DSP/BIOS task priority levels

I can not think of a way of doing that with TSKs only, one idea that comes to mind is to use SWIs for the threads with higher priority.

SWIs are a bit different then tasks, but if you can adapt you program to use them, you get 15 more priority levels above the task with higher priority.

I thought that maybe it might be possible to change somehow BIOS kernel. I believe that number 15 was chosen because it's no too big (to slow down scheduling) and not small, too.

I thought that maybe there is a way to make number 15 custom. I found that in knl.h (in BIOS include directory) there is

#define KNL_MAXPRI  (15)    /* maximum task priority */

and in tsk.h TSK_Config structure:

Int     PRIORITY;

So there should be no problem to define KNL_MAXPRI to 32 since it's stored later in Int. Maybe scheduler is written in fixed way so it can support only 15 levels.

DSP/BIOS is designed for 15 task priority levels and I do not believe this value should be changed.

As Mariana indicated, you should consider the use of SWIs to increase the number of priority levels.

Harry.