topic Re: TRGMUX Port Pin Trigger in Kinetis Microcontrollers

TRGMUX Port Pin Trigger

jh0 — Tue, 13 Apr 2021 13:40:15 GMT

Hi,

I want to start/stop FlexIO timers with one (non FlexIO) port pin. When pin goes high, timers are started, and when pin goes low, timers are stopped.

I configured (port A pin 1) with PORT PCR values MUX 1 (GPIO) and IRQC 13 (Enable active high trigger output, flag is disabled. [The trigger output goes to the trigger mux, which allows pins to trigger other peripherals (configurable polarity; 1 pin per port; if multiple pins are configured, then they are ORed together to create the trigger)].

I configured TRGMUX_FLEXIO0 with SEL0 value 0x2A Port A Pin Trigger is selected.

Also configured FlexOI timers and everything is working fine, as expected.

But when I change state of other pin on port A, this have influence on trigger, and I don't understand why, because for all other pins on the same port A, IRQC value in PCR is zero. How I can isolate trigger to just one port pin?

Device is K32L2A31.

Regards,

Josip

Re: TRGMUX Port Pin Trigger

FelipeGarcia — Tue, 20 Apr 2021 14:49:16 GMT

Hi Josip,

Could you please share the code you are using to configure TRGMUX? I would like to investigate this in more detail.

Best regards,

Felipe

Re: TRGMUX Port Pin Trigger

jh0 — Wed, 21 Apr 2021 15:27:57 GMT

Hi Felipe,

I just made simple program with few lines of code to demonstrate this, together with scope screenshots, to attach all together here.

But, everything is working fine as it should. Only port pin that is triggering FlexIO timers start / stop is one pin with IRQC 13. Other pins with IRQC 0 doesn't disturb FlexIO timers on any way. So everything is OK with device, problem is somewhere else in my code.

Regards,

Josip