micropython 步进电机控制的代码怎么写？

以下是一个使用 Micropython 控制步进电机的示例代码：

from machine import Pin
import time

# 定义步进电机的引脚
coil_A_1_pin = Pin(12, Pin.OUT)
coil_A_2_pin = Pin(14, Pin.OUT)
coil_B_1_pin = Pin(13, Pin.OUT)
coil_B_2_pin = Pin(15, Pin.OUT)

# 定义步进电机的步进模式
StepCount = 8
Seq = list(range(0, StepCount))
Seq[0] = [1,0,0,0]
Seq[1] = [1,1,0,0]
Seq[2] = [0,1,0,0]
Seq[3] = [0,1,1,0]
Seq[4] = [0,0,1,0]
Seq[5] = [0,0,1,1]
Seq[6] = [0,0,0,1]
Seq[7] = [1,0,0,1]

# 定义步进电机的旋转方向
StepDir = 1

# 定义步进电机的步进速度
StepDelay = 0.01

# 定义步进电机的步数
StepCounter = 0

# 控制步进电机旋转
while True:
    for pin in range(0, 4):
        xpin = Seq[StepCounter][pin]
        if xpin:
            if pin == 0:
                coil_A_1_pin.value(1)
            elif pin == 1:
                coil_A_2_pin.value(1)
            elif pin == 2:
                coil_B_1_pin.value(1)
            elif pin == 3:
                coil_B_2_pin.value(1)
        else:
            if pin == 0:
                coil_A_1_pin.value(0)
            elif pin == 1:
                coil_A_2_pin.value(0)
            elif pin == 2:
                coil_B_1_pin.value(0)
            elif pin == 3:
                coil_B_2_pin.value(0)

    StepCounter += StepDir

    if (StepCounter >= StepCount):
        StepCounter = 0
    if (StepCounter < 0):
        StepCounter = StepCount + StepDir

    time.sleep(StepDelay)

这段代码使用了 Micropython 的 machine 模块来控制步进电机的引脚，定义了步进电机的步进模式、旋转方向、步进速度和步数，然后通过循环控制步进电机的旋转。