使用 FreeRTOS 和 OpenOCD 配置 GCC
我很确定这是可能的，但我不知道如何去做。一般来说，我对使用 GCC 进行构建非常陌生，并且从未使用过 FreeRTOS，但我想尝试在 TI ARM Cortex MCU 上启动并运行该操作系统，但有一点小小的不同：我想得到它与 Pascal 一起启动并运行。我很好奇：
- 这样还能找到工作吗？如果不是，接下来的问题就没有实际意义了。
- 从我使用 Delphi 的时候起，我就隐约记得访问 C 库中的函数的能力。我想知道我是否可以访问 FreeRTOS 中的 C 例程。
- 如果我使用 GCC 版本（首选），我可以在目标上使用 OpenOCD 进行调试吗？我不太确定调试符号是如何工作的，以及它是否或多或少与语言无关（希望在这种情况下）。
- 作为有点超出原始查询范围的额外问题，我可以在 x86 处理器（例如我的开发 PC）上模拟 FreeRTOS 以便在开发过程中更轻松地进行调试吗？ （当然，使用 Pascal 程序..）
我还没有找到任何关于实现此目的的文档，所以希望这里有人可以阐明一些！任何资源都会非常有帮助。就像我说的，我对这种开发非常陌生。如果您认为有更好的选择，我也愿意接受建议。
仅供参考，我首选的主机配置类似于：
- Linux (Ubuntu/Debian)
- Eclipse IDE，用于开发、单元测试，并希望模拟/调试
- OpenOCD，用于
- 目标调试 GNU Pascal + FreeRTOS
I'm pretty sure this is possible but I'm not sure how to go about it. I'm very new to building with GCC in general and I have never used FreeRTOS, but I'd like to try getting the OS up and running on a TI ARM Cortex MCU but with a slight twist: I'd like to get it up and running with Pascal. I'm curious:
- Is this even possible to get work? If not, the next issues are kind of moot points.
- From my Delphi days, I vaguely recall the ability to access functions in C libraries. I'm wondering if I would have access to the C routines in FreeRTOS.
- If I use the GCC version (preferable) would I be able to debug using OpenOCD on the target? I'm not quite sure how debug symbols work and if it's more or less language agnostic (hopefully, in this case).
- As kind of a bonus question a bit outside the scope of the original query, can I simulate FreeRTOS on an x86 processor (e.g. my development PC) for easier debugging during development? (With a Pascal program, of course..)
I haven't found any documentation on achieving this, so hopefully someone here can shed some light! Any resources would be most helpful. Like I said, I'm very new to this kind of development. I'm also open to suggestions if you think there is a better alternative.
FYI, my preferred host configuration would be something similar to:
- Linux (Ubuntu/Debian)
- Eclipse IDE for development, unit testing, and hopefully simulation / debugging
- OpenOCD for target debugging
- GNU Pascal + FreeRTOS on target
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FreeRTOS 是 C 源代码，所以就像你说的，你必须有某种机制将 C 与你的 Pascal 程序链接起来。此外，FreeRTOS 依赖于某些寄存器来执行诸如将参数传递到任务等操作（作为一个假设的示例，任务可能始终期望参数位于寄存器 R0 中），因此您必须确保 C 编译器的 ABI Pascal 编译器是相同的 - 或者让你的任务输入 C 语言，然后让它调用 Pascal 函数（非常讨厌）。然后是中断、调用内联宏等问题。我想说这很难实现。
FreeRTOS is C source code, so like you say you would have to have some mechanism for linking C with your Pascal programs. Also, FreeRTOS relies on certain registers to be used for things like passing a parameter into a task (as a hypothetical example, the task might always expect the parameter to be in register R0) so you would have to ensure the ABI for the C compiler and the Pascal compiler was the same - or have your task entry in C then have it call a Pascal function (very nasty). Then there is the issue of interrupts, calling inline macros, etc. I would say this would be extremely difficult to achieve.
GNU Pascal 和 Free Pascal 都支持链接到 C (gcc) 和 ARM，以及从 C 等调用 pascal 代码。编写标头并使用 cdecl 声明原型就足够了。
宏是一个更大的问题。通常我只是将它们重写为内联函数（无论如何它们都应该是这样）。除了宏/头文件问题之外，问题更多的是编译器特定的功能（从一个 C 编译器移植到下一个时也会遇到问题）
如果您更喜欢 TP/Delphi 方言，Free Pascal 是更好的选择。
我在 sheevaplug 上运行我的旧 Delphi 代码很好。
Both GNU Pascal and Free Pascal support linking to C (gcc) and ARM, as well as calling pascal code from C etc. Writing a header and declaring the prototypes with cdecl is all there is to it.
Macros are a bit bigger problem. Usually I just rewrite them to inline functions (what they should have been anyway). Except for the macro/header issue, the problems are more compiler specific functionality (which you also would have a problem with when porting from one C compiler to the next)
If you prefer TP/Delphi dialect, Free Pascal is the better choice.
I run my old Delphi code fine on my sheevaplug.
TI Cortex-M3（以前是 Luminary Micro Cortex-M3）上已经有 FreeRTOS/GCC/OpenOCD 的示例。请注意，这是一个非常古老的示例，并且使用的 Eclipse 和 OpenOCD 版本都已过时。
尽管提供了 Eclipse 项目，但该项目被配置为标准 make（而不是托管 make）项目，因此有一个标准 makefile，可以像在 Eclipse 中一样轻松地从命令行执行。
http://www.freertos.org/portLM3Sxxxx_Eclipse.html
There is already an example for FreeRTOS/GCC/OpenOCD on a TI Cortex-M3 (was Luminary Micro Cortex-M3). Be aware though that this is a really old example and both the Eclipse and OpenOCD versions used are out of date.
Although there is an Eclipse project provided, the project is configured as a standard make (as opposed to a managed make) project, so there is a standard makefile that can be just as easily executed from the command line as from within Eclipse.
http://www.freertos.org/portLM3Sxxxx_Eclipse.html