ht32中用pwm调用l298n来对电机驱动调速代码

下面是HT32 PWM驱动L298N电机的示例代码：

#include <ht32.h>

#define PWM_FREQ    20000  // PWM频率为20kHz
#define PWM_STEP    1000   // PWM占空比调节步长为1000分之一

void PWM_Configuration(void)
{
    // 使能PWM时钟
    CKCU_APBPerip0ClockConfig(CKCU_APBEN0_PWM, ENABLE);

    // 配置PWM时钟源为Fpclk/1
    PWRCU_PeripClockConfig(PWRCU_PERIPH_PWM, ENABLE);
    PWRCU_SetAPBPeripheralClockDiv(PWRCU_APBP_PRESCALER_HCLK_DIV1);

    // PWM时钟 = Fpclk / (分频值 + 1) / (计数器周期 + 1)
    // 为了得到20kHz的PWM频率，分频值 = 1，计数器周期 = 72
    PWM_ConfigTypeDef PWM_ConfigStructure;
    PWM_ConfigStructure.PWM_Frequency = PWM_FREQ;
    PWM_ConfigStructure.PWM_OutputPolarity = PWM_POLARITY_HIGH;
    PWM_ConfigStructure.PWM_ClockSource = PWM_CLK_APB;
    PWM_ConfigStructure.PWM_Prescaler = 1;
    PWM_ConfigStructure.PWM_CounterMode = PWM_CNT_MODE_UP;
    PWM_ConfigStructure.PWM_PeriodValue = 72 - 1;
    PWM_ConfigStructure.PWM_PulseValue = 0;
    PWM_Init(PWM, PWM_CH_0, &PWM_ConfigStructure);

    // 配置GPIO
    AFIO_GPxConfig(GPIO_PB, GPIO_PIN_0, AFIO_FUN_PWM_TIM0_CH0, ENABLE);
    GPIO_DirectionConfig(GPIOB, GPIO_PIN_0, GPIO_DIR_OUT);
    GPIO_PullResistorConfig(GPIOB, GPIO_PIN_0, GPIO_PR_UP);

    // 启动PWM
    PWM_Cmd(PWM, PWM_CH_0, ENABLE);
}

void L298N_SetSpeed(uint16_t speed)
{
    // 调节PWM占空比
    PWM_SetPulseValue(PWM, PWM_CH_0, speed);
}

int main(void)
{
    PWM_Configuration();

    while (1)
    {
        // 调节电机速度
        for (int i = 0; i <= 1000; i += PWM_STEP)
        {
            L298N_SetSpeed(i);
            for (int j = 0; j < 500000; j++);
        }
        for (int i = 1000; i >= 0; i -= PWM_STEP)
        {
            L298N_SetSpeed(i);
            for (int j = 0; j < 500000; j++);
        }
    }
}

在上述代码中，通过PWM模块控制L298N的ENB引脚来调节电机的速度。通过修改PWM占空比来调节电机的转速，占空比越大，电机转速越快。