TMS320F28388D: global variables

Hi Nagesh,

Please refer this link for the option.

Regards,

Vivek Singh

Hi Vivek, 

i am using compiler version : TI v18.1.3.LTS

the compiler flags are as below

-v28 -ml -mt --float_support=fpu32 -Ooff --include_path="C:/Users/E537053/Documents/GBL_DCPBA/GBL_F28388D" --include_path="C:/ti/ti-cgt-c2000_18.1.3.LTS/include" --advice:performance=all -g --diag_warning=225 --diag_wrap=off --display_error_number --gen_func_subsections=on --abi=eabi --zero_init=off

but after compiling i do get a warning as --zero_init=off is ignored what could be causing the compiler to ignore this flag.

<Linking>
>> WARNING: invalid compiler option --zero_init=off (ignored)
warning #10063-D: entry-point symbol other than "_c_int00" specified: "code_start"
Finished building target: "GBL_F28388D.out"

thanks,

Nagesh

Nagesh,

Moving it to compiler team to help.

Regards,

Vivek Singh

Hi Vivek, 

Thank you, its a linker command flag, i moved it there and the warning went.

also, I would like to know can I update the coestartbranch.asm file to disable the external watchdog which will be done via GPIO.

thanks,

Nagesh

Hi Nagesh,

Yes you can updated that code as per your application need. It is kind of part of application code only. We have just provided basic code for reference.

Regards,

Vivek Singh

Hi Vivek, 

Thank you for the response.

I was going through the f2838x_codestartbranch.asm. for the _c_int00 it says  boot._asm file can you please let me know where can I find this file for f2838x

'LB _c_int00         ;Branch to start of boot._asm in RTS library'.

Also, I have an external watchdog that needs refresh at 10ms, so my question is if I modify the code for f2838x_codestartbranch.asm to toggle any of the GPIO to refresh my external watchdog.

From point 3 if auto initialize variables take more than 10ms can we toggle any of the GPIO in between auto initialization?

thanks,

Nagesh

Nagesh,

As mentioned in the comment, it is part of TI provided library. I am not sure if it is recommended to change it. I'll have to refer this to our compiler team for their suggestion. 

Regards

Vivek Singh

NAGESH RK said:

-v28 -ml -mt --float_support=fpu32 -Ooff --include_path="C:/Users/E537053/Documents/GBL_DCPBA/GBL_F28388D" --include_path="C:/ti/ti-cgt-c2000_18.1.3.LTS/include" --advice:performance=all -g --diag_warning=225 --diag_wrap=off --display_error_number --gen_func_subsections=on --abi=eabi --zero_init=off

Please understand that using C2000 compiler version 18.1.x.LTS with EABI (the option --abi=eabi) is not a supported combination.  Support for EABI starts with version 18.12.0.LTS.  

Thanks and regards,

-George

Regarding the linker flag --zero_init=off, you say ...

NAGESH RK said:

its a linker command flag, i moved it there and the warning went.

I presume this means this particular problem is resolved.

Thanks and regards,

-George

Hi George,

Thank you for the response.

There is one more question for updating the boot28.asm file

I have an external watchdog that needs refresh at 10ms, so my question is if we can modify the code for f2838x_codestartbranch.asm/boot28.asm to toggle any of the GPIO to refresh my external watchdog in between the auto initialization of global variables.

From point 3 if auto initialize variables take more than 10ms can we toggle any of the GPIO in between auto initialization?

thanks,

Nagesh

Hi George, 

I think we had a discussion on this issue from our team and it was suggested from TI to go with this option as the Flash API library provided by Ti is compiled in 18.1.3.LTS and this was forcing us to go with this compiler version 18.1.3.LTS as it is used for Aerospace applications.

Please let us know if this is good.

We have procured the Flash Api code from TI and their suggestion was not to modify anything in the Flash Api code and use the same compiler used by Ti to create the library.

thanks,

Nagesh

Nagesh,

Our experts from TI will be reaching out to concern person in your company on compiler version topic. 

Let us know if you have any further query on boot time.

Regards,

Vivek Singh

Hi Vivek, 

There is one more question for updating the boot28.asm file

I have an external watchdog that needs refresh at 10ms, so my question is if we can modify the code for f2838x_codestartbranch.asm/boot28.asm to toggle any of the GPIO to refresh my external watchdog in between the auto initialization of global variables.

I basically want to add assembly code in boot28.asm to toggle the GPIO46 during the global variable initialization.

Please do let me know if we can configure the GPIO46 peripheral as output and toggle it during the auto initialization .

thanks,

Nagesh 

Hi Vivek, 

can you provide me the steps for writing the assembly code to toggle the GPIO46.

thanks,

nagesh