MPC5xxx中的主题 Re: MP5744P

MP5744P

Wen666 — Mon, 08 Jan 2024 01:25:43 GMT

Hello, when I use DEVKIT-MPC5744P, NXP official ETIMER routine on the ETimer_ISR interrupt function call, the main function of the main program does not directly call the ETimer_ISR function, how to achieve LED flashing? (I couldn't copy the routine function into the project I created.)

Re: MP5744P

petervlna — Mon, 08 Jan 2024 09:01:11 GMT

Hello,

Since I am really not sure which example you use.

Have a look at few of ours to understand how it works:

https://community.nxp.com/t5/MPC5xxx-Knowledge-Base/Example-MPC5744P-ETimerCountMode-S32DS-1-0/ta-p/1101944

https://community.nxp.com/t5/MPC5xxx-Knowledge-Base/MPC5-software-example-list/ta-p/1102445#MPC5744P

Also the eTimer examples are in S32DS example projects:

Best regards,

Peter

Re: MP5744P

Wen666 — Mon, 08 Jan 2024 13:16:07 GMT

OK,thank you.

Re: MP5744P

Wen666 — Mon, 08 Jan 2024 13:35:32 GMT

Hello, I am using this routine, that is, etimer initialization starts the interrupt, how is the interrupt into the interrupt function? Is there a callback function in the interrupt or something else, I just have a question here.

Re: MP5744P

Wen666 — Mon, 08 Jan 2024 13:37:01 GMT

Re: MP5744P

petervlna — Tue, 09 Jan 2024 05:42:56 GMT

Hello,

I am using this routine, that is, etimer initialization starts the interrupt

Well, that is not eTimer initialization function. That it interrupt service routine where you clear eTimer interrupt flag and toggle the pin state where is some LED connected.

how is the interrupt into the interrupt function?

Simply refer to reference manual INTC chapter for details:

In short:

1. eTimer interrupt flag is set

2. IVOR4 exception handler is called if priority is set in INTC for such interrupt.

3. In IVOR4 there is jump to address (offset set interrupt vector table) of ISR

First read trough reference manual, then check examples. If you need drivers, you can use autosar ones.

Best regards,

Peter