RM44L920: CAN multiple message BOX with External loop back mode

KARTHIK R

Part Number: RM44L920
Other Parts Discussed in Thread: HALCOGEN

I am using TI RM44L920APZT , in that using multiple CAN message box for DAQ system.with One single message Box i could able to get different values but if start using multiple CAN message BOX with EOB option enabled for the last message box the data is not as expected(same values are repeating).Please anyone could help me on this.

API used ;

canFillMessageObjectData(canREG1,canMESSAGE_BOX1,data);

canFillMessageObjectData(canREG1,canMESSAGE_BOX2,data);

canTransmit(canREG1,canMESSAGE_BOX1,data);

And do i need to use CanFILLMESSAGE for message box2 after first message box has been sent?

over 2 years ago

0 jagadish gundavarapu over 2 years ago

TI__Guru 69991 points

Hi Karthik,

We had an example project in HALCoGen.

You can access this example project by Help-> Help Topics

In Help Topics, click on the project "example_canCommunication"

In this example project, we are sending data from CAN and processing the transmitted data in CAN2.

Take this as a reference and verify the steps we are using in this example project.

Thanks & regards,
Jagadish.

0 KARTHIK R over 2 years ago in reply to jagadish gundavarapu

Prodigy 175 points

Hi Jagadish

I have tried these example for initial test for CAN. but my condition is that i need to only send CAN data without any TX request so i have chosen External loop back method.while using one message object we could see changes in logged data but when we try two message objects the data is repeating.Is it somewhat related to IF1/IF2 control register or Message value register.

0 jagadish gundavarapu over 2 years ago in reply to KARTHIK R

TI__Guru 69991 points

Hi Karthik,

KARTHIK R said:
canFillMessageObjectData(canREG1,canMESSAGE_BOX1,data);

canFillMessageObjectData(canREG1,canMESSAGE_BOX2,data);

canTransmit(canREG1,canMESSAGE_BOX1,data);

canTransmit(canREG1,canMESSAGE_BOX1,data);

why you are passing canMESSAGE_BOX1 two times to the canTransmit function, the repeating you are saying may be due to this?

Thanks & regards,
Jagadish.