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Continue to ChatTIM3 Output Compare on the STM32 Family https://micromouseonline.com/2016/02/04/tim3-output-compare-interrupt-on-the-stm32-family/
TIM3 Output Compare on the STM32 Family https://micromouseonline.com/2016/02/04/tim3-output-compare-interrupt-on-the-stm32-family/