Undefined symbol nrf_drv_twi_init (referred from main.o).

Question

Hello,
I am using pca10028 and sdk12.2. I am trying to take sensor reading via TWI and I want to send this reading over ble. So I am trying to add twi files in ble_app_template project.
After adding TWI file I am getting error such as : 
 L6218E: Undefined symbol nrf_drv_twi_enable (referred from main.o).
L6218E: Undefined symbol nrf_drv_twi_init (referred from main.o). 
 I have enabled #define TWI1_ENABLED 1 and #define TWI0_ENABLED 1 from sdk_config.h app.
I have also included paths like:
components\drivers_nrf	wi_master 
 My code is attached below: 
 main.c 
 New Text Document.txt 
 Thanks,
Shailav

Jørn · Accepted Answer

Hello shailav619 
 I have looked at your code. You can remove the line 
 #include "nrf_drv_twi.c"
 
 As it is not necessary. 
 Instead you need to add the nrf_drv_twi.c file to the project. You can find this file in the directory located at [SDK-Folder]/components/drivers_nrf/twi_master 
 If you are using Keil simply double click on the nRF_drivers folder in the left hand side folder-tree, and add the file through the window that opens. 
 Next go into sdk_config.h, and click on the configuration wizard tab. Here check the box next to TWI_ENABLED, and inside the TWI_ENABLED tree check the box next to TWI0_ENABLED. 
 If you're not using Keil you will need to make the corresponding changes in the sdk_config.h file manually by setting the TWI_ENABLED and TWI0_ENABLED to 1. 
 Best regards 
 Jørn Frøysa