写stm 32c8t6小车电机减速程序，PB6输出PWMPB 8 PB 9控制左侧电机，PB7输出PWM控制PC13PC 14控制右侧电机

以下是一个简单的 STM32C8T6 小车电机减速程序，使用 PB6、PB8、PB9、PB7、PC13 和 PC14 控制两个电机：

#include "stm32c8t6.h"

void delay(int n)
{
    for(int i=0;i<n;i++);
}

void pwm_init()
{
    RCC_APB2ENR |= (1<<0); // Enable GPIOB clock
    RCC_APB2ENR |= (1<<4); // Enable GPIOC clock

    // Configure PB6 as PWM output
    GPIOB_CRL &= ~(0xF << 24);
    GPIOB_CRL |= (0xB << 24);

    // Configure PB8 and PB9 as general purpose output
    GPIOB_CRH &= ~(0xFF << 0);
    GPIOB_CRH |= (0x33 << 0);

    // Configure PB7 as PWM output
    GPIOB_CRL &= ~(0xF << 28);
    GPIOB_CRL |= (0xB << 28);

    // Configure PC13 and PC14 as general purpose output
    GPIOC_CRH &= ~(0xFF << 20);
    GPIOC_CRH |= (0x33 << 20);

    // Configure TIM3 for PWM
    RCC_APB1ENR |= (1<<1); // Enable TIM3 clock
    TIM3_PSC = 0; // Set prescaler to 1
    TIM3_ARR = 9999; // Set auto-reload value to 9999
    TIM3_CCMR1 |= (0x6<<4) | (0x6<<12); // Set PWM mode on channels 1 and 2
    TIM3_CCMR2 |= (0x6<<4) | (0x6<<12); // Set PWM mode on channels 3 and 4
    TIM3_CCER |= (1<<0) | (1<<4); // Enable PWM on channels 1 and 2
    TIM3_CCER |= (1<<8) | (1<<12); // Enable PWM on channels 3 and 4
    TIM3_CR1 |= (1<<0); // Enable TIM3
}

void motor_forward()
{
    // Set PB8 and PC14 high
    GPIOB_BSRR |= (1<<8);
    GPIOC_BSRR |= (1<<14);

    // Set PB9 and PC13 low
    GPIOB_BRR |= (1<<9);
    GPIOC_BRR |= (1<<13);

    // Set PWM duty cycle on PB8 and PC14
    TIM3_CCR1 = 5000;
    TIM3_CCR3 = 5000;

    // Wait for a short time
    delay(100000);
}

void motor_backward()
{
    // Set PB8 and PC14 low
    GPIOB_BRR |= (1<<8);
    GPIOC_BRR |= (1<<14);

    // Set PB9 and PC13 high
    GPIOB_BSRR |= (1<<9);
    GPIOC_BSRR |= (1<<13);

    // Set PWM duty cycle on PB9 and PC13
    TIM3_CCR2 = 5000;
    TIM3_CCR4 = 5000;

    // Wait for a short time
    delay(100000);
}

void motor_stop()
{
    // Set PB8, PB9, PC13 and PC14 low
    GPIOB_BRR |= (1<<8) | (1<<9);
    GPIOC_BRR |= (1<<13) | (1<<14);

    // Set PWM duty cycle on all channels to 0
    TIM3_CCR1 = 0;
    TIM3_CCR2 = 0;
    TIM3_CCR3 = 0;
    TIM3_CCR4 = 0;

    // Wait for a short time
    delay(100000);
}

int main()
{
    pwm_init();

    while(1)
    {
        motor_forward();
        motor_stop();
        motor_backward();
        motor_stop();
    }

    return 0;
}