How to link ? Help !

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Read-Only Author Stephane REY Posted 27-Aug-2002 13:00 GMT Toolset C51	How to link ? Help ! Stephane REY I'm using the uVison 1 and I'd like to build my project. My example project should include the CSTARTUP.OBJ and some compiled C files There is two methods : 1. with IDE 2. with command line For both, I've some troubles, may someone help me ? 1.With IDE ---------- When linking a project with more than one function, the main function is no longer located to 0000h. So I d'like to include the CSTARTUP file where I wrote : NAME ?C_STARTUP ?C_C51STARTUP SEGMENT CODE ?STACK SEGMENT IDATA RSEG ?STACK DS 1 EXTRN CODE (main) PUBLIC ?C_STARTUP CSEG AT 0 ?C_STARTUP: LJMP main But I didn't found in the options of the IDE uVision 1 how to include the CSTARTUP.OBJ in my linking commands and how specify where it should be located ??? 2. With command line -------------------- So I've linked with the following command line : BL51 @lnk.lnk where lnk.lnk is a command file including : C:\TRX8051\CSTARTUP.OBJ, & C:\TRX8051\MAIN.OBJ, & C:\TRX8051\HLCD.OBJ, & C:\TRX8051\INIT.OBJ, & C:\TRX8051\RREX.OBJ & TO C:\TRX8051\TRX8051 & IX NODS NODP NODL NLIB RS(128) PL (68) PW(78) and then executing OH51 to convert into Hex file. The problem is : how to specify that CSTARTUP should be located to 0000h and then jump to the main() function ??? Thanks for your help Stephane

Read-Only Author Mark Odell Posted 27-Aug-2002 13:37 GMT Toolset C51	RE: How to link ? Help ! Mark Odell main() should never be located at 0x0000. 0x0000 is the reset vector. main() cannot be called until the C run-time has executed. Typically the C run-time copies the .data section variables from ROM to RAM, zeroes the .bss section, sets the stack pointer and any other CPU registers appropriately, and then calls main(). Since the C run-time must run before main() it follows that it should be located at 0x0000 and main() just goes where ever it goes. The Keil C run-time is automatically linked against so it should be there. If you wish, you can override it or see what it does by looking at cstartup.a51.

Read-Only Author Alan Chen Posted 27-Aug-2002 15:09 GMT Toolset C51	RE: How to link ? Help ! Alan Chen But I didn't found in the options of the IDE uVision 1 how to include the CSTARTUP.OBJ in my linking commands and how specify where it should be located ??? You are already doing it by saying: CSEG AT 0 ?C_STARTUP: LJMP main I think you might be a little bit confused about an object file and an actual code segment. You can't locate an object file to a particular location, but you can locate a segment of object code to a particular location. For example, you can locate your main() to program memeory 0x0100 by adding this line to your ink.ink code(?PR?MAIN?MY_FILE_NAME(0x100)) These two articles may help you: http://www.keil.com/support/docs/2156.htm http://www.keil.com/support/docs/2263.htm

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