具体操作：启动系统，默认步进电机正转。此时按下sw2，切换到反转；按下sw1可切换回正转；每按一次sw3，就加速一次，直至上限速度；按一次sw4，就减速一次，直到下限速度。 5.2 源程序代码

运行Keil中文版，参照电路图和流程图编写程序

#include

static int speedlevel; 步进电机转速参数，数值越大速度越慢，最小值为1，速度最快

static int spcount; 步进电机转速参数计数

void delay(unsigned int endcount); 延时函数，延时为endcount*0.5毫秒 void gorun(); 步进电机控制步进函数 void main(void) {

count = 0; step_index = 0; spcount = 0; stop_flag = 0; P1_0 = 0; P1_1 = 0; P1_2 = 0; P1_3 = 0;

EA = 1; 允许CPU中断 TMOD = 0x11; 设定时器0和1为16位模式1 ET0 = 1; 定时器0中断允许

TH0 = 0xFE;

TL0 = 0x0C; 设定时每隔0.5ms中断一次 TR0 = 1; 开始计数 turn = 0; speedlevel = 2; delay(10000); speedlevel = 1; do{

speedlevel = 2; delay(10000); speedlevel = 1; delay(10000); stop_flag=1; delay(10000); stop_flag=0; Turn=!turn; }while(1); }

定时器0中断处理

void timeint(void) interrupt 1 {

TH0=0xFE;

TL0=0x0C; 设定时每隔0.5ms中断一次 count++; spcount--;

if(spcount<=0) {

spcount = speedlevel; gorun(); } }

void delay(unsigned int endcount) {

count=0;

do{}while(count

void gorun() {

if (stop_flag==1) {

P1_0 = 0; P1_1 = 0; P1_2 = 0; P1_3 = 0; return; }

switch(step_index) { case 0: 0 P1_0 = 1;

P1_1 = 0; P1_2 = 0; P1_3 = 0; break; case 1: 0、1 P1_0 = 1; P1_1 = 1; P1_2 = 0; P1_3 = 0; break; case 2: 1 P1_0 = 0; P1_1 = 1; P1_2 = 0; P1_3 = 0; break; case 3: 1、2 P1_0 = 0; P1_1 = 1; P1_2 = 1; P1_3 = 0; break; case 4: 2 P1_0 = 0; P1_1 = 0;