在stm32103f中实现28byj-48步进电机控制的代码

以下是一个简单的代码示例，用于在STM32F103中控制28BYJ-48步进电机：

#include "stm32f10x.h"

#define STEPPER_PORT    GPIOA
#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

// 步进电机的状态
uint8_t stepper_states[4] = {0x01, 0x02, 0x04, 0x08};
uint8_t current_state = 0;

void stepper_init(void) {
    GPIO_InitTypeDef GPIO_InitStructure;

    // 初始化GPIO
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);

    GPIO_InitStructure.GPIO_Pin = STEPPER_PIN_1 | STEPPER_PIN_2 | STEPPER_PIN_3 | STEPPER_PIN_4;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(STEPPER_PORT, &GPIO_InitStructure);
}

void stepper_step(uint8_t direction) {
    // 计算下一个状态
    if (direction == 0) {
        current_state = current_state + 1;
    } else {
        current_state = current_state - 1;
    }

    // 如果超出状态数组范围，则重新从0开始
    if (current_state > 3) {
        current_state = 0;
    } else if (current_state < 0) {
        current_state = 3;
    }

    // 更新GPIO输出状态
    GPIO_WriteBit(STEPPER_PORT, STEPPER_PIN_1, (stepper_states[current_state] & 0x01));
    GPIO_WriteBit(STEPPER_PORT, STEPPER_PIN_2, (stepper_states[current_state] & 0x02));
    GPIO_WriteBit(STEPPER_PORT, STEPPER_PIN_3, (stepper_states[current_state] & 0x04));
    GPIO_WriteBit(STEPPER_PORT, STEPPER_PIN_4, (stepper_states[current_state] & 0x08));
}

int main(void) {
    stepper_init();

    // 步进电机顺时针旋转
    for (int i = 0; i < 2048; i++) {
        stepper_step(0);
        for (int j = 0; j < 1000; j++);
    }

    // 步进电机逆时针旋转
    for (int i = 0; i < 2048; i++) {
        stepper_step(1);
        for (int j = 0; j < 1000; j++);
    }

    while (1);

    return 0;
}

这段代码可以让步进电机顺时针旋转2048步，然后逆时针旋转2048步。如果需要控制步进电机旋转的速度和精度，可以根据实际情况进行调整。