Lpc2000

hi all,

i'm new in the group , but i hope i will be helpful with you & share 
my little knowledge with you.

well, i'm working on the OLIMEX LPC2138 evaluation board & ARM cross 
works compiler & debugger.
i'm working on implementing a Voice Over Wifi phone.

i want to run the ADC & get samples for the voice @8khz ,& i will put 
the samples in a frames to pass it for the compression code.

i have written a code for the ADC_0_ISR interrupt handler, but when i 
debug the code it never enters the ADC_0_ISR , to be known i 
configured the ADC0 to work at 88khz & in burst mode.

i choosed 88khz ,because it is said in the LPC2138 manual that each 
conversion takes 11 clks to get 10 bits.  am i doing write ?

at last here is the code that i tested :)
//////////////////////////////
#include "LPC213x.h"
#include <__armlib.h>

void init_ADC(void)
{
    PINSEL0 |= 0x00000300;  //  select pin0.4 as AD pin AD0.6
    PCONP   |= 0x00001000;  // enable the power to ADC.0
    AD0CR = 0x00214040;  //  configure the AD & run at 88Khz clk at 
                         //CLK_DIV = 40, @cclk = 14.475Mhz
}

int ADC_Data(void)   // i'm only scaning on channel 6 where the 
                    //     microphone is connected
{
    int data_sample ;
    int channel ;  // we work on channel 6  ,  AD0.6
    int value;
         value = AD0DR;
         channel = ((value >> 24 ) & 0x00000007);
         if (channel == 6)
            {
               data_sample = ((value >> 6 ) & 0x000003ff);
               return data_sample ;
            }
}

static void ADC_0_ISR(void) __attribute__ ((interrupt ("IRQ")));

int B1samples[160]={0}; // buffer1  for the sampled voice
int B2samples[160]={0}; // buffer2  for the sampled voice
int samplesCount;       // samples count for the sampled voice


static void ADC_0_ISR(void)  
{
     
  if (samplesCount <160 )
     {
       B1samples[samplesCount] = ADC_Data();
       samplesCount++;
     } 
  else if (160<=samplesCount <320 ) 
       { 
          B2samples[samplesCount] = ADC_Data();
          samplesCount++;
        }
  else
         { samplesCount = 0 ;
           B1samples[samplesCount] = ADC_data();
         }
  __ARMLIB_isrDisableIRQ();
 
  VICVectAddr = 0;   // Update VIC priorities
}

int main (void)
{
    PINSEL0 |= 0x00000300;  //  select pin0.4 as AD pin AD0.6
    int i,j;
    int sampleddata[160]={0};

  VICIntSelect &= ~0x4000;  // AD0 interrupt is an IRQ interrupt 
  VICIntEnable = 0x4000;   // Enable AD0 interrupt 
  VICVectCntl0 = 0x32;  // Use slot 0 for AD0 interrupt 
  VICVectAddr0 = (unsigned int)ADC_0_ISR;  // Set the address of ISR 
                                           //   for slot 0 

  __ARMLIB_enableIRQ();  // Enable Interrupts 
  __ARMLIB_isrEnableIRQ();  // enable the interrupts

  init_ADC();

      while(1)
      {   
         if (samplesCount ==159)
                for (i=0;i<160;i++) 
                  sampleddata[i] = B1samples[i]; // we will pass the 
                                                 //B1samples to encoder
         if (samplesCount ==159)
                for (j=0;j<160;j++)
                sampleddata[j] = B2samples[j]; // we will pass the 
                                               //B2samples to encoder
      }
}
///////////////////////

i really appreciate your help to spot the error & tell me what i have 
done wrong.

thanks all,

osama el haggar

--- In lpc2000@yahoogroups.com, "osaelhaggar" <osamaelhaggar@...> wrote:
Hi
 VICIntSelect &= ~0x4000;  // AD0 interrupt is an IRQ interrupt 
 VICIntEnable = 0x4000;   // Enable AD0 interrupt 

Should be 0x00040000

Regards