- #include <reg52.h>
- #define uchar unsigned char
- long g_Beats = 0;
- void Timer0Init();
- void TurnMotor(long angle);
- void main()
- {
- Timer0Init();
- TurnMotor(360);
- while(1);
- }
- void Timer0Init()
- {
- TMOD |= 0x01;
- TH0 = 0xFC; //定时1个MS;
- TL0 = 0x66;
- EA = 1;
- ET0 = 1;
- TR0 = 1;
- }
- void TurnMotor(long angle)
- {
- EA = 0;
- g_Beats = (angle * 4076) / 360;
- EA = 1;
- }
- void Timer0IRQ() interrupt 1
- {
- static uchar index = 0;
- uchar temp;
- uchar code BeatCode[8] = {0x01,0x03,0x02,0x06,
- 0x04,0x0C,0x08,0x09};
- TH0 = 0xFC;
- TL0 = 0x66;
-
- if (g_Beats != 0)
- {
- temp = P1; //用temp暂存P1口的值
- temp = temp & 0xF0; //只对P1口的低四位进行操作，要保护好高四位
- P1 = temp | BeatCode[index]; //把节拍数送到P1口的低四位
- index++;
- index &= 0x07; //8个节拍后重新归0；
- g_Beats--; //节拍数递减1；
- }
- else
- P1 |= 0x0F; //节拍数等于零时，关闭步进电机。
-
- }
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