S32K144 FTM CLOCK can not set as SYS_CLK

[zhenglai]

Hi,

   I want to config FTM clock source,according this figure,I choose SYS_CLK as FTM clock.

In my codes,I config register so that work,

FTM0->MODE |= FTM_MODE_WPDIS_MASK;

FTM0->SC |= 0x00030008;

But when I use S32DS Debug find this register value Not equal to I write,

I refer  <<S32K1xx Series Reference Manual, Rev. 7, 04/2018>> ，it describes these bits :

so why s32k144 was force to set CLKS as 11b?  Is setting CLKS as 01b forbidden?

[razva_tilimpea]

Hi,

Are you sure that the value of SC is 0 before calling: FTM0->SC |= 0x00030008;?

Try to replate |= with =.

SC register is not buffered and it is not affected by synchronization mechanism, so SC value must match the value configured by you.

Razvan

[zhenglai]

Hi,

   Sorry,I have find where is problem,register is ok,my code bug! Thank you very much!