Host Node Configuration

• Write FLEX_US_CR.TXEN and FLEX_US_CR.RXEN to enable both the transmitter and the receiver.
• Write FLEX_US_MR.USART_MODE to select the LIN mode and the host node configuration.
• Write FLEX_US_BRGR.CD and FLEX_US_BRGR.FP to configure the baud rate.
• Write NACT, PARDIS, CHKDIS, CHKTYPE, DLCM, FSDIS and DLC in FLEX_US_LINMR to configure the frame transfer.
• Check that FLEX_US_CSR. TXRDY is set to 1.
• Write FLEX_US_LINIR.IDCHR to send the header.

What comes next depends on the NACT configuration:

• Case 1: NACT = PUBLISH, the USART sends the response.
  • Wait until FLEX_US_CSR. TXRDY rises.
  • Write FLEX_US_THR.TCHR to send a byte.
  • If all the data have not been written, repeat the two previous steps.
  • Wait until FLEX_US_CSR.LINTC rises.
  • Check the LIN errors.
• Case 2: NACT = SUBSCRIBE, the USART receives the response.
  • Wait until FLEX_US_CSR.RXRDY rises.
  • Read FLEX_US_RHR.RCHR.
  • If all the data have not been read, repeat the two previous steps.
  • Wait until FLEX_US_CSR.LINTC rises.
  • Check the LIN errors.
• Case 3: NACT = IGNORE, the USART is not concerned by the response.
  • Wait until FLEX_US_CSR.LINTC rises.
  • Check the LIN errors.