operating system is same as ARM controller.but, here we learn about optimization in terms of time,memory,size of the code.reducing one of these will be our main moto

1. Operating systems embedded systems
//LED hardware
#include<lpc214x.h>
#include<rtl.h>
OS_TID t1,t2;
int a=5,b=4,c=0;
__task int task2(int i);
void inittimer0(void);
void delay(void);
__task int task1(void)
{
int i=1;
t1=os_tsk_prio_self(i);
t2=os_tsk_create(task2,i++);
while(1)
{
IOCLR0=0x00FF0000;
delay();

2. os_tsk_prio(t2,i);}
}
void main(void)
{
PINSEL0=0x00000000;
IODIR0=0x00FF0000;
os_sys_init(task1);
while(1);
}
__task int task2(int i)
{
while(1)
{IOSET0=0x00FF0000;
delay();
os_tsk_prio(t1,i++);
return i;}
}

3. void inittimer0(void)
{
T0PR=11999;
T0MR0=1000;
T0MCR=3;
T0TCR=2;
}
void delay(void)
{
inittimer0();
T0TCR=0x01;
while(!(T0IR==0x01));
T0IR=0x01;
}
********************************************
LED hardware
#include<lpc214x.h>
#include<rtl.h>
OS_TID t1,t2;

4. int a=5,b=4,c=0;
__task int task2(int i);
void inittimer0(void);
void delay(void);
__task int task1(void)
{
int i=1;
t1=os_tsk_self();
os_tsk_prio_self(4);
t2=os_tsk_create(task2,4);
while(1)
{
IOCLR0=0x00FF0000;
delay();
os_tsk_prio(t1,4);
//os_tsk_prio(t3,2);
os_tsk_prio(t2,5);}
}
void main(void)

5. {
PINSEL0=0x00000000;
IODIR0=0x00FF0000;
os_sys_init(task1);
while(1);
}
__task int task2(int i)
{
while(1)
{IOSET0=0x00FF0000;
delay();
os_tsk_prio(t2,4);
os_tsk_prio(t1,5);
return i;}
}
void inittimer0(void)
{
T0PR=11999;

6. T0MR0=1000;
T0MCR=3;
T0TCR=2;
}
void delay(void)
{
inittimer0();
T0TCR=0x01;
while(!(T0IR==0x01));
T0IR=0x01;
}
****************************************************
//ts lcd
#include<lpc214x.h>
#include<rtl.h>
OS_TID t1,t2,t3;
int a=2,b=1;
unsigned char e[]= {"bvb"};
unsigned char g[]= {"qwe"};

7. unsigned char h[]= {"asd"};
void cmd (unsigned int);
void data (unsigned int );
void delay (unsigned int ) ;
__task int task2(void);
__task int task3(void);
void seven(unsigned char *d);
__task int task1(void)
{
int i=1;
//t1=os_tsk_prio_self(i);
t1=os_tsk_self();
os_tsk_prio_self(4);
t2=os_tsk_create(task2,4);
t3=os_tsk_create(task3,4);
while(1)
{

8. //d[0]=a+b;
//unsigned char d[]={'BVB'};
seven(e);
delay(100000);
delay(100000);
delay(100000);
delay(100000);
delay(100000);
os_tsk_prio(t1,4);
//os_tsk_prio(t3,2);
os_tsk_prio(t2,5);}
}
void main(void)
{
os_sys_init(task1);
while(1);
}
__task int task2(void)
{

9. while(1)
{ //d[0]=a-b;
// unsigned char d[]={'BVB'};
seven(g);
os_tsk_prio(t2,4);
os_tsk_prio(t3,5);
}
}
__task int task3(void)
{
while(1)
{ // d[0]=a;
//unsigned char d[]={'BVB'};
seven(h);
os_tsk_prio(t3,4);
os_tsk_prio(t1,5);
}
}

10. void seven(unsigned char *d)
{
unsigned int c []= {0x30,0x30,0x20,0X20,0X28,0X01,0X06,0X0e,0X80
};
unsigned int i,j ;
PINSEL0=0X00000000;
IODIR0=0X000000FC;
IOCLR0=0X000000FC;
for (i=0;i<9;i++)
{
cmd (c[i]);
delay (10000);
}
//while (1)
{
cmd(0x80);
//cmd(0xC0); //Second line
delay (65000);
for (j=0; j<3;j++)
{

11. data (d[j]);
delay (65000);
delay (65000);
delay (65000);
delay (65000);
delay (65000);
delay (65000);
delay (65000); delay (65000);
delay (65000);
delay (65000);
//delay (65000);
//delay (65000);
}
cmd(0x01);
delay (5000);
delay (65000);
delay (65000);
}
}

12. void cmd (unsigned int value )
{
unsigned int y;
y=value;
y=y&0xf0;
IOCLR0=0X000000fc;
IOCLR0=0X00000004;
IOSET0=y;
IOSET0=0X00000008;
delay(100);
IOCLR0=0x00000008;
y=value;
y=y & 0x0f;
y=y<<4;
IOCLR0=0x000000FC;
IOCLR0=0X00000004;
IOSET0=y;
IOSET0=0X00000008;
delay(100);
IOCLR0=0x00000008;

13. }
void data (unsigned int d )
{
unsigned int y;
y=d;
y=y&0xf0;
IOCLR0=0X000000fc;
IOSET0=0X00000004;
IOSET0=y;
IOSET0=0x00000008;
delay (100);
IOCLR0=0x00000008;
y=d;
y=y & 0x0f;
y=y<<4;
IOCLR0=0x000000FC;
IOSET0=0X00000004;

14. IOSET0=y;
IOSET0=0X00000008;
delay(100);
IOCLR0=0x00000008;
}
void delay (unsigned int x)
{
unsigned int i;
for (i=0;i<x;i++);
}
******************************************
///ts diff
#include<lpc214x.h>
#include<rtl.h>
OS_TID t1,t2,t3;
int a=2,b=1;

15. unsigned char e[]= {"bvb"};
unsigned char g[]= {"qwe"};
unsigned char h[]= {"asd"};
void cmd (unsigned int);
void data (unsigned int );
void delay (unsigned int ) ;
__task int task2(void);
__task int task3(void);
void seven(unsigned char *d);
void seven2(int c);
void delay2(void) ;
__task int task1(void)
{
int i=1;
//t1=os_tsk_prio_self(i);
t1=os_tsk_self();
os_tsk_prio_self(4);
t2=os_tsk_create(task2,4);

16. t3=os_tsk_create(task3,4);
while(1)
{
//d[0]=a+b;
//unsigned char d[]={'BVB'};
seven(e);
os_tsk_prio(t1,4);
//os_tsk_prio(t3,2);
os_tsk_prio(t2,5);}
}
void main(void)
{
os_sys_init(task1);
while(1);
}
__task int task2(void)
{

17. while(1)
{ //d[0]=a-b;
// unsigned char d[]={'BVB'};
seven2(2);
os_tsk_prio(t2,4);
os_tsk_prio(t3,5);
}
}
__task int task3(void)
{
while(1)
{ // d[0]=a;
//unsigned char d[]={'BVB'};
seven(h);
os_tsk_prio(t3,4);
os_tsk_prio(t1,5);
}
}

18. void seven(unsigned char *d)
{
unsigned int c []= {0x30,0x30,0x20,0X20,0X28,0X01,0X06,0X0e,0X80
};
unsigned int i,j ;
PINSEL0=0X00000000;
IODIR0=0X000000FC;
IOCLR0=0X000000FC;
for (i=0;i<9;i++)
{
cmd (c[i]);
delay (10000);
}
while (1)
{
cmd(0x80);
//cmd(0xC0); //Second line
delay (65000);
for (j=0; j<3;j++)
{
data (d[j]);

19. delay (65000);
delay (65000);
delay (65000);
delay (65000);
delay (65000);
delay (65000);
delay (65000); delay (65000);
delay (65000);
delay (65000);
//delay (65000);
//delay (65000);
}
cmd(0x01);
delay (5000);
delay (65000);
delay (65000);
}
}

20. void cmd (unsigned int value )
{
unsigned int y;
y=value;
y=y&0xf0;
IOCLR0=0X000000fc;
IOCLR0=0X00000004;
IOSET0=y;
IOSET0=0X00000008;
delay(100);
IOCLR0=0x00000008;
y=value;
y=y & 0x0f;
y=y<<4;
IOCLR0=0x000000FC;
IOCLR0=0X00000004;
IOSET0=y;
IOSET0=0X00000008;
delay(100);
IOCLR0=0x00000008;
}

21. void data (unsigned int d )
{
unsigned int y;
y=d;
y=y&0xf0;
IOCLR0=0X000000fc;
IOSET0=0X00000004;
IOSET0=y;
IOSET0=0x00000008;
delay (100);
IOCLR0=0x00000008;
y=d;
y=y & 0x0f;
y=y<<4;
IOCLR0=0x000000FC;
IOSET0=0X00000004;

22. IOSET0=y;
IOSET0=0X00000008;
delay(100);
IOCLR0=0x00000008;
}
void delay (unsigned int x)
{
unsigned int i;
for (i=0;i<x;i++);
}
void seven2(int c)
{
unsigned int
b[]={0x003F0000,0x00060000,0x005B0000,0x004F0000,0x00660000,
0x006D0000,0x007D0000,0x00070000,0x007F0000,0x006F0000};
PINSEL0=0x00000000;
PINSEL1=0x00000000;

23. IODIR0=0x30FF0000;
IOCLR0=0x00000000;
IOSET0=0x20000000;
IOSET0=b[c];
delay2();
IOCLR0=0x00FF0000;
delay2();
}
void delay2()
{
unsigned int i;
for(i=0;i<500000;i++)
{
for(i=0;i<900000;i++);
}
}
**************************************************
//lcd event

24. #include<lpc214x.h>
#include<rtl.h>
OS_TID t1,t2,t3;
int a=2,b=1;
unsigned char e[]= {"abc"};
unsigned char g[]= {"bbb"};
unsigned char h[]= {"ppp"};
void cmd (unsigned int);
void data (unsigned int );
void delay (unsigned int );
__task void task2(void);
__task void task3(void);
void seven(unsigned char *d);
__task void task1(void)
{
t1=os_tsk_self();
os_tsk_prio_self(4);

25. //t1=os_tsk_self();
t2=os_tsk_create(task2,3);
//os_evt_set(0x0003,t2);
while(1)
{
os_evt_wait_or(0x0001,0x0030);
{
seven(e);
}
os_evt_set(0x0002,t2);
}
}
void main(void)
{
os_sys_init(task1);
while(1);
}
__task void task2(void)
{

26. t3=os_tsk_create(task3,2);
while(1)
{
os_evt_wait_or(0x0002,0x0030);
{
seven(g);
}
os_evt_set(0x0003,t3);
}
}
__task void task3(void)
{
while(1)
{
os_evt_wait_or(0x0003,0x0030);
{
seven(h);
}
os_evt_set(0x0001,t1);
}

27. }
void seven(unsigned char *d)
{
unsigned int c []= {0x30,0x30,0x20,0X20,0X28,0X01,0X06,0X0e,0X80
};
unsigned int i,j ;
PINSEL0=0X00000000;
IODIR0=0X000000FC;
IOCLR0=0X000000FC;
for (i=0;i<9;i++)
{
cmd (c[i]);
delay (10000);
}
//while (1)
{
cmd(0x80);
//cmd(0xC0); //Second line
delay (65000);
for (j=0; j<3;j++)

28. {
data (d[j]);
delay (65000);
delay (65000);
delay (65000);
delay (65000);
delay (65000);
delay (65000);
delay (65000); delay (65000);
delay (65000);
delay (65000);
//delay (65000);
//delay (65000);
}
cmd(0x01);
delay (5000);
delay (65000);
delay (65000);
}

29. }
void cmd (unsigned int value )
{
unsigned int y;
y=value;
y=y&0xf0;
IOCLR0=0X000000fc;
IOCLR0=0X00000004;
IOSET0=y;
IOSET0=0X00000008;
delay(100);
IOCLR0=0x00000008;
y=value;
y=y & 0x0f;
y=y<<4;
IOCLR0=0x000000FC;
IOCLR0=0X00000004;
IOSET0=y;
IOSET0=0X00000008;
delay(100);

30. IOCLR0=0x00000008;
}
void data (unsigned int d )
{
unsigned int y;
y=d;
y=y&0xf0;
IOCLR0=0X000000fc;
IOSET0=0X00000004;
IOSET0=y;
IOSET0=0x00000008;
delay (100);
IOCLR0=0x00000008;
y=d;
y=y & 0x0f;
y=y<<4;
IOCLR0=0x000000FC;
IOSET0=0X00000004;

31. IOSET0=y;
IOSET0=0X00000008;
delay(100);
IOCLR0=0x00000008;
}
void delay (unsigned int x)
{
unsigned int i;
for (i=0;i<x;i++);
}
**********************************************