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    • measure speed motor using Timer1 on stm32f030

    Posted by heitbs on 2016-11-17 19:37

    Hello every one.😀
    I'm using stm32f030 for a cheap project. I want it to measure motor speed by means of using a Hall effect rotary encoder and a comparator. the encoder makes fully digital pulses when motor rotates.
    STM32f030 doesn't have an ETR pin for external trigger and I have to use TI2FP2 pin to trigger TIMER 1.
    so:
    1- Should I set input trigger filter to value 0 or 15 to achieve maximum detectable frequency?
    2-I should set TIM1 to input capture mode or time base mode?which HAL functions should I use to detect TIMER1 overflow?
    3-what is the maximum detectable freq?
    4- is this kind of frequency meter ideal for other usages like measuring LC meter?
    5-what does the word "Trigger" mean in ARM timers? It is triggering timer main clock to count it up? or trigger is a clock itself?
    thanks so much.

    Reads: 13657
    Posted by diabolo38 on 2016-11-17 20:10

    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"