ʾʹõԴ
TIM3 CH1     --   PA5
RCC  MCO     --   PA7


ʾḶ́
1ϵʱӣRCH 48MHz
2MCORCHDIV88Ƶ1MHz
3MCOźӵTIM3ͨ1
4TIM3ͨ1TI1FP1ӳ䵽IC1ϣЧʱ¼
5TIM3ͨ1TI1FP1ӳ䵽IC2ϣ½Чʱ¼
6жϷмMCOϵʱռձȺƵʣ
   g_pwm_frequencyõPMWƵʣ
   g_pwm_dutyõPWMռձȡ
   