Nucleo board 64 F070 Crystal output Problem

[thannara123]

Hi 'I am using STM32 Nulceo Board Nucleo-F070RB .

I tried some projects but the output of the project is not as expected ,shows some wrong calculation out .

So I checked everything ,And found out the Crystal frequancy is not correct .

I checked the Master Clock Output But here i am not getting the clock frequency ,

May i get the accurate frequency there ?

I  tried the internal HSI also But nothing gain 

When I select HSI is 8MHZ i am getting in MCO out is 1.724KHz  is it board problem ?

what wrong i am with ,   

please help me 

[AScha.3]

Right. ARR -> full period. (+ 1 , because period starts with "0" . )

so set ARR 200 , CCRx 50 -> get 25% on, 75% off PWM . (ARR 199 , to be exact, to count 200 ticks )