Absolute location of constant tables in code space

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Read-Only Author josh lifton Posted 13-Jan-2002 21:07 GMT Toolset C51	Absolute location of constant tables in code space josh lifton I'm looking for a way to absolutely locate a constant array in code space using the C51 compiler. I can use the 'code' memory location specifier to indicate the array should be located in program memory. For example: int code arrayOfPrimes[3] = {2, 3, 5}; I can also use the '_at_' specifier to locate an array at an absolute memory address. For example: int arrayOfPrimes[3] _at_ 0x80; arrayOfPrimes[0] = 2; arrayOfPrimes[1] = 3; arrayOfPrimes[2] = 5; However, I can't use both specifiers together in any meaningful way. This is because locating an array in code space requires that I initialize the array as I declare it (I can't change it in the program because it is in ROM). However, I can't initialize the array because the '_at_' specifier doesn't allow it for some reason. Thus: /* This won't work! / int code arrayOfPrimes[3] _at_ 0x80 = {2, 3, 5}; / This works but is meaningless because I can't initialize the array. */ int code arrayOfPrimes[3] _at_ 0x80; Any suggestions on how to get around this? Thanks, josh

Read-Only Author Andrew Neil Posted 13-Jan-2002 21:36 GMT Toolset C51	RE: Absolute location of constant tables in code space Andrew Neil Use the Search (look left) - this has been discussed many times before!

Read-Only Author josh lifton Posted 14-Jan-2002 04:54 GMT Toolset C51	RE: Absolute location of constant tables in code space josh lifton Hmm... I did try searching before hand, but didn't come up with anything. Another post points to how to do this using the linker. I saw this in the manual, but I was trying to avoid coding on the linker level. Thanks for the pointer. josh

Read-Only Author Andrew Neil Posted 14-Jan-2002 09:55 GMT Toolset C51	RE: Absolute location of constant tables in code space Andrew Neil Why do you need to avoid Linker options? The altetnative is to do it in Assembler.

Read-Only Author Jon Ward Posted 13-Jan-2002 22:18 GMT Toolset C51	RE: Absolute location of constant tables in code space Jon Ward Take a look at: http://www.keil.com/support/docs/130.htm Jon

Read-Only Author Andrew Neil Posted 14-Jan-2002 08:31 GMT Toolset C51	RE: Absolute location of constant tables in code space Andrew Neil Jon, I think you should include that one in your Top Ten Q&A http://www.keil.com/support/topten.asp

Read-Only Author Jon Ward Posted 14-Jan-2002 18:05 GMT Toolset C51	RE: Absolute location of constant tables in code space Jon Ward The top-ten list is updated every day. It is automatically generated based on which ones are used most frequently in a 3-month period to answer technical questions. Jon

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