Lesson2 – Touchscreen libraries – MikroC – The resistive Touch Panel 4 Wire

This post is also available in: Türkçe (Turkish)

• I wrote in mikroC , 4-wire resistive touch panel control library
• I used the mikroelektronika circuit to drive the panel. Below is the circuit diagram
• Guide  and video watch ?
• Touch you can see in the video library “writing” and “pixel” functions belong to the library I have written. Therefore, if you are using standard mikroC library must write the functions that you can use the library or by downloading my library here (mikroC GLCD DISPLAY LIBRARY – (SAP1024B – T6963C))
• IMPORTANT! – Analog to Digital conversion reference the supply voltage is, therefore, noise must be removed or use this circuit (+5v -5v 3.3v SWITCH MOD REGULATOR)
• Question and  error  notifications send comment  !

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Materials Required for Circuit Construction

1. 1 PCS – 4 Pin FPC Socket( for touch panel connection)
2. 2 PCS- 100 nf Polyester Capacitors
3. 2 PCS – 47K Resistor
4. 8 PCS – 1K Resistor
5. 2 PCS – 10K Resistor
6. 3 PCS – BC546 Transistor
7. 2 PCS – BC556 Transistor

 

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Circuit Diagram

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Codes

//DOKUNMATİK PANEL PİNLERİ//////////
sbit surucu_a at RA5_bit; //touch panel driver_a pin
sbit surucu_b at RB4_bit; //touch panel driver_b pin
sbit analog_x at RA0_bit; //touch panel analog port end pin
sbit analog_y at RA1_bit; //touch panel analog port end pin

sbit surucu_a_Direction at TRISA5_bit; //surucu_a pini
sbit surucu_b_Direction at TRISB4_bit; //surucu_b pini
sbit analog_x_Direction at TRISA0_bit; //analog port ucu pini
sbit analog_y_Direction at TRISA1_bit; //analog port ucu pini

 

//Calibration Pre-Function Codes
//pixel fonksiyonu içerisinde yazan ölçüler en ideal kalibrasyon ölçüleridir(x,y)
//kalibrasyon ölçüleri ile ilgili yukarıdaki resmi inceleyebilirsiniz
void kalbire_et()
{
 do
 {
 SAP1024_YAZI_YAZMA(1,8,"1.Noktaya Dokunun");
 SAP1024_PIXEL((GENISLIK_D*20)/100,(YUKSEKLIK_D*80)/100,1);
 }while(D_PANEL_KALIBRASYON_NOKTA_1()!=1);
 sap1024_lcd_temizle();

 do
 {
 SAP1024_YAZI_YAZMA(1,8,"2.Noktaya Dokunun");
 SAP1024_PIXEL((GENISLIK_D*20)/100,(YUKSEKLIK_D*20)/100,1);
 }while(D_PANEL_KALIBRASYON_NOKTA_2()!=1);
 sap1024_lcd_temizle();

 do
 {
 SAP1024_YAZI_YAZMA(1,8,"3.Noktaya Dokunun");
 SAP1024_PIXEL((GENISLIK_D*80)/100,(YUKSEKLIK_D*20)/100,1);
 }while(D_PANEL_KALIBRASYON_NOKTA_3()!=1);
 sap1024_lcd_temizle();

 do
 {
 SAP1024_YAZI_YAZMA(1,8,"4.Noktaya Dokunun");
 SAP1024_PIXEL((GENISLIK_D*80)/100,(YUKSEKLIK_D*80)/100,1);
 }while(D_PANEL_KALIBRASYON_NOKTA_4()!=1);
 sap1024_lcd_temizle();
}

//Touchscreen Codes
while(1)
 {
   x1=D_PANEL_KONUM_X();//dokunulan noktanın x konumunu verir
   y1=D_PANEL_KONUM_Y();//dokunulan noktanın y konumunu verir

   if(D_PANEL_DOKUNULDU_MU(50)==0)//panele dokunuldumu?
    {
     SAP1024_PIXEL(x1,y1,0);
    }

  SAP1024_PIXEL(x1,y1,1);
  delay_ms(5);
}

 

//Button and Location Codes
while(1)
 {
    if(D_PANEL_KORDINAT_KONTROL(100,100,10,10)==1)
      {
        SAP1024_YAZI_YAZMA(5,14,"resme bastin");
        delay_ms(500);
        SAP1024_LCD_TEXT_TEMIZLE();
      }

    inttoSTR(D_PANEL_KONUM_X(),yazi);
    SAP1024_YAZI_YAZMA(5,8,yazi);

    inttoSTR(D_PANEL_KONUM_Y(),yazi);
    SAP1024_YAZI_YAZMA(5,10,yazi);
}

 

//Full Codes
char SAPTRIS at trisd;//data portları
char SAPDATA_giris at portd;
char SAPDATA_cikis at latd;
sbit SAP1024_RD at RC1_bit ; //GLCD RD UCU BAĞLANTI PİNİ
sbit SAP1024_CE at rc2_bit ; //GLCD CE UCU BAĞLANTI PİNİ
sbit SAP1024_CD at Rc3_bit ; //GLCD C/D UCU BAĞLANTI PİNİ
sbit SAP1024_RST at Rc4_bit ; //GLCD RST UCU BAĞLANTI PİNİ
sbit SAP1024_FS at Rc5_bit ; //GLCD FS UCU BAĞLANTI PİNİ
sbit SAP1024_WR at RC0_bit ; //GLCD wr UCU BAĞLANTI PİNİ
sbit SAP1024_RD_Direction at TRISC1_bit; //GLCD RD UCU BAĞLANTI PİNİ
sbit SAP1024_CE_Direction at TRISC2_bit; //GLCD CE UCU BAĞLANTI PİNİ
sbit SAP1024_CD_Direction at TRISC3_bit; //GLCD C/D UCU BAĞLANTI PİNİ
sbit SAP1024_RST_Direction at TRISC4_bit; //GLCD RST UCU BAĞLANTI PİNİ
sbit SAP1024_FS_Direction at TRISC5_bit; //GLCD FS UCU BAĞLANTI PİNİ
sbit SAP1024_WR_Direction at TRISC0_bit; //GLCD FS UCU BAĞLANTI PİNİ

//DOKUNMATİK PANEL PİNLERİ//////////
sbit surucu_a at RA5_bit; //dokunmatik panel surucu_a pini
sbit surucu_b at RB4_bit; //dokunmatik panel surucu_b pini
sbit analog_x at RA0_bit; //dokunmatik panel analog port ucu pini
sbit analog_y at RA1_bit; //dokunmatik panel analog port ucu pini

sbit surucu_a_Direction at TRISA5_bit; // surucu_a pini
sbit surucu_b_Direction at TRISB4_bit; // surucu_b pini
sbit analog_x_Direction at TRISA0_bit; //analog port ucu pini
sbit analog_y_Direction at TRISA1_bit; //analog port ucu pini

void kalbire_et()
{
 do
 {
   SAP1024_YAZI_YAZMA(1,8,"1.Noktaya Dokunun");
   SAP1024_PIXEL((GENISLIK_D*20)/100,(YUKSEKLIK_D*80)/100,1);
 }while(D_PANEL_KALIBRASYON_NOKTA_1()!=1);
 sap1024_lcd_temizle();

 do
 {
   SAP1024_YAZI_YAZMA(1,8,"2.Noktaya Dokunun");
   SAP1024_PIXEL((GENISLIK_D*20)/100,(YUKSEKLIK_D*20)/100,1);
 }while(D_PANEL_KALIBRASYON_NOKTA_2()!=1);
 sap1024_lcd_temizle();

 do
 {
   SAP1024_YAZI_YAZMA(1,8,"3.Noktaya Dokunun");
   SAP1024_PIXEL((GENISLIK_D*80)/100,(YUKSEKLIK_D*20)/100,1);
 }while(D_PANEL_KALIBRASYON_NOKTA_3()!=1);
 sap1024_lcd_temizle();

 do
 {
   SAP1024_YAZI_YAZMA(1,8,"4.Noktaya Dokunun");
   SAP1024_PIXEL((GENISLIK_D*80)/100,(YUKSEKLIK_D*80)/100,1);
 }while(D_PANEL_KALIBRASYON_NOKTA_4()!=1);
 sap1024_lcd_temizle();
}
void main()
 {
   char yazi[8];
   int x1,y1;

 //GENEL PORT AYARLARI
 ADCON0=0x09;
 ADCON1&=0xF0;
 cmcon|=7;
 //------------------

 SAP1024_INIT(240,128,8);
 ADC_Init();
 D_PANEL_INIT(240,128,0,1);
 kalbire_et();
 SAP1024_DORTGEN(100,100,110,110,1,1);
 while(1)
 {
  x1=D_PANEL_KONUM_X();
  y1=D_PANEL_KONUM_Y();

   if(D_PANEL_DOKUNULDU_MU(50)==0)
     {
       SAP1024_PIXEL(x1,y1,0);
     }
  SAP1024_PIXEL(x1,y1,1);
  delay_ms(5); 

  if(D_PANEL_KORDINAT_KONTROL(100,100,10,10)==1)
    {
     SAP1024_YAZI_YAZMA(5,14,"resme bastin");
     delay_ms(500);
     SAP1024_LCD_TEXT_TEMIZLE();
    }

   inttoSTR(D_PANEL_KONUM_X(),yazi);
   SAP1024_YAZI_YAZMA(5,8,yazi);

   inttoSTR(D_PANEL_KONUM_Y(),yazi);
   SAP1024_YAZI_YAZMA(5,10,yazi);
 }
}

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Important Notes

• You must watch the video tutorials to see the implementation of the Code

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Technical Documents

• Touch Panel Library
• Touch Panel Library User’s Guide-English

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Document

• Calibration in touch-screen systems
• Calibration procedure for a resistive touchscreen system based on the STMPE811
• MMSE-Based Multipoint Calibration Algorithm for Touch Screen Applications 
• Study on Calibration Algorithm of Embedded Touch Screen
• BC546 Datasheet
• BC556 Datasheet
• Mikroelektronika’s Touch Panel

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This post is also available in: Türkçe (Turkish)