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在原有的单片机交通灯控制基础上加上RTX51 Tiny实时操作系统，使得系统更具有实时性。
RTX51 Tiny是一种实时操作系统（RTOS），可以用它来建立多个任务（函数）同时执行的应用。嵌入式应用系统经常有这种需求。RTOS可以提供调度、维护、同步等功能。
实时操作系统能灵活的调度系统资源，像CPU和存储器，并且提供任务间的通信。RTX51 Tiny是一个功能强大的RTOS，且易于使用，它用于8051系列的微控制器。
RTX51 Tiny的程序用标准的C语言构造，由Keil C51 C编译器编译。用户可以很容易的定义任务函数，而不需要进行复杂的栈和变量结构配置，只需包含一个指定的头文件。
Altium Designer画的PCB和原理图:
本帖在原有的交通灯设计上加以改进为基于51tiny的交通灯设计，模拟十字路口交通灯包括时间显示和指示灯，并且可以通过按键设置模式和定时时间源码如下：
#include "stc12c5a60s2.h"
#include "rtx51tny.h"
#define uchar unsigned char
#define uint unsigned int
uchar smg[6] = {10, 10, 10, 10, 10, 10};
uchar code table1[12] = {0x77, 0x42, 0x3e, 0x5e, 0x4b, 0x5d, 0x7d, 0x46, 0xff, 0x5f, 0x00, 0x08};
uchar code table2[6] = {0xf5, 0xed, 0xdd, 0xbd, 0xfc,0x7d};
bit busy = 0; //忙标志位
uchar nb = 29; //南北时间
uchar dx = 29; //东西时间
uchar bx = 1; //南北灯切换标志
uchar bx1 = 1; //东西灯切换标志
uchar led[8] = {1,1,1,1,1,1,1,1};
uchar sw = 0; //界面切换标志
uchar turn = 10; //转弯时间
uchar nb1 = 30;
uchar dx1 = 30;
//创建任务
void Main_task(void) _task_ 0
{
P0 = 0x00;
//P10 = 1;
//P10 = 0;
//P2 = 0x00;
//P0 = 0xff;
//P2 = 0x80;
//P2 = 0x00;
os_create_task(1);
os_create_task(2);
os_create_task(3);
os_create_task(4);
os_create_task(5);
os_delete_task(0);
}
//数码管
void Smg_task(void) _task_ 1
{
static uchar i = 0;
while (1)
{
if (!busy)
{
busy = 1;
P1 = table2[ i];
P0 = table1[smg[ i]];
P12 = 1;
P12 = 0;
busy =0;
i++;
i %= 6;
}
os_wait2(K_TMO, 40);
}
}
//LED
void Led_task(void) _task_ 2
{
uchar i = 0;
while (1)
{
if (!busy)
{
busy = 1;
P11 = 1;
P00 = led[0];
P01 = led[1];
P02 = led[2];
P03 = led[3];
P04 = led[4];
P05 = led[5];
P06 = led[6];
P07 = led[7];
P11 = 0;
busy = 0;
}
if(sw == 2)
{
led[2] = !led[2];
led[6] = !led[6];
for (i=0; i<30; i++)
os_wait2(K_TMO, 200);
}
for (i=0; i<20; i++)
os_wait2(K_TMO, 200);
}
}
//按键
uchar Scan_Key3(void)
{
uchar value = 20;
if (P32 == 0)
{
value = 1;
}
if (P33 == 0)
{
value = 2;
}
if (P34 == 0)
{
value = 3;
}
return value;
}
//红绿灯路口
void display_task(void) _task_ 3
{
uchar i;
while(1)
{
if (!sw)
{
smg[0] = nb / 10;
smg[1] = nb % 10;
smg[2] = dx / 10;
smg[3] = dx % 10;
if (nb >= 6 && nb == 1)
{
led[0] = 0;
P30 = 0;
}
if(nb >= 6 && nb == 0)
{
if (nb < 15 && nb > 5)
{
led[3] = 0;
}
led[1] = 0;
P31 = 0;
}
if (nb < 5)
{
led[3] = 1;
}
if(nb < 6 && nb >= 0 && bx == 1)
{
led[2] = 0;
led[0] = 1;
led[1] = 1;
led[3] = 1;
}
if (nb == 0 || nb > dx1)
{
nb = nb1;
if (bx == 1)
{
led[1] = 0;
led[0] = 1;
led[2] = 1;
P30 = 1;
bx = 0;
}
else
{
led[0] = 0;
led[1] = 1;
led[2] = 1;
led[3] = 1;
P31 = 1;
bx = 1;
}
}
if (dx >= 6 && bx1 == 0)
{
led[4] = 0;
P36 = 0;
}
if(dx >= 6 && bx1 == 1)
{
if (dx < 15 && dx > 5)
{
led[7] = 0;
}
led[5] = 0;
P37 = 0;
}
if (dx < 5)
{
led[7] = 1;
}
if(dx < 6 && dx >= 0 && bx1 == 0)
{
led[6] = 0;
led[4] = 1;
led[5] = 1;
led[7] = 1;
}
if (dx == 0 || dx > dx1)
{
dx = dx1;
if (bx1 == 0)
{
led[5] = 0;
led[6] = 1;
led[7] = 1;
led[4] = 1;
P36 = 1;
bx1 = 1;
}
else
{
led[4] = 0;
led[6] = 1;
led[7] = 1;
led[5] = 1;
P37 = 1;
bx1 = 0;
}
}
dx--;
nb--;
for (i=0; i<50; i++)
os_wait2(K_TMO, 200);
}
}
}
void Key_task(void) _task_ 4
{
uchar value;
static uchar key_value[4] = {11, 11, 11, 11};
static uchar j = 0;
while (1)
{
value = Scan_Key3();
if (value != 20)
{
while(Scan_Key3() != 20);
switch (value)
{
//设置:界面切换
case 1:
sw++;
if (sw == 1)
{
for(j = 0; j < 8;j++)
{
led[j] = 1;
}
led[2] = 0;
led[6] = 0;
}
if (sw == 2)
{
;
}
if (sw == 3)
{
led[2] = 1;
led[6] = 1;
led[1] = led[5] = 0;
}
if (sw == 4)
{
led[1] = led[5] = 1;
led[0] = led[4] = 0;
}
if (sw == 5)
{
led[0] = 1;
led[4] = 1;
key_value[0] = dx1 / 10;
key_value[1] = dx1 % 10;
key_value[2] = nb1 / 10;
key_value[3] = nb1 % 10;
}
if (sw == 6)
{
//dx = 0;
//nb = 0;
//dx1 = 0;
//nb1 = 0;
sw = 0;
led[2] = 1;
//key_value[0] = key_value[1] = key_value[2] = key_value[3] =11;
//smg[1] = smg[2] = smg[3] = smg[4] = smg[6] = smg[7] = 10;
}
break;
case 2:
if (sw == 5){
dx1++;
nb1++;
if (nb1 > 30)
{
nb1 = 30;
}
if (dx1 > 30)
{
dx1 = 30;
}
key_value[0] = nb1 / 10;
key_value[1] = nb1 % 10;
key_value[2] = dx1 / 10;
key_value[3] = dx1 % 10;
}
break;
case 3:
if (sw == 5){
dx1--;
nb1--;
if ( dx1 < 1)
{
dx1 = 1;
}
if (nb1 < 1)
{
nb1 = 1;
}
key_value[0] = nb1 / 10;
key_value[1] = nb1 % 10;
key_value[2] = dx1 / 10;
key_value[3] = dx1 % 10;
}
break;
default: break;
}
if (sw){
smg[0] = key_value[0];
smg[1] = key_value[1];
smg[2] = key_value[2];
smg[3] = key_value[3];
}
}
os_wait2(K_TMO, 200);
os_wait2(K_TMO, 200);
os_wait2(K_TMO, 200);
os_wait2(K_TMO, 200);
}
}
void toll_task(void) _task_ 5
{
while(1)
{
smg[4] = (dx1 + 10) / 10;
smg[5] = (dx1 + 10) % 10;
os_wait2(K_TMO, 200);
}
}
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