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hi all,
i am using the stm32f4 discovery board to drive my stepper motor in the rpm of between 0.001 to 500 RPM. for this i am using pwm. my clock frequency is 32MHZ and prescale for ABP1 is divided by 2 of my clock frequency. in this i cant make my pwm to act below the frequency of 250Hz because according to the time period calculation the timer over flow value is more than 65535. i need to set my frequency range of 3.33khz to .00667Hz. some body please assist me.