topic Re: Interrupt Vector Number in MPC5777M in MPC5xxx

Interrupt Vector Number in MPC5777M

yalamandadosaky — Mon, 10 Apr 2017 11:58:56 GMT

Hi PetrS martinkovar, Is there anyway that I can read IRQ (through register) numbers during run time for CAN node in MPC5777M .

suppose for M_CAN_1 the IRQ are 688 and 689.

So I want to read these numbers run time and raise the particular ISR.

Re: Interrupt Vector Number in MPC5777M

yalamandadosaky — Tue, 11 Apr 2017 15:24:37 GMT

Any Update?

Re: Interrupt Vector Number in MPC5777M

davidtosenovjan — Tue, 11 Apr 2017 15:31:10 GMT

I am afraid your question does not make too much sense to us. Could you please ask different way letting us to understand your question? Thanks

Re: Interrupt Vector Number in MPC5777M

yalamandadosaky — Tue, 11 Apr 2017 15:48:43 GMT

Thank you , OK . My requirement is like single ISR function to be used in my function and I want to call this function by checking IRQ number so that I can pass the parameters corresponding to that IRQ number.

Example :

ISR(x)

{

/// code

}

if(IRQ == 688u)

{

ISR(M_CAN_1)

}

else if (IRQ == 689u)

{

ISR(M_CAN2)

}

So through which register I can read IRQ number that caused the interrupt during runtime ?

Re: Interrupt Vector Number in MPC5777M

martin_kovar — Wed, 12 Apr 2017 07:54:01 GMT

Hello,

the solution you try to create is definitely not correct way, how interrupts should work or be implemented.

Correct way is to implement interrupt using peripheral interrupt registers and INTC controller configuration. Another way is to use polling, it means check peripheral interrupt flag by software.

Please look at the following example. It shows, how to use FlexCAN with interrupts. Example is not created for MPC5777M and MCAN module, but for MPC5775K and FlexCAN module, but the idea of using interrupts is the same.

Example MPC5775K FlexCAN_with_interrupts_v1.1 S32DS

For correct polling method implementation, please see the example below:

Example MPC5777M MCAN simple TX/RX GHS614

Please do not try to use the way you designed. It can cause unpredictable microcontroller behavior.

Regards,

Martin