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随便搜了一下，，这种代码快的起来，实时的起来才怪.....
属于典型莫名其妙地移用 任务链表 的做法
#include
#define MAX_TASKS 5
typedef struct os_task_control_table {
unsigned char os_task_wait_tick;
unsigned char os_task_stack_top;
}TCB;
volatile unsigned char int_count;
volatile unsigned char os_en_cr_count;
#define enter_int() EA=0;int_count++;
#define os_enter_critical() EA=0;os_en_cr_count++;
#define os_exit_critical() if(os_en_cr_count>=1){os_en_cr_count--;if(os_en_cr_count==0)EA=1;}
unsigned char code os_map_tbl[] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80};
volatile unsigned char os_task_int_tbl;
idata volatile TCB os_tcb[MAX_TASKS];
volatile unsigned char os_task_running_id;
volatile unsigned char os_task_rdy_tbl;
unsigned char idata os_task_stack[MAX_TASKS][20];
void os_init(void);
void os_task_create(unsigned char task_id ,unsigned int task_point,unsigned char stack_point);
void os_delay(unsigned char ticks);
void os_start(void);
void os_task_switch(void);
void exit_int(void);
void os_init(void) {
EA = 0;
ET2 = 1;
T2CON = 0X00;
T2MOD = 0X00;
RCAP2H = 0x0D8;
RCAP2L = 0x0F0;
os_task_rdy_tbl = 0;
os_task_int_tbl = 0xff;
int_count = 0;
os_en_cr_count = 0;
}
void os_task_create(unsigned char task_id ,unsigned int task_point,unsigned char stack_point) {
os_enter_critical();
((unsigned char idata *)stack_point)[0] = task_point;
((unsigned char idata *)stack_point)[1] = task_point>>8;
os_tcb[task_id].os_task_stack_top = stack_point+14;
os_task_rdy_tbl |= os_map_tbl[task_id];
os_tcb[task_id].os_task_wait_tick = 0;
os_exit_critical();
}
void os_delay(unsigned char ticks) {
os_enter_critical();
os_tcb[os_task_running_id].os_task_wait_tick = ticks;
os_task_rdy_tbl &= ~os_map_tbl[os_task_running_id];
os_exit_critical();
os_task_switch();
}
void os_start(void) {
os_task_running_id = 0;
os_tcb[os_task_running_id].os_task_stack_top -= 13;
EA = 1;
SP = os_tcb[os_task_running_id].os_task_stack_top;
TR2 = 1;
}
void os_task_switch(void) {
unsigned char i;
EA = 0;
os_tcb[os_task_running_id].os_task_stack_top = SP;
os_task_int_tbl &= ~os_map_tbl[os_task_running_id];
for(i=0; i
if(os_task_rdy_tbl&os_map_tbl) {
break;
}
}
os_task_running_id = i;
SP = os_tcb[os_task_running_id].os_task_stack_top;
if(os_task_int_tbl&os_map_tbl[os_task_running_id]) {
__asm POP 7
__asm POP 6 //恢复任务寄存器
__asm POP 5
__asm POP 4
__asm POP 3
__asm POP 2
__asm POP 1
__asm POP 0
__asm POP PSW
__asm POP DPL
__asm POP DPH
__asm POP B
__asm POP ACC
}
EA = 1;
__asm RETI
}
void exit_int(void) {
unsigned char i;
SP -= 2;
if(--int_count == 0) {
os_tcb[os_task_running_id].os_task_stack_top = SP;
os_task_int_tbl |= os_map_tbl[os_task_running_id];
for(i=0; i
if(os_task_rdy_tbl&os_map_tbl) {
break;
}
}
os_task_running_id = i;
SP = os_tcb[os_task_running_id].os_task_stack_top;
if(os_task_int_tbl&os_map_tbl[os_task_running_id]) {
__asm POP 7
__asm POP 6 //恢复任务寄存器
__asm POP 5
__asm POP 4
__asm POP 3
__asm POP 2
__asm POP 1
__asm POP 0
__asm POP PSW
__asm POP DPL
__asm POP DPH
__asm POP B
__asm POP ACC
}
EA = 1;
__asm RETI
}
__asm POP 7
__asm POP 6 //恢复任务寄存器
__asm POP 5
__asm POP 4
__asm POP 3
__asm POP 2
__asm POP 1
__asm POP 0
__asm POP PSW
__asm POP DPL
__asm POP DPH
__asm POP B
__asm POP ACC
EA=1;
__asm RETI
}
void timer2_isr(void) interrupt 5 {
unsigned char i;
TF2=0;
enter_int();
for(i=0; i
if(os_tcb.os_task_wait_tick) {
os_tcb.os_task_wait_tick--;
if(os_tcb.os_task_wait_tick == 0) {
os_task_rdy_tbl |= os_map_tbl;
}
}
}
exit_int();
}
void task_0(void) {
while(1) {
}
}
sbit seg2 = P2^5;
sbit seg3 = P2^6;
sbit seg4 = P2^7;
void delay_ms(unsigned int xms){
unsigned int x,y;
for(x=xms; x>0; x--)
for(y=248; y>0; y--);
}
unsigned char code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x40,0};
void task_1(void) {
unsigned char gw,sw,bw;
while(1) {
bw = os_tcb[2].os_task_wait_tick/100;
sw = os_tcb[2].os_task_wait_tick%100/10;
gw = os_tcb[2].os_task_wait_tick%10;
P0 = table[bw];
seg2=0;
delay_ms(3);
seg2=1;
P0 = table[sw];
seg3=0;
delay_ms(3);
seg3=1;
P0 = table[gw];
seg4=0;
delay_ms(3);
seg4=1;
}
}
void task_2(void) {
unsigned char i;
while(1) {
i++;
P3 = 0x01<<(i%8);
os_delay(200);
}
}
void task_3(void) {
unsigned char i;
while(1) {
i++;
//P2 = 0x01<<(i%8);
os_delay(7);
}
}
void task_4(void) {
unsigned char i;
while(1) {
i++;
P1 = 0x01<<(i%8);
os_delay(10);
}
}
void main(void) {
os_init();
os_task_create(4,(unsigned int)&task_0,(unsigned char)os_task_stack[4]);
os_task_create(3,(unsigned int)&task_1,(unsigned char)os_task_stack[3]);
os_task_create(2,(unsigned int)&task_2,(unsigned char)os_task_stack[2]);
os_task_create(1,(unsigned int)&task_3,(unsigned char)os_task_stack[1]);
os_task_create(0,(unsigned int)&task_4,(unsigned char)os_task_stack[0]);
os_start();
} | 
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