Re: [Paparazzi-devel] STM32 and GPS receive

[Sergey Krukowski]

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