VAR memory address

lardom

I recently viewed a thread that discussed writing to eeprom. I'm trying to learn to read a memory map.·My eyes widened·when I read that·a VAR or DAT·memory address in ram and eeprom·is the same. Can anyone tell me how to spot a·variable or a dat file in memory?

StefanL38

Hello lardom,

for retrieving the adress of variables you can use the "@"-operator and the "@@"-operatir. See Propeller-manual page 173

best regards

Stefan

Peter Jakacki

It's not about spotting one, if it is a variable then just update it to eeprom with the i2c.ewr(@variable,variable). I thought the example was self-explanatory. I will check the obex and make sure that the eewr is one of the methods I mentioned. Either way it is about writing a long to EEPROM to update it.

EDIT: moved edits to new message

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*Peter*

Post Edited (Peter Jakacki) : 3/21/2010 11:04:03 PM GMT

Peter Jakacki

Here are three objects that can be used with the EEPROM.

Mike Green - Basic_I2C_Driver
WriteLong(SCL, devSel, addrReg, data)
This driver has a writewait method rather than polling I2C address ack normally.

James Burrows - i2cobject
Add this method

pub eewr(addr,data)
  writeLocation(deviceadr,addr,data,16,4)

Where deviceadr normally equals $A0.
This driver does not poll the IC2 address ack to see if it's ready.

Kye - ROMEngine
writeLong(EEPROMaddress, value)
This driver correctly polls the IC2 address ack to see if it's ready and timeouts as well. This is probably the best out of three.


@Kye, The name is a bit of misnomer as EEPROM is Electrically Erasable, Programmable, and lastly Read Only Memory.
EEEngine might be more appropriate for a name and removing the repeated min/max/shift operators will improve read speed at least (just saw the "constant" operator)

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*Peter*

Post Edited (Peter Jakacki) : 3/22/2010 12:18:42 AM GMT

lardom

I hope I'm not losing it but this is·my third attempt to reply to this post. Stefan and Peter...Thanks for your help.