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 0th bit of Port 0 will be set
    IO0CLR=0x00000001;  //it means 0th 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; // 0th 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 0th bit of port0 will be high
}
IO0PIN=0x00000002;// it means 1st bit 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 0th 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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5 comments:

  1. Where can i buy ARM 7 processor in nepal? What may be the estimated price?

    ReplyDelete
  2. This comment has been removed by the author.

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  3. Really interesting to see your comment.......Digitronix-Nepal is planning for your interest...Price is difference with the processor functions and capabality, may range from 1000 Nrs. for the processor and 5000-10000 Nrs. for Development boards..We can use Dev. boards for programming.

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  4. On which ARM processors, you give training? Really interested in CortexA Series processor. If it is available then i would like to join.

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  5. I think your post is very good, rather I would have liked to read a bit more about this topic because I think it is more interesting


    six months industrial training

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