Thank you for taking time to look at my problem!
I have managed to combine the TDK/Invensense library for their IMU MPU9250 within the SDK 15 utilizing simple TWI calls, but when attempting to utilize TWI manager the compiler errors:
C:\Nordic\nRF5_SDK_15.0.0\examples\peripheral\MPUmanagedTWI\pca10040\blank\armgcc>make
Linking target: _build/nrf52832_xxaa.out
_build/nrf52832_xxaa/tdk_ERmini.c.o: In function `ERmini_init':
C:\Nordic\nRF5_SDK_15.0.0\examples\peripheral\MPUmanagedTWI\pca10040\blank\armgcc/../../../tdk_ERmini.c:72: undefined reference to `nrf_twi_mngr_init'
_build/nrf52832_xxaa/tdk_ERmini.c.o: In function `mpu_i2c_write':
C:\Nordic\nRF5_SDK_15.0.0\examples\peripheral\MPUmanagedTWI\pca10040\blank\armgcc/../../../tdk_ERmini.c:112: undefined reference to `nrf_twi_mngr_schedule'
_build/nrf52832_xxaa/tdk_ERmini.c.o: In function `mpu_i2c_read':
C:\Nordic\nRF5_SDK_15.0.0\examples\peripheral\MPUmanagedTWI\pca10040\blank\armgcc/../../../tdk_ERmini.c:139: undefined reference to `nrf_twi_mngr_schedule'
collect2.exe: error: ld returned 1 exit status
The development is done through text editors and command line with make and gcc. I have the nrf_twi_mngr.h included in the tdk_ERmini.h file and the make file has the source and the include folder added.
I think I have attached the complete project.
