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explanation and pin configuration for code in lpc2148

int x;
 PINSEL0 = (PINSEL0 & 0x3FFF3FF0) | 0x00000005; // Configure pins for touch screen
 PINSEL1 = (PINSEL1 & 0xC3FFFFFF) | 0x10000000;
 IO0DIR =  (IO0DIR &  0xDFFF7F7F) | 0x00008080;

 IO0SET = IO0SET | 0x00000080;     // Set pin to '1'
 IO0CLR = IO0CLR | 0x00008000;    // Set pin to '0'

 AD0CR = ( AD0CR & 0xFFD00000 ) | 0x00200208 ;  // Start the ADC

can anyone tell me the pins I need to connect in my board according to the code

Parents

0 Jayapriya A over 8 years ago in reply to A Coder

#include<lpc214x.h> // Header file for Phillips LPC2148 controller
#include<stdio.h>
#define CCLK 30
#define PCLK 10
#include<uart.h>
#include<stdlib.h>
int x;
int y;
int xcoordinate(void);
int ycoordinate(void);

void delayms(unsigned int ms);
#define DAC_BIAS   0x00010000
int main(void)
{
        xcoordinate();

        ycoordinate();

}
void delayms(unsigned int ms)
{

        T0TCR = 0x02;
        T0TCR = 0x01;
        while( T0TC < ms);
        T0TCR = 0x00;
}
int xcoordinate(void)
{
 int x;
 PINSEL0 = (PINSEL0 & 0x3FFF3FF0) | 0x00000005; // Configure pins for touch screen
 PINSEL1 = (PINSEL1 & 0xC3FFFFFF) | 0x10000000;
 IO0DIR =  (IO0DIR &  0xDFFF7F7F) | 0x00008080;

 IO0SET = IO0SET | 0x00000080;     // Set pin to '1'
 IO0CLR = IO0CLR | 0x00008000;    // Set pin to '0'

 AD0CR = ( AD0CR & 0xFFD00000 ) | 0x00200208 ;  // Start the ADC

 while(1)
 {
   delayms(10);
   AD0CR = ( AD0CR & 0xF8FFFFFF ) | 0x01000000 ;

 xchkadc:

   x = AD0DR3 & 0x80000000 ;

   if(x == 0x80000000)  // Check if A-D conversion is complete
    {

      x = 0x00000000;
      x = AD0DR3 & 0x0000FFC0;
      x = x >> 6;
      x = x & 0x000003FF;
      if(x <= 10)
      {
        goto xexit;
      }

      AD0CR = AD0CR & 0xF8FFFFFF;
      return x;     // return the value of touch in x direction

    }

   goto xchkadc;

  xexit:
  AD0CR = AD0CR & 0xF8FFFFFF;
  }
  return 0;
}

int ycoordinate(void)
{
 int y;

 PINSEL0 = (PINSEL0 & 0x3FFF3FF0) | 0xC0000005;    // Configure pins for touch screen
 PINSEL1 = (PINSEL1 & 0xC3FFFFFF) | 0x00000000;

 IO0DIR = (IO0DIR & 0x9FFFFF7F) | 0x60000000;

 IO0SET = IO0SET | 0x40000000;    //// Set pin to '1'
 IO0CLR = IO0CLR | 0x20000000;    //// Set pin to '0'

 AD1CR = (AD1CR & 0xF0D00000) | 0x00200220 ;    //// Start the ADC

 while(1)
 {

  delayms(10);
  AD1CR = ( AD1CR & 0xF8FFFFFF ) | 0x01000000 ;

   ychkadc:

   y = AD1DR5 & 0x80000000 ;

   if(y == 0x80000000)    // Check if A-D conversion is complete
    {

      y = 0x00000000;
      y = AD1DR5 & 0x0000FFC0;
      y = y >> 6;
      y = y & 0x000003FF;
      if(y <= 10)
      {
        goto yexit1;
      }

      AD1CR = AD1CR & 0xF8FFFFFF;
      return y;            // return the value of touch in y direction

    }

   goto ychkadc;

   yexit1:

    AD1CR = AD1CR & 0xF8FFFFFF;
  }

 return 0;
}

this is a code for touch screen interface which I got from net...I don't understand which pins I should connect on my arm7 board to get the touch coordinates in lcd

Reply

0 Jayapriya A over 8 years ago in reply to A Coder

#include<lpc214x.h> // Header file for Phillips LPC2148 controller
#include<stdio.h>
#define CCLK 30
#define PCLK 10
#include<uart.h>
#include<stdlib.h>
int x;
int y;
int xcoordinate(void);
int ycoordinate(void);

void delayms(unsigned int ms);
#define DAC_BIAS   0x00010000
int main(void)
{
        xcoordinate();

        ycoordinate();

}
void delayms(unsigned int ms)
{

        T0TCR = 0x02;
        T0TCR = 0x01;
        while( T0TC < ms);
        T0TCR = 0x00;
}
int xcoordinate(void)
{
 int x;
 PINSEL0 = (PINSEL0 & 0x3FFF3FF0) | 0x00000005; // Configure pins for touch screen
 PINSEL1 = (PINSEL1 & 0xC3FFFFFF) | 0x10000000;
 IO0DIR =  (IO0DIR &  0xDFFF7F7F) | 0x00008080;

 IO0SET = IO0SET | 0x00000080;     // Set pin to '1'
 IO0CLR = IO0CLR | 0x00008000;    // Set pin to '0'

 AD0CR = ( AD0CR & 0xFFD00000 ) | 0x00200208 ;  // Start the ADC

 while(1)
 {
   delayms(10);
   AD0CR = ( AD0CR & 0xF8FFFFFF ) | 0x01000000 ;

 xchkadc:

   x = AD0DR3 & 0x80000000 ;

   if(x == 0x80000000)  // Check if A-D conversion is complete
    {

      x = 0x00000000;
      x = AD0DR3 & 0x0000FFC0;
      x = x >> 6;
      x = x & 0x000003FF;
      if(x <= 10)
      {
        goto xexit;
      }

      AD0CR = AD0CR & 0xF8FFFFFF;
      return x;     // return the value of touch in x direction

    }

   goto xchkadc;

  xexit:
  AD0CR = AD0CR & 0xF8FFFFFF;
  }
  return 0;
}

int ycoordinate(void)
{
 int y;

 PINSEL0 = (PINSEL0 & 0x3FFF3FF0) | 0xC0000005;    // Configure pins for touch screen
 PINSEL1 = (PINSEL1 & 0xC3FFFFFF) | 0x00000000;

 IO0DIR = (IO0DIR & 0x9FFFFF7F) | 0x60000000;

 IO0SET = IO0SET | 0x40000000;    //// Set pin to '1'
 IO0CLR = IO0CLR | 0x20000000;    //// Set pin to '0'

 AD1CR = (AD1CR & 0xF0D00000) | 0x00200220 ;    //// Start the ADC

 while(1)
 {

  delayms(10);
  AD1CR = ( AD1CR & 0xF8FFFFFF ) | 0x01000000 ;

   ychkadc:

   y = AD1DR5 & 0x80000000 ;

   if(y == 0x80000000)    // Check if A-D conversion is complete
    {

      y = 0x00000000;
      y = AD1DR5 & 0x0000FFC0;
      y = y >> 6;
      y = y & 0x000003FF;
      if(y <= 10)
      {
        goto yexit1;
      }

      AD1CR = AD1CR & 0xF8FFFFFF;
      return y;            // return the value of touch in y direction

    }

   goto ychkadc;

   yexit1:

    AD1CR = AD1CR & 0xF8FFFFFF;
  }

 return 0;
}

this is a code for touch screen interface which I got from net...I don't understand which pins I should connect on my arm7 board to get the touch coordinates in lcd

Children

0 A Coder over 8 years ago in reply to Jayapriya A

Whats wrong with your reference manual?

The code you 'found' is very ugly. Maybe if you knew more about what you're after then you'd recognise something better.
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