Touch Panel TFT Library
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Touch Panel TFT Library

The mikroPascal PRO for PIC32 provides a library for working with Touch Panel for TFT.

Library Dependency Tree

Touch Panel TFT Library Dependency Tree

External dependencies of Touch Panel TFT Library

The following variables must be defined in all projects using Touch Panel TFT Library: Description : Example :
var DriveX_Left : sbit; sfr; atomic; external; DriveX_Left line. var DriveX_Left : sbit at LATB13_bit;
var DriveX_Right : sbit; sfr; atomic; external; DriveX_Right line. var DriveX_Right : sbit at LATB11_bit;
var DriveY_Up : sbit; sfr; atomic; external; DriveY_Up line. var DriveY_Up : sbit at LATB12_bit;
var DriveY_Down : sbit; sfr; atomic; external; DriveY_Down line. var DriveY_Down : sbit at LATB10_bit;
var DriveX_Left_Direction : sbit; sfr; atomic; external; Direction of the DriveX_Left pin. var DriveX_Left_Direction : sbit at TRISB13_bit;
var DriveX_Right_Direction : sbit; sfr; atomic; external; Direction of the DriveX_Right pin. var DriveX_Right_Direction : sbit at TRISB11_bit;
var DriveY_Up_Direction : sbit; sfr; atomic; external; Direction of the DriveY_Up pin. var DriveY_Up_Direction : sbit at TRISB12_bit;
var DriveY_Down_Direction : sbit; sfr; atomic; external; Direction of the DriveY_Down pin. var DriveY_Down_Direction : sbit at TRISB10_bit;

Library Routines

TP_TFT_Init

Prototype

procedure TP_TFT_Init(display_width : word; display_height : word; readX_ChNo : byte; readY_ChNo : byte);
Description

Initialize TFT touch panel display. Default touch panel ADC threshold value is set to 900.
Parameters
  • display_width: set display width.
  • display_height: set display height.
  • readX_ChNo: read X coordinate from desired ADC channel.
  • readY_ChNo: read Y coordinate from desired ADC channel.
Returns

Nothing.
Requires

Before calling this function initialize ADC module.
Example 
ADC1_Init();               // Initalize ADC module
TP_TFT_Init(320, 240, 13, 12); // Initialize touch panel
Notes

None.

TP_TFT_Rotate

Prototype

procedure TP_TFT_Rotate(rotate : byte);
Description

Rotates touch panel by 180 degrees.
Parameters
  • rotate: set display width. Valid values : 0 - don't rotate, 1 - rotate by 180 degrees.
Returns

Nothing.
Requires

Nothing.
Example 
TP_TFT_Rotate(1);   // rotate Touch Panel by 180 degrees
Notes

None.

TP_TFT_Set_ADC_Threshold

Prototype

procedure TP_TFT_Set_ADC_Threshold(threshold : word);
Description

Set custom ADC threshold value, call this function after TP_TFT_Init.
Parameters
  • threshold: custom ADC threshold value.
Returns

Nothing.
Requires

TP_TFT_Init has to be called before using this routine.
Example 
TP_TFT_Set_ADC_Threshold(900);    // Set touch panel ADC threshold
Notes

None.

TP_TFT_Press_Detect

Prototype

function TP_TFT_Press_Detect() : byte;
Description

Detects if the touch panel has been pressed.
Parameters

None.
Returns
  • 1 - if touch panel is pressed.
  • 0 - otherwise.
Requires

Global variables :

  • DriveX_Left: DriveX_Left pin.
  • DriveX_Right: DriveX_Right pin.
  • DriveY_Up: DriveY_Up pin.
  • DriveY_Down: DriveY_Down pin.
  • DriveX_Left_Direction: Direction of DriveX_Left pin.
  • DriveX_Right_Direction: Direction of DriveX_Right pin.
  • DriveY_Up_Direction: Direction of DriveY_Up pin.
  • DriveY_Down_Direction: Direction of DriveY_Down pin.
must be defined before using this function.
Example 
// Touch Panel module connections
var DriveX_Left : sbit at LATB13_bit;
var DriveX_Right : sbit at LATB11_bit;
var DriveY_Up : sbit at LATB12_bit;
var DriveY_Down : sbit at LATB10_bit;
var DriveX_Left_Direction : sbit at TRISB13_bit;
var DriveX_Right_Direction : sbit at TRISB11_bit;
var DriveY_Up_Direction : sbit at TRISB12_bit;
var DriveY_Down_Direction : sbit at TRISB10_bit;
// End Touch Panel module connections

if (TP_TFT_Press_Detect() <> 0) then
  begin
  ...
  end;
Notes

None.

TP_TFT_Get_Coordinates

Prototype

function TP_TFT_Get_Coordinates(x_coordinate : ^word; y_coordinate : ^word) : byte;
Description

Get touch panel coordinates and store them in x_coordinate and y_coordinate parameters.
Parameters
  • x_coordinate: x coordinate of the place of touch.
  • y_coordinate: y coordinate of the place of touch.
Returns
  • 0 - if reading is within display dimension range.
  • 1 - if reading is out of display dimension range.
Requires

Nothing.
Example 
if (TP_TFT_Get_Coordinates(@x_coord, @y_coord) = 0) then
  begin
  ...
  end;
Notes

None.

TP_TFT_Calibrate_Min

Prototype

procedure TP_TFT_Calibrate_Min();
Description

Calibrate bottom left corner of the touch Panel.
Parameters

None.
Returns

Nothing.
Requires

Nothing.
Example 
TP_TFT_Calibrate_Min();    // Calibration of bottom left corner
Notes

None.

TP_TFT_Calibrate_Max

Prototype

procedure TP_TFT_Calibrate_Max();
Description

Calibrate upper right corner of the touch Panel.
Parameters

None.
Returns

Nothing.
Requires

Nothing.
Example 
TP_TFT_Calibrate_Max();    // Calibration of upper right corner
Notes

None.

TP_TFT_Get_Calibration_Consts

Prototype

procedure TP_TFT_Get_Calibration_Consts(x_min : ^word; x_max : ^word; y_min : ^word; y_max : ^word);
Description

Gets calibration constants after calibration is done and stores them in x_min, x_max, y_min and y_max parameters.
Parameters
  • x_min: x coordinate of the bottom left corner of the working area.
  • x_max: x coordinate of the upper right corner of the working area.
  • y_min: y coordinate of the bottom left corner of the working area.
  • y_max: y coordinate of the upper right corner of the working area.
Returns

Nothing.
Requires

Nothing.
Example 
TP_TFT_Get_Calibration_Consts(@x_min, @y_min, @x_max, @y_max);    // Get calibration constants
Notes

None.

TP_TFT_Set_Calibration_Consts

Prototype

procedure TP_TFT_Set_Calibration_Consts(x_min : word; x_max : word; y_min : word; y_max : word);
Description

Sets calibration constants.
Parameters
  • x_min: x coordinate of the bottom left corner of the working area.
  • x_max: x coordinate of the upper right corner of the working area.
  • y_min: y coordinate of the bottom left corner of the working area.
  • y_max: y coordinate of the upper right corner of the working area.
Returns

Nothing.
Requires

Nothing.
Example 
TP_TFT_Set_Calibration_Consts(173, 776, 75, 760);    // Set calibration constants
Notes

None.
Copyright (c) 2002-2012 mikroElektronika. All rights reserved.
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