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Basics: C programming for ARM - AHB transfers

joewu joewu
Note: This was originally posted on 18th September 2007 at http://forums.arm.com

Hello,
Would someone please help me about the next basic things?
I have programed microcontrollers in the past but now I need to work with ARM processors and need some basic pieces to connect the puzzle.
I wil write a C/C++ code for ARM966 but I don't know what to do in the code to communicate to an AHB peripheral. It should be memory mapped but I don't know at what location and if I need to do the memory initalisation at the start of the code or I can read it from somewhere - I have not been able so far to find a clear document about that.
Also, I expect that is enough for me to write to that location in the memory and to read from it and the compiler 'armcc' will take care of generating AHB transaction data that will go to ARM AHB interface ports. I am right or there are specific C functions for AHB transfers in both directions?
I expect to have a library of the C functions that I can use in the code but also somehow I couldn't find the place where it is explained.
I have been digging over RealView 3.0 (Unix) directories in the search for that and I see several header files (like rt_heap.h, rt_memory.h and so on) but I don't have any single C project example where I can see their usage.
I would really apreciate if someone can give me some examples or point me to a location where I can read about that.
The same questions go for the tightly coupled memory (TCM) - where is it in the memory map and so on.
Any help is appreciated.
Thank you very much,
joewu
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    Note: This was originally posted on 18th September 2007 at http://forums.arm.com

    Thank you very much for the answer.
    Again I am continuing with the basics: where to find what AHB peripheral is mapped at what location in the memory so I can assign a value to a pointer and know I talk to that peripheral?
    Do you maybe have a little C example for AHB read/write to demonstrate this?
    The same goes for TCM.
    I am looking now at the ARM966E-S Tech. Ref. and it says on page 3-2 that one memory region for AHB unbuffered access is from 0x1000 0000 to 0x1fff ffff. I have a DRAM controller with AHB interface that should be connected to AHB interface of this processor. What to do here, maybe we can take this and make an example?
    Is there a document that describes this, I mean basic setup steps and an example of the AHB communication, it should be pretty short?
    Thank you very much,
    joewu
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  • 0
    Note: This was originally posted on 18th September 2007 at http://forums.arm.com

    Thank you very much for the answer.
    Again I am continuing with the basics: where to find what AHB peripheral is mapped at what location in the memory so I can assign a value to a pointer and know I talk to that peripheral?
    Do you maybe have a little C example for AHB read/write to demonstrate this?
    The same goes for TCM.
    I am looking now at the ARM966E-S Tech. Ref. and it says on page 3-2 that one memory region for AHB unbuffered access is from 0x1000 0000 to 0x1fff ffff. I have a DRAM controller with AHB interface that should be connected to AHB interface of this processor. What to do here, maybe we can take this and make an example?
    Is there a document that describes this, I mean basic setup steps and an example of the AHB communication, it should be pretty short?
    Thank you very much,
    joewu
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