stm32f103 c8t6的定时器3驱动l298n电机

首先，需要配置定时器3的时钟和模式。以下是基本的配置代码：

RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_TimeBaseStructure.TIM_Period = 999; // 计数器周期
TIM_TimeBaseStructure.TIM_Prescaler = 719; // 分频器
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

然后，需要配置定时器3的输出比较通道1和通道2，以控制L298N驱动器的电机方向。以下是基本的配置代码：

TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_Pulse = 0;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
TIM_OC1Init(TIM3, &TIM_OCInitStructure);
TIM_OC2Init(TIM3, &TIM_OCInitStructure);

接下来，需要编写函数来控制L298N驱动器的电机方向和速度。以下是基本的代码：

// 控制电机方向和速度
void Motor_Control(uint8_t direction, uint16_t speed)
{
    if (direction == 0) // 正转
    {
        GPIO_ResetBits(GPIOA, GPIO_Pin_5);
        GPIO_SetBits(GPIOA, GPIO_Pin_6);
        TIM_SetCompare1(TIM3, speed);
        TIM_SetCompare2(TIM3, 0);
    }
    else if (direction == 1) // 反转
    {
        GPIO_SetBits(GPIOA, GPIO_Pin_5);
        GPIO_ResetBits(GPIOA, GPIO_Pin_6);
        TIM_SetCompare1(TIM3, 0);
        TIM_SetCompare2(TIM3, speed);
    }
    else // 停止
    {
        GPIO_ResetBits(GPIOA, GPIO_Pin_5);
        GPIO_ResetBits(GPIOA, GPIO_Pin_6);
        TIM_SetCompare1(TIM3, 0);
        TIM_SetCompare2(TIM3, 0);
    }
}

最后，在主函数中调用Motor_Control函数来控制电机方向和速度。例如，以下代码可以让电机正转并且速度为50：

Motor_Control(0, 50);