topic kl43z timer issue in Kinetis Microcontrollers

kl43z timer issue

kennethgraakjær — Wed, 04 Mar 2015 22:47:04 GMT

I'm trying to do a bare bones timer setup on the frdm kl43z board.

In my source I have:

#include "fsl_device_registers.h"

int main() {

TPM2_SC |= TPM_SC_PS(0x7); // prescaler at 128.

/* other stuff */

}

However when I encounter the above line in debug mode it triggers the default interrupt handler. This is the same for all timers TPM0 - 2.

Any ideas as to what I'm missing?

Re: kl43z timer issue

Jorge_Gonzalez — Wed, 04 Mar 2015 22:57:38 GMT

Hello Kenneth Graakjaer:

Have you enabled the clock gate for TPM2?

This must be done before configuring any TPM2 register. The line of code would be this:

SIM_SCGC6 |= SIM_SCGC6_TPM2_MASK;

This applies to any peripheral; before accesing the registers you have to enable the clock gates.

Regards!,
Jorge Gonzalez

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Re: kl43z timer issue

kennethgraakjær — Fri, 06 Mar 2015 22:30:26 GMT

Worked like a charm! Thank you.

I had the clock source in SIM_SOPT2 confused with the clock gate.