// 假设使用的是TIM2定时器的通道1
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
// 使能TIM2时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
// 配置TIM2基本参数
TIM_TimeBaseStructure.TIM_Period = 999; // 自动重装载值
TIM_TimeBaseStructure.TIM_Prescaler = 71; // 预分频
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
// 配置PWM模式和输出极性
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; // 选择PWM模式1
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 499; // 占空比50%
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; // 低电平有效
TIM_OC1Init(TIM2, TIM_OCInitStructure);
// 使能TIM2
TIM_Cmd(TIM2, ENABLE);
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