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TMS570LC4357: Nested interrupts - serial data gets corrupted while receiving CAN input

anil pande
Prodigy 80 points
Part Number: TMS570LC4357

Hi TI experts,

Greetings!

We are using TMS570Lc43 microcontroller (FreeRTOS as a RTOS)  - two CAN channels as input.

When we receives data on both channels (separate CAN bus) we observed that serial data gets corrupted.

What modification  need to be done so that both CAN channels with serial work simultaneously.

I believe its a issue of nesting of interrupts. How it can be resolved.

Thanks in advance.

Anil 

  • 0
    TI__Mastermind 29338 points

    Hi, our expert is out of the office. Please expect a delayed response.

  • 0 in reply to Frank Livingston
    TI__Guru**** 196736 points

    Hi,

    Interrupt Nesting is strongly not recommended for Safety Application.

    Typically ISR's must be very quick, hence it should be of minimal code as possible. The CPU will automatically disable IRQ as soon as it enters in IRQ mode to avoid nested IRQ.

    To receive DCAN data, please use IF3x + DMA to read the received CAN message. The IF3 can be configured to automatically receive control and user data from the Message RAM when a message object has been updated after reception of a CAN message. The CPU does not need to initiate the transfer from Message RAM to IF3 register set.

  • 0
    Prodigy 80 points

    Thanks for your reply. I am able to find and resolve issue. Issue lies with memory overwrite.

    Tbanks