stm32f103zet6pwm输出方波

您可以使用STM32F103的定时器来输出PWM信号，以下是一个简单的代码示例：

#include "stm32f10x.h"

int main(void)
{
  // 初始化GPIO
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
  GPIO_InitTypeDef GPIO_InitStructure;
  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);

  // 初始化定时器1
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
  TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
  TIM_TimeBaseStructure.TIM_Period = 999; // PWM信号周期为1000
  TIM_TimeBaseStructure.TIM_Prescaler = 71; // 时钟预分频为72
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
  TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);

  // 初始化PWM输出
  TIM_OCInitTypeDef TIM_OCInitStructure;
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCInitStructure.TIM_Pulse = 500; // 占空比为50%
  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
  TIM_OC1Init(TIM1, &TIM_OCInitStructure);
  TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);

  // 启动定时器1
  TIM_Cmd(TIM1, ENABLE);

  while (1)
  {
    // 循环等待
  }
}

上述代码以PA6为例，输出一个PWM信号，周期为1000，占空比为50%。您可以根据需要修改GPIO引脚和定时器参数。