assembly coding in keil

"thought it would help hasten the process"

It might save you the odd second or two of typing (although "wannna" is no quicker than "want to"), but it means that every one else has to struggle to decipher your meaning!


" i used STARTUP.S: Startup file for Philips LPC2000 ... contained a very simple programme:"

No, it is not a program!

This is the code that runs before a 'C' program can start - it sets up all the stuff required for the 'C' program.
It is not a program in itself - that's why you are getting the errors:

"undefined symbol _main (referred frm startup.o)"

As you know, every 'C' program starts with a function called main().
As it's a function, something has to call it - in the case of an embedded system, that "something" is the startup code!

The startup code is meaningless on its own - its whole raison d'etre is as a preamble to the main 'C' code!

"tring to use KEIL microversion3 arm development tool kit ....which i dowmloded"

Note that's "microvision" - not "microversion"

That download comes with a whole folder full of examples - take a look for an assembler sample.

"thought it would help hasten the process"

It might save you the odd second or two of typing (although "wannna" is no quicker than "want to"), but it means that every one else has to struggle to decipher your meaning!


" i used STARTUP.S: Startup file for Philips LPC2000 ... contained a very simple programme:"

No, it is not a program!

This is the code that runs before a 'C' program can start - it sets up all the stuff required for the 'C' program.
It is not a program in itself - that's why you are getting the errors:

"undefined symbol _main (referred frm startup.o)"

As you know, every 'C' program starts with a function called main().
As it's a function, something has to call it - in the case of an embedded system, that "something" is the startup code!

The startup code is meaningless on its own - its whole raison d'etre is as a preamble to the main 'C' code!

"tring to use KEIL microversion3 arm development tool kit ....which i dowmloded"

Note that's "microvision" - not "microversion"

That download comes with a whole folder full of examples - take a look for an assembler sample.

Note that Keil has 3 versions of ARM tools: Realview, CARM, and GNU.
Which one are you using?

Realview is the current Keil product;
CARM was the original Keil product;
GNU is not a Keil product at all - see http://www.keil.com/forum/docs/thread7842.asp

For assembler examples, you need to be sure that you have the right source code to go with your particular tools!

For GNU support, you could try http://www.gnuarm.com/ or just put "GNU ARM Assembler" into your favourite internet search engine...

There's 3 links at http://www.gnuarm.com/resources.html

resp. sir,
in keil mVISION3 ,i am using realview tool and for new project i opted device LPC2101 of phlips.and added to it the 'startup.s' file then the file with my assemble code i added,which was a ".s" file.containing
TTL ch4ex1 - move16
AREA Program,CODE,READONLY
Main
LDRB R1,Value
STR R1,Result
SWI &11

Value DCW &C123
ALIGN
Result DCW 0

END
i then builded the target and found the following error:
undefined symbol _main(referred frm startup.o)
indefinrd symbol _use_two_region_memory (referred frm startup.o)
whics is same when i posted my first query.
can you please help me getting the taget bulid and also tell me if i am reght that we can use "keil microvision3" for assembly language coding of embeded systems.