仿照Arduino的millis構造非阻塞時間輪片的C51單片機程序

ID:137736 · 發(fā)表于 2022-10-31 16:17

Arduino的millis函數(shù)使用起來很方便。用普中開發(fā)板寫的程序，仿照Arduino,實現(xiàn)非阻塞、時間輪片多任務。
/*模仿Arduino的millis構造非阻塞時間輪片程序*/
#include <STC90C5xAD.H>
#define u8 unsigned char
#define u16 unsigned int
#define u32 unsigned long
sbit LED1 = P0^0;
sbit LED2 = P0^1;
sbit LED3 = P0^2;
u32 millis = 0;                               //ms定時計數(shù)，長57天
const u16 timeLong1 = 1000;
const u16 timeLong2 = 2000;
u32 previousMillis1 = 0;
u32 previousMillis2 = 0;
u32 previousMillis3 = 0;
void InitTimer0(void);
void main (void)
{
      InitTimer0();
      while(1)
      {
            if (millis - previousMillis1 >= timeLong1)       //現(xiàn)在時間-以前時間
            {
                     previousMillis1 = millis;                               //現(xiàn)在時間賦值以前時間變量
                     LED1 =~LED1;
            }

            if (millis - previousMillis2 >= timeLong2)
            {
                     previousMillis2 = millis;
                     LED2 =~LED2;
            }
         if (millis - previousMillis3 >= timeLong1)
            {
                     previousMillis3 = millis;
                     LED3 =~LED3;
            }

      }

}

void InitTimer0(void)       //22.1M晶振定時器0的1ms初始化
{
      TMOD = 0x01;
TH0 = 0x0F8;
TL0 = 0x0CD;
EA = 1;
ET0 = 1;
TR0 = 1;
}

void Timer0Int(void) interrupt 1       //定時器中斷，millis計數(shù)加1
{
      TH0 = 0x0F8;
TL0 = 0x0CD;
      millis++;
      if(millis>0xfffffffa)
      {
      millis = 0;
      previousMillis1 = 0;
      previousMillis2 = 0;
      }

}