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internal eeprom initialize. problem

 
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jaikumar



Joined: 15 Dec 2006
Posts: 109

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internal eeprom initialize. problem
PostPosted: Fri Jul 14, 2017 2:42 am     Reply with quote
Hi,

ccs compiler/ide - 5.073
pic microcontroller: PIC16F1825

Please see this code. I am initializing the internal EEPROM and data in debugger
shows values that are different. Can someone please explain.

Code:

#rom getenv("EEPROM_ADDRESS")={
 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75,
 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75,
 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75,
 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75,
 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75,
 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75,
 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75,
 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75,
 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75,
 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75,
 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75,
 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75,
 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75,
 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75,
 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75,
 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75, 75}

int8 taskCount;
int8 wdEEPROM[256];


for (taskCount=0; taskCount==255; taskCount++)
   {
       WDeeprom[taskCount] = read_eeprom(taskCount);                   
   }                 


When debugging, the WDeeprom shows = {75.....till 253 count and after
that for 254 and 255, I always get a constant value of 50.

Thanks,
Jai.
jaikumar



Joined: 15 Dec 2006
Posts: 109

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PostPosted: Fri Jul 14, 2017 4:50 am     Reply with quote
I added a bit of delay in the loop reading eeprom and it is working ok.
I always thought you need delay only for writing. - well maybe someone can explain.

thanks.
temtronic



Joined: 01 Jul 2010
Posts: 9225
Location: Greensville,Ontario

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PostPosted: Fri Jul 14, 2017 4:57 am     Reply with quote
A quick thought...
the #ROM defaults to a 16 bit value but in your program you retrieve the data as an int8.
you are allowed to #ROM int8 ..... according to the manual, so I'd add int8 to #ROM and see what happens...

others who use this everyday may know the real solution....

Jay
jaikumar



Joined: 15 Dec 2006
Posts: 109

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PostPosted: Fri Jul 14, 2017 6:59 am     Reply with quote
I figured it out.
for some reason for loop is not working. i try a while loop and it works just
fine. is it a bug or am i not doing the for loop properly.

Some one can please clarify.

thanks
newguy



Joined: 24 Jun 2004
Posts: 1907

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Re: internal eeprom initialize. problem
PostPosted: Fri Jul 14, 2017 7:12 am     Reply with quote
jaikumar wrote:
Code:

int8 taskCount;
int8 wdEEPROM[256];

for (taskCount=0; taskCount==255; taskCount++)
   {
       WDeeprom[taskCount] = read_eeprom(taskCount);                   
   }                 



Your for() loop is a little weird in that the test is usually to see if the index is less than or greater than some value; you have a test for if it's equal to 255. I've just never seen it structured in that manner.

Try declaring taskCount as an int16 and change the test on it to be < 256. See what that does.
jaikumar



Joined: 15 Dec 2006
Posts: 109

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PostPosted: Fri Jul 14, 2017 7:30 am     Reply with quote
yes newguy it works when i do it like below:

Code:

for (loop=0; loop < (int16)256; loop++)
  {
   data = read_eeprom((int8)loop);
   printf("Data:%u  %u \n\r",(int8)loop, data);
  }


I realize it's not used that way. but logic seems correct. i will check it in
visual c++ tomorrow.

Thanks.
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