Newbie ASM Question-Resolved

tom90

Hey All,

Can I make arrays in asm and pass them to cogs running spin? I want to continually write word sized data into 150 memory spaces until i tell it to stop, then i can manipulate the data in the 150 words. Can i make an array of 150 words in asm, and if so how?

Thanks
Tom

Post Edited (tom90) : 2/24/2009 8:40:26 PM GMT

TreeLab

The only way that cog #1 can see what cog #2 is doing or the results of a calculation is if cog #2 sends it out to hub memory with a wrxxx instruction (byte/word/long); presumably, the code running on the two cogs have already agreed on where to store the data in hub so both can get to it. You can reserve space in a cog to store information, but that cog must make it externally visible via the hub.

Cheers!
Paul ROwntree

Ale

If you are new to asm, and especially propeller assembler, I'D recommend you have a look at the following thread that has some useful sub-threads linked:
http://forums.parallax.com/showthread.php?p=786265

You just declare the array in spin, and give your asm routine (not yet launched) the address via the @ operator:

var
   my_array_name : long[noparse][[/noparse]150]
...

cognew(my_asm_routine, @my_array_name]

...
DAT
    org
my_asm_routine
    mov ptr_to_array, PAR    ' PAR contains the value passed via cognew

...

ptr_to_array    long   0    ' Variable that will contain the value in PAR

There are other ways

tom90

Thanks Everyone,

Ale, i have already used the parameter for another variable (I should have mentioned this in my first post). That being said, I think I figured out how to take care of my problem without using an array.

Thanks for your responses.
Tom

Ale

When you have not yet launched your asm code, you can write to ptr_to_array directly, and so avoid the use of the PAR for that, like in the VGA examples by Chip Gracey (obex).

schwiegjc

To move data from ASM to SPIN

wrlong value, par

If the variable address is an array, then how do you reference the other indexes of the array

I have tried, but it did not work

wrlong value, par+1

Unsoundcode

Hi schwiegjc, I was kind of curious about that myself and came up with this solution but I'm unsure if it's the right solution.

·········· mov ptr_to_array, PAR
···········add ptr_to_array,#1····· 'reference to array element [noparse][[/noparse]1]
···········wrbyte number,ptr_to_array

······· ptr_to_array·· long·· 0


@those who are skilled with ASM is this the right way?

thanks

Jeff T.

EDIT: the above is not the original solution I posted , I walked away from the computer and realized I had unwittingly answered my own question ( I think ). I too was at first trying to solve it using the "+" operater , a mild case of tunnel vision. If the above is indeed correct I see it is a considerable advancement , for now with using Spin and a serial object I can debug the results of sample asm code to a terminal.


Post Edited (Unsoundcode) : 2/26/2009 7:46:06 PM GMT