用固件库配置STM32F103C8T6的TIM3的PB0，PB1，PB5的初始化代码

以下是用固件库配置STM32F103C8T6的TIM3的PB0，PB1，PB5的初始化代码：

#include "stm32f10x.h"

void TIM3_GPIO_Config(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    // Enable GPIOB clock
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

    // Configure PB0, PB1, PB5 as alternate function push-pull
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_5;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOB, &GPIO_InitStructure);
}

void TIM3_Configuration(void)
{
    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
    TIM_OCInitTypeDef  TIM_OCInitStructure;

    // Enable TIM3 clock
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

    // Time base configuration
    TIM_TimeBaseStructure.TIM_Period = 999; // 1 kHz PWM frequency
    TIM_TimeBaseStructure.TIM_Prescaler = 71; // 72 MHz / 72 = 1 MHz
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

    // PWM1 Mode configuration: Channel3 (PB0), Channel4 (PB1), Channel2 (PB5)
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = 499; // 50% duty cycle
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;

    TIM_OC3Init(TIM3, &TIM_OCInitStructure);
    TIM_OC4Init(TIM3, &TIM_OCInitStructure);
    TIM_OC2Init(TIM3, &TIM_OCInitStructure);

    // Enable TIM3 peripheral Preload register on ARR
    TIM_ARRPreloadConfig(TIM3, ENABLE);

    // Enable TIM3 peripheral Preload register on CCR3, CCR4, CCR2
    TIM_OC3PreloadConfig(TIM3, ENABLE);
    TIM_OC4PreloadConfig(TIM3, ENABLE);
    TIM_OC2PreloadConfig(TIM3, ENABLE);

    // Enable TIM3 counter
    TIM_Cmd(TIM3, ENABLE);
}

int main(void)
{
    // Initialize GPIO for TIM3
    TIM3_GPIO_Config();

    // Configure TIM3
    TIM3_Configuration();

    while(1)
    {
        // Do something
    }
}

在上面的代码中，我们使用了STM32固件库来初始化GPIO和TIM3模块。首先，在`TIM3_GPIO_Config()`函数中，我们使能了GPIOB的时钟，并将PB0、PB1、PB5配置为复用推挽输出。接下来，在`TIM3_Configuration()`函数中，我们使能了TIM3的时钟，并对其进行了配置，以生成1 kHz的PWM波形。然后，我们配置了TIM3的三个通道，分别对应PB0、PB1和PB5引脚，并将它们设置为PWM输出模式。最后，我们使能了TIM3的计数器并进入了主循环。