stm32驱动42步进电机

要驱动42步进电机，可以使用STM32的定时器和GPIO模块来实现。以下是一个简单的代码示例：

#include "stm32f10x.h"

#define STEPPER_PIN_1 GPIO_Pin_0
#define STEPPER_PIN_2 GPIO_Pin_1
#define STEPPER_PIN_3 GPIO_Pin_2
#define STEPPER_PIN_4 GPIO_Pin_3

uint16_t steps[] = {0b0001, 0b0010, 0b0100, 0b1000};
int step_index = 0;

void TIM2_IRQHandler(void)
{
    if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
    {
        TIM_ClearITPendingBit(TIM2, TIM_IT_Update);

        GPIO_ResetBits(GPIOB, STEPPER_PIN_1 | STEPPER_PIN_2 | STEPPER_PIN_3 | STEPPER_PIN_4);
        GPIO_SetBits(GPIOB, steps[step_index]);

        step_index++;
        if (step_index >= 4)
        {
            step_index = 0;
        }
    }
}

int main(void)
{
    // Enable the timer clock
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

    // Configure the timer to generate interrupt every 1ms
    TIM_TimeBaseInitTypeDef timerInitStruct;
    timerInitStruct.TIM_Prescaler = 72 - 1;
    timerInitStruct.TIM_CounterMode = TIM_CounterMode_Up;
    timerInitStruct.TIM_Period = 1000 - 1;
    timerInitStruct.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseInit(TIM2, &timerInitStruct);
    TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
    TIM_Cmd(TIM2, ENABLE);

    // Enable the GPIO clock
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);

    // Configure the GPIO pins to output mode
    GPIO_InitTypeDef gpioInitStruct;
    gpioInitStruct.GPIO_Pin = STEPPER_PIN_1 | STEPPER_PIN_2 | STEPPER_PIN_3 | STEPPER_PIN_4;
    gpioInitStruct.GPIO_Mode = GPIO_Mode_Out_PP;
    gpioInitStruct.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(GPIOB, &gpioInitStruct);

    while (1)
    {
        // Do nothing here
    }
}

在上述代码中，我们使用TIM2定时器来生成1ms的中断，并在中断处理函数中控制GPIO输出来驱动42步进电机。通过修改`steps`数组的顺序，可以实现不同的步进模式。