What do I need to generate DCAN3 IF3 interrupt?

Vitaliy Bortsov

Other Parts Discussed in Thread: RM46L852

Hello.

I use RM46L852 chip and want to generate IRQ for end transfer from CAN3 RAM to IF3 registers.

I write IF3 Observation register with 0x1F and write IF3UPD12/34 registers to watch for message objects.
Then I write an address of my function in VIM RAM vector 60 for IRQ handler and enable that IRQ by setting bit 28 of REQENASET1.

After generation of CAN packet, I see that IF3OBS = 0x9F1F (and it is correct value, IRQ flag with bit15 = 1, all data, control, mask and ID is transfered from CAN RAM to IF3), but no IRQ is generated. What I need to generate IRQ for IF3? Where is IRQ Enable flag for IF3? Do I need to "enable DMA requests for IF3" by setting DE3 in CTL even if I does not use DMA?

All other IRQs for other peripherals is generated correctly.

Regars, Vitaliy

over 8 years ago

0 Bob Crosby over 8 years ago

TI__Guru 72500 points

Did you set the RxIE bit of the IFxMCTL when you setup the mailboxes that you want to autoload into IF3 registers when they receive a frame?

0 Vitaliy Bortsov over 8 years ago in reply to Bob Crosby

Intellectual 340 points

Hello, Bob.

No, I did not set RxIE bit.

Do I need to set this bit? TRM tell that IF3OBS bit15 is enough to generate IRQ.

0 Bob Crosby over 8 years ago in reply to Vitaliy Bortsov

TI__Guru 72500 points

Hello Vitaliy,

I finally got it working. RxIE is not required, but DE3 (DMA enable IF3) in DCAN CTL is required to be enabled. I will request that the TRM is updated to include this fact.

0 Vitaliy Bortsov over 8 years ago in reply to Bob Crosby

Intellectual 340 points

Thanks, Bob. That is working.

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What do I need to generate DCAN3 IF3 interrupt?