[PIC] problem with CTMU pic24FJ256GB106

[Chester929]

Checking capacity for keypad example number 1.

int immediateValue;
  //  int Index;
    //Index = 0;

   /*int ADSELECT[5];

    ADSELECT[0] = 0x0100;
    ADSELECT[1] = 0x0200;
    ADSELECT[2] = 0x0400;
    ADSELECT[3] = 0x0800;
    ADSELECT[4] = 0x1000;*/

    //Read CTMU (Get the raw sensor reading)
    AD1PCFGL= 0xFFFF; //set all A/D channels to digital I/O pins
    TRISB = 0x0000;
    LATB = 0x0000;
    PORTB = 0x0000; //set all channels to logical 0 outputs

    Nop(); Nop(); Nop(); Nop();
    Nop(); Nop(); Nop(); Nop();
    
    //Wait for charge to drain
    TRISB = 0x0100; //set selected channel to input - RB8
    AD1PCFGL = ~0x0100; //set selected channel to analog A/D input - AN8

    Nop(); Nop(); Nop(); Nop();
    Nop(); Nop(); Nop(); Nop();

    //wait for A/D to connect to channel
    AD1CHS = 0x800; //select A/D channel - AN8
    CTMUCONbits.IDISSEN = 1; //Drain any charge on the A/D circuit

    Nop(); Nop(); Nop(); Nop(); Nop();
    //Wait for charge to drain

    CTMUCONbits.IDISSEN = 0; //Stop discharge of A/D circuit
    IFS0bits.AD1IF = 0; //Make sure A/D interrupt flag = 0
    AD1CON1bits.SAMP = 1; //Manually start sampling
    CTMUCONbits.EDG2STAT = 0; // Make sure edge2 is 0
    CTMUCONbits.EDG1STAT = 1; // Set edge1 - Start Charge

    //for (count = 0; count < loopCount; count++); // Delay for CTMU charge time
    delay_loop_1us(); // Delay for CTMU charge time
    delay_loop_1us();
    delay_loop_1us();
    
    CTMUCONbits.EDG1STAT = 0; //Clear edge1 - Stop Charge
    IFS0bits.AD1IF = 0;
    AD1CON1bits.SAMP = 0; //Clear SAMP bit to begin manual A/D conversion
    //disp_home();
    //disp_str("waiting");
    while(!IFS0bits.AD1IF); //Wait for the A/D conversion to finish - here is deadlock :(
    //disp_clear();
    immediateValue = ADC1BUF0; //Read the value from the A/D conversion
    AD1CON1bits.SAMP = 0;
    IFS0bits.AD1IF = 0;
    AD1CON1bits.DONE = 0; //Make sure A/D bits are cleared
    //End of CTMU read



    return immediateValue;

When im waiting for A/D conversion to finish im in deadlock .
Please, can u check where is problem? Or check if i heve set true bits for AN8 and RB8. Thank u.