Data memory - explanation please

[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

[malc-c]

Uhmm maybe I spoke too soon...

I have a menu section, which in tern selects sub menus to set the various variables up and then return back to the main menu. The last option of the main menu is this

LCDOUT $FE,1 
Gosub SetButtonRelease
Lcdout $FE,2
LCDOUT $FE,$80,"Saving Settings"
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]
  write (10*fn + 90),alarmhigh[fn]
  Write (10*fn + 91),alarmlow[fn]
  
next fn
pause 150
goto main

which when selected should write all the variables to memory before going to the main program.

On powerup the values are read back in as part of the initialisation

for fn= 0 to 3
  read (10*fn + 80),lightsetHR[fn]
  Read (10*fn + 81),lightsetMN[fn]
  Read (10*fn + 82),lightoffHR[fn]
  Read (10*fn + 83),lightoffMN[fn]
  Read (10*fn + 84),droptemp[fn]
  Read (10*fn + 85),normtemp[fn]
  Read (10*fn + 86),StartHour[fn]
  Read (10*fn + 87),StartMin[fn]
  Read (10*fn + 88),StopHour[fn]
  Read (10*fn + 89),StopMin[fn]
  Read (10*fn + 90),alarmhigh[fn]
  Read (10*fn + 91),alarmlow[fn]
  
next fn

the strange thing is that the normaltemp, alarmhigh and alarmlow values don't appear to of been saved (or are being misread in some way).

Interestingly, the data view doesn't show anything at 80

[malc-c]

I think I've discovered part of the problem, in that I'm using word rather than bytes.

The manual states:

To write a word, each of the 2 bytes that make up the word must be
written separately:
w Var Word
WRITE 0,w.BYTE0
WRITE 1,w.BYTE1

I'm a little stumped as to how I need to write and read back a mixture of byte and word, the values which are words are typically represented as three digit numbers eg: 567 thus represents 56.7 degrees, so the alarmhigh(fn) will all be three digit numbers