Re: [Paparazzi-devel] STM32 and GPS receive

[Prof. Dr.-Ing. Heinrich Warmers]

Hi,
i always use ferrite rings for GPS connections wires.
Also for the receivers and modems. 
http://paparazzi.enac.fr/wiki/File:RazzorIMU.jpg
If you have problems please try them first.
The LPC2148  use  low clocks  on pads (range 4 MHz). In  the ST 
processors the io clock  is 36 or 72 MHz ?
The autopilots with 4 layers (Tiny HBmini)  generate lower dissertation 
than such with 2 layer.
But also with the Twog and Umarin i had never problems with the GPS 5cm 
away from the autopilots..
By applying  aluminium foil below the GPS module  i got a  3dBbetter 
signal in my fun jet.
In the fun jet the GPS module fetch noise from the motor controller
The most problems i had with 35MHz and 40 MHz receivers and the old AVR 
autopilots.
Regards

Heinirch

Sergey Krukowski schrieb:

> I tried any possible power supply configurations to be sure that the  
> internal switching regulator does not affect this. And it is 
> absolutely  unambiguouslyfor me - the problem is in STM32F1.
> I've also tried LisaM with only a led test programm on it - same 
> result.  Ublox5 GPS receiver has noticeable worse receive nearby the 
> board.
>
> I found yet one forum topic about it
>
> https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=%2Fpublic%2FSTe2ecommunities%2Fmcu%2FLists%2Fcortex_mx_stm32%2FHSI%20and%20GPS%20interfence&FolderCTID=0x01200200770978C69A1141439FE559EB459D7580009C4E14902C3CDE46A77F0FFD06506F5B&currentviews=3 
>
>
> The solution could probably be to switch off the HSI after HSE and 
> PLL  init. As I see, the HSI is switched on in  
> rcc_clock_setup_in_hse_12mhz_out_72mhz function and stays on from 
> that  point.
> By adding rcc_osc_off(HSI) at the end of this function could probably 
> help.
> Regards,
> Sergey
>
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