ADC problem on lpc1769

lpcware — Wed, 15 Jun 2016 22:25:41 GMT

Content originally posted in LPCWare by karanmehta93 on Tue Jan 01 11:27:01 MST 2013

#include<LPC17xx.h> //Always Put this header file on the top of the code else u will get errors
#include"LPC17xx_1.h"

#include"PLL.h"
#include"NVIC.h"

#include"ADC.h"

int GetADC(int channel)
{ 
PCONP |= 0x00001000;
int adc_clkdiv;

switch (channel){

case Adc0:
PINSEL1 &= ~0x0000C000;
PINSEL1 |=  0x00004000;
break;
case Adc1:
PINSEL1 &= ~0x00030000;
PINSEL1 |=  0x00010000;
break;
case Adc2:
      PINSEL1 &= ~0x000C0000;
PINSEL1 |=  0x00040000; 
     break;
case Adc3:
    PINSEL1 &= ~0x00300000;
PINSEL1 |=  0x00100000;
     break;
case Adc4:
PINSEL3 &= ~0x30000000;
PINSEL3 |=  0x30000000;
break;
case Adc5:
PINSEL3 &= ~0xC0000000;
PINSEL3 |=  0xC000000;
break;
case Adc6:
PINSEL0 &= ~0x00000030;
PINSEL0 |=  0x00000020;
break;
case Adc7:
PINSEL0 &= ~0x000000C0;
PINSEL0 |=  0x00000080; 
break;
}

adc_clkdiv = 4;
AD0CR = 1<<channel;
AD0CR |= adc_clkdiv<<8 | 1<<16 | 1<<21;
waitus(100);
int addr,ADCval=0;
switch (channel){

case Adc0:
addr  = AD0DR0;
if(addr & 0x80000000)
ADCval=((addr & 0x0000FFF0)>>4); 
break;
case Adc1:
addr = AD0DR1;
if(addr & 0x80000000)
ADCval=((addr & 0x0000FFF0)>>4);
  break;  
case Adc2:
addr  = AD0DR2;
if(addr & 0x80000000)
ADCval=((addr & 0x0000FFF0)>>4);
  break;
case Adc3:
addr  = AD0DR3;
if(addr & 0x80000000)
    ADCval=((addr & 0x0000FFF0)>>4);
break;
case Adc4:
addr  = AD0DR4;
if(addr & 0x80000000)
   ADCval=((addr & 0x0000FFF0)>>4);
break;
case Adc5:
addr  = AD0DR5;
if(addr & 0x80000000)
    ADCval=((addr & 0x0000FFF0)>>4);
break;
case Adc6:
addr  = AD0DR6;
if(addr & 0x80000000)
ADCval=((addr & 0x0000FFF0)>>4);
break;
case Adc7:
addr  = AD0DR7;
if(addr & 0x80000000)
ADCval=((addr & 0x0000FFF0)>>4);
break;
} 
AD0CR = 0x01;
return ADCval; 
}

Following is my code for ADC conversion. It works for all channels except 5 and 6.
I have checked for all types of hardware problems and haven't found any.
Please help urgently.

Re: ADC problem on lpc1769

lpcware — Wed, 15 Jun 2016 22:25:42 GMT

Content originally posted in LPCWare by karanmehta93 on Tue Jan 01 12:15:34 MST 2013
Please dont see the thread. It was a silly mistake in PINSEL registers.

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