Adding twi support to ble_app_hrs_freertos

[eyalasko]

Hi,

I read so many articles but just can't find the correct way to add twi support to the ble_app_hrs_feertos app in the latest SDK15.

This what did:

- Copied 3 lines from twi_sensor example that define nrf_drv_twi_t object  just before my main (see screen cap)

- In sdk_config.h enabled NRFX_TWI_ENABLED & NRFX_TWI0_ENABLED

- Tried enabling nRF_Drivers\nrf_twi / nrf_drv_twi (whats the difference between the two?) in Keil's RTE manager

Nothing could get rid from the NRF_DRV_TWI_INSTANCE_0 undefined error.

Is there any guide how to integrate and use nrf drivers in general and twi in particular?  Specifically what to include and how (sdk_config.h? RTE ? both ?)

Thanks

[eyalasko]

Hi Nordic,

I did some further research and need your assistance in figuring out this Mystery ....

recap - I'm trying to implement twi support on freertos ble project (SDK15.0) the following way -

- My target project is a copy of ble_app_hrs_freertos folder

- My reference project is twi_sensor

- Added nrfx_twi.c & nrfx_twim.c to the nRF_Drivers group of the target project (imported from <SDK_folder>\modules\nrfx\drivers\src as in the reference project)

- Included the following at the beginning of main.c:

#include <nrfx.h>

#include "sdk_config.h"

#include "nrf_drv_twi.h"

- In sdk_config.h I've enabled NRFX_TWI_ENABLED & NRFX_TWIM_ENABLED and their immediate child NRFX_TWI0_ENABLED & ERFX_TWIM0_ENABLED

- in my main.c just before main() I've copied two lines from the reference project:

/* TWI instance ID. */
#define TWI_INSTANCE_ID 0
/* TWI instance. */
static const nrf_drv_twi_t m_twi = NRF_DRV_TWI_INSTANCE(TWI_INSTANCE_ID)

Mysteriously I keep getting "NRF_DRV_TWI_INSTANCE_0 undefined" error and noticed that although I've enabled TWI & TWIM in sdk_config.h they remained undef'd when looking in nrfx_twi.c & nrfx_twim.c (code grayed out). See screen capture

What make it even stranger is that in the reference project, again, both NRF_TWI_ENABLED & NRF_TWIM_ENABLED are set to 1 in sdk_config.h, but this time nrfx_twim.c become enabled while nerfx_twi.c remains grayed out...

I tried to follow the definition route and everything looks OK so I'm pretty lost here......

Thanks in advance for any support

[eyalasko]

In SDK14.2 it works fine !

- Included  #include "nrf_drv_twi.h"

- added nrf_drv_twi.c from <SDK142 folder>\components\drivers_nrf\twi_master to nRF_Drivers group

- In sdk_config.h enabled TWI_ENABLE & TWI0_ENABLED

- Add twi init code

Voilla, compiles without errors

[Túlio]

Problem solved!

Hello, eyalasko, I had the same problem, and I did exactly what you did.
I followed the NRFX_TWI0_ENABLED of the line #if NRFX_CHECK(NRFX_TWI0_ENABLED)

and it got me to this kind of transition file name apply_old_config.h and at this file NRFX_TWI0_ENABLED and NRFX_TWI_ENABLED appear as a combination of TWI0_ENABLED and TWI_ENABLED and so on, as you can see in the image below. 

So I basically did the same sdk_config.h as you and also enabled TWI0_ENABLED and TWI_ENABLED  and it worked like that!

Hope it also solves your issue ;) !

[Adib]

I think there is an error in this file apply_old_config.h

it is:

#if defined(TWI_ENABLED)

#undef NRFX_TWI_ENABLED
#define NRFX_TWI_ENABLED   (TWI_ENABLED && (NRFX_TWI0_ENABLED  || NRFX_TWI1_ENABLED))

but in sdk_config.h is

#define TWI_ENABLED 0

which actually DEFINES but does not ENABLES the preprocessor defines TWI_ENABLED

Correct should be:

#if TWI_ENABLED

#undef NRFX_TWI_ENABLED
#define NRFX_TWI_ENABLED   (TWI_ENABLED && (NRFX_TWI0_ENABLED  || NRFX_TWI1_ENABLED))

And so there comes this misunderstanding. ....

I hope this will be fixed.

Regards, Adib.