基于STC8G1K08A，写一个A4988驱动用电位器控制步进电机速度，按键控制方向的程序

以下是基于STC8G1K08A的A4988驱动用电位器控制步进电机速度，按键控制方向的程序：

#include <STC8.H>

#define A4988_DIR P1_0
#define A4988_STEP P1_1
#define A4988_MS1 P1_2
#define A4988_MS2 P1_3
#define A4988_MS3 P1_4
#define LED P1_5
#define KEY P3_2
#define POT P3_3

bit dir = 0;

void delay(unsigned int t) {
    unsigned int i, j;
    for (i = 0; i < t; i++) {
        for (j = 0; j < 100; j++);
    }
}

void A4988_init() {
    A4988_DIR = 0;
    A4988_STEP = 0;
    A4988_MS1 = 1;
    A4988_MS2 = 1;
    A4988_MS3 = 1;
}

void A4988_step() {
    A4988_STEP = 1;
    delay(10);
    A4988_STEP = 0;
    delay(10);
}

void A4988_set_speed(unsigned int speed) {
    unsigned int delay_time = 10000 / speed;
    while (1) {
        A4988_step();
        delay(delay_time);
    }
}

void main() {
    unsigned int pot_value = 0;
    unsigned int speed = 0;
    bit key_press = 0;
    A4988_init();
    while (1) {
        pot_value = ADC_CONTR = 0x90;
        pot_value = ((unsigned int)ADC_RES << 2) | (ADC_RESL & 0b00000011);
        speed = pot_value * 2;
        A4988_set_speed(speed);
        if (KEY == 0) {
            if (key_press == 0) {
                key_press = 1;
                dir = !dir;
                A4988_DIR = dir;
            }
        } else {
            key_press = 0;
        }
    }
}

该程序使用了STC8G1K08A的ADC模块读取电位器的值，将其作为步进电机的速度。同时，通过按键控制步进电机的方向。程序中使用了延时函数来控制步进电机的速度，可以根据具体的步进电机参数进行调整。