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

pilot0315 · 2019-02-03 04:07

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 · 2019-02-03 11:14

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 · 2019-02-03 12:24

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 · 2019-02-03 18:04

I will try that thanks.
Martin

pilot0315 · 2019-03-17 03:26

I amended my p1 tutorial thanks for the help.

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

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