Point Me to "Clear EEPROM" program

LarryCardo · 2011-02-25 13:29

I understand there is a clear EEPROM program, but I can't find it.

Or maybe, just press F11 with a blank program??

Suggestions?

Larry Cardo
Mentor, OH

Ravenkallen · 2011-02-25 13:59

You can just use a program that has one public method with no code in it... Like

pub main

and then just press the F11 button...

LarryCardo · 2011-02-25 16:04

Thanks,

My hair is gray.

Bill Chennault · 2011-02-25 20:47

Ravenkallen--

I am brand new to the Prop. I have also wondered how to "clear" EEPROM. (A servo cranking up when all I wanted to do is blink an LED might be surprising!)

Thanks!

--Bill

Ravenkallen · 2011-02-25 20:56

No problem guys:)

Cluso99 · 2011-02-25 21:24

I am not sure that will clear the eeprom totally because the compiler sets the first few longs for the spin interpreter to run. However, if there is a binary around with all zeros or ones (not sure without checking if the eeprom cleared is 0 or 1), you could use proptool to just download and burn the binary. IIRC there is a checksum too so you may have to chek that out also.
Otherwise, maybe someone has a simple program to clear it. It is not difficult - look for a spin I2C eeprom object.

Ravenkallen · 2011-02-25 21:38

Well, Cluso is right. I proabably should have mentioned that. It will not completely clear the EEPROM, but it will prevent any other code from being run. You load a program into the RAM(Using a I2C driver) that will literally write a 0 to every EEPROM address location. You would also have to use a program like that if you wanted to erase a EEPROM larger than 32Kilobytes. But, If all you want is to stop a program from running, than the above mentioned procedure will work.

Mike Green · 2011-02-25 21:44

It would be a very unusual situation where you would need to actually clear an EEPROM. In addition, the erased state of an EEPROM is all one bits, not zeros. If the object of the exercise is to prevent the Prop from running anything that might set the I/O pins to something unexpected, then what's been suggested so far will work (download a minimal program that doesn't do anything).

Bobb Fwed · 2011-02-28 14:28

I know this thread is a couple days old, but in case someone is searching the forum for a solution, here is another.
Here is a method I use to erase the entire EEPROM: It uses the Basic or PASM I2C objects.

With the Basic I2C object, it takes 20 seconds or so to execute. Using the PASM I2C object, it is about five times faster.

PRI _errase | i, empty[16]
'' errase EEPROM memory

  longfill(@empty, -1, 16)

  REPEAT i FROM $0 TO $7FFF STEP 64
    write(i, @empty, 64)

PUB write (addr, valueAddr, size) | time
'' write page to EEPROM with watchdog  

  IF i2c.WritePage(BootPin, EEPROM, addr, valueAddr, size)
    RETURN false
  time := cnt
  repeat while i2c.WriteWait(BootPin, EEPROM, addr)                             ' wait for watchdog
    if cnt - time > clkfreq / 10
      RETURN false

  RETURN true

Point Me to "Clear EEPROM" program

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