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Basics: C programming for ARM - AHB transfers

joewu joewu
Offline over 6 years ago
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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  • 0 Offline over 6 years ago
    Note: This was originally posted on 20th September 2007 at http://forums.arm.com

    Thank you very much again.
    The actual situation is that I need to prepare a draft program version assuming that at some address in the memory there will be later attached an AMBA peripheral (a DRAM controller). I don't have a specific SoC, just know that ARM966E-S will be used to build that SoC. Since I have not worked practically yet with the AMBA bus (coming to that, obviously :rolleyes:) I am trying to model the situation because I must proceed without waiting for anyone around to finish ther job so I can start mine.
    Best regards.
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  • 0 Offline over 6 years ago
    Note: This was originally posted on 20th September 2007 at http://forums.arm.com

    Thank you very much again.
    The actual situation is that I need to prepare a draft program version assuming that at some address in the memory there will be later attached an AMBA peripheral (a DRAM controller). I don't have a specific SoC, just know that ARM966E-S will be used to build that SoC. Since I have not worked practically yet with the AMBA bus (coming to that, obviously :rolleyes:) I am trying to model the situation because I must proceed without waiting for anyone around to finish ther job so I can start mine.
    Best regards.
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