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Resitive touch screen

This is just a sample how to read a 4-pin restive touchsceen

    int ADCvalue, x, y;
    //
    // Read X axis. Set RC1 Low, RA1 high, RC0 input (floating) and read AN0
    TRISCbits.TRISC0 = 1;
    TRISCbits.TRISC1 = 0;
    LATCbits.LATC1 = 0;
    TRISAbits.TRISA1 = 0;
    TRISAbits.TRISA0 = 1;
    LATAbits.LATA1 = 1;
       
    AD1PCFG = 0xfffe;   // AD0
    AD1CON1 = 0x0000;
    AD1CSSL = 0x0000;
    AD1CHS = 0x0000;    // AN0
    AD1CON2 = 0x0000;
    AD1CON3 = 0x0002;

    AD1CON1bits.ADON = 1;

    ADCvalue = 0;

    IFS0bits.AD1IF = 0;
    AD1CON1bits.SAMP = 1;
    __delay_ms(50);
    AD1CON1bits.SAMP = 0;
    while (!AD1CON1bits.DONE)
        ;
    ADCvalue = ADC1BUF0;
    x = ADCvalue/6; // Scale X-value
    //
    // Read Y axis. Set RC0 Low, RA0 high, RC1 input (floating) and read AN1
    AD1PCFG = 0xfffd;   // AD1
    TRISCbits.TRISC0 = 0;
    LATCbits.LATC0 = 0;
    TRISCbits.TRISC1 = 1;
    TRISAbits.TRISA1 = 1;
    TRISAbits.TRISA0 = 0;
    LATAbits.LATA0 = 1;
    AD1CHS = 0x0001;    // AN1
    ADCvalue = 0;

    IFS0bits.AD1IF = 0;
    AD1CON1bits.SAMP = 1;
    __delay_ms(50);
    AD1CON1bits.SAMP = 0;
    while (!AD1CON1bits.DONE)
        ;
    ADCvalue = ADC1BUF0;
    y = ADCvalue/10;    // Scale Y-value
    xprintf("\rTouch x:%4d y:%4d", x,y);

See also:


file: /Techref/Resisitive_Touch.htm, 1KB, , updated: 2017/4/14 06:36, local time: 2017/12/11 15:09,
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