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]

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

[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.