simple question how to do p1 par to get address of first variable in p2pasm from spin2

pilot0315

I have been attempting to perform a p1 asm variable address "lock" using my terminology to find a the start of the variable so I can pass data from spin2 back and forth from p2pasm.
Since P2pasm does not have a PAR function how is it done?

Thanks.
I want to pass from spin2 to p2pasm and back.

ersmith

In P1 the value passed to coginit/cogstart is placed in the "par" register. In P2 the value is placed in the "ptra" register instead.

Dave Hein

The setq instruction is used to set the value that is passed to ptra of the new cog. The cognew2 function in p2gcc looks like this:

_cognew2
       mov     r2, #$10
       setq    r1
       coginit r2, r0 wc
 if_nc mov     r0, r2
 if_c  neg     r0, #1
       jmp     lr

The value in r1 is passed to ptra of the new cog.

pilot0315

I will try that thanks.
Martin

pilot0315

I amended my p1 tutorial thanks for the help.