nRF52832, 2 SPI Bus usage

[enkavak]

Hello,

        I want to use 2 SPI bus with nRF52832 IC and SDK5. I can use the "SPI example" for first SPI bus. For the second SPI Bus, I think that I need to modify "sdk_config.h" file.

        How should I modify the "sdk_config.h" file ?

       Are the settings below enough ?

#define NRFX_SPIM_ENABLED 1
#define NRFX_SPIM0_ENABLED 1
#define NRFX_SPIM1_ENABLED 1


#define NRFX_SPI_ENABLED 1
#define NRFX_SPI0_ENABLED 1
#define NRFX_SPI1_ENABLED 1

[Edvin]

Hello,

That seems like a good start. I would suggest that you set #define SPI1_ENABLED 1 as well, if you use the SDK example. You will see why if you open the file apply_old_config.h, or just do a search for NRFX_SPI_ENABLED in your entire project, you will find how the apply_old_config.h file is implemented.

Then I suppose you need to initialize the second SPI just like it is done with the first in main.c.

 

Best regards,

Edvin

[enkavak]

What do you mean by "apply_old_config.h". Do I need to modify that file ?

[Edvin]

Sorry if I wasn't clear.

Let us take the SPI_ENABLED and NRFX_SPI_ENABLED as an example:

in apply_old_config.h, there is a section saying:

 

#if defined(SPI_ENABLED)
#undef NRFX_SPI_ENABLED
#define NRFX_SPI_ENABLED (SPI_ENABLED && (NRFX_SPI0_ENABLED || NRFX_SPI1_ENABLED || NRFX_SPI2_ENABLED) )

 

Let us say for simplicity that NRFX_SPI0_ENABLED is 1, so we can forget everything after "&&". So if you have defined both SPI_ENABLED and NRFX_SPI_ENABLED  in sdk_config.h, then NRFX_SPI_ENABLED will always be the same as SPI_ENABLED, but if you remove (remove, and not only define to 0), all the SPI settings from sdk_config.h will be replaced by the non-nrfx defines of the SPI.

 

NRFX_SPI_ENABLED defined in sdk_config.h:                     SPI_ENABLED defined in sdk_config.h:                  effective NRFX_SPI_ENABLED definition:

1..............................................................................................1.................................................................................................1            ok

1...............................................................................................0.................................................................................................0           changed

0...............................................................................................1.................................................................................................1           changed

0...............................................................................................0..................................................................................................0          ok

1...............................................................................................not defined..................................................................................1          ok

0...............................................................................................not defined..................................................................................0         ok

 

So either give them the same values, or completely remove the definition of the non-NRFX defines in sdk_config.h.

 

I would be careful with changing the apply_old_config.h file. You may do this of course, but be aware that it will affect all the other projects in the SDK as well.

 

Best regards,

Edvin

 

Best regards,

Edvin