TMS320F28P650DK: TMS320F28P650DK9 : MCAN interrupt,IER gets disabled

Vivek T S

Prodigy 40 points

Part Number: TMS320F28P650DK
Other Parts Discussed in Thread: C2000WARE

Hi,

We were trying the mcan_ex10_receive_multiple_buffers example project for MCAN,

while sending a can message from a canoe the MCANIntr1ISR is executed but IER bit for interrupt group 9 gets disabled.

Tried enabling the bit from interrupt routine, the IER bit goes high but still not able to get any further interrupts.

what are we missing? bits in PIE for group 9 is also enabled.

thank you.

over 2 years ago

0 Hareesh Janakiraman over 2 years ago

TI__Guru* 95315 points

Vivek,

Interrupt nesting is not supported in hardware for C28x devices. Please see https://software-dl.ti.com/C2000/docs/c28x_interrupt_faq/html/index.html

0 Vivek T S over 2 years ago in reply to Hareesh Janakiraman

Prodigy 40 points

hi hareesh,

i am not getting an interrupt after exiting the isr also.

0 Hareesh Janakiraman over 2 years ago in reply to Vivek T S

TI__Guru* 95315 points

Are you referring to interrupts in general or specifically to MCAN interrupts? Did you read the article I pointed you to? Interrupts need to be configured/managed both at the peripheral level and at the CPU level. I also recommend reading sections 3.4.3 and 3.4.4 from www.ti.com/lit/SPRUIZ1.

0 Vivek T S over 2 years ago in reply to Hareesh Janakiraman

Prodigy 40 points

hi hareesh,

sorry for the delay in response. I had went through those articles,The interrupt group register and IER register for the MCAN interrupt has its corresponding bits enabled but I am not getting any interrupts after the completion of first ISR (when i am sending second can signal to the controller manually).

0 Sahil Deshpande over 2 years ago in reply to Vivek T S

TI__Expert 6035 points

Vivek,

What version of C2000ware are you using?

Is the following line included in the ISR?

//
// Clear the interrupt Status.
//
MCAN_clearIntrStatus(MCANA_DRIVER_BASE, intrStatus);

Thanks.

0 Vivek T S over 2 years ago in reply to Sahil Deshpande

Prodigy 40 points

hi,

using version 5 of c2000ware.

yes, those lines are included in the ISR.

thank you.

0 Sahil Deshpande over 2 years ago in reply to Vivek T S

TI__Expert 6035 points

Vivek,

If you are using the example out of the box, it should not cause any issues. The example has been validated and I just rechecked it and the interrupts work fine.

Have you made any changes to the code?

Vivek T S said:
Tried enabling the bit from interrupt routine, the IER bit goes high but still not able to get any further interrupts.

Please show the code you added here.

Could you also describe your entire setup. Is there anything else running that might cause the IER bit to be disabled?

Thanks.

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F28P650DK: TMS320F28P650DK9 : MCAN interrupt,IER gets disabled