CCS/TMS320F28035: Program not loading

Brandon Dyer

Part Number: TMS320F28035

Tool/software: Code Composer Studio

I am working on loading code onto the TMS320F28035. I am using the latest version of Code Composer Studio and am using JTAG to connect to the MCU. I am using the example "GPIO Toggle" that comes with C2000, changing only the GPIO's I am wanting to toggle. I have no problem getting the project to build and debug. However, the debugger halts running the code when it connects. And when I hit resume the GPIO's do not change states. I am, however, able to step through the code and it works as expected, toggling my LEDs on and off. Is there any other steps other than importing the example project into the workspace that I must take in order to get the code work without stepping through it? Note: I have not changed any example files other than selecting example 3 in the main source code and changing the GPIO values I want to toggle. Thank you for any help you can provide.

over 7 years ago

0 Ki over 7 years ago

TI__Guru**** 472411 points

Hi Brandon,

Yes, this is odd behavior and I can reproduce it. Stepping or setting breakpoints in in Gpio_example (and running to them) will toggle the LEDs but not a straight run. I am investigating and will let you know of any updates

Brandon Dyer said:
However, the debugger halts running the code when it connects.

This part is expected. The default behavior of CCS is to halt the target on connect

Thanks

0 Ki over 7 years ago in reply to Ki

TI__Guru**** 472411 points

I found the main cause. The loop in delay_loop is too small. The LEDs toggle so quick that it is not noticeable. Increase the size to make the toggle noticeable. For example I increased it to 20000 (and made 'i' a double)

We will notify the C2000 team to fix the example

Thanks
ki

0 Brandon Dyer over 7 years ago in reply to Ki

Intellectual 610 points

Ki,
Changing the delay did fix the problem. My LED's are flashing as expected. I do have one question though. I want to be able to have my code run after a hard reset or power cycle. As of now, my code works as long as it is not powered off and on, as if the code is loaded to RAM. How do I load the code so that it is not erased upon reset. Thanks.

0 Ki over 7 years ago in reply to Brandon Dyer

TI__Guru**** 472411 points

For that particular example, the code is indeed loaded to RAM. If you wish to load to Flash, you need to use a different linker command file. Go to the project properties and change the linker command file to the one shown below (select it in the drop down list)

This one will have the code loaded to flash.

As you can see, where code gets loaded is controlled by the linker command file. If you are curious about how this works, see the below link:

http://dev.ti.com/tirex/#/?link=Development%20Tools%2FIntegrated%20Development%20Environments%2FCode%20Composer%20Studio%2FProjects%20and%20Build%2FDocuments%2FApplication%20Notes%2FLinker%20Command%20File%20Primer

Thanks

0 Brandon Dyer over 7 years ago in reply to Ki

Intellectual 610 points

Ki,

This solved my problem. Last time I used F2835.cmd linker I locked up the MCU because I lost power while it was erasing the memory sectors. I didn't know for sure if it was the right linker file at the time so I was scared to use it this time lol. Thanks for the help!

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CCS/TMS320F28035: Program not loading