topic Re: Regarding Interrupt priority in MC9S12ZVML128 in S12 / MagniV Microcontrollers

Regarding Interrupt priority in MC9S12ZVML128

pratibhasurabhi — Thu, 30 Mar 2017 11:40:58 GMT

Hi,

I am using MC9S12ZVML1128 controller. I have implemented,

1. 50us interrupt-PMF reload interrupt in which motor control handler is called

2. 1ms interrupt-Timer Channel 3 interrupt in which PI loop executes.

While motor rotates in close loop, 50us interrupt is missing when 1ms interrupt comes even though I have given highest priority to 50us interrupt.

/* set PMF_reload Interrupt (0x0D0) priority 7*/

/* 0xD0/4=0x34 => reg. value = 0x30 + offset 4 */
INT_CFADDR = 0x30;//0x34;
INT_CFDATA0 = 7;

/* set Timer channel 3 ISR (0x1C0) to 6 */
/* 0x1C0 / 4 = 0x70 => reg. value = 0x70 + offset 0 */
INT_CFADDR = 0x70;
INT_CFDATA4 = 6;

Please provide me solution for the above question as early as possible.

danielmartynek — Thu, 30 Mar 2017 13:25:07 GMT

You have wrong Configuration Data Registers

It should be

/* set PMF_reload Interrupt (0x0D0) priority 7*/

D0/4 = 0x34

INT_CFADDR = 0x30; // 0x34 [7-4] = 0x30

INT_CFDATA4_ PRIOLVL = 0x07; // 0x34 [3-0] = 0x4 … 4th register INT_CFDATA4_ PRIOLVL

/* set Timer channel 3 ISR (0x1C0) to 6 */

1C0/4 = 0x70

INT_CFADDR = 0x70; // 0x70 [7-4] = 0x70

INT_CFDATA0_ PRIOLVL = 0x06; // 0x70 [3-0] = 0x0 … 0th register INT_CFDATA0_ PRIOLVL

I don’t know if it is only here or it is in your project as well

Regards

Daniel

pratibhasurabhi — Thu, 30 Mar 2017 14:31:59 GMT

Thanks Danial !

If there is more than one interrupt with same offset like,

Timer channel 3 ISR(1C0/4=0x70,offset=0)

PTUTrigger 1 Done ISR(0xE0/4=0x38,offset=0)

then which one data register is used for Timer channel 3 and PTU Trigger 1 Done Interrupt ?

danielmartynek — Fri, 31 Mar 2017 08:28:12 GMT

In this case, use the INT_CFDATA0 register for both of them:

INT_CFADDR = 0x70;

INT_CFDATA0_ PRIOLVL = INTERRUPT_PRIORITY_TIM3;

INT_CFADDR = 0x30;

INT_CFDATA0_ PRIOLVL = INTERRUPT_PRIORITY_PTU1;

Regards

Daniel