TMS320F28P550SJ: How to debug two 28p55 dsp that are connected in dasiy-chain using only one xds100v3 isolated debug probe?

Hello, 

Can you share the console error message? What version of CCS are you using?

There is a limitation of two hardware breakpoints when working flash. Can you try not having any breakpoints in the master DSP and see whether you can set breakpoint in the slave DSP?

Best,

Matt

Hello,

Yes, I can show you the message. Following the first one is the screenshot of the console and I use the CCS v12.8. You can see I put only one HW breakpoint in the slave DSP but it was wrong. However I found that I can put a breakpoint into the interrupt service routine of the slave DSP but I can not put it in the task.

When I put the same breakpoint into the master DSP, it works successfully. Let me show you in the second screenshoot.

Hello,

That is unusual. I have a few clarifying questions:

1. Are you using any compiler optimizations?
2. Did you load the symbols for the program on the slave DSP before setting the breakpoint?

Best,

Matt

Hi,

1. Yes, I am using optimization level-2;

2. No, I just load the program and click run it.

Additionally, I found that I can put software breakpoint in the slave DSP but I can not put hardware breakpoint in the slave DSP. I am using FreeRTOS. When I try to set breakpoints in a task, it fails. This is because tasks generally run in flash memory. However, setting breakpoints in functions located in the ramfuncs section works successfully. So I want to know if the daisy-chain topology supports setting hardware breakpoints in the code of the slave DSP?

Best,

Mingbo Song

Hello,

Hardware breakpoints are supported in daisy-chain topologies. 

songmingbo said:

1. Yes, I am using optimization level-2;

Can you try turning compiler optimizations off?

Also, please try removing potential "hidden" breakpoints: https://software-dl.ti.com/ccs/esd/documents/troubleshooting_no-aet-resources.html#resolution

Best,

Matt

Hello.

Sure, Now I have turned off the optimizations and removed all of the breakpoints, but I'm quite sure this still isn't working. 

Could you please take the board you have on hand and conduct an experiment to see if it is really possible to set hardware breakpoints in the flash code of the slave DSP?  If it's possible, thank you very much.

Hello,

I will attempt this test tomorrow. In the meantime, I'll loop in the CCS experts to see if they can provide additional assistance.

Best,

Matt

 Ki ,

Yes, this happens when they are attempting to set hardware breakpoints (in the flash). Software breakpoints (in the ramfuncs) do not have this issue and work as intended.

Best,

Matt

Matt - thanks for trying this out. It is likely related to that other ticket I mentioned. I will mention this to engineering to see if we can get an update.

Hello, Ti expert.

I discussed this with engineering and they will look to address this with the CCS 20.4.0 release scheduled for the end of the year.