45.6.9.15.2 Client Node Configuration

  • Write TXEN and RXEN in US_CR to enable both the transmitter and the receiver
  • Write USART_MODE in US_MR to select the LIN mode and the Client node configuration
  • Write CD and FP in US_BRGR to configure the baud rate
  • Wait until LINID in US_CSR rises
  • Check LINISFE and LINPE errors
  • Read IDCHR in US_RHR
  • Write NACT, PARDIS, CHKDIS, CHKTYPE, DLCM and DLC in US_LINMR to configure the frame transfer
Important: If the NACT configuration for this frame is PUBLISH, the US_LINMR must be written with NACT = PUBLISH even if this field is already correctly configured, in order to set the TXREADY flag and the corresponding write transfer request.

What comes next depends on the NACT configuration:

  • Case 1: NACT = PUBLISH, the LIN controller sends the response
    • Wait until TXRDY in US_CSR rises
    • Write TCHR in US_THR to send a byte
    • If all the data have not been written, redo the two previous steps
    • Wait until LINTC in US_CSR rises
    • Check the LIN errors
  • Case 2: NACT = SUBSCRIBE, the USART receives the response
    • Wait until RXRDY in US_CSR rises
    • Read RCHR in US_RHR
    • If all the data have not been read, redo the two previous steps
    • Wait until LINTC in US_CSR rises
    • Check the LIN errors
  • Case 3: NACT = IGNORE, the USART is not concerned by the response
    • Wait until LINTC in US_CSR rises
    • Check the LIN errors
      Figure 45-48. Client Node Configuration, NACT = PUBLISH
      Figure 45-49. Client Node Configuration, NACT = SUBSCRIBE
      Figure 45-50. Client Node Configuration, NACT = IGNORE