ASM ref to Main memory OTHER than PAR passing address ?

Comments

• Paul Baker Posts: 6,351

  2006-06-07 16:38 edited 2006-06-07 16:38

  @ is a run time operator, as such its value cannot be obtained at compile time in order to be assigned to a constant. However theres is nothing preventing you from setting the value in your spin program _before_ calling cognew. So you could do the following:
  
  PUB VgaTextDemoStart | i
  · AddressOfCtrAsmMainMem := @CtrAsmMainMem
  · cognew(@asm_entry, 0) 'launch assembly program into a seperate COG
  · repeat
  ··· text.str(string($A,1,$B,4,8)) 'set location
  ··· text.bin(CtrAsmMainMem,32) 'display counter in binary
  
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  Life is one giant teacup ride.
• CJ Posts: 470

  2006-06-08 02:19 edited 2006-06-08 02:19

  just define your long(don't use RES) that will be loaded into the cog then at runtime before launching the cog, put in a line that goes something like this
  
  before launching the cog
  dat_long := @variable
  
  in the DAT section
  dat_long LONG 0
  
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  Who says you have to have knowledge to use it?
  
  I've killed a fly with my bare mind.
  
  Post Edited (CJ) : 6/8/2006 2:33:39 AM GMT
• Phillip Y. Posts: 62

  2006-06-08 02:31 edited 2006-06-08 02:31

  If I use AddressOfCtrAsmMainMem res 1
  Error "expected an instruction or a variable"
  
  If I use AddressOfCtrAsmMainMem long 0
  no compile error and program works fine
  and after comenting out the line to transfer via PAR, program works fine.
  
  As far as I under stand the only difference is that the ** Long 0 is initalised and the ** RES is not initalised
  and in either case "AddressOfCtrAsmMainMem" should be in the COG memory after the ASM program code.
  
  Core docs, hub instructions p7, "WRLONG D,S 'Write D into long at S"
  D points to the COG memory with the data to write
  S points to the COG memory with the pointer to the main memory address that the data will be moved to.
  
  So how can the spin program do AddressOfCtrAsmMainMem := @CtrAsmMainMem before the asm COG is launched in the next line ?
  I thought that spin running in a COG can't store in to another COG if that is where "AddressOfCtrAsmMainMem" is located.
  
  Revised program is atached.
  
  I just saw the other post
  
  just define your long(don't use RES) that will be loaded into the cog then at runtime before launching the cog, put in a line that goes something like this
  
  dat_long := @variable
  
  This is becoming more confusing, just what is done by compiler and spin and when and where ?
  
  At least the revised program works.
  
  Phillip Y.

  spin

  spin

  vga_text_demo_PY_mpg4.spin

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  vga_text_demo_PY_mpg4.spin 6.2K
• CJ Posts: 470

  2006-06-08 02:43 edited 2006-06-08 02:43

  from what I can tell, RES just names a cog register beyond what the asm program takes up (name access rather than by address, compiler handles translation), whereas LONG creates spin accessible data that is also convieniently loaded into the cog at launch(name accessible from spin and assembly)
  
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  Who says you have to have knowledge to use it?
  
  I've killed a fly with my bare mind.
• Phillip Y. Posts: 62

  2006-06-08 06:01 edited 2006-06-08 06:01

  I finaly understand how it works, using the VGA display helped, by displaying addresses and data untill I could figure it out.
  
  PUB VgaTextDemoStart | i
  · AddressOfCtrAsmMainMem := @CtrAsmMainMem ' overwrites DAT AsmMainMem long 0 in MAIN memory
  · cognew(@asm_entry, 0) 'launch assembly program into a seperate COG, this cog loads a copy of the MODIFIED AddressOfCtrAsmMainMem long 0.
  
  DAT 'remember this DAT is in MAIN mem, it is copied to the new cog by "cognew(@asm_entry, 0)"
  ·AddressOfCtrAsmMainMem long 0· 'SPIN code "AddressOfCtrAsmMainMem := @CtrAsmMainMem" overwrites the 0 with @CtrAsmMainMem
  
  Thus there are 2 places labled "AsmMainMem", the become seperate and independant,
  1st, The SPIN code refers to the MAIN memory for AsmMainMem in the DAT area
  2nd, The ASM· code refers to its COG· memory for AsmMainMem, that was copied from the DAT area with COGNEW.
  
  Since all SPIN code uses main mem there is no problem exchanging PUB variables between SPIN programs,
  BUT all ASM·cogs need to·use WRLONG and RDLONG to exchange data with each other or SPIN code via MAIN memory.
  
  NOW this ASM code works ,·"WRLONG· AsmCounterLong,AddressOfCtrAsmMainMem 'hub instruction to send data to main memory for spin pgm to display".
  
  Phillip Y.

  spin

  spin

  vga_text_demo_PY_mpg7spin.spin

  7K

  vga_text_demo_PY_mpg7spin.spin 6.7K