Hi David,
Firstly the buff in writeDone was for someother purpose which I did not use. It
could be ignored. (I would surely be in trouble later thinking why I wrote it.
:-) )
With respect to EEPROMWrite.write - The first parameter is the offset or as the
interface files quotes "@param line address of the line to be written".
Finally with the stack being cleared, that is a perfect analysis. I changed the
variable buff to static variable and of course now the stack doesnt get cleared.
Though this is not my application I will use the same analysis for my
application.
I tried the global variable as well. That works perfectly too.
Thanks a lot.
Regards,
Santosh.
> Hi Santosh,
>
> I was reading your email earlier, and one thing came to mind at first: If
> your code works on the mica2, then your code can't be broken. I'm also not
> sure that TOSSIM supports EEPROM? Maybe someone else could fill in those
> details for me?
>
> But... let's take a look at your code. I'll also be referring to a previous
> email you sent today.
>
> I think the main issue you're running into is stack vs. heap allocation for
> the "buff" variable, and how you're accessing it. You define uint8_t
> buff[255] as a local variable to Timer1.fired(). Then, you call
> EEPROMWrite.write(0, buff). This is a split-phase operation, so your
> Timer1.fired() event returns SUCCESS before the write (probably) proceeds
> and the buff[255] array gets cleared off the stack. Your memory is then
> corrupted on EEPROM because whatever you told it to write no longer exists.
>
> Then, in the EEPROMWrite.writeDone() event, you define a pointer called
> *buff, and don't initialize it - but then again, you don't use it either.
> Just be careful with leaving it in there because you might get confused when
> you look at the code a year from now.
>
> One more question I have: I'm not entirely familiar with the
> EEPROMWrite.write interface - what is the first argument? Is that the
> offset in EEPROM to write (and assume you're writing only one byte), or the
> length of data to write (and assume you're writing at a constant offset each
> time)?
>
>
> To solve all these issues, put buff[256] in global memory (below). The *buf
> pointer passed back as an argument in writeDone(..) should be equivalent of
> the &buff address. writeDone() is just telling you what you passed in.
>
> After the writeDone() event, it's then safe to call Read if you want to.
>
> Hope that helps,
> -David
>
>
> uint8_t buff[255];
>
> event result_t Timer1.fired()
> {
> memset(&buff, 11, sizeof(buff));
> if(call EEPROMWrite.write(0, &buff))
> dbg(DBG_USR1,"Write Successful %d\n",buff[0]);
> return SUCCESS;
> }
>
> event result_t EEPROMWrite.writeDone(uint8_t *buf)
> {
> if(call EEPROMWrite.endWrite() == FAIL)
> dbg(DBG_USR1,"End Write Failed\n");
>
> call Leds.yellowOn();
> dbg(DBG_USR1, "Write Done %d\n",buf[0]);
> if(buf[0] == 11)
>
> call Leds.greenOn();
> else
> call Leds.redOn();
> return SUCCESS;
> }
>
> event result_t EEPROMWrite.endWriteDone(result_t success)
> {
> return SUCCESS;
> }
>
> event result_t EEPROMRead.readDone(uint8_t *buf, result_t success)
> {
>
> return SUCCESS;
> }
>
>
>
> -----Original Message-----
> From: SANTOSH KUMAR [mailto:[EMAIL PROTECTED]
> Sent: Monday, March 26, 2007 2:50 PM
> To: [EMAIL PROTECTED]
> Subject: Question regardin EEPROM.
>
> Hi David,
>
> I hope you are doing great there.
>
> I am stuck with another memory/flash related issue. I am using the
> EEPROMWrite
> and EEPROMRead interface to write to the EEPROM. My code works on the mica2
> mote
> and doesnt work on TOSSIM. This is what I have done in my program
>
> event result_t Timer1.fired()
> {
> uint8_t buff[255];
> memset((void*)buff,11,1);
> if(call EEPROMWrite.write(0,buff))
> dbg(DBG_USR1,"Write Successful %d\n",buff[0]);
> return SUCCESS;
> }
>
> event result_t EEPROMWrite.writeDone(uint8_t *buf)
> {
> uint8_t *buff;
> if(call EEPROMWrite.endWrite() == FAIL)
> dbg(DBG_USR1,"End Write Failed\n");
>
> call Leds.yellowOn();
> dbg(DBG_USR1, "Write Done %d\n",buf[0]);
> if(buf[0] == 11)
>
> call Leds.greenOn();
> else
> call Leds.redOn();
> return SUCCESS;
> }
>
> event result_t EEPROMWrite.endWriteDone(result_t success)
> {
> return SUCCESS;
> }
>
> event result_t EEPROMRead.readDone(uint8_t *buf, result_t success)
> {
>
> return SUCCESS;
> }
>
> The place where I compare the buf[0] value to 11 fails in the TOSSIM.
> Basically
> the correct value is not getting written.
>
> Can you help me on this as I need to test my code and I am running it on
> tossim?
>
> Thanks in advance.
>
> Regards,
> Santosh.
>
>
>
>
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