MICROCONTROLLER AND EMBEDDED SYSTEMS LABORATORY Part B

 Program 9 Display “Hello World” message using Internal UART.

#include<lpc21xx.h>

void Uart0Init(void) //initialize serial interface

{

PINSEL0=0X00000005; // enable RXD0 (P0.1) & TXD0 (P0.0)

U0LCR = 0X83; // 8 bits, no parity, 1 stop bit

U0DLL = 97; // 9600 Baud rate @ 15MHz PCLK

U0LCR = 0X03; // DLAB = 0

}

void Uart0PutCh(unsigned char ch) //write char to serial port

{

U0THR = ch; // Transmission hold register

while(!(U0LSR & 0x20));

//checking whether the Char is completely transmitted,

// TX= 0 or 1

// if tx bit =1 , complete transmission of a char to PC has been done

}

void uart_print(char *a)

{

int i;

for(i=0;a[i]!='\0';i++)

Uart0PutCh(a[i]);

//one char at a time is transmitted using this function

}

int main()

{

Uart0Init(); // function call to initialize LPC2148

uart_print("Hello World"); // function call to transmit the data to PC

}

Program explanation and Demo: UART



 Program 10  Interface and Control a DC Motor.

 //#define MOTOR 0x00000060 // P0.5-P0.6

//#define KEY_CTRL_PIN IO1PIN


#include <LPC214x.H> /* LPC214x definitions */

#define MCW 0X00010000 // OR (1 << 16)//KEY1 P1.16

#define MCCW 0X00020000 // OR (1 << 17)//KEY2 P1.17

#define MOFF 0X00040000 // OR (1 << 18) //KEY3 P1.18

////////////////////// MAIN /////////////////////////////////////

int main (void)

{

IO1DIR = 0X0007; // OR ~( MOFF | MCW |MCCW );

IO0DIR = 0X00000060; // OR (MOTOR );

while(1)

{

if(!(IO1PIN & MCW)) //Clock wise key pressed

{

IO0PIN = 0X000000A0 ;

}


if (!(IO1PIN & MOFF)) //OFF key pressed

{

IO0PIN = 0X00000000 ;

}


if (!(IO1PIN & MCCW)) // Anticlock wise

IO0PIN = 0X000000C0 ;

}

}

Program explanation and Demo: DC Motor Working of DC motor





 Program 11  Interface a Stepper motor and rotate it in clockwise and anti-clockwise direction.

#include <LPC214x.H> /* LPC214x definitions */


#define CLK 0x00010000 // or (1 << 16) //KEY1 P1.16

#define ACLK 0x00020000 // or (1 << 17) //KEY5 P1.17

void delay(unsigned int count)

{

int j=0,i=0;

for(j=0;j<count;j++)

{

for(i=0;i<500;i++);

}

}

int main (void)

{

unsigned char run=1;

IO1DIR = 0x0F000000; //make Port P1.31 to P1.24 as output

PINSEL2 = 0x0;

// to ensure RTCK/P1.23 behaves like GPIO, no accidental JTAG

{

while(1)

{

if (!(IO1PIN & CLK) )

run = 1;

if (!(IO1PIN & ACLK))

run = 0;

if (run==1)

{

IO1PIN = 0X01000000;

delay(100);

IO1PIN = 0X02000000;

delay(100);

IO1PIN = 0X04000000;

delay(100);

IO1PIN = 0X08000000;

delay(100);

}

else

{

IO1PIN = 0X08000000;

delay(100);

IO1PIN = 0X04000000;

delay(100);

IO1PIN = 0X02000000;

delay(100);

IO1PIN = 0X01000000;

delay(100);

}

}

  }

}

Program explanation and Demo: Stepper motor



 Program 12  Determine Digital output for a given Analog input using Internal ADC of ARM controller.

#include <LPC214x.H> /* LPC214x definitions */

#include <stdio.h>

#include "lcd.h"


////////// Init ADC0 /////////////////

Init_ADC()

{

// Convert Port pin 0.28 to function as AD0.2

PINSEL1 = 0X01000000;

}

////////// READ ADC0 CH:2 /////////////////

unsigned int Read_ADC()

{

unsigned int i=0;

AD0CR = 0x00200D02; //0x00200D02;

AD0CR |= 0x01000000; // Start A/D Conversion

do

{

i = AD0GDR; // Read A/D Data Register

} while ((i & 0x80000000) == 0); // Wait for end of A/D Conversion

return (i >> 6) & 0x03FF; // bit 6:15 is 10 bit AD value


}

////////// DISPLAY ADC VALUE /////////////////

Display_ADC()

{

unsigned int adc_value = 0;

char buf[4];

adc_value = Read_ADC();

sprintf((char *)buf, "%3d", adc_value);

lcd_putstring16(0,"ADC VAL = 000 ");

lcd_gotoxy(0,10);

lcd_putstring(buf);

}


////////// MAIN /////////////////

int main (void)

{

init_lcd();

Init_ADC();

while(1)

{

Display_ADC();

delay(50000);

}    

}

Program explanation and Demo: ADC



 Program 13  Interface a DAC and generate Triangular and Square waveforms.

 #include <LPC214x.H> /* LPC214x definitions */

////////// Init DAC /////////////////

Init_DAC()

{

// Convert Port pin 0.25 to function as DAC

PINSEL1 = 0X00080000;

DACR = 0;

}

////////// Write DAC /////////////////

Write_DAC(unsigned int dacval)

{

DACR = dacval << 6;

}

////////// MAIN /////////////////

int main (void)

{

unsigned int i;

Init_DAC();

while(1)

{

for(i=0;i<1024;i++)

Write_DAC(i);


for(i=1023;i>0;i--)

Write_DAC(i);

}

}

 #include <LPC214x.H> /* LPC214x definitions */

////////// Init DAC /////////////////

Init_DAC()

{

// Convert Port pin 0.25 to function as DAC

PINSEL1 = 0X00080000;

DACR = 0;

}

////////// Write DAC /////////////////

Write_DAC(unsigned int dacval)

{

DACR = dacval << 6;

}

void delay(unsigned int count)

{

int j=0,i=0;

for(j=0;j<count;j++)

{

for(i=0;i<120;i++);

}

}

////////// MAIN /////////////////

int main (void)

{

Init_DAC();

while(1)

{

Write_DAC(00);

delay(100); //change this value to change Frequency

Write_DAC(1023); //change this value to change Amplitude

delay(100); //change this value to change Frequency

}

}

Program explanation and Demo: DAC


 Program 14  Interface a 4x4 keyboard and display the key code on an LCD.

include <LPC214x.H>                       /* LPC214x definitions */

#include "lcd.h"


/////////////////////////////////////////////


#define COL1    0X00010000  // OR       (1 << 16)  

#define COL2    0X00020000  // OR       (1 << 17)

#define COL3    0X00040000  // OR       (1 << 18)

#define COL4    0X00080000  // OR       (1 << 19)


#define ROW1    0X00100000  // OR       (1 << 20)

#define ROW2    0X00200000  // OR       (1 << 21)

#define ROW3    0X00400000  // OR       (1 << 22)

#define ROW4    0X00800000  // OR       (1 << 23)


/////////////// COLUMN WRITE /////////////////////

void col_write( unsigned char data )

{

  unsigned int temp=0;

  temp=(data << 16);


  IO1CLR = (COL1 | COL2 | COL3 | COL4);

  IO1SET = temp;

}

///////////////////////////////// MAIN  ///////////////////////////////////////

int main (void) 

{

unsigned char key, i;

unsigned char rval[] = {0x7,0xB,0xD,0xE,0x0};

unsigned char keyPadMatrix[] = 

{ 

    'C','8','4','0',

    'D','9','5','1',

    'E','A','6','2',

    'F','B','7','3'

};

  init_lcd();

  IO1DIR |= 0X000F0000;  //Set COLs as Outputs and Set ROW lines as Inputs

while (1)

 {

    key = 0;

    for( i = 0; i < 4; i++ )

    {       

        // turn on COL output one by one

col_write(rval[i]);

        // read rows - break when key press detected

        if (!(IO1PIN & ROW1))

            break;

        key++;

        if (!(IO1PIN & ROW2))

            break;

        key++;

        if (!(IO1PIN & ROW3))

            break;

        key++;

if (!(IO1PIN & ROW4))

            break;

        key++;

    }

  if (key == 0x10) 

{

key==0;

}

else

{

lcd_gotoxy(0,2);

lcd_putchar(keyPadMatrix[key]);

}

 }

}


 Program 15  Demonstrate the use of an external interrupt to toggle an LED On/Off.

#include <LPC214x.H>  

void delay(int count);

void init_ext_interrupt(void);

__irq void Ext_ISR(void);

int main (void) 

{

  init_ext_interrupt();   // initialize the external interrupt

  

  while (1)  

  {    

  }

}

void init_ext_interrupt()  //Initialize Interrupt

{

  EXTMODE = 0x4;           //Edge sensitive mode on EINT2

  

  EXTPOLAR &= ~(0x4);      //Falling Edge Sensitive

  PINSEL0 = 0x0000C000;    //Select Pin function P0.15 as EINT2

  

  /* initialize the interrupt vector */

  VICIntSelect &= ~ (1<<16);          // EINT2 selected as IRQ 16

  VICVectAddr5 = (unsigned int)Ext_ISR; // address of the ISR

  VICVectCntl5 = (1<<5) | 16;      // 

  VICIntEnable = (1<<16);             // EINT2 interrupt enabled

  EXTINT &= ~(0x4);  

}

__irq void Ext_ISR(void) // Interrupt Service Routine-ISR 

{

 IO1DIR |=0xFF000000;//make Port P1.31 to P1.24 as output

 IO1PIN ^= 0x01000000;   // Turn ON Buzzer

 //delay(10);

 //IO1PIN |= 0x00000000;//(1<<25);    // Turn OFF Buzzer

 EXTINT |= 0x4;      //clear interrupt

 VICVectAddr = 0;    // End of interrupt execution

}


 Program 16  Display the Hex digits 0 to F on a 7-segment LED interface, with an appropriate delay in between

#include <LPC214x.H> /* LPC214x definitions */

#define DIG2 (1 << 11)

//#define LED_DATA_MASK 0x007F8000

////////// digits are created using bit patterns corresponding to the segments ////////////////////

unsigned char dig[] =

{ 0x88,0xeb,0x4c,0x49,0x2b,0x19,0x18,0xcb,0x8,0x9,0xa,0x38,0x9c,0x68,0x1c,0x1e};


///////////////////////////////// MAIN ///////////////////////////////////////

int main (void)

{

unsigned char count=0;

unsigned short j=0;

unsigned short i=;0

unsigned char data ;

  IO0DIR |= (DIG2 ); //Set Digit control lines as Outputs

  IO0CLR = ( DIG2 ); //Clear Digit control lines

  while(1)

{

count++;

if(count ==16) count = 0;

for (i=0; i < 800; i++) //change to inc/dec speed of count

{

IO0CLR = 0x007F8000;

IO0SET = (dig[count] << 15);

IO0DIR |= 0x007F8000;

IO0SET = DIG2;

for (j=0;j<2000;j++); //change to inc/dec brightness of display

IO0CLR = DIG2;

}

}

}

Program explanation and Demo: 


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