ARM HARDWARE PROGRAMS
LAB PROGRAM 12:
To interface LCD with ARM Processor-ARM7TDMI/LPC2148. Write and execute program in C language for displaying the text messages and numbers on LCD.
#include
<LPC21xx.H>
char disp1[] =
"EWIT 2017";
void delay()
{
int i;
for(i = 0; i < 0x50000; i ++);
}
/* Function to
display the character */
void
Disp_Key(unsigned long c)
{
unsigned long l;
l = c << 16;
IOCLR1 = 0x00FF0000; /*Instruction IOCLR1 = 0x00FF0000 instructs the CPU to write
a Digital LOW logic on pin number 16 to 23 of PORT1. (IOCLR => Input Output
Port CLEAR Register). */
IOSET1 = l;
IOCLR0 = 0x003F8000; /* E R/W* RS */
IOSET0 = 0xfa << 15; /*
0 1
0 */
IOCLR0 = 0x003F8000;
IOSET0 = 0xf9 << 15; /*
0 0
1 */
IOCLR0 = 0x003F8000;
IOSET0 = 0xfd << 15; /*
1 0
1 */
IOCLR0 = 0x003F8000;
IOSET0 = 0xf9 << 15; /*
0 0
1 */
IOCLR0 = 0x003F8000;
delay();
}
/* Function to
issue the series of commands to the LCD module */
void
Command_Write(unsigned long com_word)
{
IOCLR1 = 0x00FF0000;
IOSET1 = com_word; /* Send
commands to the LCD through GPIO1 */
IOCLR0 = 0x003F8000; /* E R/W* RS */
IOSET0 = 0xfb << 15; /*
0 1
1 */
IOCLR0 = 0x003F8000;
IOSET0 = 0xf8 << 15; /*
0 0
0 */
IOCLR0 = 0x003F8000;
IOSET0 = 0xfc << 15; /*
1 0
0 */
IOCLR0 = 0x003F8000;
IOSET0 = 0xf8 << 15; /*
0 0
0 */
IOCLR0 = 0x003F8000;
delay();
}
/* Function to read
characters from a string and displaying the same by calling the
Disp_key fucntion */
void
Disp_String(char * c)
{
int i=0;
while(c[i] != 0x00)
{
Disp_Key(c[i]);
i ++;
}
}
/* Function to
initialize the LCD module */
void LCD_init(void)
{
unsigned long command;
command = 0x38 << 16; /* Function
set 8-bit, 1 line 5*7 font*/
Command_Write(command);
command = 0x0c << 16; /* Display on
off control. Diplay on, cursor off, */
Command_Write(command); /*
blink off */
command = 0x01 << 16; /*
Clear the LCD display */
Command_Write(command);
}
int main()
{
unsigned long com_word;
IODIR0 = 0x007F8000;
/* Configure the GPIO0 (P0.15 TO P0.22) Port B as output } */
IODIR1 = 0x00FF0000; /*GPIO1 (P1.16 to P1.22)Port A as
O/P */
LCD_init(); /* Initialize LCD module */
com_word = 0x80 << 16; /* displaying on the first line*/
Command_Write(com_word);
Disp_String(disp1); /* Displays the message on LCD */
}
LAB PROGRAM 13:
To
interface stepper motor with ARM processor ARM7TDMI/LPC2148. Write a program to
rotate stepper motor.
Clockwise
rotation
#include
<LPC214X.H> //header for LPC2148 header files
void
delay(unsigned int count)
{
unsigned int i ,j= 0;
for(i = 0; i <= count; i ++)
for(j = 0; j <= 5; j ++);
}
//unsigned
long i;
int
main()
{
IODIR1 = 0x00FF0000; //making the port1 as
output port
// i = 0x00110000;
while(1)
{
IOSET1 = 0x00880000; //send the sequence
10001000 to port1
delay(10000);
IOCLR1 = 0x00FF0000; //clear the pins of
port 1
IOSET1 = 0x00440000; //send the sequence
01000100 to port1
delay(10000);
IOCLR1 = 0x00FF0000; ; //clear the pins of
port 1
IOSET1 = 0x00220000; //send the sequence
00100010 to port1
delay(10000);
IOCLR1 = 0x00FF0000; //clear the pins of
port 1
IOSET1 = 0x00110000; //send the sequence
00010001 to port1
delay(10000);
IOCLR1 = 0x00FF0000; //clear the pins of
port 1
}
}
Counter Clockwise
rotation
#include <LPC214X.H>
void delay(unsigned int count)
{
unsigned int i,j = 0;
for(i = 0; i <= count; i ++){
for(j=0;j<=5;j++);
}
}
int main()
{
IODIR1 = 0x00FF0000; //making the port1 as output port
while(1)
{
IOSET1 = 0x00110000; //send the sequence
00010001 to port1
delay(10000);
IOCLR1
= 0x00FF0000; //clear the pins of port 1
IOSET1 = 0x00220000; //send the sequence
00100010 to port1
delay(10000);
IOCLR1
= 0x00FF0000; //clear the pins of port 1
IOSET1 = 0x00440000; //send the sequence
01000100 to port1
delay(10000);
IOCLR1
= 0x00FF0000; //clear the pins of port 1
IOSET1 = 0x00880000; //send the sequence
10001000 to port1
delay(10000);
IOCLR1
= 0x00FF0000; //clear the pins of port 1
}
}
