PSAD and variables question

RS_Jim

Hi All,
I am trying to debug some PASM code with PSAD and I haven't been able to figure out how to pass a Global variable to the cog that I am trying to debug. Any Ideas?
RS_Jim

lardom

JonnyMac wrote an excellent article in "Nuts and Volts" which should answer your variable questions. His amost recent article is HERE.

Ariba

If you pass the address of this global variable in the par register at cognew, then you can see the value of this variable with the MainRAM viewer. This viewer points per default to the MainRAM section beginning with the address from par. So the first 4 bytes in this view window show you the value, but you can switch the view to longs.

  cog := cognew(@myAsmCode, @myGlobalVar)   'start your cog to debug
  dbg.start(31,30,@myAsmCode)               'start debugger
  ...

Andy

davran

say a program snippet is like below

PUB
...
global_variable_pointer := @global variable
... somme codes etc.
DATA
'your cog's asm program
wrbyte local_cog_variable, global_variable_pointer 'moves data in local_cog_variable to global variable
...
local_cog_variable byte

or you can use the par register as below
cognew(@cogprog,@variablex)
..
cogprog
mov par,data
which loads data into the variablex through the par register

RS_Jim

Thanks Ariba.
Another question, can I start another cog to run in the background while I am running PSAD. Putting the debug start in a top object and starting the "debugged" obj in the same way as I would any other cog? I want to observe the interaction of the variables between the two cogs while debuging one.
RS_Jim

Ariba

This should be possible. You need to insert the 12-long kernel at the begin of the one cog to debug, but there can run other cogs at the same time.
Be aware that the debugged cog first goes in a Break and you have to start it with F5, while the other cog(s) run direct after the download.
Also Breakpoints and single stepping only happens to the debugged cog, the others just continue.

Andy

RS_Jim

Thanks Andy,
I will give that a try!.
RS_Jim

RS_Jim

Andy,
I finally got PSAD working like it should! Now if I could just figure out what the error is in my logic! lol.
RS_Jim