Posting a Semaphore by a HWI

Sebastian D.

Other Parts Discussed in Thread: SYSBIOS

Hi,

i want to post a semaphore via a HWI to wake the Task waiting for the completion of an EDMA request.
I came to the following cfg code, but this results in a linker error, indication that Semaphore_post cannot be resolved.
This is most likely, because the argument of Semaphore_post is not an uint32_t.

Is there an other method to post the Semaphore without writing an own ISR posting the Semaphore?

Thanks for your help,

Sebastian

Here the cfg code:

var Semaphore = xdc.useModule('ti.sysbios.knl.Semaphore');
var CpIntc = xdc.useModule('ti.sysbios.family.c66.tci66xx.CpIntc');

var semaphore0Params = new Semaphore.Params();
semaphore0Params.instance.name = "sem_aif_edma_completion";
semaphore0Params.mode = Semaphore.Mode_BINARY;
Program.global.sem_aif_edma_c2_completion = Semaphore.create(null, semaphore0Params);

    /* Transfer completion ISR */
CpIntc.sysInts[24].fxn = '&Semaphore_post';   //function pointer to the HWI function
CpIntc.sysInts[24].arg = Program.global.sem_aif_edma_c2_completion;       //argument to the HWI function
CpIntc.sysInts[24].hostInt = 8;
CpIntc.sysInts[24].enable = true;   //enable interrupt at startup

/* Transfer completion ISRs */
CpIntc.mapHostIntToHwiMeta(8, 4);

over 13 years ago

0 studinstru sggs over 13 years ago

Expert 2335 points

Hi Sebastian,

Can you just mention the version of CCS and SYS/BIOS +Your hardware details ????

-Studinstru

0 Sebastian D. over 13 years ago in reply to studinstru sggs

Intellectual 265 points

we are using bios_6_33_04_39 on a C6670 with Compiler Version 7.3.7.

The event i want to handle is a C66x CorePac Secondary Interrupt (Event# 24) and therefore is handled via the Chip Interrupt Controller (CpIntc).

But the linking error also occurs for a normal HWI like this:

Program.global.hwi_4 = Hwi.create(4, "&Semaphore_post", hwiParams);

Here is the Linker error:

undefined      first referenced
symbol            in file
---------      ----------------
Semaphore_post /home/xxx/bios/debug/configPkg/package/cfg/bios_pe66.oe66

using Semaphore_post(sem_aif_edma_c2_completion); in other parts of the code works fine.

0 Ashish Kapania over 13 years ago in reply to Sebastian D.

TI__Mastermind 21645 points

Hi Sebastian,

You cannot call a XDC spec'ed function like Semaphore_post() from a static Hwi. You will need to write a simple ISR handler wrapper to call Semaphore_post(). Something like this:

#include <ti/sysbios/knl/Semaphore.h>

// Install mysem_post as the handler in your .cfg

mysem_post(UArg arg) {

return Semaphore_post((Semahore_Handle)arg);

}

Best,

Ashish

0 Ashish Kapania over 13 years ago in reply to Ashish Kapania

TI__Mastermind 21645 points

I want to add to my earlier post. The reason why you cannot directly register XDC-spec'd functions with the dispatcher is because there is a bug with xgconf tool.

Best,

Ashish

0 Sebastian D. over 13 years ago in reply to Ashish Kapania

Intellectual 265 points

I noticed, that i should have used "&ti_sysbios_knl_Semaphore_post__E" . This directly leads to an error in building the RTSC configuration project:

"package/cfg/bios_pe66.c", line 3784: error: declaration is incompatible with "void ti_sysbios_knl_Semaphore_post__E(ti_sysbios_knl_Semaphore_Handle)" (declared at line 343 of "/opt/ti/mcsdk/bios_6_33_04_39/packages/ti/sysbios/knl/Semaphore.h")
1 error detected in the compilation of "package/cfg/bios_pe66.c".

So i will use a small HWI like in your previous post.

Thanks, Sebastian

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Posting a Semaphore by a HWI