Clearing EEPROM

Kurt Finnie

I'm new and I can't figure out how to clear the EEPROM.

I mistakenly pressed F11 and loaded a small program into EEPROM and it worked just fine, but now I want to work on my program.
I've tried powering down, removing the USB cable, reinstalling all, etc. etc. The program just starts up again from the EEPROM.

I know this is a no-brainer but I've spent way too much time and not figured it out.

Kurt Finnie

Pavel

You do not need to clear EEPROM, you just upload the new version of your program there, overwriting the old version. Even though the program starts executing when you power the chip, the programming connection will reset the chip to upload the new code.

In other words, just hit F11 again and new code will go into EEPROM.

Searider

You can also press F10 and what ever program you have up will load into RAM and execute. When you reset it will go back to runing the program that was last loaded into ROM.

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Searider

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Iamretired

I want to also clear EEPROM. I don't want to do anything else. What can I do to clear a program out of EEPROM?

John

RonP

You could just write a Do Nothing program if that will work for you.

PUB DoNothing

Upload to EEPROM F11. Upon boot up the Propeller will Do Nothing.

Ron

Bobb Fwed

Or programmatically:

' using Basic I2C Driver or PASM I2C Driver
PRI _errase | i, empty[16]
'' errase EEPROM memory

  longfill(@empty, 0, 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

Probably not as efficient as it could be, but it's the way I've do it on a non-time sensitive system.