stm32f103 pa15作为定时器2输出通道1输出pwm波形的代码

以下是使用STM32F103PA15作为定时器2输出通道1输出PWM波形的代码：

#include "stm32f10x.h"

void TIM2_PWM_Init(void)
{
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;
    GPIO_InitTypeDef GPIO_InitStructure;

    // 使能定时器2和GPIOA时钟
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

    // 配置PA15为复用推挽输出模式
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    // 配置定时器2为自动重载模式
    TIM_TimeBaseStructure.TIM_Period = 999;   // PWM波形周期
    TIM_TimeBaseStructure.TIM_Prescaler = 71; // 定时器时钟频率为72MHz/72=1MHz
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);

    // 配置TIM2通道1为PWM模式1
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = 499; // PWM波形占空比50%
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
    TIM_OC1Init(TIM2, &TIM_OCInitStructure);

    // 使能定时器2
    TIM_Cmd(TIM2, ENABLE);
}

int main(void)
{
    TIM2_PWM_Init();

    while (1)
    {
        // 循环执行其他任务
    }
}