STM32F407驱动L298N程序

以下是一个简单的示例程序，使用STM32F407的TIM和GPIO模块驱动L298N芯片：

#include "stm32f4xx.h"

#define PWM_PERIOD 1000

void PWM_Init(void);
void GPIO_Init(void);
void Delay(uint32_t nCount);

int main(void)
{
    GPIO_Init();
    PWM_Init();

    // L298N控制信号
    GPIO_SetBits(GPIOB, GPIO_Pin_0);
    GPIO_ResetBits(GPIOB, GPIO_Pin_1);
    GPIO_SetBits(GPIOB, GPIO_Pin_2);
    GPIO_ResetBits(GPIOB, GPIO_Pin_3);

    while (1)
    {
        // 增加占空比，加速电机
        for (uint16_t i = 0; i <= PWM_PERIOD; i++)
        {
            TIM_SetCompare1(TIM3, i);
            TIM_SetCompare2(TIM3, i);

            Delay(20000);
        }

        // 减小占空比，减速电机
        for (uint16_t i = PWM_PERIOD; i >= 0; i--)
        {
            TIM_SetCompare1(TIM3, i);
            TIM_SetCompare2(TIM3, i);

            Delay(20000);
        }
    }
}

void PWM_Init(void)
{
    TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
    TIM_OCInitTypeDef TIM_OCInitStructure;

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);

    TIM_TimeBaseStructure.TIM_Period = PWM_PERIOD - 1;
    TIM_TimeBaseStructure.TIM_Prescaler = 83;
    TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;

    TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);

    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_OC1Init(TIM3, &TIM_OCInitStructure);
    TIM_OC2Init(TIM3, &TIM_OCInitStructure);

    TIM_Cmd(TIM3, ENABLE);
}

void GPIO_Init(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);

    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

    GPIO_Init(GPIOB, &GPIO_InitStructure);
}

void Delay(uint32_t nCount)
{
    while (nCount--)
    {
    }
}

需要注意的是，这只是一个简单的示例程序，可能需要根据具体的硬件和需求进行修改。同时，还需要根据L298N芯片的数据手册来配置控制信号的电平和占空比等参数。