stm32 同一个定时器输入捕获和输出 pwm

对于STM32微控制器，可以使用同一个定时器模块实现输入捕获和输出PWM功能。下面是一个简单的示例，演示了如何使用定时器2来实现这两种功能：

1. 配置定时器2为输入捕获模式：

// 启用定时器时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

// 定时器2配置
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_TimeBaseStructure.TIM_Period = 0xFFFF;
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

// 输入捕获配置
TIM_ICInitTypeDef TIM_ICInitStructure;
TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICFilter = 0x0;
TIM_ICInit(TIM2, &TIM_ICInitStructure);

// 启用输入捕获
TIM_Cmd(TIM2, ENABLE);

2. 配置定时器2为输出PWM模式：

// 启用定时器时钟
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

// 定时器2配置
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_TimeBaseStructure.TIM_Period = 1000; // PWM周期
TIM_TimeBaseStructure.TIM_Prescaler = 71; // PWM频率 = 72MHz / (TIM_Prescaler + 1)
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

// PWM输出配置
TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 500; // PWM占空比
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM2, &TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM2, TIM_OCPreload_Enable);

// 启用PWM输出
TIM_Cmd(TIM2, ENABLE);

以上代码示例将定时器2配置为输入捕获模式和输出PWM模式，并分别使用了通道1进行配置。需要根据具体的需求进行参数配置，例如PWM周期、频率、占空比等。

希望这能帮助到你！如果有任何疑问，请随时提问。