c5114.txt

dsp&c51的编程,从小百合上down的

发信人: reflection (似水流年), 信区: EEtechnology 
标  题: C51 Primer (13) Outputs from C51 
发信站: 南京大学小百合站 (Wed Nov 24 12:05:12 1999), 转信 
  
  
13 Outputs From C51 
13.1 Object Files 
Being closely related to the original Intel tools, C51 defaults to the Intel 
 object file format. This is a binary file containing the symbolic informati 
on necessary for debugging with in-circuit emulators etc.. It may be linked 
with object files from either Intel PLM51 or ASM51 using the Keil L51 linker 
. The final output is Intel OMF51. 
Versions >2.3 of the compiler will produce an extended Intel OMF51 object fi 
le if the DEBUG OBJECTEXTEND command line switches are used. This passes typ 
e and scope information into the OMF51 file which any debugger/in-circuit em 
ulator should be able to use. The extensions to the original Intel format ar 
e a proprietary Keil development but have been widely copied by IAR et al. 
13.2 HEX Files For EPROM Blowing 
To blow EPROMS an additional stage is usually necessary to get a HEX file. T 
his is an ASCII representation of the final program without any symbol infor 
mation. Almost every EPROM programmer will understand Intel HEX. The OH51/OH 
S51 utility performs the conversion from the linker's OMF51 file to the stan 

dard 8bit Intel HEX format. 
13.3 Assembler Output 
Optionally, a valid A51 assembler/C source listing file can be produced by C 
51 if the SRC command line switch is used. This has the original C source li 
nes interleaved with the assembler and is very useful for getting to know ho 
w the compiler drives the 8051. 
Do not be tempted to try hand-tweaking the compiler's efforts. Whilst you ma 
y be able to save the odd instruction here and there, you will create a tota 
lly unmaintainable program! It is much better to structure source code so th 
at you write efficient code from the start. Simple, efficient C will produce 
 the best 8051 code. 
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