stm32f103c8t6 PA2 Tim5_ch2 输出PWM

好的，以下是基本步骤：

1. 首先需要开启TIM5时钟。

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE);

2. 然后设置TIM5的时基，这里我们选择PWM模式。

TIM_TimeBaseStructure.TIM_Period = 999; //设置计数器自动重装值
TIM_TimeBaseStructure.TIM_Prescaler = 71; //设置预分频值
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //计数器向上计数
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //时钟分频因子
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0; //重复计数器值
TIM_TimeBaseInit(TIM5, &TIM_TimeBaseStructure); //初始化TIM5

3. 接下来配置TIM5通道2输出PWM信号。

TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //PWM模式1
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //允许输出
TIM_OCInitStructure.TIM_Pulse = 500; //脉冲宽度
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性
TIM_OC2Init(TIM5, &TIM_OCInitStructure); //初始化TIM5通道2

4. 最后开启TIM5计数器即可。

TIM_Cmd(TIM5, ENABLE);

完整示例代码如下：

#include "stm32f10x.h"

int main(void)
{
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM5, ENABLE); //开启TIM5时钟

    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;

    //设置TIM5的时基，这里我们选择PWM模式
    TIM_TimeBaseStructure.TIM_Period = 999; //设置计数器自动重装值
    TIM_TimeBaseStructure.TIM_Prescaler = 71; //设置预分频值
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //计数器向上计数
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //时钟分频因子
    TIM_TimeBaseStructure.TIM_RepetitionCounter = 0; //重复计数器值
    TIM_TimeBaseInit(TIM5, &TIM_TimeBaseStructure); //初始化TIM5

    //配置TIM5通道2输出PWM信号
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //PWM模式1
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //允许输出
    TIM_OCInitStructure.TIM_Pulse = 500; //脉冲宽度
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性
    TIM_OC2Init(TIM5, &TIM_OCInitStructure); //初始化TIM5通道2

    TIM_Cmd(TIM5, ENABLE); //开启TIM5计数器

    while(1)
    {
        //可以在这里修改TIM5通道2的脉冲宽度
    }
}