I write about TJA1128 LIN mini system basis chip.
The model used is TJA1128A.
I'm trying to read wake up source via UART. The TJA is in the correct mode when reading, i.e. it is in PORT mode.
As soon as I generate a remote (LIN) or local (button) wake-up event, starting from a SLEEP condition, the TJA wakes up correctly but the chip response following the UART request is always the same (0xFC) .
I am attaching some pictures to explain better.
WAKE UP DA LIN
WAKE UP DA BUTTON
For completeness, I add that:
The TJA has been configured in the following ways:
The UART has been configured as follows:
Can tou help me?
Solved! Go to Solution.
[solved]
Hi Tom,
REMOTE WAKE UP
Hi Anna,
I do not see the signals of EN and STBN. Without these signals I cannot comment on above plots. Could you measure with EN, STBN, RXD, RXD, RSTN and wake source pin (LIN or WAKE)?
Best regards,
Tomas
[solved]
Hi Tom,
REMOTE WAKE UP
Hi,
I followed the software flow because I had already read the application note.
Can you help me?
Anna
Hi,
Please take a closer look at Chapter 7.5 Wake-up source recognition and recommended Software Flow in Chapter 10 of the TJA1128 Application Hints:
https://www.nxp.com/products/interfaces/automotive-lin-solutions/lin-mini-system-basis-chip:TJA1128
Best regards,
Tomas