基于STC89C52RC 51单片机实现多任务处理

先上代码，有空在空说明。

#include 


#define W_SIG      0x01              
#define W_TMO      0x02              
#define W_IVL      0x80              
#define SIG_EVENT  0x04              
extern unsigned char Os_create_task     (unsigned char task_id);
extern unsigned char os_wait           (unsigned char typ,unsigned char ticks);

void start_task(void) _task_ 0  
{
  init();
  os_wait(W_TMO, 200);//延时2秒
  Os_create_task(1);
  Os_create_task(2);
  Os_create_task(3);
	while (1)  
	{
    SendString("执行任务0rn");
	}
}

void OStask1(void) _task_ 1
{
	while (1)  
	{
       SendString("执行任务1rn");
	}
}


void OStask2(void) _task_ 2
{ 
	while(1)
	{
       SendString("执行任务2rn");
       RUNLED=~RUNLED;
	}
}

void OStask3(void) _task_ 3
{
	while (1)  
	{
     SendString("执行任务3rn");
     KM=~KM;
     if(KM==0)
       {
        SendString("继电器吸合rn");
       }
       else SendString("继电器断开rn");
	}
}

#include 

#include "intrins.h"

//全局变量定义
#define uchar unsigned char
#define uint unsigned int

sfr AUXR        =   0x8e;

typedef unsigned char BYTE;
typedef unsigned int WORD;

#define FOSC 11059200L      //System frequency
#define BAUD 115200       //UART baudrate


#define NONE_PARITY     0   //None parity
#define ODD_PARITY      1   //Odd parity
#define EVEN_PARITY     2   //Even parity
#define MARK_PARITY     3   //Mark parity
#define SPACE_PARITY    4   //Space parity
#define PARITYBIT NONE_PARITY   //Testing even parity
bit busy;

void init()
{
		#if (PARITYBIT == NONE_PARITY)
    SCON = 0x50;            //8-bit variable UART
    #elif (PARITYBIT == ODD_PARITY) || (PARITYBIT == EVEN_PARITY) || (PARITYBIT == MARK_PARITY)
    SCON = 0xda;            //9-bit variable UART, parity bit initial to 1
    #elif (PARITYBIT == SPACE_PARITY)
    SCON = 0xd2;            //9-bit variable UART, parity bit initial to 0
    #endif

    TL2 = RCAP2L = (65536-(FOSC/32/BAUD)); //Set auto-reload vaule
    TH2 = RCAP2H = (65536-(FOSC/32/BAUD)) >> 8;
    T2CON = 0x34;           //Timer2 start run
    ES = 1;                 //Enable UART interrupt
    EA = 1;                 //Open master interrupt switch
}


void SendData(BYTE dat)
{
    while (busy);           //Wait for the completion of the previous data is sent
    ACC = dat;              //Calculate the even parity bit P (PSW.0)
    if (P)                  //Set the parity bit according to P
    {
#if (PARITYBIT == ODD_PARITY)
        TB8 = 0;            //Set parity bit to 0
#elif (PARITYBIT == EVEN_PARITY)
        TB8 = 1;            //Set parity bit to 1
#endif
    }
    else
    {
#if (PARITYBIT == ODD_PARITY)
        TB8 = 1;            //Set parity bit to 1
#elif (PARITYBIT == EVEN_PARITY)
        TB8 = 0;            //Set parity bit to 0
#endif
    }
    busy = 1;
    SBUF = ACC;             //Send data to UART buffer
}


void SendString(char *s)
{
    while (*s)              //Check the end of the string
    {
       SendData(*s++);     //Send current char and increment string ptr
    }
}

//串口接收数据处理
void Uart_Isr() interrupt 4
{
    if (RI)
    {
     RI = 0;
	  }
    if (TI)
    {
      TI = 0;             //Clear transmit interrupt flag
      busy = 0;           //Clear transmit busy flag
    }
}

#ifndef __AHPHONG_H__
#define __AHPHONG_H__
#include 
#ifndef RAND_MAX
#define RAND_MAX  32767u
#endif

#define true  1;
#define false 0;

sbit RUNLED = P1^6;//RUN_LED输出脚
sbit KM = P2^4;    //继电器输出脚

//全局变量定义
extern void init(void);
void SendString(char *s);

#endif