写一个使用stm32f103rct6做MCUA3982做步进电机驱动芯片使用PWM 控制步进电机速度程序的c文件和h文件定时器TIM3CH3PWM引脚PB0DIR引脚PB10ENABLE引脚PB11

.h文件：

#ifndef __STEP_MOTOR_H
#define __STEP_MOTOR_H

#include "stm32f10x.h"

#define PWM_FREQ 20000 // PWM频率20KHz

#define DIR_CW 0 // 顺时针
#define DIR_CCW 1 // 逆时针

void StepMotor_Init(void);
void StepMotor_SetSpeed(uint16_t speed);
void StepMotor_SetDirection(uint8_t dir);
void StepMotor_Start(void);
void StepMotor_Stop(void);

#endif /* __STEP_MOTOR_H */

.c文件：

#include "step_motor.h"

static uint16_t s_speed = 0;
static uint8_t s_dir = DIR_CW;

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

    // 使能GPIOB时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

    // 配置PWM引脚PB0
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_InitStructure);

    // 配置DIR引脚PB10
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_InitStructure);

    // 配置ENABLE引脚PB11
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &GPIO_InitStructure);

    // 使能TIM3时钟
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

    // 配置TIM3
    TIM_TimeBaseStructure.TIM_Period = 999; // PWM周期20ms
    TIM_TimeBaseStructure.TIM_Prescaler = SystemCoreClock / (PWM_FREQ * (TIM_TimeBaseStructure.TIM_Period + 1)) - 1;
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

    // 配置TIM3通道3为PWM输出
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = 0;
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
    TIM_OC3Init(TIM3, &TIM_OCInitStructure);
    TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);

    // 启动TIM3
    TIM_Cmd(TIM3, ENABLE);
}

void StepMotor_SetSpeed(uint16_t speed)
{
    s_speed = speed;
    TIM_SetCompare3(TIM3, s_speed);
}

void StepMotor_SetDirection(uint8_t dir)
{
    s_dir = dir;
    GPIO_WriteBit(GPIOB, GPIO_Pin_10, s_dir == DIR_CW ? Bit_RESET : Bit_SET);
}

void StepMotor_Start(void)
{
    GPIO_WriteBit(GPIOB, GPIO_Pin_11, Bit_SET);
}

void StepMotor_Stop(void)
{
    GPIO_WriteBit(GPIOB, GPIO_Pin_11, Bit_RESET);
}

使用方法：

1. 在main函数中调用StepMotor_Init()初始化步进电机驱动芯片。
2. 调用StepMotor_SetSpeed()设置步进电机速度，参数为0-999之间的数字，数字越大速度越快。
3. 调用StepMotor_SetDirection()设置步进电机方向，参数为DIR_CW或DIR_CCW。
4. 调用StepMotor_Start()启动步进电机，调用StepMotor_Stop()停止步进电机。