代码如下：
void TIM_Configuration()
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_TimeBaseStructure.TIM_Period = 200; //
TIM_TimeBaseStructure.TIM_Prescaler = 7199; //
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM3,&TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //PWM模式1输出
TIM_OCInitStructure.TIM_Pulse = Duty;//占空比=(CCRx/ARR)*100%
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High ;//TIM输出比较极性高
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;//使能输出状态
TIM_Cmd(TIM3, ENABLE);
}
Duty = 90;
TIM_PWMConfiguration();
TIM_OC1Init(TIM3, &TIM_OCInitStructure);//TIM3的CH1输出
TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);
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