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

[Prof. Dr.-Ing. Heinrich Warmers]

Hi Chris,
i have the olimex stm32f405 with apogee software  the running.
First you have to make  changes for the other  oscillator frequency the get the correct baud rate of the UARTs.
Without this changes the time base has an error of the factor 2.
The resonator frequency is 8 MHz. the apogee has an 16 MHz one.
in apogee_1.0.h EXT_CLK  8 000 000.
I add a  push button switch  which set 3.3V to right (in the layout)  pad of  R1  BOOT0  and the pad below R1  (3.3V).
By pressing the push button  the ollimex boot with the DFU-USB.
I made my test without a connection of the GPS-Module and used TX6 and RX6 for telemetry.
Also the paparazzi discovery software was running .


Regards
Heinrich





 

	push button switch

Chris schrieb:

Hi.
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)
Chris


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