stm32f103c8t6如何输出pwm波

可以使用STM32的定时器来实现PWM波的输出。以下是使用定时器3产生PWM波的示例代码：

#include "stm32f10x.h"

void PWM_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;
    TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;

    // 配置TIM3时钟
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

    // 配置GPIO
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // 配置TIM3
    TIM_TimeBaseInitStructure.TIM_Period = 19999;  // PWM频率为1kHz
    TIM_TimeBaseInitStructure.TIM_Prescaler = 71;  // 分频系数，总线时钟为72MHz
    TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM3, &TIM_TimeBaseInitStructure);

    // 配置TIM3的通道1为PWM模式
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;  
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;  
    TIM_OCInitStructure.TIM_Pulse = 1000;  // 占空比为50%
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;  
    TIM_OC1Init(TIM3, &TIM_OCInitStructure);

    TIM_Cmd(TIM3, ENABLE);  // 开启TIM3
}

int main(void)
{
    PWM_Configuration();

    while (1)
    {
    }
}