Touch Panel Library
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Touch Panel Library

The mikroC PRO for ARM provides a library for working with Touch Panel.

Library Dependency Tree

Touch Panel Library Dependency Tree

External dependencies of Touch Panel Library

Stellaris

The following variables must be defined in all projects using Touch Panel Library: Description : Example :
extern sfr sbit DriveA; DriveA line. sbit DriveA at GPIO_PORTB_DATA4_bit;
extern sfr sbit DriveB; DriveB line. sbit DriveB at GPIO_PORTE_DATA0_bit;
extern sfr sbit DriveA_Direction; Direction of the DriveA pin. sbit DriveA_Direction at GPIO_PORTB_DIR4_bit;
extern sfr sbit DriveB_Direction; Direction of the DriveB pin. sbit DriveB_Direction at GPIO_PORTE_DIR0_bit;

STM32

The following variables must be defined in all projects using Touch Panel Library: Description : Example :
extern sfr sbit DriveA; DriveA line. sbit DriveA at GPIOB_ODR.B1;
extern sfr sbit DriveB; DriveB line. sbit DriveB at GPIOB_ODR.B0;

Library Routines

TP_Init

Prototype

void TP_Init(unsigned int display_width, unsigned int display_height, unsigned int readX_ChNo, unsigned int readY_ChNo);
Description

Initialize touch panel display. Default touch panel ADC threshold value is set to 3900.
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_Init(128, 64, 6, 7);    // Initialize touch panel, dimensions 128x64
Notes

None.

TP_Set_ADC_Threshold

Prototype

void TP_Set_ADC_Threshold(unsigned int threshold);
Description

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

Nothing.
Requires

TP_Init has to be called before using this routine.
Example 
TP_Set_ADC_Threshold(3900);    // Set touch panel ADC threshold
Notes

None.

TP_Press_Detect

Prototype

char TP_Press_Detect();
Description

Detects if the touch panel has been pressed.
Parameters

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

Global variables :

  • DriveA: DriveA.
  • DriveB: DriveB.
  • DriveA_Direction: Direction of DriveA pin.
  • DriveB_Direction: Direction of DriveB pin.
must be defined before using this function.
Example

Stellaris

// Touch Panel module connections
sbit DriveA at GPIO_PORTB_DATA4_bit;
sbit DriveB at GPIO_PORTE_DATA0_bit;
sbit DriveA_Direction at GPIO_PORTB_DIR4_bit;
sbit DriveB_Direction at GPIO_PORTE_DIR0_bit;
// End Touch Panel module connections

if (TP_Press_Detect()) {
  ...
}

STM32

// Touch Panel module connections
sbit DriveA at GPIOB_ODR.B1;
sbit DriveB at GPIOB_ODR.B0;
// End Touch Panel module connections

if (TP_Press_Detect()) {
  ...
}
Notes

None.

TP_Get_Coordinates

Prototype

char TP_Get_Coordinates(unsigned int *x_coordinate, unsigned int *y_coordinate);
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_Get_Coordinates(&x_coord, &y_coord) == 0) {
 ...
}
Notes

None.

TP_Calibrate_Bottom_Left

Prototype

void TP_Calibrate_Bottom_Left();
Description

Calibrate bottom left corner of the touch Panel.
Parameters

None.
Returns

Nothing.
Requires

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

None.

TP_Calibrate_Upper_Right

Prototype

void TP_Calibrate_Upper_Right();
Description

Calibrate upper right corner of the touch panel.
Parameters

None.
Returns

Nothing.
Requires

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

None.

TP_Get_Calibration_Consts

Prototype

void TP_Get_Calibration_Consts(unsigned int *x_min, unsigned int *x_max, unsigned int *y_min, unsigned int *y_max);
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_Get_Calibration_Consts(&x_min, &y_min, &x_max, &y_max);    // Get calibration constants
Notes

None.

TP_Set_Calibration_Consts

Prototype

void TP_Set_Calibration_Consts(unsigned int x_min, unsigned int x_max, unsigned int y_min, unsigned int y_max);
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_Set_Calibration_Consts(148, 3590, 519, 3370);    // Set calibration constants
Notes

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