[riot-users] SPI Initialization failure with mrf24j40 and stm32f0discovery

nils nils at firemail.cc
Tue Nov 27 13:50:52 CET 2018

Slight update on this,

After some more messing around today it ended up being incorrect 
connection of the CS pin,
this is by default connected to PA0, which is the user button. After 
pressing this button right after flashing the stm32 it goes through and 
inits correctly. I'm however not sure how I'd let the OS do this 
instead. Any ideas towards this would still be nice, seems a bit vague.

This is however a minor issue, since it at least works now. Keep up the 
great work.


On 11/27/18 1:31 AM, nils wrote:

> Hello,
> I'm trying to get the mrf24j40 radio working with  the
> stm32f0discovery, I've connected it correctly (to my understanding), 
> but SPI
> seems to fail to initialize.
> Currently the following code is used to test, with ENABLE_DEBUG set:
>     #include <stdio.h>
>     #include <mrf24j40.h>
>     #include <mrf24j40_params.h>
>     int main(void)
>     {
>         mrf24j40_t dev;
>         mrf24j40_setup(&dev, mrf24j40_params);
>         mrf24j40_reset(&dev);
>         return 0;
>     }
> This results in the following error from the mrf24j40_init function:
> [mrf24j40] Initialization failure, SPI interface communication failed
> The only USEMODULE I've selected in the makefile is mrf24j40
> My question here is what the best steps from here would be to find out 
> what
> could cause SPI to fail, I feel a bit overwhelmed with the possible 
> causes
> this could have and frankly have no idea what to check next. Is anything
> inherently wrong with my usage of the driver? Can I use the default 
> params
> from mrf24j40_params.h without issues? Are any issues known with the 
> stm32
> boards and this radio chip? Is the only possible problem here the way 
> I've
> connected it? Any specific pins not clear from the default params that 
> need to
> be connected to either GND or VCC?
> Any help or ideas would be greatly appreciated,
> thanks in advance
> Nils
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