stm32的PA1端口输出pwm的标准库函数程序

下面是使用STM32标准库函数输出PWM的程序：

#include "stm32f10x.h"

void PWM_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;

    // 使能TIM2和GPIOA时钟
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

    // 配置PA1引脚为复用输出模式
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // 设置TIM2的计数频率为72MHz
    TIM_TimeBaseStructure.TIM_Period = 7200 - 1;
    TIM_TimeBaseStructure.TIM_Prescaler = 10 - 1;
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

    // 配置TIM2的通道1为PWM输出模式
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = 3600 - 1;
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
    TIM_OC1Init(TIM2, &TIM_OCInitStructure);

    // 使能TIM2的计数器
    TIM_Cmd(TIM2, ENABLE);
}

int main(void)
{
    PWM_Init();

    while (1)
    {
    }
}

这个程序使用TIM2的通道1输出PWM信号，频率为10kHz，占空比为50%。如果需要改变频率和占空比，可以修改`TIM_TimeBaseStructure`和`TIM_OCInitStructure`结构体中的参数。