TMS320F280039C: Scheduler implementation

Hello David,

Here are a couple suggestions/inputs:

1. On the C28 CPU interrupts are non-nesting by default. So while the control ISR is executing it will not be preempted. If possible structure the interrupts such that scheduler interrupt and control interrupt are staggered. 

2. The F280039c has C28 and CLA cores which run independently. So the other option is to have the CLA which is control optimized, run the control ISR/task and the C28 run the scheduler ISR. Many of our examples in Motor Control SDK demonstrate this.

Let me know if you need any more inputs.

Thanks,

Ashwini 

Hello Ashwini,

Thank for your recomendations. I have one more question about the scheduler implementation. How should be the best way to detect the cpu ends up out of resources? For example, due to control interrupt load, the scheduler ends up not executing X task or the interrupts are overlapped and delayed. By best way, I refer the safest and fastest way to detect this kind of issue and activate a safety reaction.

David 

Hi David, 

One way is to have a watchdog configured to detect this. Which scheduler are you using? I am not too familiar with the FreeRTOS scheduler but do see some posts on FreeRTOS forum on this topic that may help.

https://forums.freertos.org/t/where-should-i-update-or-clean-the-watchdog-with-freertos/13754/10

Let me know if you need further help.

Thanks,

Ashwini

Hi ashwini,

We are actually interested in implementing a minimal scheduler custom made. That is why I wanted to know which is the fastest and most secure way to manage different tasks.

David

Hi David,

I see. Let me know if you need any more info or have any other questions.

Thanks,

Ashwini