trunc function

[steveneads]

What is the best way to do the equivalent of "trunc" in code that runs in the kernel?

[Omron Forums Support]

Do you mean C code or PMAC Script?

[Omron Forums Support]

In the script environment, you can use "ceil" to round up and "floor" to round down.

[steveneads]

I am trying to use it in C code that is included with usrcode.c

[Omron Forums Support]

In C we also have the functions "floor" and "ceil". Below is a bgcplc 0 I used to test this.

 

void user_plcc()
{

pshm->P[0]=floor(9.3);
pshm->P[1]=floor(9.7);
pshm->P[2]=ceil(9.3);
pshm->P[3]=ceil(9.7);

pshm->UserAlgo.BgCplc[0]=0;
}

[steve.milici]

In C we also have the functions "floor" and "ceil". Below is a bgcplc 0 I used to test this.

 

void user_plcc()
{

pshm->P[0]=floor(9.3);
pshm->P[1]=floor(9.7);
pshm->P[2]=ceil(9.3);
pshm->P[3]=ceil(9.7);

pshm->UserAlgo.BgCplc[0]=0;
}

 

Just don't use it in CaptCompISR().

[steveneads]

Thank you - I've made it work using "floor" with some logic to adjust the result for negative inputs (as I wanted to round towards zero).

 

Is there an easy way to find a list of C functions that are and are not supported in the Kernel C code?