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stm32f303 adc not working with 18msps

Question asked by tag.aseok on Jan 30, 2017


I tested stm32cubef3 (rev 1.6&1.7) ADC_DualMode_18Msps example with stm32f3 discovery board, i applied a 100KHz pwm wave to pc1, captured 32768 samples and calculated conversion rate by counting the number of pwm peaks.

The calculation shows ~12msps conversion rate, i repeated this experiment with different cpu frequencies, the results are similar. what is the problem?