topic Re: S12XE Port P Interrupt on Both Edges in S12 / MagniV Microcontrollers

S12XE Port P Interrupt on Both Edges

rayhall — Tue, 12 Apr 2016 09:00:00 GMT

I have a square wave signals on these pins, PP0, PP1, PP2, PP3, PP4 and PP5. I want an interrupt on both edges. I do not want to count or time the edges. I want to mirror the signals onto pins PT0, PT1, PT2, PT3, PT4 and PT5.

I have tried to use ECT in Xgate, but the Interrupts do not work for me. I see there is a Port P Interrupt vector in XGate. Will this interrupt on all edges on all port P Pins.

Ray.

Re: S12XE Port P Interrupt on Both Edges

RadekS — Tue, 12 Apr 2016 12:21:25 GMT

Hi Ray,

pin interrupt works always only for one type of edge, despite on fact whether this interrupt is handled by CPU or XGATE.

So, you could modify edge settings at every edge or externally route these signals to port T pins and use input capture feature for ECT.

Could you please share here your configuration of ECT and XGATE interrupt routines for a short check?

The typical issue in the case of multiple timer channels is flag clearing mechanism.

Please use “ECT_TFLG1 = 0x01;” or “ECT_TFLG1 = ECT_TFLG1_C0F_MASK;” instead “ECT_TFLG1_C0F=1;” command. The command “ECT_TFLG1_C0F=1;” is read/modify/write command which will clear all pending flags in this register.

I hope it helps you.

Have a great day,
RadekS

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Re: S12XE Port P Interrupt on Both Edges

rayhall — Wed, 13 Apr 2016 08:36:03 GMT

Radek,

Still no luck. I have included the project files.

Ray.

Re: S12XE Port P Interrupt on Both Edges

RadekS — Wed, 13 Apr 2016 11:08:06 GMT

Hi Ray,

I shortly looked at your code, and…:

I do not see a command for enable timer in your ECT_Init() function. For example: TSCR1 = 0xE0;
You set port T pins as digital output inside Init_Pins(). When we enable timer, it will overtake control on these pins, however it still could be dangerous because you have these pins connected together with port P output pins. So, there is potential risk of short between these pins.
Note: PE_low_level_init() already enable interrupts.

Re: S12XE Port P Interrupt on Both Edges

rayhall — Thu, 14 Apr 2016 08:48:22 GMT

Radek,

I have found the reason the ECT interrupts are not working. I should be using the TIM input capture. This interrupts on Port P pins and not the ECT input capture which uses Port T.

I will change the code so I am using the correct timer.

Ray.

Re: S12XE Port P Interrupt on Both Edges

RadekS — Thu, 14 Apr 2016 09:22:39 GMT

Hi Ray,

Thank you for let us know the root cause.

Best Regards,
RadekS