topic Re: question on external crystal oscillator in S32K

question on external crystal oscillator

Jimny — Tue, 22 Dec 2020 08:21:32 GMT

Hello,

I made a minimal system board with s32k144. After I finished soldering the component and power the board on (no software flashed), I used an oscilloscope to watch the waveform of PTB6 and PTB7. There is no waveform, solely a constant dc voltage which is about 0.8V high.

Is it normal to have a constant dc voltage at these pins? I thought it should be a sine waveform. Please see the circuit below.

Re: question on external crystal oscillator

Robin_Shen — Wed, 23 Dec 2020 00:47:32 GMT

Hi ZZD,

The sine waveform is not generate by default. You need to initialize system oscillator (SOSC) first.

If Processor Expert is used, you can achieve it by configure SOSC in clock_manager.

Best Regards,
Robin
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Re: question on external crystal oscillator

Clivetwo — Fri, 28 May 2021 16:29:11 GMT

Hi,

I have a custom board using s32k144 and I'm using S32 Design Studio for S32 Platform.

My code stucks in timeout when starting external crystal:

CLOCK_SYS_ConfigureSOSC function: while ((CLOCK_SYS_GetSysOscFreq() == 0U) && (timeout > 0U))

I my processor expert there isn't an option for external crystal:

Thanks.