51822 TWI ERROR

[zcmm]

I use 51822 HW TWI to become master.when i send the first byte(Address+write or read bit) to sensor,the event TWI-ERROR is set.Who can tell me, what is the cause of this event？

[MartinBL]

Hi.

Which nRF51 IC revision do you use? Refer to the Compatibility Matrix.

Which SDK and driver are you using?

If you use one of the drivers in the SDKs I believe you should be able to find a description of what the error is about. E.g.

NRF_TWI_ERROR_ADDRESS_NACK = TWI_ERRORSRC_ANACK_Msk,    /**< NACK received after sending the address. */
NRF_TWI_ERROR_OVERRUN_NACK = TWI_ERRORSRC_OVERRUN_Msk,  /**< Byte received in RXD register before read of the last received byte (data loss). */
NRF_TWI_ERROR_DATA_NACK    = TWI_ERRORSRC_DNACK_Msk,    /**< NACK received after sending a data byte. */

Here you can find an TWI example based on the drivers in SDK 9.0.0.