Passing arguments to a SWI

TommyG

I want to setup DSP BIOS SWI and define 1 or 2 arguments to be passed to the SWI. How do I define the arguments in my code? Should they be declared as globals? It is not very clear in the DSP BIOS User's Guide.

Thanks.

over 15 years ago

0 Arnie Reynoso over 15 years ago

TI__Expert 6860 points

Use the SWI_setattrs () API to change the attributes of an existing SWI object.

The SWI_attrs are defined as follows:

SWI_Attrs {
    SWI_Fxn     fxn;
    Arg         arg0;
    Arg         arg1;
    Int         priority;
    Uns         mailbox;

In your code you could change arg0 and arg1 so that next time when the SWI is posted, the function specified in the attribute will use these arguments. For example:

swiattrs = SWI_ATTRS;
swiattrs.priority = 1;
swiattrs.fxn = (SWI_Fxn)mySwiFunction;
swiattrs.mailbox = 1;
swiattrs.arg0 = 1;
swiattrs.arg1 = 2;
SWI_setattrs(swi, &swiattrs);

void mySwiFunction (Arg i, Arg j)

{

// Do something

}

The mySwiFunction will be called with the above arguments the next time the SWI is posted.