measure speed motor using Timer1 on stm32f030
Capture compare is likley best simplest option
the max freq you can measure is close to half the timer clk feq/ prescaler but then accuray is bad.
basiclay you have to set timer clk high enought to get precsion but not to much to cope with smallest fequencies you can measure
i sugest you read http://www.st.com/content/ccc/resource/technical/document/application_note/54/0f/67/eb/47/34/45/40/DM00042534.pdf/files/DM00042534.pdf/jcr:content/translations/en.DM00042534.pdf
have a look at CubeF0 (or F4) example for code sample or just google 😉
note that the timers are not arm they are st periferals , triger most ofen refer to "enable timer counter"