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Hi all, I'm asking if anyone has found a better way to access user defined memory. That is, accessing memory that can't be reached w/the "movx" instruction, but must be accessed w/user code. I can get it done w/Far memory but don't want to buy the PDK. I finally found that I can use good old C51.exe & BL51.exe and generic pointers to get the job done. I can divide XDATA space into "standard" RAM and user defined RAM by writing my own ?C?CSTPTR & ?C?CLDPTR routines (these library routines resolve generic pointers at run time). This can get tedious (using pointers when I normally didn't have to) but it works. My main problem is that I have to be careful to use or store parameters passed between functions (via registers) right away or the compiler will store them in XDATA w/MOVX - which can cause trouble depending on the address. Anyway, if I'm careful this works. And, I don't see any other way to do this aside from buying the PDK. Has anyone else ever done this another way? Thanks for your time. Bill
"Being a hardware guy, I often don't understand the things that get you SW types' knickers all twisted up." Maybe an analogy would help? As a hardware guy, I'm sure you appreciate the value of a good 'scope. Your scheme is a bit like saying, "I really need a dual-trace scope, but I've got this trusty single-trace job, and don't want to pay out for a new one - so I'll just build myself a chopper to make it look like a dual trace..." Of course, you could do it; and it probably would be a useful learning experience, but it's hardly the way to run a business in this day & age, is it? "I've hacked many a compiler in my day, and am a little stunned that this practice is apparently very frowned upon these days." And maybe, in the Good Old Days, you did have to build your own chopper to get a dual-trace scope, and wind all your own transformers, etc, etc, ...
"I've hacked many a compiler in my day, and am a little stunned that this practice is apparently very frowned upon these days." Please provide a link to your code so I can hack it. Since you believe that code should be free to hack, please make yours available. Thanks Erik
So - writing your own library routines (as recommended by Keil in their own documentation) is illegal or immoral? That cracks me up! Very funny. As far as the scope analogy - I don't even need a voltmeter to get this job done! I think you folks must not understand how simple this is - and it is already done!! I just thought I'd poll the great minds here for better ideas. My mistake! I give. You win. It is wrong to buy a sling shot and make it better to kill a fox if the same company can sell me an elephant gun. Sheesh.
I just thought I'd poll the great minds here for better ideas. you included the better idea in your first post: I can get it done w/Far memory Erik
please.... That's the best you can do? Why not point out the part of my user's agreement that says I can't write my own library routines? What, you can't find it? I now promise to give you the last word. Unless, of course, I have to apologize when you've shown me that what I've done is wrong.