Re: [Paparazzi-devel] New Autopilot hardware for 16 Euros

[Sergey Krukowski]

Hi guys!

Yes, F3 series is based on cm4 architecture, but there are some  
differencies from F1.
And first of all the clocking - STM32F4 produce much less noise in GPS  
band than STM32F1.
So it suit the UAV uses much better.

Regarding the STM board - it's probably pretty useful for study purposes,  
I've had an experience with the L3G gyro, it's much simpler than Invesense  
sensors, hovever I had a couple of successful autonomous flights with this  
sensor on my small Merlin on board.

I'm currently doing a port on my Krooz board with STM32F4 on it, there are  
currently peripheral, I2C, PPM working. ADC and SPI are under construction.
I've also done a first version of DFU bootloader for the STM32F4 and  
stm32_mem, however it's not 100% stable yet. But it works.
BTW, the native STM Flash Loader Demonstrator is also NOT 100% stable with  
this controller, so there could be some problems with the custom  
bootloader too.

It would also be nice to use the hardware FPU on STM32F4. However, as I  
understand, the libgcc libraries are currently compiled with use of soft  
float. Is it really so, or there is a directory with the VFP libraries  
under paparazzi?

Regards,
Sergey