[riot-users] Stm32f4 Discovery Shell UART not working

Joachim hjbathb at yahoo.de
Thu Oct 30 18:29:05 CET 2014

Hello Peter and Ludwig,

thanks for the quick reply and the "welcome".

I checked everything again and build the "shell" appl. as described by Peter below. It doesn't work.

I'm using Linux MINT 17 as a virtual machine with Virtualbox.

=== The compiler I use (from ppa:terry.guo/gcc-arm-embedded)
joachim at Mint-VirtualBox ~/Projekt/RIOT-master/tests/shell $ arm-none-eabi-gcc --version
arm-none-eabi-gcc (GNU Tools for ARM Embedded Processors) 4.8.4 20140725 (release)
[ARM/embedded-4_8-branch revision 213147]
Copyright (C) 2013 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO

=== The terminal output after reset of the discovery board:
kernel_init(): This is RIOT! (Version: UNKNOWN (builddir: /home/joachim/Projekt/RIOT-master))
kernel_init(): jumping into first task...
UART0 thread started.
uart0_init() [OK]

I have exchanged my RS232 level shifter. The same result. In case I shortcut tx/rx on my level
shifter, I can see the keyboard hits on my terminal.

The only idea I have, my discovery is dead on that RX-pin for UART-0. But honestly, I don't believe
that. I guess there is something else. Do you have a quick hint to enable a debug print, if the RX
IRQ is running? Or may be you have another idea?

@Ludwig: At the moment there is no special project. First I like to "play" a bit with RIOT-OS. I
ordered two "MRF24J40MA", a Microchip development board (should be compatible with CC2420),
yesterday. I want to transfer data between two STM32F4 discovery (with MRF24J40MA connected).
In case that is working, may be I want to buy more HW and build a wireless sensor network. I'm also
interesting in routing and "self healing" networks. I'm very new to 6loWPAN and RPL but as I
understood, that is possible!??
I have used TinyOS in the past for one project in my job. Nobody has experience with wireless sensor
networks in my company and they choose TinyOS. I prefer RIOT-OS in case that is working. :)
Further I like the XMC2Go (Infinion) to run RIOT-OS. I know you start something for a port. ;)

Thank you very much.


Am 30.10.2014 um 16:33 schrieb Peter Kietzmann:
> Am 30.10.2014 um 16:16 schrieb Ludwig Ortmann:
>> Hi Joachim,
>> On Thu, Oct 30, 2014 at 04:07:00PM +0100, Joachim wrote:
>>> my first posting :)
>> Welcome =)
> Welcome also from my part :-) ,
>> Do you have any particular project you want to use RIOT in?
>>> On my Stm32f4 Discovery it starts, I can see the startup messages after Reset. But it seems, that inputs from the Terminal are not working. There is no reaction on it.
>>> I found on gitgub a posting from Hauke. He had the same problem but later not and I do not why.
>>> May be Hauke or another one has a hint for me? I checked already my HW, it seems to be ok.
>> Might be something to do with your compiler - did you check the wiki?
> Maybe you just did not connect your tty/USB adapter correctly? If you 
> compare [1] you can see the predefined pin mapping is: PA2 = UART_0_TX 
> and PA3 = UART_0_RX. Also [2] may be of interest for getting started.
> I compiled the shell example (in RIOT/tests/shell) with gcc-arm-embedded 
> and connected my adapter like described above. Then I used the pyterm 
> tool (in RIOT/dist/tools/pyterm) and terminal IOs were working correctly.
>> Cheers, Ludwig
> Cheers,
> Peter
> [1] https://github.com/RIOT-OS/RIOT/wiki/Board:-STM32F4discovery
> [2] 
> https://github.com/RIOT-OS/RIOT/wiki/Getting-started-with-STM32F%5B0|3|4%5Ddiscovery-boards
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