I am trying to compile hello.c (The same code that comes with Keil Examples) using C51 from DOS and following these steps:
On DOS prompt I am typing
1. C51 hello.c src
2. A51 hello.src
3. BL51 hello.obj this creates 4 warnings and 0 error messages.
4. OH51 hello
Now my problem is that the hex file generated through these steps are not same as the file I get after compiling through uV2 from windows. Also the OBJ and LST are not same.I need the solution for this.
I am using Atmel 89S52 chip.
"3. BL51 hello.obj this creates 4 warnings and 0 error messages ... I need the solution for this. "
Did it not occur to you to say what the 4 warnings are?
How do you suppose that any one can fix them, if they don't know what they are!
The 4 Errors are
*** Warning L1: Unresolved External Symbol SYMBOL: _PRINTF MODULE: Hello.obj (HELLO)
*** Warning L1: Unresolved External Symbol SYMBOL: ?_PRINTF?BYTE MODULE: Hello.obj (HELLO)
*** Warning L1: Unresolved External Symbol SYMBOL: C_STARTUP MODULE: Hello.obj (HELLO)
*** Warning L1: Unresolved External Symbol SYMBOL: _PRINTF MODULE: Hello.obj (HELLO) ADDRESS:0817H
You should link your own Object file with standard library which contains external symbols like printf,etc you have refered in your own code.
You should link your own Object file with standard library which contains external symbols like printf,etc you have refered in your own code. Just include the library in the linker line even startupo etc can be 'library called' an example:
c:\tools\keil\c51\bin\bl51 SDstart.obj, SDisr.obj, SD485.obj, SDxdata.obj, ams.lib, c51s.lib TO ams.omf RS(256) IX
erik