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Re: [Paparazzi-devel] olimex stm32f405 bootloader strange behaviour

From: Sergey Krukowski
Subject: Re: [Paparazzi-devel] olimex stm32f405 bootloader strange behaviour
Date: Tue, 04 Nov 2014 19:45:48 +0100
User-agent: Opera Mail/11.61 (Win32)

Actually during bootloader startup some defined inputs has to be hold either hight or low. Otherwise the bootloader think there is a signal on other input (not USB) and starts in non USB mode. Looks like your GPS send some data on bootloaders input during startup and it tries to start in UART mode. It's not bad, just bootloaders feature.

Best regards,

I came across a strange problem while experimenting with the olimex stm32f405 board. When nothing is connected to the board everything works fine and the dfu-util uploads the code. As soon as i try to upload the code but with the gps connected (obviously powered from the usb +5v) dfu-util cannot find the bootloader and more importand the dmesg command shows that the usb device cannot be enumerated. Now either the gps (ublox NEO7) with active antenna and superb sensitivity is jamming the usb signals via
the usb power line or something else is happening.
I will try with another gps also but i thought that maybe someone has encountered this behaviour also. The discovery board does not have this problem with the same gps but i will test it again just to be sure as i haven't seen anything like this before (i also changed the gps uart in the airframe file and it still does it)

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