RAM over usage!!

domdom · Joined: 06 Sep 2006 Posts: 29

I have a few variables which consume large amount of RAM

Foppie · Joined: 16 Sep 2005 Posts: 138 Location: The Netherlands

2 things come up in my mind:

first: How are ClientID and ID defined?
second: Buffer is bigger than AIS_String, how do you handle this possible overflow?

AS answer on your question about handling your RAM problem: I would personally get rid of the AIS_String. The 16F877A doesn't have that much ram to play with so personnaly I would spare the RAM and make some functions that can calculate the crc by taking the pieces of the string piece by piece. Something like:

Ttelmah · Guest

Also, do you _need_ to use PASS_STRINGS_IN_RAM?. If it is only because you want to use pointers, then look at the #ROM declaration instead.

Best Wishes

rnielsen · Joined: 23 Sep 2003 Posts: 852 Location: Utah

One idea, albeit saves just a little, would be to use an int8 instead of a char to store data. For example, your ServerIP uses 16 characters to store your IP address. You could declare four int8 variables and store the same thing in less space, ie:

int8 ServerIP1 = 203;
int8 ServerIP2 = 251;
int8 ServerIP3 = 115;
int8 ServerIP4 = 154;

You could re-assemble/convert these numbers to be used later in your code. If there are other variables that could be done this way it might save a bit of space.

Ronald

ckielstra · Joined: 18 Mar 2004 Posts: 3680 Location: The Netherlands

If the checksum code is send after the bytes over which the checksum is to be calculated you can use another approach. This technique uses the unique CCS feature where you can redirect the output of fprintf to your own output function.

something like:

domdom · Joined: 06 Sep 2006 Posts: 29