RCT6中标准库PWM通道2初始化代码

在RCT6中，使用标准库初始化PWM通道2的代码如下：

#include "stm32f10x.h"

// 定义PWM相关参数
#define TIMx            TIM2
#define RCC_APB1Periph_TIMx     RCC_APB1Periph_TIM2
#define GPIO_Pin_x      GPIO_Pin_1
#define GPIO_PinSource_x    GPIO_PinSource1
#define GPIOx           GPIOA
#define RCC_APB2Periph_GPIOx    RCC_APB2Periph_GPIOA
#define TIM_OCxInit     TIM_OC2Init
#define TIM_OCxPreloadConfig TIM_OC2PreloadConfig

void PWM_Channel2_Init(uint16_t period, uint16_t duty_cycle)
{
    // PWM时钟使能
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIMx, ENABLE);
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOx, ENABLE);

    // GPIO初始化
    GPIO_InitTypeDef GPIO_InitStructure;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_x;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOx, &GPIO_InitStructure);

    // PWM计数器初始化
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_TimeBaseStructure.TIM_Period = period - 1;  // 设置周期
    TIM_TimeBaseStructure.TIM_Prescaler = 719;      // 设置预分频值
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIMx, &TIM_TimeBaseStructure);

    // PWM输出通道初始化
    TIM_OCInitTypeDef TIM_OCInitStruct;
    TIM_OCInitStruct.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStruct.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStruct.TIM_Pulse = duty_cycle;
    TIM_OCInitStruct.TIM_OCPolarity = TIM_OCPolarity_High;
    TIM_OCxInit(TIMx, &TIM_OCInitStruct);

    // 使能PWM输出通道
    TIM_OCxPreloadConfig(TIMx, TIM_OCPreload_Enable);

    // 启动PWM
    TIM_Cmd(TIMx, ENABLE);
}

其中，`period`和`duty_cycle`参数分别为PWM的周期和占空比。这里使用的是定时器TIM2和对应的GPIOA_Pin1进行PWM输出。如果需要使用其他定时器或IO口，需要修改相应的宏定义。