How to read write EEPROM on 12C671?

[financecatalyst]

Hello, I am having errors while compiling my code for reading and writing on EEPROM with my 12C671.
I tried using read, write, I2CREAD etc but there are errors always.
Can someone please guide me as to what I could do?
Thanks

[Acetronics2]

Hi,

You can find on firsts pages of the manual, $ MCU Specific issues : " ... those chips have I2C interfaced EEPROMS so, you have to use I2CRead and I2CWrite ... "

you'll find further infos either in the Pic Datasheet and in respective commands pages of PBP Manual.

Alain

PS: Will you show some code ???

[financecatalyst]

I did tried to do as per the manual, but seems to be missing something:
This is what I did:

DEFINE I2C_INTERNAL 1
EEPROM 0,[0,0,0,0] 
read 0,gpio.0
read 1,gpio.1
read 2,gpio.4
read 4,gpio.5

Also tried the above 4 statements using 12CREAD but :(

Can you please add one example to read and one to write?
I went through the manual but it does not have an example on how to write statements for INTERNAL EEPROM.

[Acetronics2]

Can you please add one example to read and one to write?
I went through the manual but it does not have an example on how to write statements for INTERNAL EEPROM.

Straight from the SAMPLES folder of your compiler ...

' I2CREAD and I2WRITE Commands
'
' Write to the first 16 locations of internal I2C EEPROM
' Read first 16 locations back and send to serial out repeatedly
' Note: for PIC12CE67x MCU's

        Include "modedefs.bas"          ' Include serial modes

Define  I2C_INTERNAL  1

ADCON1 = 7				' Set ADC pins to digital operation

SO      con     1                       ' Define serial output pin
DPIN    var     GPIO.6                 	' Data line to internal EEPROM
CPIN    var     GPIO.7                 	' Clock line to internal EEPROM
B0      var     byte
B1      var     byte
B2      var     byte

        For B0 = 0 To 15                ' Loop 16 times
                I2CWRITE DPIN,CPIN,$A0,B0,[B0]  ' Write each location's address to itself
                Pause 10                ' Delay 10ms after each write
        Next B0

mainloop: For B0 = 0 To 15 step 2       ' Loop 8 times
                I2CREAD DPIN,CPIN,$A0,B0,[B1,B2]        ' Read 2 locations in a row
                Serout SO,N2400,[#B1," ",#B2," "]       ' Print 2 locations
        Next B0

        Serout SO,N2400,[10]            ' Print linefeed

        Goto mainloop

also available @ Melabs site in the support section ...

Alain

[financecatalyst]

Perfect, thank you so much. Hopefully it should solve my problem.

Will this read write operation be affected by DT-Interrupts in any way as they are also running in my code?

Thanks again

[Acetronics2]

my point of view is to disable interrupts before writing to EEPROM and re-enable after.

For DT Ints ... I do not remember exactly if there's a trick to do that automatically ... I think yes ( something like "DEFINE EEPROM_USED 1" ... may be ), but you'd much better verify on the relevant thread.

Alain