.erase(curImage);
break;
case S_VERIFY:
verifyNextPage();
result = SUCCESS;
break;
case S_SET_WP:
result = call FlashWP.setWP();
break;
}
if ( result == FAIL )
call Timer.start(TIMER_ONE_SHOT, 512);
return result;
}
event result_t Timer.fired() {
execute();
return SUCCESS;
}
event void DelugeStorage.loadImagesDone(result_t result) {
if (result == SUCCESS) {
curImage = 0;
state = S_SCAN_METADATA;
}
execute();
}
void scanNextImage() {
state = S_SCAN_METADATA;
curImage++;
if (curImage < DELUGE_NUM_IMAGES) {
execute();
}
else {
// all done, signal that metadata is ready
state = S_IDLE;
signal SplitControl.startDone();
}
}
void verifyNextPage() {
if ( call DataRead.verify(curImage, imgDesc[curImage].numPgsComplete) == FAIL)
call Timer.start(TIMER_ONE_SHOT, 512);
}
event void MetadataStore.readDone(storage_result_t result) {
if ( result != STORAGE_OK ) {
call Timer.start(TIMER_ONE_SHOT, 512);
return;
}
// check if metadata is corrupt
if ( !call Metadata.isImgDescValid(&imgDesc[curImage])
|| imgDesc[curImage].imgNum != curImage ) {
imgDesc[curImage].vNum = DELUGE_INVALID_VNUM;
imgDesc[curImage].imgNum = curImage;
imgDesc[curImage].numPgs = 0;
imgDesc[curImage].numPgsComplete = 0;
scanNextImage();
return;
}
verifyNextPage();
}
event void DataRead.verifyDone(storage_result_t result, bool isValid) {
if (result != STORAGE_OK) {
call Timer.start(TIMER_ONE_SHOT, 512);
return;
}
// SCAN state
if (state == S_SCAN_METADATA) {
if ( isValid ) {
imgDesc[curImage].numPgsComplete++;
if (imgDesc[curImage].numPgsComplete < imgDesc[curImage].numPgs) {
verifyNextPage();
return;
}
}
scanNextImage();
}
// VERIFY state
else {
if ( !isValid ) {
imgDesc[curImage].numPgsComplete = 0;
state = S_SETUP;
execute();
return;
}
if ( imgDesc[curImage].numPgsComplete + 1 >= imgDesc[curImage].numPgs ) {
if (call DataWrite.commit(curImage) == FAIL)
call Timer.start(TIMER_ONE_SHOT, 512);
return;
}
imgDesc[curImage].numPgsComplete++;
signalDone();
}
}
event void DataWrite.commitDone(storage_result_t result) {
if (result != STORAGE_OK) {
call Timer.start(TIMER_ONE_SHOT, 512);
return;
}
imgDesc[curImage].numPgsComplete = imgDesc[curImage].numPgs;
if (curImage == DELUGE_GOLDEN_IMAGE_NUM) {
state = S_SET_WP;
execute();
return;
}
signalDone();
}
command bool Metadata.isImgDescValid(DelugeImgDesc* tmpImgDesc) {
return ( tmpImgDesc->crc == call Crc.crc16(tmpImgDesc, 8)
&& tmpImgDesc->crc != 0
&& tmpImgDesc->imgNum < DELUGE_NUM_IMAGES );
}
command imgvnum_t DelugeStats.getVNum(imgnum_t imgNum) {
return imgDesc[imgNum].vNum;
}
command pgnum_t DelugeStats.getNumPgs(imgnum_t imgNum) {
return imgDesc[imgNum].numPgs;
}
command pgnum_t DelugeStats.getNumPgsComplete(imgnum_t imgNum) {
return imgDesc[imgNum].numPgsComplete;
}
command result_t Metadata.receivedPage(imgnum_t imgNum, pgnum_t pgNum) {
if ( state != S_IDLE || imgNum >= DELUGE_NUM_IMAGES )
return FAIL;
state = S_VERIFY;
curImage = imgNum;
if (pgNum+1 == imgDesc[imgNum].numPgs)
{
}
execute();
return SUCCESS;
}
command result_t Metadata.setupNewImage(DelugeImgDesc* newImgDesc) {
if (state != S_IDLE)
return FAIL;
curImage = newImgDesc->imgNum;
state = (curImage == DELUGE_GOLDEN_IMAGE_NUM) ? S_CLEAR_WP : S_SETUP;
memcpy(&(imgDesc[curImage]), newImgDesc, sizeof(DelugeImgDesc));
imgDesc[curImage].numPgsComplete = 0;
execute();
return SUCCESS;
}
command DelugeImgDesc* Metadata.getImgDesc(uint8_t imgNum) {
return &imgDesc[imgNum];
}
event void FlashWP.clrWPDone() {
state = S_SETUP;
execute();
}
event void FlashWP.setWPDone() {
signalDone();
}
event void DataWrite.eraseDone(storage_result_t result) {
if ( result != STORAGE_OK
|| call MetadataStore.write(curImage, &imgDesc[curImage]) == FAIL )
call Timer.start(TIMER_ONE_SHOT, 512);
}
event void MetadataStore.writeDone(storage_result_t result) {
signalDone();
}
event void DataRead.readDone(storage_result_t result) {}
event void DataWrite.writeDone(storage_result_t result) {}
default event void Metadata.updateDone(result_t result) {}
}