specifies the flag to check. @arg CEC_FLAG_TXACKE: Tx Missing acknowledge Error @arg CEC_FLAG_TXERR: Tx Error. @arg CEC_FLAG_TXUDR: Tx-Buffer Underrun. @arg CEC_FLAG_TXEND: End of transmission (successful transmission of the last byte). @arg CEC_FLAG_TXBR: Tx-Byte Request. @arg CEC_FLAG_ARBLST: Arbitration Lost @arg CEC_FLAG_RXACKE: Rx-Missing Acknowledge @arg CEC_FLAG_LBPE: Rx Long period Error @arg CEC_FLAG_SBPE: Rx Short period Error @arg CEC_FLAG_BRE: Rx Bit Rising Error @arg CEC_FLAG_RXOVR: Rx Overrun. @arg CEC_FLAG_RXEND: End Of Reception. @arg CEC_FLAG_RXBR: Rx-Byte Received.