Digitronix Nepal: ARM Processor

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ARM7 Tutorial in c

GPIO

FEATURES:

Direction control of individual bits

Separate control of output set and clear

All I/O default to inputs after reset

ARM 7 has two port named as Port 0 and Port 1. Each port can be used as I/P or O/P. Port 0 has 0-31 pins and Port1 has 16-31 pins.

Each Port can be used as GPIO(general purpose I/p and O/p) or As SFR(Special Function).

1. To use it as GPIO we have to set some register.

PINSEL0----it must be 0 to use LSB of port 0 as GPIO(0-15)

PINSEL1---it must be 0 to use MSB of port 0 as GPIO(16-31)

PINSEL2---it must be 0 to use Port 1 as GPIO

2. To set the direction of any Port as I/P or O/P we have to SET and

CLR a Register named as IODIR

1---set as o/p

0---set as i/p

Example:

IO0DIR=0x00000000; // it means port 0 will act as i/p

IO1DIR=0x000000ff; // it means lower 8 bit of port 1 will act as o/p

3. Now Lets Put some data on register. For that we are using two register IOSET and IOCLR. As its name shows it can set and clear particular data bit.

Example:

IO0SET=0x00000001; //it means 0^th bit of Port 0 will be set

IO0CLR=0x00000001; //it means 0^th bit of Port 0 will be cleared

Power supply ckt of ARM

ARM requires two power supply one is for CPU(+1.6 to 1.95v) and other is for I/O(+3 to 3.6v)

Now it’s Time for a “HELLO WORLD Program”

//this is written in Keil uvision v 4.0 and for LPC2124(ARM7 TDMI)//

// I am going to blink a LED, whose anode is connected to Port0.0

#include lpc21xx.h

int main()

{

int i;

PINSEL0=0x00000000; //port 0 set to GPIO

IO0DIR=0x00000001; // 0^th bit of port 0 will act as o/p

while(1)

{

IO0SET=0x00000001; // LED will glow

for(i=0;i<100000;i++); //to create some delay

IO0CLR-0x000000001; //Led will off

for(i=0;i<100000;i++); //to create some delay

}//http://digitronixnepal.blogspot.com/p/arm-processor.html

} www.digitronixnepal.blogspot.com

How to check Input in ARM7

To check input in ARM, we can use a register named as IOPIN. This register can also be used to set output.

Example:

if((IO0PIN&0x00000001) = = 0x00000001);

{

//this statement will execute when the 0^th bit of port0 will be high

}

IO0PIN=0x00000002;// it means ^1stbit of Port 0 set to High (As output)

Lets Do a I/P and O/P program

#include lpc21xx.h

int main()

{

PINSEL0=0;

IO0DIR=0x000000ff;

PINSEL2=0x00000000;

IO1DIR=0x00000000;

if((0x00010000&IO1PIN)==0x00000000) //giving input at p1.16

{

IO0PIN=0x00000001; // anode of led is connected to 0^th bit of Port0

}

else

{

IO0PIN=0x00000000;

}

ckt. Dig of the above code

Download PDF version of above GPIO Tutorial

More tutorials on ARM coming soon...Thanks to embbsys...krishna.

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