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FMS / J1939 standard, Truck's/BUS's

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scboris
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2020/11/24 08:41:04 (permalink)
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FMS / J1939 standard, Truck's/BUS's

Hello,

I try to receive CAN messages from Volvo/MAN/ truck and  bus . The high speed CAN bus in truck is 250kbit/s, but In one truck I can receive valid messages  and in another bus/truck no reaction.
I use SAM71V microcontroller with 12MHz quartz, and use these settings:

    
/** Nominal bit Baud Rate Prescaler */
 CONF_MCAN_NBTP_NBRP_VALUE= 5 
/** Nominal bit (Re)Synchronization Jump Width */
CONF_MCAN_NBTP_NSJW_VALUE =3
/** Nominal bit Time segment before sample point */
 CONF_MCAN_NBTP_NTSEG1_VALUE= 10
/** Nominal bit Time segment after sample point */
CONF_MCAN_NBTP_NTSEG2_VALUE =7



Anybody has experience in this theme?

Thanks a lot,
Boris
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