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Em 31/07/2013 08:20, alan.b.pearce@stfc.ac.uk escreveu:
>> I did it with a PIC16F648A and a Nintendo DS resistive touch-screen in C=
..
>> The source code is not at hand right now. Later I will post the code and
>> the schematic.
>>
> Thanks, would appreciate it.
>
> Sounds like it is similar to the first link that Radhakrishnan posted, bu=
t I would still like to look at it.


Here it is.

I was mistaken about the MCU, I used the PIC16F690.

The schematic is just for the touch circuit to save bandwidth, you are
using a different MCU anyway.
The function of the resistors is to give a voltage level clearly
different when the panel is not touched. In my setup I got readings
close to zero in both X and Y axis when the panel is not touched and
above 300 when it is touched. I used the threshold of 50 for testing
purposes.

The code below was trimmed just to the minimum necessary.
The delays are too long and can be reduced a lot, some of them can be
completely eliminated. They were introduced to try to eliminate an
interference when the equipment was used in a nightclub but were
ineffective and I forgot to remove them. It seems that inside a
nightclub there is a lot of RFI and the conductive surfaces of the
touch-pad are an excellent antenna.


Best regards,

Isaac



//=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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=3D=3D=3D=3D
// Copyright (c) 2011, Isaac Marino Bavaresco
// All rights reserved
// isaacbavaresco@yahoo.com.br
//=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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=3D=3D=3D=3D
// Set TAB width to 4 characters
//=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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=3D=3D=3D=3D
//
//                                PIC16F690
//
//                  +-----------------U-----------------+
//                  |                                   |
//        VCC  P> =3D=3D| 1 VDD                      VSS 20 |=3D=3D <P  GND
//                  |                                   |
//             x> =3D=3D| 2 RA5/CLKI         RA0/ICSPDAT 19 |=3D=3D <-> PGD
//                  |                                   |
//            <x  =3D=3D| 3 RA4/CLKO         RA1/ICSPCLK 18 |=3D=3D <-  PGC
//                  |                                   |
//      !MCLR  -> =3D=3D| 4 RA3/MCLR             AN2/RA2 17 |=3D=3D <A> TOU=
CH_B
//                  |                                   |
//       N.C. <0  =3D=3D| 5 RC5                  AN4/RC0 16 |=3D=3D <A> TOU=
CH_L
//                  |                                   |
//     PWR_ON <-  =3D=3D| 6 RC4                  AN5/RC1 15 |=3D=3D <A> TOU=
CH_T
//                  |                                   |
//       N.C. <0  =3D=3D| 7 RC3                  AN6/RC2 14 |=3D=3D <A> TOU=
CH_R
//                  |                                   |
//     VSENS2  A> =3D=3D| 8 RC6                      RB4 13 |=3D=3D <A  VSE=
NS1
//                  |                                   |
//       N.C. <0  =3D=3D| 9 RC7                   RB5/RX 12 |=3D=3D <-  RXD
//                  |                                   |
//        TXD <-  =3D=3D|10 RB7/TX                   RB6 11 |=3D=3D  0> N.C=
..
//                  |                                   |
//                  +-----------------------------------+
//
//  Legend:
//  "<-  |" or "|  ->" =3D Output-only signal
//  " -> |" or "| <- " =3D Input-only signal
//  "<-> |" or "| <->" =3D Bi-directional signal
//  " P> |" or "| <P " =3D Power input
//  " A> |" or "| <A " =3D Analog input signal
//  "<A> |" or "| <A>" =3D Output or analog input signal
//  "<0  |" or "|  0>" =3D Always zero output signal
//  "<1  |" or "|  1>" =3D Always one output signal
//  "<x  |" or "|  x>" =3D Crystal output signal
//  " x> |" or "| <x " =3D Crystal input signal
//=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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=3D=3D=3D=3D
#define TOUCH_T         RC1
#define TOUCH_B         RA2
#define TOUCH_L         RC0
#define TOUCH_R         RC2

#define TOUCH_T_DIR     TRISC1
#define TOUCH_B_DIR     TRISA2
#define TOUCH_L_DIR     TRISC0
#define TOUCH_R_DIR     TRISC2
//=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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=3D=3D=3D=3D
unsigned long ReadTouchScreen( void )
    {
    unsigned short  X, Y;

  =20
//-------------------------------------------------------------------------=
-
    // Convert the coordinate Y

    PORTA       &=3D ~0x04;
    PORTC       &=3D ~0x07;

    TOUCH_T_DIR =3D 0;
    TOUCH_B_DIR =3D 0;
    TOUCH_L_DIR =3D 0;
    TOUCH_R_DIR =3D 0;

    Delay_us( 10 );

    TOUCH_L_DIR =3D 1;
    TOUCH_R_DIR =3D 1;

    TOUCH_T     =3D 1;

    Delay_us( 40 );
    ADCON0      =3D ( 6 << 2 ) | 0x81;
    Delay_us( 10 );
    GODONE      =3D 1;
    while( GODONE )
        CLRWDT();

    Y   =3D ( (unsigned short)ADRESH << 8 ) | (unsigned short)( ADRESL << 0=
 );

  =20
//-------------------------------------------------------------------------=
-
    // Convert the coordinate X

    PORTA       &=3D ~0x04;
    PORTC       &=3D ~0x07;

    TOUCH_T_DIR    =3D 0;
    TOUCH_B_DIR    =3D 0;
    TOUCH_L_DIR    =3D 0;
    TOUCH_R_DIR    =3D 0;

    Delay_us( 10 );

    TOUCH_T_DIR =3D 1;
    TOUCH_B_DIR =3D 1;

    TOUCH_L     =3D 1;

    Delay_us( 40 );
    ADCON0      =3D ( 2 << 2 ) | 0x81;
    Delay_us( 10 );
    GODONE      =3D 1;
    while( GODONE )
        CLRWDT();

    X   =3D ( (unsigned short)ADRESH << 8 ) | (unsigned short)( ADRESL << 0=
 );

  =20
//-------------------------------------------------------------------------=
-

    PORTA       &=3D ~0x04;
    PORTC       &=3D ~0x07;

    TOUCH_T_DIR =3D 0;
    TOUCH_B_DIR =3D 0;
    TOUCH_L_DIR =3D 0;
    TOUCH_R_DIR =3D 0;

  =20
//-------------------------------------------------------------------------=
-

    return ( (unsigned long)X << 16 ) | ( (unsigned long)Y << 0 );
    }
//=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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=3D=3D=3D=3D
void main( void )
    {
    ANSEL   =3D 0x74; // 0111 0100
    ANSELH  =3D 0x05; // xxxx 0101

    PORTA   =3D 0x00; // 0000 0000
    TRISA   =3D 0xff; // 1111 1111
    PORTC   =3D 0x00; // 0000 0000
    TRISC   =3D 0x47; // 0100 0111

    ADCON1  =3D 0x20;
    ADCON0  =3D 0x81;

    // Insert your code here...

    }
//=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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=3D=3D=3D=3D


--_003_51F9037A5000205yahoocombr_
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