Re: [Paparazzi-devel] ARM Cortex-M4

[Hector Garcia de Marina]

I already have this prototype board (I bought it at mouser).

One interesting benchmarks employing FreeRTOS:

Cholesky factorization 7x7 float @100Hz:

STM32F103 ->  takes around 4% of the proccesor.

STM32F4 ->  less than 1%.

FIR / IIR filters with the new DSP instructions are really faster in STM32F4. Now an intensive

pre-processing raw values from sensors is possible with "no-delays". You can put a higher sample frequency and apply a 16th order Butterworth without low computational cost (useful when you have high freq vibration/noise for instance).

Héctor.

On Fri, Oct 14, 2011 at 9:34 AM, Prof. Dr.-Ing. Heinrich Warmers <address@hidden> 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.

Regards

Heinrich Warmers


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Héctor