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Re: [Paparazzi-devel] STM32 and GPS receive

From: Prof. Dr.-Ing. Heinrich Warmers
Subject: Re: [Paparazzi-devel] STM32 and GPS receive
Date: Sun, 18 Nov 2012 00:36:47 +0100
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; de-DE; rv:1.4) Gecko/20030619 Netscape/7.1 (ax)

i always use ferrite rings for GPS connections wires.
Also for the receivers and modems.
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.


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

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.

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