topic Re: Compile a project with const variable alone (No Code) in CodeWarrior for MCU

Compile a project with const variable alone (No Code)

MSURESH — Fri, 12 Jun 2009 21:24:42 GMT

I am currently using MC9S12C64. I need to download some table (const strings and const linked list) into flash. I need to generate seperate s19 files for code and the table. This would enable me to download the tables seperately without having to download the code part of it.

Is this possible using code warrior?

I have been able to compile a project with only the data in the required flash pages, But i am not able to confirm this from the S-records in the s19 file.

Is some documentation on s-record available which could explain this?

Re: Compile a project with const variable alone (No Code)

stanish — Fri, 12 Jun 2009 21:52:53 GMT

Hello MSURESH,

To get the const tables as a S-record file you can:

1) load the complete project (Code+Const) into the Debugger (MCU or simulator)

2) save the area of memory that contains the const tables into S-Record file using debugger command line:

e.g.

save 0xED00..0xEE00 my_tables.s19

Stanish

Re: Compile a project with const variable alone (No Code)

MSURESH — Mon, 15 Jun 2009 13:50:59 GMT

Hi Stanish,

Thanks for your response. Your idea looks more of a work-around than a solution. My intention was to be able to compile 2 projects seperately and release the S19 files independant of each other.

One way of generating the hex file would be to have a dedicated utiltiy (C, VB, Excel (VBA script)) to generate the output file from the data (table). The Other way that i have tried is to use ENTRIES block in prm file to list the unrefernced variables to be retained as part of the output file. By this the compiler & linking does not eliminate the variables (data/ tables), even in the absence of code.

ENTRIES /* retain the following unreferenced variables */

my_file.c.o:* /* include all the variables in my_file.c */

END

I have now verified the output S19 file. It contains S1 & S2 records for the data I wanted. I was unsure of S0 record, but i got details on the record, this record contain only the name with path of the .abs file.