TMS320F280049: Flags RMLIF0 and AAIF0 in DCAN

Thao Truong

Part Number: TMS320F280049

Hello e2e team,

In global interrupt flag registers (CANGIF0) of eCAN there're two bit RMLIF0 and AAIF0, which are set, when a receive-message is lost (RMLIFO) and the send transmission request is aborted (AAIF0). I don't find any flags in CAN_ES register of DCAN, which are same as these bits.

So I would like to ask whether there are corresponding flags in DCan equal RMLIF0 and AAIF0 in eCAN? Or how I can determine if a received message is lost and the send transmission request is aborted?

Thank you for your answer.

Best regards,

Thao

over 4 years ago

0 Hareesh Janakiraman over 4 years ago

TI__Guru* 95315 points

Thao,

Although both eCAN and DCAN conform to ISO 11898-1 standard, they are completely different designs. While you may find some commonality in the features, there are many features that are completely unique between these modules. 28xx eCAN register map/bit allocation/bit definitions are not compatible with DCAN. Hence DCAN is not software compatible with eCAN. DCAN follows a different programming model (in terms of how mailbox RAM is accessed and also in terms of the header files provided by TI). Direct write to the mailbox RAM is not possible. It is accessed through interface (IFx) registers. Think of the IFx registers as a “window” through which the mailbox RAM is accessed. The TRM chapter explains the CAN protocol implementation in the MCU. i.e. it explains the functions of the various registers/bits. However, it does not explain the protocol itself. For protocol information, refer to these excellent videos:

https://training.ti.com/automotive-can-overview

https://training.ti.com/ti-precision-labs-canlinsbc-can-and-can-fd-protocol?context=1139747-1138099-1139707-1138111

https://training.ti.com/ti-precision-labs-canlinsbc-can-and-can-fd-overview?context=1139747-1138099-1139707-1138109

https://training.ti.com/ti-precision-labs-canlinsbc-can-physical-layer?context=1139747-1138099-1139707-1138110

Have you looked at my App.Report at http://www.ti.com/lit/sprace5? In Table 4-2, I have tried my best to list our equivalent bits.

RMLIF --> CAN_IF1MCTL.MsgLst has the same function.

AAIF --> There is no equivalent.