NRF_DRV_TWI_INSTANCE error

Question

hi, 
 i test my project for i2c sensor module, the debug found have error what there are the following error tips. 
 ..\..\..\swct_application\i2c_sensor_driver.c(14): error: #20: identifier "NRF_DRV_TWI_INSTANCE_0" is undefined 
 please tell me set this macro definition where is it ? in sdk_config.h ? 
 and i have include nrf_drv_twi.c and #include "nrf_drv_twi.h" 
 my code : 
 /* TWI instance ID. */ #define TWI_INSTANCE_ID 0 /* Common addresses definition for temperature sensor. */ #define SENSOR_ADDR (0x78U >> 1) /* Indicates if operation on TWI has ended. */ static volatile bool m_xfer_done = false; /* TWI instance. */ static const nrf_drv_twi_t m_twi = NRF_DRV_TWI_INSTANCE(TWI_INSTANCE_ID);

lynn · Accepted Answer

i am using the SDK 15.0.0 ， using the i2c_sensor_driver.c, NRF_DRV_TWI_INSTANCE error problem has been resolved.but i found a question, as follows: 
 //twi: 
 m_xfer_done = false; err_code = nrf_drv_twi_tx(&m_twi, SENSOR_ADDR, reg, sizeof(reg), false); APP_ERROR_CHECK(err_code); while (m_xfer_done == false); 
 //spi: 
 KX123_spi_activate_cs();/*no delay*/ spi_xfer_done = false; APP_ERROR_CHECK(nrf_drv_spi_transfer(&kx123_spi_instance, tx_data, 2, NULL, 0)); while(!spi_xfer_done); KX123_spi_deactivate_cs(); 
 i also need to wait for complete flag every time? this way will cause system halted.

NRF_DRV_TWI_INSTANCE error

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