stm32f103c8t6驱动电机代码

以下是使用STM32F103C8T6驱动直流电机的示例代码：

#include "stm32f10x.h"

#define MOTOR_PIN GPIO_Pin_0
#define MOTOR_PORT GPIOA

void PWM_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;
    
    // 使能定时器时钟
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
    // 使能GPIO时钟
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
    
    // 配置GPIO引脚
    GPIO_InitStructure.GPIO_Pin = MOTOR_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(MOTOR_PORT, &GPIO_InitStructure);
    
    // 配置定时器
    TIM_TimeBaseStructure.TIM_Prescaler = 72 - 1; // 时钟预分频
    TIM_TimeBaseStructure.TIM_Period = 5000 - 1; // 计数器周期
    TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
    
    // 配置PWM输出
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = 0; // 占空比
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
    TIM_OC3Init(TIM3, &TIM_OCInitStructure);
    
    // 使能定时器
    TIM_Cmd(TIM3, ENABLE);
    // 使能PWM输出
    TIM_CtrlPWMOutputs(TIM3, ENABLE);
}

void Motor_Run(uint16_t duty_cycle)
{
    TIM_OCInitTypeDef TIM_OCInitStructure;
    
    TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    TIM_OCInitStructure.TIM_Pulse = duty_cycle;
    TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
    TIM_OC3Init(TIM3, &TIM_OCInitStructure);
}

int main(void)
{
    PWM_Init();
    
    while(1)
    {
        Motor_Run(2500); // 占空比50%
        Delay(1000);
        Motor_Run(5000); // 占空比100%
        Delay(1000);
        Motor_Run(0); // 停止
        Delay(1000);
    }
}

注意：

1. 代码中使用了STM32F10x标准外设库，需要在工程中添加相应的库文件及头文件。

2. 代码中使用TIM3_CH3(PA6)输出PWM信号，需要连接一个N沟道MOS管，将MOS管的源极接地，负载接在MOS管的漏极上。

3. 占空比的计算公式：duty_cycle = (TIM_Period + 1) * (desired_duty_cycle / 100) - 1，其中TIM_Period为计数器周期，desired_duty_cycle为期望的占空比。例如，在本例中，计数器周期为5000，如果期望占空比为50%，则duty_cycle = (5000 + 1) * (50 / 100) - 1 = 2500。