I am getting this message when compiling
*** ERROR L107: ADDRESS SPACE OVERFLOW SPACE: DATA SEGMENT: _DATA_GROUP_ LENGTH: 00001CH Program Size: data=112.1 xdata=0 const=0 code=4492 Target not created
while i have 8192 bytes of On-Chip Memory, below size of 4096 bytes ,there is no problem and i have selected AT89x52.h header file. Memory Model: Small Code Rom Size: Compact So what is the problem??
The 8051 has many memory address spaces, not just one.
The message says "SPACE: DATA", which means you're running out of space in the 8051 data memory space. That's the 128 bytes of internal RAM, which is not the same memory as the generally larger external data or "xdata" memory space.
With the small memory model, parameters that don't fit into registers, local variables in functions, and temporaries will all be located in data memory unless they're explicitly declared to live somewhere else. Most likely, the overlay analysis has discovered that you need more than 128 bytes of data space to accomodate the local variables (etc) in your call tree. It's also possible you simply have more than 128 bytes of data in global variables.
If you have any large arrays or structures, try declaring them explicitly as xdata to move them into the larger memory. Be aware that access to this memory is usually slower and costs more code.
This so much of space is needed for sprintf() Because of float varible that contains ADC avg value, so much space is consumed. and i can't use xdata because i am not using any external RAM. I have only 256 bytes of RAM, and i have to display floating point. i have declared strings to code area.
How i can reduce consumption of RAM and Stack area of RAM?
First Avoid floating point if you can. Things like 3.001 volts = 3001 millivolts. Second printf() is big. You do not have to use it. You can write your own custom function. It will be smaller than the do it all printf()
Thanks to Drew and Neil! But i have to use floating point with necessity.
But i have to use floating point with necessity.
You need to reconsider this point. There are very few cases that require floating point operations, and most of these will require something significantly more powerful than an '51.
What requires floating point that cannot be done with fixed point ?
"You can write your own custom function. It will be smaller than the do it all printf()"
Of course, if you tried to do your own complete implementation of printf, it is extremely unlikely that you would come up with anything smaller!
Just take a look at the specification for printf: the specification alone usually runs to several pages - so, if you think about what it must take to implement all of that, you should not be surprised to find that printf is BIG!
Similarly, you should not be surprised that printf requires a certain amount of memory space for its own internal workings...
By writing your own version that implements only a small subset of the full printf's functionality, you should be able to make a considerable saving...
dear, i m facing similar problem as mention above, me too using 89c52 which have 8k rom , and compiler dont compile when it cross 4k rom, how we can use remianing rom in keil.
dear, i m facing similar problem as mention above, me too using 89c52 which have 8k rom , and compiler dont compile when it cross 4k rom, how we can use remianing rom in keil.<p>
Please start your own thread with a new question. Don't dig up ages-old threads to continue them with a vaguely-related question (that has a different answer).
To your original question: Are you sure that you are using the full version of uVision, and not one that is limited in code size ? Limited versions of uVision come with many development kits.
"Please start your own thread with a new question. Don't dig up ages-old threads to continue them with a vaguely-related question (that has a different answer)."
And, if you think that an old thread may be related to your new question, then simply place a Link to it in your new thread!
ok, i will start a new thread. secondly, i am using full version.