S12 / MagniV MicrocontrollersのトピックShowing warning while using ssem and csem function for semaphore lockig and unlocking respectively

Showing warning while using ssem and csem function for semaphore lockig and unlocking respectively

maddularajesh — Fri, 02 Feb 2018 05:35:40 GMT

I defined as follows with MC9S12XEP100 and using main CPU and XGATE.

#define SET_SEMPHR_XGATE(sem_id) while((!_ssem(sem_id))&&(UI_t)(t1msec-Xgsem_timer)<msec1)){};

#define CLR_SEMPHR_XGATE(sem_id) _csem(sem_id)

SET_SEMPHR_XGATE(0)

CLR_SEMPHR_XGATE(0)

But while compiling with IDE 5.1 it showing as follow warnings

warning: C1801 Implicit parameter declaration for '_ssem'

warning: C1801 Implicit parameter declaration for '_csem'

warning: C1420 Result of function call is ignored (showing at CLR_SEMPHR_XGATE(0) )

In example programs also _ssem & _csem are not available.

Please provide solution to eliminate all warnings as soon as possible.

Thank you,

Rajesh.

RadekS — Mon, 12 Feb 2018 15:39:01 GMT

Hi Maddula,

You are right, it seems that _csem() and _csem() functions are not implemented in CW files – just defined in intrinsics_xgate.h file.

In fact, such functions may be quite redundant since they should do just single assembler commands.

You may use

asm SSEM #sem_id‍

instruction for semaphore locking try.

Additionally, you should check result whether semaphore was locked or not.

Similarly, you may use

asm CSEM #sem_id‍

for semaphore release.

Please look at attached simple example code.

I hope it helps you.

Best regards

Radek