undeclared identifier TWI0_USE_EASY_DMA error

[talha]

Hi,

I am trying to use the nrf_drv_twi class but I cannot define a nrf_drv_twi_t instance. When I write the code

`nrf_drv_twi_t twi = NRF_DRV_TWI_INSTANCE(0);

I get the error saying

error: use of undeclared identifier 'TWIO_USE_EASY_DMA'

I checked all my header files, and I have also added their path in Target/C, so I don't think there is issue there. I am using SDK version 11.

What could be causing this problem?

Edit: I tried to build the example project twi_master_using_app_twi and it builds without an error. However, when i write the following code in my project I get the error in question:

#include <stdio.h>
#include "boards.h"
#include "app_util_platform.h"
#include "nrf_drv_rtc.h"
#include "nrf_drv_clock.h"
#include "bsp.h"
#include "app_uart.h"
#include "app_error.h"
#include "app_timer.h"
#include "app_twi.h"

static app_twi_t m_app_twi = APP_TWI_INSTANCE(0);

[Ole Bauck]

TWI0_USE_EASY_DMA is defined in nrf_drv_config.h if TWI0_ENABLED is defined as '1'. Either you have not included nrf_drv_config.h (not likely as you should have had lots of other errors) or you have not enabled TWI0 with #define TWI0_ENABLED 1.

[talha]

Actually I neither included that file nor enabled the TWIO_ENABLED macro. Sorry I am very new at this. Thank you so much

[Levi]

I am having the same issue from above. I have included "nrf_drv_config.h" AND added #define TWI0_ENABLED 1, but I am seeing the same error when I build in Keil. Any idea how to fix this?

[Ole Bauck]

You have defined TWI0_ENABLED 1 in nrf_drv_config.h? You have to define it in this file or before this file is included or else TWI0_USE_EASY_DMA will not be defined:

#if (TWI0_ENABLED == 1)
#define TWI0_USE_EASY_DMA 0

[Levi]

I found the solution to my problem, shown here:

devzone.nordicsemi.com/.../