J1939 bit positioning -> https://photos.app.goo.gl/7X24xgY8dR1aYTHDA
On Wed, May 20, 2020 at 1:45 PM William Hermans <[email protected]> wrote: > Oh forgot to mention. You'd need to use socketCAN. Perhaps this guy will > give you some ideas. > https://fabiobaltieri.com/2013/07/23/hacking-into-a-vehicle-can-bus-toyothack-and-socketcan/ > > > On Wed, May 20, 2020 at 1:40 PM William Hermans <[email protected]> wrote: > >> For the record, you do not have to wait for kernel 5.4 to do J1939. I >> wrote software using kernel 3.8.x that read a hybrid NIMEA 2000 protocol, >> which uses the same high level protocol as J1939. All you have to do is >> understand J1939, and bit wrangle . . . >> >> On Wed, May 20, 2020 at 7:33 AM Robert Nelson <[email protected]> >> wrote: >> >>> >>> >>> On Wed, May 20, 2020 at 2:54 AM Gwen Stouthuysen < >>> [email protected]> wrote: >>> >>>> I have the impression that your network is set up for J1939 or CANOpen >>>> (CAN 2.0B) >>>> >>>> when you send a message to a short address (CAN 2.0A) it doesn't get >>>> acknowledged, and this might crash your bus, as the BB will try to send it >>>> till the message is acknowledged.. >>>> Try to send a message to a 29bit address, or add a second can >>>> interface that will acknowledge your messages. (CAN1 on the BB). >>>> >>>> I'm a bit stuck on moving over to J1939, as that requires at least >>>> kernel 5.4, which results in boot issues due the overlay approach as >>>> applied in the Beaglebone OS >>>> >>> >>> The issue with 5.4 should now have been resolved... If you have free >>> time, please re-test and let me know. >>> >>> Regards, >>> >>> >>> -- >>> Robert Nelson >>> https://rcn-ee.com/ >>> >>> -- >>> For more options, visit http://beagleboard.org/discuss >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "BeagleBoard" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/beagleboard/CAOCHtYjJ4TpHSSmA9R0uL7YRYO3j8KPwv%3Dk74UB%3DCBJs8CTiJA%40mail.gmail.com >>> <https://groups.google.com/d/msgid/beagleboard/CAOCHtYjJ4TpHSSmA9R0uL7YRYO3j8KPwv%3Dk74UB%3DCBJs8CTiJA%40mail.gmail.com?utm_medium=email&utm_source=footer> >>> . >>> >> -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CALHSORq%2BSUdbdF5wEaFPy5DwxND2subqnwDdTDDCqa%2Bs4W11Tg%40mail.gmail.com.
