TMS320F28375S: CAN library setting to detect specific bit in message ID

Tohru Sakuma

CAN communication is performed using the CAN communication library, CANMessageSet () and CANMessageSet ().
I want to receive data with a specific bit of message ID (extension) 1 in that communication, but even if I try various settings and try it, I can not receive it if it does not match completely.
Is it possible to receive data with a specific bit of 1 without anexact match?

In the CANMessageSet () and CANMessageSet () of the library being used,
It is interpreted that it can be supported by setting it to the member of structure tCANMsgObject, ui32MsgIDMask, ui32Flags ...

sRXCANMessage.ui32MsgID; // CAN message ID-use 1
sRXCANMessage.ui32MsgIDMask; // no mask needed for TX
sRXCANMessage.ui32Flags;
sRXCANMessage.ui32MsgLen; // size of message is
sRXCANMessage.pucMsgData; // ptr to message content

By the way, the setting of Global Acceptance Mask Register (CANGAM) is supported in the CAN communication setting of DSP C28346.

over 6 years ago

0 Hareesh Janakiraman over 6 years ago

TI__Guru* 95315 points

Is it possible to receive data with a specific bit of 1 without an exact match?

Yes, it is possible. That is what acceptance filtering is all about.

Have you looked at my app.note SPRACE5? I have included an example (can_ex10_Mask.c) to show exactly how filtering works. Tables 1 to 3 clearly show the conditions under which a frame is/is not received.