RM46L852: How to get the message box ID inside the canStatusChangeNotification ISR?

Gabriel B

Part Number: RM46L852
Other Parts Discussed in Thread: HALCOGEN

Hi,

How to get the message box ID inside the canStatusChangeNotification ISR?

I tried the following without success.

void canStatusChangeNotification(canBASE_t *node, uint32 notification)
{
    if ((notification & canLEVEL_RxOK) != 0)
    {
        // Wait until IF2 is ready for use
        while ((node->IF2STAT & 0x80U) == 0x80U)
        {
        }
        uint8_t const msgbox = node->IF2NO;
    }
 }

For context, here's what I'm trying to do:

I want to know how many CAN frames my message boxes receive per second to make sure other devices on the bus have not timeout.

Note that I don't necessarily want to use the data inside the message box; just know how much time has elapsed since a message was received.

Regards,

Gabriel

over 2 years ago

0 Gabriel B over 2 years ago

Intellectual 371 points

I looked at the HalCoGEn examples and QJ Wang FAQ whiteout success.

0 jagadish gundavarapu over 2 years ago in reply to Gabriel B

TI__Guru 73591 points

Hi Gabriel,

Looks like FAQ is not pointing to the right page,

Can you please reshare it?

0 Gabriel B over 2 years ago in reply to jagadish gundavarapu

Intellectual 371 points

Hi Jagadish,

I'm glad you're following this issue.
Here the FAQ link software-dl.ti.com/.../index.html

0 jagadish gundavarapu over 2 years ago in reply to Gabriel B

TI__Guru 73591 points

Hi Gabriel,

Thanks for sharing the link and i will go through it now.

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

TI__Guru 73591 points

Hi Gabriel,

For my understanding all status change interrupts like WakeUpPnd, RxOk, TxOk, and LEC are CAN level interrupts and they are not message box level interrupts.

I would like to know why you required message box number in these interrupts?

Thanks & regards,
Jagadish.

0 Gabriel B over 2 years ago in reply to jagadish gundavarapu

Intellectual 371 points

Of course:

I have a small amount of CAN messages.
Therefore I can afford to attribute 1 messages box per CAN ID.

I want to use ISR to know when was the last time a message was received by a given message box.
The goal is to ensure nodes on the bus have not timeout.

0 jagadish gundavarapu over 2 years ago in reply to Gabriel B

TI__Guru 73591 points

Hi Gabriel,

Thanks for providing details. I will test it at my end and update you.

Thanks & regards,
Jagadish.

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

TI__Guru 73591 points

Hi Gabriel,

Can you try to do below thing,

Can you verify the Interrupt pending register value to get the message object number?

In status change notification handler just try to read this register for different message objects and see.

Thanks & regards,
Jagadish.

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RM46L852: How to get the message box ID inside the canStatusChangeNotification ISR?