LABORATORY MANUAL EMBEDDED SYSTEMS LABORATORY. M. Tech I Year I Sem R15 DEPARTMENT OF ELECTRONICS & COMMUNICATION ENGG.

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1 LABORATORY MANUAL EMBEDDED SYSTEMS LABORATORY M. Tech I Year I Sem R15 DEPARTMENT OF ELECTRONICS & COMMUNICATION ENGG. BALAJI INSTITUTE OF TECHNOLOGY & SCIENCE Laknepally, Narsampet, Warangal

2 LIST OF EXPERIMENTS Note: Minimum of 10 Experiments have to be conducted 1. Write a simple program to print hello world 2. Write a simple program to show a delay. 3. Write a loop application to copy values from P1 to P2 4. Write a c program for counting the no of times that a switch is pressed & released. 5. Illustrate the use of port header file (port M) using an interface consisting of a keypad and liquid crystal display. 6. Write a program to create a portable hardward delay. 7. Write a c program to test loop time outs. 8. Write a c program to test hardware based timeout loops. 9. Develop a simple EOS showing traffic light sequencing. 10. Write a program to display elapsed time over RS-232 link. 11. Write a program to drive SEOS using Timer Develop software for milk pasteurization system.

3 1. Write a simple program to print hello world #include <lpc214x.h> #define rs 0x #define en 0x void delay_ms(unsigned int t) unsigned int i; for(;t>0;t--) for(i=0;i<13000;i++); void cmd(unsigned char x) unsigned int y; y = x<<18; IOPIN1 = IOPIN1 & 0xFC00FFFF; IOPIN1 = IOPIN1 y; IOCLR1 = rs; IOSET1 = en; delay_ms(10); IOCLR1 = en; delay_ms(10); void lcd_disp(unsigned char x) unsigned int y; y = x<<18;

4 IOPIN1 = IOPIN1 & 0xFC00FFFF; IOPIN1 = IOPIN1 y; IOSET1 = rs; IOSET1 = en; delay_ms(10); IOCLR1 =en; delay_ms(10); void disp_str(unsigned char *x) while(*x) lcd_disp(*x++); void lcdinit() IODIR1=0x03FF0000; cmd(0x38); cmd(0x01); cmd(0x06); cmd(0x0c); cmd(0x80); int main() IODIR0=0xffffffff; lcdinit(); while(1) cmd(0x80); disp_str("hello world");

5 2. Write a simple program to show a delay. #include <lpc214x.h> #define led1 0x // declare led1 is p0.0 #define led2 0x // declare led2 is p0.1 unsigned char x; void delay_ms(unsigned int t) // delay functiobn unsigned int i; for(;t>0;t--) for(i=0;i<5000;i++); // int main() IODIR0=0x ; // declare p0.1 to p0.2 as output pis for leds while(1) // continuous loop IOSET0 =led1; IOSET0 =led2; delay_ms(1000); // upto 1 sec leds are on(1000= 1 sec, if u want 2 sec delay then 2000) IOCLR0 =led1; IOCLR0 =led2; delay_ms(1000); // upto 1 sec leds are off

6 3. Write a loop application to copy values from P1 to P2 #include <lpc214x.h> unsigned char x; unsigned int y; int main() IODIR0=0x ; // declare p0 as input IODIR0=0xffff0000; // declare p as output while(1) // continuous loop x='w'; y = x<<16; // single char 'w' transfer to x variable // valur transfer from p0.16 pin to p0.23(8 bit dat) IOPIN0 = IOPIN0 & 0x ; // first clear the all pins that's why we are using and(&) opration with zeros IOPIN0 = IOPIN0 y; // value transfer to port 0 IOPIN1 = IOPIN1 & 0x ; // first clear the all pins that's why we are using and(&) opration with zeros IOPIN1 = IOPIN0 ; // value transfer to port 0 to port1

7 4. Write a c program for counting the no of times that a switch is pressed & released. #include <lpc214x.h> #define sw 1<<0 // p0.0 connected to switch unsigned int pc,rc; //pc= pressed count, rc= released count variables unsigned char x; int main() IODIR0=0x ; // declare p0 as input while(1) // continuous loop x=iopin0; // read input value from switch x=x&0x ; // if input signal is high that signal & with 1 then output is '1' otherwise '0' if(x==0x ) // switch is pressed signal is high then enter this loop while(x==0x ); // wait until switch is released pc++; // increment the pressed count else if(x==0x ) while(x==0x ); // wait until switch is pressed rc++; // increment the released count

8 5. Illustrate the use of port header file (port M) using an interface consisting of a keypad and liquid crystal display. #include <LPC214X.H> #include "lcd.h" #include "keypad.h" unsigned char arr[4]; int main() IODIR0=0xfff000ff; // declare col as inputs and row as outputs lcdinit(); while(1) to array cmd(0x80); // lcd 1st row display address disp_str("enter VALUES "); cmd(0xc0); // lcd 2 nd row display address for(i=0;i<4;i++) // ENTER 4 VALUES arr[i]=get_key(); // read value from keypad and assign lcd_disp(arr[i]); // display value in array #define C1 0x //p0.17v col 1 #define C2 0x //p0.18 col 2 #define C3 0x //p0.19 col 3 #define RowA 0x //p0.20 #define RowB 0x //p0.21 #define RowC 0x //p0.22 #define RowD 0x //p0.23 unsigned char key,ch; unsigned int i,j; void dela(int x); void Return(void) cmd(0x02); dela(1500); //Return to 0 location on LCD

9 char READ_SWITCHES(void) IO0CLR =RowA;IO0SET =RowB;IO0SET =RowC;IO0SET =RowD; //Test Row A if (!(IOPIN0&=C1)) dela(100); while (!(IOPIN0&=C1)); return '1'; IO0CLR =RowA;IO0SET =RowB;IO0SET =RowC;IO0SET =RowD; if (!(IOPIN0&=C2)) dela(100); while (!(IOPIN0&=C2)); return '2'; IO0CLR =RowA;IO0SET =RowB;IO0SET =RowC;IO0SET =RowD; if (!(IOPIN0&=C3)) dela(100); while (!(IOPIN0&=C3)); return '3'; IO0CLR =RowB;IO0SET =RowA;IO0SET =RowC;IO0SET =RowD; //Test Row B if (!(IOPIN0&=C1)) dela(100); while (!(IOPIN0&=C1)); return '4'; IO0CLR =RowB;IO0SET =RowA;IO0SET =RowC;IO0SET =RowD; if (!(IOPIN0&=C2)) dela(100); while (!(IOPIN0&=C2)); return '5'; IO0CLR =RowB;IO0SET =RowA;IO0SET =RowC;IO0SET =RowD; if (!(IOPIN0&=C3)) dela(100); while (!(IOPIN0&=C3)); return '6'; IO0CLR =RowC;IO0SET =RowA;IO0SET =RowB;IO0SET =RowD; //Test Row C if (!(IOPIN0&=C1)) dela(100); while (!(IOPIN0&=C1)); return '7'; IO0CLR =RowC;IO0SET =RowA;IO0SET =RowB;IO0SET =RowD; if (!(IOPIN0&=C2)) dela(100); while (!(IOPIN0&=C2)); return '8'; IO0CLR =RowC;IO0SET =RowA;IO0SET =RowB;IO0SET =RowD; if (!(IOPIN0&=C3)) dela(100); while (!(IOPIN0&=C3)); return '9'; IO0CLR =RowD;IO0SET =RowA;IO0SET =RowB;IO0SET =RowC;//Test Row D if (!(IOPIN0&=C1)) dela(100); while (!(IOPIN0&=C1)); return '*'; IO0CLR =RowD;IO0SET =RowA;IO0SET =RowB;IO0SET =RowC; if (!(IOPIN0&=C2)) dela(100); while (!(IOPIN0&=C2)); return '0'; IO0CLR =RowD;IO0SET =RowA;IO0SET =RowB;IO0SET =RowC; if (!(IOPIN0&=C3)) dela(100); while (!(IOPIN0&=C3)); return '#'; return 'n'; // Means no key has been pressed

10 char get_key(void) char key = 'n'; //get key from user //assume no key pressed while(key=='n') //wait untill a key is pressed key = READ_SWITCHES(); //scan the keys again and again return key; //when key pressed then return its value void dela(int x) int i,j; for(i=0;i<x;i++) for(j=0;j<200;j++); //null statement #define rs 0x #define en 0x void delay_ms(unsigned int t) unsigned int i; for(;t>0;t--) for(i=0;i<13000;i++); void cmd(unsigned char x) unsigned int y; y = x<<18; IOPIN1 = IOPIN1 & 0xFC00FFFF; IOPIN1 = IOPIN1 y; IOCLR1 = rs; IOSET1 = en; delay_ms(10); IOCLR1 = en; delay_ms(10); void lcd_disp(unsigned char x) unsigned int y; y = x<<18;

11 IOPIN1 = IOPIN1 & 0xFC00FFFF; IOPIN1 = IOPIN1 y; IOSET1 = rs; IOSET1 = en; delay_ms(10); IOCLR1 =en; delay_ms(10); void disp_str(unsigned char *x) while(*x) lcd_disp(*x++); void lcdinit() IODIR1=0x03FF0000; cmd(0x38); cmd(0x01); cmd(0x06); cmd(0x0c); cmd(0x80);

12 6. Write a program to create a portable hardward delay. #include <lpc214x.h> #define PLOCK 0x #define PRESCALE void delayms(unsigned int milliseconds); void initclocks(void); void inittimer0(void); void setuppll0(void); void feedseq(void); void connectpll0(void); int main(void) initclocks(); inittimer0(); IO0DIR = 0xFFFFFFFF; while(1) IO0SET = 0xFFFFFFFF; delayms(500); IO0CLR = 0xFFFFFFFF; delayms(500); //0.5 Second(s) Delay void inittimer0(void) T0CTCR = 0x0; T0PR = PRESCALE-1; T0TCR = 0x02; void delayms(unsigned int milliseconds) T0TCR = 0x02; T0TCR = 0x01;

13 while(t0tc < milliseconds); T0TCR = 0x00; void initclocks(void) setuppll0(); feedseq(); connectpll0(); feedseq(); VPBDIV = 0x01; void setuppll0(void) PLL0CON = 0x01; PLL0CFG = 0x24; void feedseq(void) PLL0FEED = 0xAA; PLL0FEED = 0x55; void connectpll0(void) while(!( PLL0STAT & PLOCK )); PLL0CON = 0x03;

14 7. Write a c program to test loop time outs. #include <lpc214x.h> #define sw 1<<0 void testtime_out(unsigned int milliseconds); unsigned char x; int main(void) IO0DIR = 0xFFFFFFFe; while(1) mn: x=iopin0; x=x&0x ; if(sw==0x ) IO0SET = 0xFFFFFFFF; IO0CLR = 0xFFFFFFFF; testtime_out(1500); //1.5 Second(s) time out loop goto mn; else if(sw==0x ) IO0SET = 0xFFFFFFFF; IO0CLR = 0xFFFFFFFF; testtime_out(1500); goto mn; //1.5 Second(s) time out loop void testtime_out(unsigned int milliseconds) // test time out loop unsigned int j; for(;milliseconds>0;milliseconds--) for(j=0;j<5000;j++);

15 8. Write a c program to test hardware based timeout loops. #include <lpc214x.h> #define PLOCK 0x #define PRESCALE #define sw 0x void delayms(unsigned int milliseconds); void initclocks(void); void inittimer0(void); void setuppll0(void); void feedseq(void); void connectpll0(void); unsigned char timeout_loop=0,x; int main(void) initclocks(); inittimer0(); IO0DIR = 0xFFFeFFFF; while(1) mn: x= IOPIN0; x=x&0x ; if(x==0x ) do x= IOPIN0; x=x&0x ; IO0SET = 0xFFFFFFFF; delayms(1000); // 1 Second(s) Delay IO0CLR = 0xFFFFFFFF; while(x==0x &&t0tcr!=0x00); goto mn; else if(x==0x ) do IO0SET = 0xFFFF0000; delayms(1000); // 1 Second(s) Delay IO0CLR = 0x0000FFFF; while(x==0x &&t0tcr!=0x00);

16 goto mn; void inittimer0(void) T0CTCR = 0x0; T0PR = PRESCALE-1; T0TCR = 0x02; void delayms(unsigned int milliseconds) T0TCR = 0x02; T0TCR = 0x01; while(t0tc < milliseconds); T0TCR = 0x00; timeout_loop++; void initclocks(void) setuppll0(); feedseq(); connectpll0(); feedseq(); VPBDIV = 0x01; void setuppll0(void) PLL0CON = 0x01; PLL0CFG = 0x24;

17 void feedseq(void) PLL0FEED = 0xAA; PLL0FEED = 0x55; void connectpll0(void) while(!( PLL0STAT & PLOCK )); PLL0CON = 0x03;

18 10. Write a program to display elapsed time over RS-232 link. #include <lpc214x.h> #define PLOCK 0x #define PRESCALE #define sw 0x void uart0_init(void); void uart0_tx(unsigned char); void str_uart0(unsigned char *x); void delayms(unsigned int milliseconds); void initclocks(void); void inittimer0(void); void setuppll0(void); void feedseq(void); void connectpll0(void); unsigned char timeout_loop=0,x; int main(void) uart0_init(); initclocks(); inittimer0(); IO0DIR = 0xFFFeFFFF; while(1) mn: x= IOPIN0; x=x&0x ; if(x==0x ) do str_uart0("event 1 is start and time is counting"); x= IOPIN0; x=x&0x ; IO0SET = 0xFFFFFFFF; delayms(1000); // 1 Second(s) Delay IO0CLR = 0xFFFFFFFF; while(x==0x &&t0tcr!=0x00); str_uart0("time is 1 sec for event 1is completed, event 1 is lights all are on");

19 goto mn; else if(x==0x ) do str_uart0("event 2 is start and time is counting"); IO0SET = 0xFFFF0000; delayms(2000); // 1 Second(s) Delay IO0CLR = 0x0000FFFF; while(x==0x &&t0tcr!=0x00); str_uart0("time is 2 sec for event 1is completed, event 2 is some lights are on remaining are off "); goto mn; void inittimer0(void) T0CTCR = 0x0; T0PR = PRESCALE-1; T0TCR = 0x02; void delayms(unsigned int milliseconds) T0TCR = 0x02; T0TCR = 0x01; while(t0tc < milliseconds); T0TCR = 0x00; timeout_loop++; void initclocks(void) setuppll0(); feedseq(); connectpll0(); feedseq();

20 VPBDIV = 0x01; void setuppll0(void) PLL0CON = 0x01; PLL0CFG = 0x24; void feedseq(void) PLL0FEED = 0xAA; PLL0FEED = 0x55; void connectpll0(void) while(!( PLL0STAT & PLOCK )); PLL0CON = 0x03; void uart0_init(void) PINSEL0 =0x ; U0LCR=0x83; U0DLL=98; U0DLM=0; U0LCR=0x03; void tx_uart0(unsigned char x) U0THR=x; while(!(u0lsr&=0x20)); void str_uart0(unsigned char *x) while(*x) tx_uart0(*x++);

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