C2000 eCAN bus-off condition

I am using the TI C2000 Simulink support package in 2018b. Occasionally in my environment the eCAN block detects errors (I assume TEC=128) and goes bus-off. Is there a way I can reset/clear this error without cycling power?

Thanks,

Don

Answer 1

[Donald]

I came up with something very similar, based on code in this post:

http://e2e.ti.com/support/microcontrollers/c2000/f/171/p/708073/2610614?tisearch=e2e-sitesearch&keymatch=ui16CANCTL#2610614

Declaration Code:

uint16_t ui16CANCTL;

Execution Code:

//Set the Auto-Bus-On bit in the CAN Control register to allow the CAN controller to recover from a bus-off event  
//Read the high 16 bits of the 32bit register                                                                      
ui16CANCTL = HWREGH(CANB_BASE + CAN_O_CTL);                                                                        
//Write the high 16 bits OR'd with the ABO bit                                                                     
HWREGH(CANB_BASE + CAN_O_CTL) = ui16CANCTL | CAN_CTL_ABO ;                                                         
//set timer to wait 0.1s before Bus-Off recovery sequence is started, $B71B0 should be 750000 clocks, which is 0.1s @ 7.5Mhz
HWREG(CANB_BASE + CAN_O_ABOTR) = 0x000B71B0;                                                                       
//Do the same for the A CAN bus                                                                                    
ui16CANCTL = HWREGH(CANA_BASE + CAN_O_CTL);                                                                        
HWREGH(CANA_BASE + CAN_O_CTL) = ui16CANCTL | CAN_CTL_ABO;                                                          
HWREG(CANA_BASE + CAN_O_ABOTR) = 0x000B71B0;                                                                       

This code shows up near the end of "model_name".c in the folder "model_name" _ert_rtw in my setup.

I can now force a bus-off and it will recover.

Thanks for the help,

Don

[ashwinee jadhao]

I have tried same solution but this is not solving my issue.

Here, file working on which is attached, please have a look

Thank you

Answer 2

[Venkatesh Chilapur]

Hi,

We provide custom code blocks under simulink coder->custom code->System Initialize using which you may initialize the ABO bit in the CAN_CTL Register to enable the 'Auto-Bus-On' feature. This will help recover the CAN bus from a bus off state.

Regards,

Venkatesh Chilapur

Answer 3

[Donald]

That sounds like what I want to do. I found the System Initialize block in the library, but I don't know the syntax of how to add setting ABO in CAN_CTL to this block.

Is there a tutorial or something you can point me to?

Thanks,

Don

Answer 4

[Venkatesh Chilapur]

Hi,

Adding the below line of code should help!

HWREG(CANA_BASE + CAN_O_CTL) |= CAN_CTL_ABO;

Regards,

Venkatesh Chilapur

Answer 5

[Donald]

This post has more info on the HWREG* macros...

http://e2e.ti.com/support/microcontrollers/other/f/908/t/380905?tisearch=e2e-quicksearch&keymatch=HWREGH%20vs%20HWREG