MKL17Z256 TPM with OSCERCLK

aarondiamant — Wed, 15 Feb 2017 21:40:23 GMT

I am using a 32.768 kHz ABRACON ABS25-32.768KHZ-T crystal (same as the FRDM-KL03Z) connected to pins EXTAL0 / XTAL0
The crystal has a CL of 12.5pF. I am configuring a load capacitance of 21pF
TPM is configured for OSCERCLK clock
When I execute the application in KDS with the PEMicro debugger I have no problem generating the proper PWM output
If I execute the flashed application with no debugger there is no PWM signal generated

I assume there is some kind of initialization being done while executing with the debugger that Processor Expert or myself are not doing. If the TPM is clocked with MCGIRCLK there is no problem while debugging or stand-alone.

Thanks!

Re: MKL17Z256 TPM with OSCERCLK

aarondiamant — Thu, 16 Feb 2017 01:56:07 GMT

It is working now.

The problem was that Cpu.c calls TPM_DRV_PwmStart(tpmTmr1_IDX, &tpmTmr1_ChnConfig0, 0U); and I was calling it again in main.c

When debugging, by default execution stops in main.c at PE_low_level_init();. Apparently if there is enough time between calls to PM_DRV_PwmStart(tpmTmr1_IDX, &tpmTmr1_ChnConfig0, 0U); there is "no problem". So when executing from flash with no debugger, the 2 calls happen very quickly and the TPM doesn't work. Removing the call from main.c solves the problem.

topic MKL17Z256 TPM with OSCERCLK in Kinetis Microcontrollers

MKL17Z256 TPM with OSCERCLK

Re: MKL17Z256 TPM with OSCERCLK