Data memory - explanation please

[Charles Linquis]

I'm convinced that I am missing something, but why can't you just save them as follows:

For X = 0 to 3
Write X,Array1[X]
Next X

For X = 4 to 7
Write X,Array2[X-4]
NextX

...

[malc-c]

Hi Charles,

Sorry, please bear with me as this is the first time I've experimented with saving data other than when programming mode.

I want to save the following to the PIC once the user has set them so that in the event of a power failure they are remembered and the user doesn't have to re-enter the data.

save:
Lcdout $FE,2
LCDOUT $FE,$80,"Saving Settings"
for fn= 0 to 3
write ,lightsetHR[fn]
write ,lightsetMN[fn]
write ,lightoffHR[fn]
write ,lightoffMN[fn]
write ,droptemp[fn]
write ,normtemp[fn]
write ,StartHour[fn]
write ,StartMin[fn]
write ,StopHour[fn]
write ,StopMin[fn]
next fn
pause 150
goto mainmenu

However as the program writes data to the memory at the time of programming and as part of the RTC settings (data@ 0,0 and data@150 respectively) I'm not sure what value to place before the colon after the word statement for each of the above. I don't want to corrupt the data stored at those data locations.

For example - 0x50 address in that table appears blank (FF) - so could I use

write 0x50 ,lightsetHR[fn]

Or whatever decimal 0x50 would be ???

Hope that's clear ?

Oh and I'm using DT's interrupts... would I need to use DEFINE WRITE_INT 1 withing that sub-routine ?

[rsocor01]

Yes, you can use 0x50 if you want to. There is nothing written there. Since 0x50h = 80 you can use something like this

for fn= 0 to 3
  write (10*fn + 80),lightsetHR[fn]
  write (10*fn + 81),lightsetMN[fn]
  write (10*fn + 82),lightoffHR[fn]
  write (10*fn + 83),lightoffMN[fn]
  write (10*fn + 84),droptemp[fn]
  write (10*fn + 85),normtemp[fn]
  write (10*fn + 86),StartHour[fn]
  write (10*fn + 87),StartMin[fn]
  write (10*fn + 88),StopHour[fn]
  write (10*fn + 89),StopMin[fn]
next fn

I haven't tested this code so I don't know if the (10*fn + 8x) works in the WRITE command. If it doesn't then try something like this

for fn= 0 to 3
  Mem_address = (10*fn) + 80
  write Mem_Address,lightsetHR[fn]
  Mem_address = (10*fn) + 81
  write Mem_address,lightsetMN[fn]
  Mem_address = (10*fn) + 82
  write Mem_address,lightoffHR[fn]
  Mem_address = (10*fn) + 83
  write Mem_address,lightoffMN[fn]
  Mem_address = (10*fn) + 84
  write Mem_address,droptemp[fn]
  Mem_address = (10*fn) + 85
  write Mem_address,normtemp[fn]
  Mem_address = (10*fn) + 86
  write Mem_address,StartHour[fn]
  Mem_address = (10*fn) + 87
  write Mem_address,StartMin[fn]
  Mem_address = (10*fn) + 88
  write Mem_address,StopHour[fn]
  Mem_address = (10*fn) + 89
  write Mem_address,StopMin[fn]
next fn

Oh and I'm using DT's interrupts... would I need to use DEFINE WRITE_INT 1 withing that sub-routine ?

You need to disable the interrupts for the WRITE command to work. I read somewhere in this forum that the WRITE_INT is only for WRITECODE, but you might want to try it.

Robert

[malc-c]

Robert,

Thanks for the assistance. I'll give it a try and no doubt will be back with some feedback

[malc-c]

Robert,

Thank you. The first version works a treat !

[rsocor01]

Robert,

Thank you. The first version works a treat !

Good to hear that .

What program did you use in your first post to see the contents of the EEPROM memory? That seems to be very helpful. I could use it for my own projects.

Robert

[malc-c]

Good to hear that .

What program did you use in your first post to see the contents of the EEPROM memory? That seems to be very helpful. I could use it for my own projects.

Robert

I have an easyPIC5 development board and that is part of the software that squirts the HEX to the PIC - http://www.mikroe.com/eng/products/v...opment-system/

Not sure if the PicFLASH2 software will work with other programmers, but it will work with one of their other products http://www.mikroe.com/eng/products/view/392/picflash2/

The software is a free download