Re: [Paparazzi-devel] ARM Cortex-M4

[Hector Garcia de Marina]

Hello Piotr,

already I am using g++ 4.6.1 (built with summon-arm-toolchain script, https://github.com/esden/summon-arm-toolchain). Employing FreeRTOS and Eigen for matrices.

I agree with you, inspecting the asm code for my IIR filter, I found that currently the compiler is not so "smart", actually sometimes it does not use the MAC instructions (DSP). I guess it is a matter of time that "cortex-m4" option will use better this kind of instructions. On the other hand, all float operation units uses correctly the new hardware instructions.

Héctor.

On Fri, Oct 14, 2011 at 10:03 AM, Piotr Esden-Tempski <address@hidden> wrote:

Hi,

On Oct 14, 2011, at 12:34 AM, Prof. Dr.-Ing. Heinrich Warmers wrote:

> Hi all,
> i found a first prototype pcb with the new ARM Cortex-M4.
> http://www.watterott.com/de/Boards-/-Kits/ARM/Cortex-M4
> This processor has a FPU,  168MHz clock, 1Mbyte flash eprom and 198kyte ram.
> The price is 14 euro.
> I think this processor allow DGPS and IMU fusion and may bee a candidate for the future  autopilot hardware.

I have this board on my desk. You can get them for free from ST if you are in the US. As I am working on lisa/m v1.1 l added forward compatibility to this chip.

The problem I see here is that the toolchains are in very early stages in supporting this new core, so it will take a while until they are stable enough to be used on production systems. But I am looking forward to that.

Cheers Esden

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--
Héctor