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How to embed data into ROM on PIC18F - equivalent of DB

 
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webbone



Joined: 20 Sep 2004
Posts: 14
Location: Sacramento, CA

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How to embed data into ROM on PIC18F - equivalent of DB
PostPosted: Wed Dec 07, 2005 6:01 pm     Reply with quote
If I am using MPASM I can do the following:

Code:
MyLabel:
  data  "some text",0xFF,0xAA
MyOtherLabel:
  DB    'A','B','X',0x55,'Z',0x00


This will store the appropriate data into ROM and then the address of MyLabel can be used to access the data.

The CCS compiler offers the label_address() function, but does not support either the data or DB directives in an #ASM block.

Is there another way to achieve the same thing? It would be most helpful if this could be achieved as shown above - the data being placed into ROM is configuration data for another device and will be moved to the device using an Assembly routine.

Any and all suggestions would be useful, even if it is just to state that this is impossible with the CCS tools.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Dec 07, 2005 6:14 pm     Reply with quote
http://www.ccsinfo.com/forum/viewtopic.php?t=22070&highlight=rom+const
asmallri



Joined: 12 Aug 2004
Posts: 1634
Location: Perth, Australia

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PostPosted: Wed Dec 07, 2005 6:50 pm     Reply with quote
Here's another way

Code:

#define Table 0x0C80   // specify where in program memory we want the table
#rom Table = {0x8C01,0x01EF,0x0023,0x0000,0x0000}

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