FlexPWM Val Compare Interrupt Service Routine

duanemattern — Thu, 03 Nov 2016 13:30:44 GMT

I want to use FlexPWM on the TRK-MPC5604P board to trigger an analog sampling. I'll eventually use the cross triggering unit (CTU), but it has been giving me headaches to figure it out, so I thought I'd try something easier, just to get something running. I'd thought I'd just use an interrupt service routine on Val(n) matches. I've setup FLEXPWM0 on Module 2 and I can observe the A&B wavforms, (centerlined), and I can change the dutycycle on the fly from a serial interface. So the FLEXPWM_0.SUB[2].VAL[i].R are all setup properly and working.

I enabled the interrupts for ALL (trying to see anything), of the VAL matches AND reload using

FLEXPWM_0.SUB[2].INTEN.R = 0x103F;

I added the interrupt functions to the vector table

uint32_t IntcIsrVectorTable[] = {

....

(uint32_t)&PWM0_RF2_ISR, /* Vector - 185 Reload Module2 */
(uint32_t)&PWM0_COF2_ISR, /* Vector - 186 Compare Module2 */

and I added the interrupt service routines, and enabled the external interrupts using ( asm(" wrteei 1"); ) This also includes a period interrupt timer PIT. After compiling, I can debug this on the target using CodeWarrior for MCU (V10.6 Eclipse). I can set a breakpoint in the PIT interrupt service routine and break on the interrupt. But I cannot break in either of the two PWM0 interrupts service routines. It's as if the interrupts are never generated.

So my questions are:

1) , besides enabling external interrupts using asm(" wrteei 1"); is there something else that I must do to enable the PWM VAL matching/compare interrupts?

2) The original demo code had source code for the period interrupt timer that did not include "#pragma interrupt on". Is this a compiler directive that I need for the interrupt service routine to get a "return from interrupt" ?

Re: FlexPWM Val Compare Interrupt Service Routine

petervlna — Thu, 03 Nov 2016 14:15:28 GMT

Hi,

Have you tried to read my example/document for CTU?

https://community.nxp.com/docs/DOC-102559

The mechanism is exactly the same as for MPC5604P.

Peter

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FlexPWM Val Compare Interrupt Service Routine

Re: FlexPWM Val Compare Interrupt Service Routine