stm32f103使用TIM1输出PWM的程式

以下是使用STM32F103的TIM1输出PWM的示例代码：

#include "stm32f10x.h"

int main(void)
{
  // Enable peripheral clock for TIM1
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);

  // Configure TIM1
  TIM_TimeBaseInitTypeDef TIM_TimeBaseStruct;
  TIM_TimeBaseStruct.TIM_Prescaler = 0;
  TIM_TimeBaseStruct.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseStruct.TIM_Period = 999; // PWM frequency = 72MHz / (period + 1)
  TIM_TimeBaseStruct.TIM_ClockDivision = TIM_CKD_DIV1;
  TIM_TimeBaseStruct.TIM_RepetitionCounter = 0;
  TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStruct);

  // Configure TIM1 channel 1 as PWM output
  TIM_OCInitTypeDef TIM_OCStruct;
  TIM_OCStruct.TIM_OCMode = TIM_OCMode_PWM1;
  TIM_OCStruct.TIM_OutputState = TIM_OutputState_Enable;
  TIM_OCStruct.TIM_Pulse = 499; // duty cycle = (pulse + 1) / (period + 1)
  TIM_OCStruct.TIM_OCPolarity = TIM_OCPolarity_High;
  TIM_OC1Init(TIM1, &TIM_OCStruct);

  // Enable TIM1 output compare preload register
  TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);

  // Enable TIM1 counter
  TIM_Cmd(TIM1, ENABLE);

  while(1)
  {
    // Do something
  }
}

该示例代码使用TIM1作为PWM输出，时钟频率为72MHz。TIM1的通道1被配置为PWM输出，占空比为50%。在while循环中可以添加其他代码。

需要注意的是，如果要在TIM1的其他通道上输出PWM，则需要进行类似的配置。此外，还需要根据具体的硬件连接情况，将TIM1通道1的输出连接到相应的引脚上。