What are the max. no. of priorities & tasks ?

Kernel
1

sachindbhujbal wrote on Tuesday, May 13, 2008:

Dear All,
     Can anybody tell me what is the max no. of priorities in FreeRTOs ? According to FreeRTOSConfig.h its max value is upto 0xFFFF FFFF(i.e. 4 bytes ).
What is the max. no. of tasks possible in FreeRTOs ?
     Please help me in this topic.
     Thanks in advance
     

2

davedoors wrote on Tuesday, May 13, 2008:

You can keep adding tasks until you run out of RAM.  There is no maximum.

3

sachindbhujbal wrote on Tuesday, May 13, 2008:

Dear Davedoors,
     Thanks for Your reply about tasks. But what about max no. of priorities in FreeRTOs ?
Is it as big as a unsigned long ?
Please reply,
Thanks.

4

saiberion wrote on Tuesday, May 13, 2008:

The maximum number of priorities can be defined with configMAX_PRIORITIES in FreeRTOSConfig.h

But I don’t think it’s usefull to use more than 5 priorities. And as far as I know: the more priorities the longer the switching time

5

sachindbhujbal wrote on Tuesday, May 13, 2008:

Saiberian,
     Thanks for reply.
     I know that but what is max value which we can configure there ?
One more thing that I didn’t get any defination tskIDLE_PRIORITY in source code. Can You tell where it is defined or what is it ?
Thanks.

6

rtel wrote on Tuesday, May 13, 2008:

I think its an odd question - I don’t see why its useful - but the actually answer is the maximum value a variable of type portBASE_TYPE can hold.  So if portBASE_TYPE is 32bit, this would be 0xffffffff.

tskIDLE_PRIORITY is 0, the tsk on the front tells you its defined in task.h.  I’m sure this information is on the WEB site.

Regards.

7

sachindbhujbal wrote on Wednesday, May 14, 2008:

Dear Richard,
   Thanks for Your reply.