45.6.10.11.1 Sending A Frame

  1. Write TXEN and RXEN in US_CR to enable both the transmitter and the receiver.
  2. Write USART_MODE in US_MR to select the LON mode configuration.
  3. Write CD and FP in US_BRGR to configure the baud rate.
  4. Write COMMT, COLDET, TCOL, CDTAIL, RDMNBM and DMAM in US_LONMR to configure the LON operating mode.
  5. Write BETA2, BETA1TX, BETA1RX, PCYCLE, PSNB, NPS, IDTTX and ITDRX respectively in US_FIDI, US_LONB1TX, US_LONB1RX, US_TTGR, US_LONPRIO, US_LONIDTTX and US_LONIDTRX to set the LON network configuration.
  6. Write TX_PL in US_MAN to select the preamble pattern to use.
  7. Write LONPL and LONDL in US_LONPR and US_LONDL to set the frame transfer.
  8. Check that TXRDY in US_CSR is set to 1.
  9. Write US_LONL2HDR register to send the header.
  10. Wait until TXRDY in US_CSR rises.
  11. Write TCHR in US_THR to send a byte.
  12. If all the data have not been written, redo the two previous steps.
  13. Wait until LTXD in US_CSR rises.
  14. Check the LON errors.
    Figure 45-61. Tx Frame