Using external EEprom - need a little guidance

[Scampy]

Guys, having a blonde moment here....

I want to save data to an external chip, a 24c256 EEPROM, but I can't seem to make it work the way I currently save data to the flash in the PIC.

Using a DS1307 RTC as an example I2CWrite SDApin,SCLpin,$D0,$00,[RTCSec,RTCMin,RTCHour,RTCWDay,RTCDay,RTCMonth,RTCY ear,RTCCtrl] works fine as each time the update is made it writes the complete string of variables so they remain in the correct order when read back. However I have used designated memory locations eg

WRITE  $50,lightsetHR[0],lightsetMN[0],lightoffHR[0],lightoffMN[1],word droptemp[0] ,word normtemp[0],StartMin[0],StopHour[0],StopMin[0],word alarmhigh[0],StartHour[0],word alarmlow[0] 
write  $60,lightsetHR[1],lightsetMN[1],lightoffHR[1],lightoffMN[1],word droptemp[1] ,word normtemp[1],StartMin[1],StopHour[1],StopMin[1],word alarmhigh[1],StartHour[1],word alarmlow[1]

How would I impliment this so it uses the 24c256, do I use the second hex address in the I2CWrite SDApin,SCLpin,$D0,$00, statement thus:

I2CWrite SDApin,SCLpin,$A0,$50 [lightsetHR[0],lightsetMN[0],lightoffHR[0],lightoffMN[1],word droptemp[0] etc etc...]
I2CWrite SDApin,SCLpin,$A0,$60 [lightsetHR[1],lightsetMN[1], etc etc...... ]

[Scampy]

When I use

I2CWrite SDApin,SCLpin,$A0,$00,[lightsetHR[0],lightsetMN[0],lightoffHR[0],lightoffMN[1],word droptemp[0] ,word normtemp[0],StartMin[0],StopHour[0],StopMin[0],word alarmhigh[0],StartHour[0],word alarmlow[0]]

It haults with a "bad expression" error when i attempt to compile, with lots of expected [ and ] !! - but all I've added are the [ and ] at the end of the variable string

[Tabsoft]

Scampy,

A couple of things for I2CWrite for sEEPROMs.

1. For the Address, per the manual do not use Constants. Use a variable of the size required by the EEPROM. A 24c256 requires a Word address.
2. When using arrays in I2C you need to use var(0) versus var[0]. This is what is causing all of your compile errors.
3. You are writing all of these values in a string to the sEEPROM, known as Page Write mode. Make sure that the total BYTES sent to the sEEPROM at one time
does not exceed its page write buffer. For the 24c256 it is 64 bytes.
4. Remember the sEEPROMS deal with data on a Byte basis. So for your example if I remember correctly your variables you are writing are WORD variables.
So make sure you x2 when counting the number of BYTES sent to the sEEPROM in Page Write mode.

This should get you going.

i2Addr var word

i2Addr = $00
i2cwrite SDA, SCL, $A0, i2Addr, [lightsetHR(0),lightsetMN(0),lightoffHR(0),lightoffMN(0),droptemp(0),normtemp(0), _
StartMin(0),StopHour(0),StopMin(0),alarmhigh(0),StartHour(0),alarmlow(0)]

This will be 24 bytes. Remember the 24c256 is arranged/addressed in rows of 16 bytes. So this data will start at addr $00 and end at addr $17. (0-23).
The start addr of your next record would be $18.

[Scampy]

Thanks for the guidance.

In replacing the square brackets with round ones, would I also need to change the numeric value too to reflect the array format

normtemp          VAR WORD[4]                   ' used to store the desired temperature setting
  normtemp1       VAR normtemp[0]
  normtemp2       VAR normtemp[1]
  normtemp3       VAR normtemp[2]
  normtemp4       VAR normtemp[3]

So that normtemp[0] becomes normtemp(1)

[Scampy]

I still get the bad expression errors with the following

i2cread SDA, SCL, $A0, $00,[lightsetHR(1),lightsetMN(1),lightoffHR(1),lightoffMN(1),word droptemp(1) ,word normtemp(1),StartMin(1),StopHour(1),StopMin(1),word alarmhigh(1),StartHour(1),word alarmlow(1)]  
i2cread SDA, SCL, $A0, $18,[lightsetHR(2),lightsetMN(2),lightoffHR(2),lightoffMN(2),word droptemp(2) ,word normtemp(2),StartMin[2],StopHour(2),StopMin(2),word alarmhigh(2),StartHour(2),word alarmlow(2)]
i2cread SDA, SCL, $A0, $36,[lightsetHR(3),lightsetMN(3),lightoffHR(3),lightoffMN(3),word droptemp(3) ,word normtemp(3),StartMin(3),StopHour(3),StopMin(3),word alarmhigh(3),StartHour(3),word alarmlow(3)]
i2cread SDA, SCL, $A0, $54,[lightsetHR(4),lightsetMN(4),lightoffHR(4),lightoffMN(4),word droptemp(4) ,word normtemp(4),StartMin(4),StopHour(4),StopMin(4),word alarmhigh(4),StartHour(4),word alarmlow(4)]

Expected "]" but there is one at the end of the statement...
Edit:
Even when I corrected the StartMin[2] user error ! - still get the same !!

[Scampy]

It seems that as soon as I include the WORD statement it errors.

i2cread SDApin, SCLpin, $A0, $00,[lightsetHR(1),lightsetMN(1),lightoffHR(1),lightoffMN(1)]

compiles fine, but

i2cread SDApin, SCLpin, $A0, $00,[lightsetHR(1),lightsetMN(1),lightoffHR(1),lightoffMN(1),word droptemp(1),word normtemp(1)]

caused the Error:Expected"]" error message

Stumped !!!