c51实时操作系统（短小精悍）

最新推荐文章于 2025-06-16 11:45:38 发布

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最新推荐文章于 2025-06-16 11:45:38 发布 · 2.5k 阅读

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CC 4.0 BY-SA版权

本文档介绍了一个基于C51的实时操作系统实现，包括任务调度、信号量、超时和时间片轮转等关键功能。通过定义常量和结构体来配置系统参数，并提供了任务创建、等待、清除信号等API函数。

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#include
#include

#define INT_REGBANK 1
#define TIMESHARING 5
#define RTX_STACKFREE 20
#define RTX_MAXTASKN 10
#define RTX_RAMTOP 0xFF
#define INT_CLOCK 10000

#define RTX_TIMESHARING (0 - TIMESHARING)
#define RTX_CLOCK (0 - INT_CLOCK)
#define RTX_REGISTERBANK INT_REGBANK

#define K_SIG 1
#define K_TMO 2
#define SIG_EVENT 4
#define TMO_EVENT 8
#define K_READY 16
#define K_ACTIVE 32
#define K_ROBIN 64
#define K_IVL 128

#define B_WAITSIG 0
#define B_WAITTIM 1
#define B_SIGNAL 2
#define B_TIMEOUT 3
#define B_READY 4
#define B_ACTIVE 5
#define B_ROBIN 6
#define B_INTERVAL 7

idata unsigned char STKP[RTX_MAXTASKN];
idata unsigned char RTX_RobinTime;
idata unsigned char TASK_Current;
idata unsigned char RTX_SAVEPSW;
idata unsigned char RTX_SAVEACC;

bit RTX_TS_REQ=0;
bit RTX_TS_DELAY=0;

idata struct
{
char time;
char st;
}
STATE[RTX_MAXTASKN];

void os_system_init();
unsigned char task_switch();
unsigned char os_system_start();
unsigned char os_delete_task(unsigned char task_no);
unsigned char os_send_signal(unsigned char task_no);
unsigned char isr_send_signal(unsigned char task_no);
unsigned char os_clear_signal(unsigned char task_no);
unsigned char os_wait(unsigned type, unsigned timeout);
unsigned char os_create_task(unsigned int proc_name, unsigned char task_no);

unsigned char task_switch()
{
unsigned char i;
unsigned char next;
unsigned char limit;

SP-=2;

RTX_TS_DELAY=1;

next=TASK_Current;

while(1)
{
if (++next==RTX_MAXTASKN)next=0;
if (STATE[next].st&K_READY)break;
}

while(TASK_Current
{
TASK_Current++;
i=STKP[TASK_Current];

STKP[TASK_Current]=SP;

if(TASK_Current==RTX_MAXTASKN)
{
limit=RTX_RAMTOP;
}
else
{
limit=STKP[TASK_Current+1];
}

while(i!=limit)
{
SP++;
i++;
DBYTE[SP]=DBYTE[i];
}
}

while(TASK_Current>next)
{
if(TASK_Current==RTX_MAXTASKN)
{
i=RTX_RAMTOP;
}
else
{
i = STKP[TASK_Current+1];
}

limit = STKP[TASK_Current];

while(SP!=li