DAT declaration

DarrenY

I have a simple problem that's driving me mad as I can't get it to work!

In my main module I (want to) declare a DAT block of bytes, that I get the address of via F8

I then use this address within a 'MemoryMap.spin' file:

CON BaseAddr = $54 ' Base Memory location - should be address of DataBlock in main module

CON
   Var1      = 0                
   Var2      = 4                   
   Var3      = 8                        
   Var4      = 12      
   ...
   LastVar = 192          

I then include the MemoryMap.spin object in all the spin files that need to access the memory block.
The main files memory block can then be read/written from any module using the following:

  readvar1 := long[noparse][[/noparse]constant(memmap#BaseAddr + memmap#Var1)]
  long[noparse][[/noparse]memmap#BaseAddr + memmap#Var2] := writevar2

(where memmap is OBJ memmap : "MemoryMap")


Trouble is, I am having trouble getting the main module to declare an array of bytes in the DAT block:

DAT
   DataBlock byte memmap#LastVar ' this is the last (i.e. size of) var in the global memory map

Is this the correct syntax?


Cheers all.

Mike Green

The syntax you used simply declares one byte whose value is that of memmap#LastVar. There's no documented provision for declaring arrays of data in a DAT section. I seem to remember a previous post mentioning an undocumented feature that you could try:

DAT
DataBlock byte 0[noparse][[/noparse] memmap#LastVar ]

Someone else may remember more about this than I can.

DarrenY

worked first time! Thanks!!

I'd be interested to hear exactly what it's doing though.......

Fred Hawkins

Mike Green said...
The syntax you used simply declares one byte whose value is that of memmap#LastVar. There's no documented provision for declaring arrays of data in a DAT section. I seem to remember a previous post mentioning an undocumented feature that you could try:

DAT
DataBlock byte 0[noparse][[/noparse] memmap#LastVar ]

Someone else may remember more about this than I can.

is this it? http://forums.parallax.com/showthread.php?p=659730

also this example: http://forums.parallax.com/showthread.php?p=586819

finally, about aliasing: http://forums.parallax.com/showthread.php?p=659730

I am starting to think we need manual 1.02

Post Edited (Fred Hawkins) : 9/17/2007 3:14:20 PM GMT

deSilva

It is well described in the Supplement/Errata
www.parallax.com/dl/docs/prod/prop/PMv1.0Supplement-v1.1.pdf