Arduino的millis函數使用起來很方便。用普中開發板寫的程序，仿照Arduino,實現非阻塞、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，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) //現在時間-以前時間
{
previousMillis1 = millis; //現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計數加1
{
TH0 = 0x0F8;
TL0 = 0x0CD;
millis++;
if(millis>0xfffffffa)
{
millis = 0;
previousMillis1 = 0;
previousMillis2 = 0;
}
}
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