如何在STM32 F4XX上使用HW FPU？

如果使用FrRetos构建，是否有效？



     以下为原文
  Does it work if you use FreeRTOS build?

我会给FreeRTOS一个镜头，虽然我不会改变这个当前项目的基础OS。所以，我很想找到一个THEXX的解决方案。
ExtLogic中的家伙向我保证TxthTrimefPuiFuffic函数应该存在于TyReX的V5.6中。我只需要皮质X4版本的TXXPORT.H，并可能重建包含该函数的库存档（防止优化输出）。



     以下为原文
  I'll give FreeRTOS a shot, although I won't be changing underlying OS's for this current project, at this point. So, I would really like to find a solution for ThreadX.
 
The guys at ExpressLogic assured me that the tx_thread_fpu_enable function should exist in v5.6 of ThreadX. I just need the Cortex M4 version of tx_port.h and possibly a rebuild of the library archive with that function included (prevent optimization out).

MIFO^ ^ ^（虽然整个团队可能正在为深圳事件做好准备？）



     以下为原文
  mifo  ^^^ (although the whole team is probably gearing up for the Shenzen event right now?)

你好，USER 108962410
现在，Westice中提供的5.2个THEXX版本不支持FPU，正如您所提到的。你能告诉我们为什么你的申请需要一个FPU，这样我们就可以试着暂时提供一个替代方案吗？



     以下为原文
  Hello user_108962310
 
Right now the 5.2 version of ThreadX provided in WICED does not support the FPU as you mentioned. Could you please let us know that why your application requires an FPU so that we can try providing an alternative for the time being?

我并不严格要求FPU工作。当我们做了部分选择时，我们最终得到了一个微芯片，它有一个FPU，所以我们希望得到工作，如果我们已经支付它，它已经在设备中。
没有一个杀手的要求，但几个较小的：-我们正在做一些转换使用ExpF和缩放，并在浮动格式输出钳位，它出来到大约5000个周期。但这只在1Hz下完成。
一个相当数量的数学围绕LED衰落，在50fps。我已经通过使用所有的Q16整数操作来实现这一点，但是它是一个很好的跟踪，以人为地提升动态范围，即使如此，动态范围仍然是有限的。这将是很好的能够做到这一切都与轻松浮动从一开始…
-一些滤波（移动窗口，IIR），再次在Q8中实现，以提高动态范围。-使用Q15、Q31和浮点中可用的一些先进的CMIS-DSP功能；Q15和Q31已被评估，但我也想尝试浮动库。
闪光灯的大小，我们接近我们的片上闪光灯大小，测试表明，输出是一对夫妇的KB更小，如果所有的IEEE功能可以放弃有利于FPU指令。
这些都是问题的解决方案已经开发和航运。但是，TBH，必须做的所有关于现代高特征32位微型的解决方案是一种失望，它为我的NRE的上升。



     以下为原文
  I don't strictly "need" the FPU working. When we did part selection, we ended up with a micro that had an FPU anyway, so we'd like to get working if we're already paying for it and it's already in the device.
 
No one killer requirement, but several smaller ones:
- We are doing some transforms using expf and scaling, and with output clamping in float format, it comes out to around 5,000 cycles. But this is only done at 1hz.
- A fair amount of math around LED fading, at 50fps. I've made one pass at implementing this using all q16 integer operations, but it's *a lot* to keep track of to artificially boost the dynamic range, which even then is still limited. It would have been nice to be able to just do it all with easy floats from the beginning ...
- Some filtering (moving window, IIR), again implemented in q8.8 to boost the dynamic range.
- Using some advanced CMSIS-DSP functions which are available in q15, q31, and float ; q15 and q31 have been evaluated, but I'd like to try the float library, too.
- Flash size; we are nearing our on-chip flash size, and tests have suggested that the output is a couple of KB smaller if all the IEEE functions can be dropped in favor of FPU instructions.

Those are all issues where the workarounds are already developed and shipping.
But, tbh, having to do all of said workarounds on a modern high-feature 32bit micro is kind of a let-down and it ups the NRE's for me.

我们理解你提到的要点。我将提出一个内部请求，以便在TyReX库的下一个版本（5.8）中启用FPU支持。



     以下为原文
  We understand the point that you are mentioning. I will put forward an internal request to enable the FPU support in the next version (5.8) of  ThreadX library.

是否有一个ETA在THEXX 5.8纳入SDK版本？
我即将开始构建一个特性，它将是更好地使用F32而不是Q31，以及在FFT操作中处理精度损失的所有缓解措施。



     以下为原文
  Is there an ETA on the ThreadX 5.8 incorporation into an SDK release?
 
I am about to start building out a feature for which it would be *way* better to use f32 throughout, rather than q31 and all the mitigation for dealing with the loss of precision in FFT operations

Raktim Roy写道：
我们理解你提到的要点。我将提出一个内部请求，以便在TyReX库的下一个版本（5.8）中启用FPU支持。
罗伊
你能确认SDK-61（THEXEXV5.8）是否支持FPU支持？
嫦娥没有提到这一点。



     以下为原文
  

Raktim Roy wrote:
 
We understand the point that you are mentioning. I will put forward an internal request to enable the FPU support in the next version (5.8) of  ThreadX library.

rroy
 
Can you confirm if sdk-6.1 (with ThreadXv5.8) have FPU support enabled or not?
The changelog does not mention about that.

THEXX 5.8没有在SDK 6.1中启用的FPU支持。这仍然是一项尚未完成的工作。



     以下为原文
  ThreadX 5.8 does not have FPU support enabled in SDK 6.1. It's still a work in progress which has not yet been integrated.