Touch Screen Library - Versionsgeschichte

Mat: /* API */

2019-07-06T17:34:08Z

‎API

Mat am 21. April 2015 um 14:56 Uhr

2015-04-21T14:56:49Z

Mat am 21. April 2015 um 14:54 Uhr

2015-04-21T14:54:36Z

Mat: /* Sample */

2014-11-23T23:55:34Z

‎Sample

Mat am 23. November 2014 um 23:39 Uhr

2014-11-23T23:39:13Z

Mat: /* Overview */

2014-11-23T17:38:14Z

‎Overview

Mat am 23. November 2014 um 17:30 Uhr

2014-11-23T17:30:16Z

Mat am 23. November 2014 um 04:27 Uhr

2014-11-23T04:27:37Z

Mat am 21. November 2014 um 21:22 Uhr

2014-11-21T21:22:02Z

Mat am 21. November 2014 um 20:50 Uhr

2014-11-21T20:50:53Z

@@ Zeile 119: / Zeile 119: @@
 * 2: 180°
 * 3: 270°
-If the touch screen supports rotation, the transformed screen coordinates need to be rotated to. The rotation information needs to be provided with this variable. It can be declared in the main application, above the ''$include'' statement (for example as an overlay to the display driver's rotation variable), if not set, it is declared automatically.
+If the touch screen supports rotation, the transformed screen coordinates need to be rotated too. The rotation information needs to be provided with this variable. It can be declared in the main application, above the ''$include'' statement (for example as an overlay to the display driver's rotation variable), if not set, it is declared automatically.
 <pre>Dim Touch_rotation As Byte</pre>
@@ Zeile 141: / Zeile 141: @@
 Returns ''True'' (1) if the touch screen has been clicked (delta between first and last point below threshold and touch screen released), otherwise returns ''False'' (0). The coordinate variables are updated.
 <pre>Function Touch_click() As Byte</pre>
 ===Other Display Types===

← Nächstältere Version		Version vom 21. April 2015, 14:56 Uhr
Zeile 3:		Zeile 3:

	[https://youtu.be/eGcUwT6J5nE?t=2m47s Demo Video]		[https://youtu.be/eGcUwT6J5nE?t=2m47s Demo Video]
		+
		+	[http://www.mcselec.com/index2.php?option=com_forum&Itemid=59&page=viewtopic&t=12623 Forum Thread]

	'''Features:'''		'''Features:'''

@@ Zeile 1: / Zeile 1: @@
 ==Overview==
 Based on the Appnote [http://www.atmel.com/Images/doc8091.pdf AVR341 - Four and five-wire Touch Screen Controller] by Atmel, this library handles everything needed to use a 4-wire resistive touchscreen in Bascom.
 '''Features:'''
@@ Zeile 223: / Zeile 225: @@
 <paypal>1</paypal>
 [[About|See here]] for more informations
 == Download ==
-* [http://www.braunecker.at/downloads/touch/4WireResistiveTouch.zip 4-wire Resistive Touch Screen Library 1.0]
+* [http://www.braunecker.at/downloads/touch/4WireResistiveTouch.zip 4-wire Resistive Touch Screen Library 1.1]

@@ Zeile 183: / Zeile 183: @@
 ' Touch screen library and settings
 #if _xmega = True
     Const Touch_ctrl_port = Varptr( "Porta")
@@ Zeile 216: / Zeile 218: @@
     End If
 Loop</pre>
 == Donate ==

@@ Zeile 11: / Zeile 11: @@
 * Click/Drag detection
 * ATXmega, ATmega (untested)
 ==How to use==
 Before including the library, a display has to be set up (for the calibration routine draw functions) and the settings (below) need to be done.
 <pre>Config Graphlcd =
@@ Zeile 95: / Zeile 95: @@
 Maximum speed in pixels/sec (delta between last and actual coordinates, also applied on the raw ADC values, same as for Click/Drag detection):
 <pre>Const Touch_max_delta = 3000</pre>
 ===API===
@@ Zeile 215: / Zeile 216: @@
     End If
 Loop</pre>
 == Donate ==

@@ Zeile 4: / Zeile 4: @@
 '''Features:'''
 * Interrupt-controlled sampling
-* Touch contact pressure measurement
+* Touch contact resistance measurement
 * Adjustable sampling rate
 * Filtering
@@ Zeile 11: / Zeile 11: @@
 * Click/Drag detection
 * ATXmega, ATmega (untested)
 ==How to use==

@@ Zeile 102: / Zeile 102: @@
 Dim Touch_newsample As Byte
 Dim Touch_sample_invalid As Bit
-Dim Touch_clicked As Byte
+Dim Touch_clicked As Bit
 Dim Touch_dragging As Bit
 Dim Touch_calibrated As Bit</pre>
@@ Zeile 153: / Zeile 153: @@
 To connect to an ATmega controller, simply connect the pins of the ADC port straight to the sense lines (X-, Y+, Y-; hard coded to PortA), no additional components are needed. X+ has to be connected to an external interrupt pin (''INT0'', to use another, see above).
-The ADC module of the ATXmega controllers can't sample at the CPU's voltage level, therefore a few additional components are needed to interface to the touch screen. The reference voltage for the ADC module is set to VCC/1,6 (VCC 3,3V: 2,06V), the resistor network yields a maximum voltage of about 1,98V (VCC 3,3V). To ensure correct measurements, the sample & hold circuit of the ADC module needs a low signal impedance, that is the job of the operational amplifier (any standard opamp should do, here it is a ''TL274'').
+The ADC module of the ATXmega controllers can't sample at the CPU's voltage level, therefore a few additional components are needed to interface to the touch screen. The reference voltage for the ADC module is set to VCC/1,6 (VCC 3,3V: 2,06V), the resistor network yields a maximum voltage of about 1,98V (VCC 3,3V). Other resistor combinations should work as well, the calibration routine does the rest, but the overall impedance should be a few hundred kiloohms. To ensure correct measurements, the sample & hold circuit of the ADC module needs a low signal impedance, that is the job of the operational amplifier (any standard opamp should do, here it is a ''TL274'').
 The schematic also shows the connections of the display controller I've used and the backlight control circuit.
@@ Zeile 161: / Zeile 159: @@
 ==Sample==
-This sample works for both ATXmega and ATmega controllers, just change the ''$regfile'' statement. It draws a line between measured coordinates.
+This sample works for both ATXmega and ATmega controllers, just change the ''$regfile'' statement. Every time, at the initialization, the screen calibration is performed (for demonstration purposes, normally the values ares stored in EEPROM and loaded automatically). In the main loop, it draws a consecutive line between measured coordinates.
 <pre>$regfile = "xm128a1def.dat"
 '$regfile = "m128def.dat"
@@ Zeile 173: / Zeile 171: @@
     Config Osc = Enabled , 32mhzosc = Enabled , 32khzosc = Enabled
     Config Sysclock = 32mhz , Prescalea = 1 , Prescalebc = 1_1
-    Osc_dfllctrl.0 = 1                                                              'enable
+    Osc_dfllctrl.0 = 1
-    Dfllrc32m_ctrl.0 = 1                                                            'enable
+    Dfllrc32m_ctrl.0 = 1
 #else
     $crystal = 16000000
@@ Zeile 226: / Zeile 224: @@
 == Download ==
-* [http://www.braunecker.at/downloads/touch/ 4-wire Resistive Touch Screen Library 1.0]
+* [http://www.braunecker.at/downloads/touch/4WireResistiveTouch.zip 4-wire Resistive Touch Screen Library 1.0]

@@ Zeile 59: / Zeile 59: @@
 Const Touch_resistance_y = 600</pre>
-Control port for touch screen (standard I/O port):
+If the contact resistance measurement is enabled, an additional sanity check is performed, coordinates are only valid if the resistance is below this value (in Ohms):
-<pre>Touch_ctrl_port Alias Porta</pre>
+<pre>Const Touch_max_resistance = 1000</pre>
-(ATmega only) Port of standby interrupt pin ''X+'':
+Control port for touch screen (ATXmega: I/O port, ATmega: Port of X+ INT, other wires connected to PortA):
-<pre>Touch_int_port alias Portb</pre>
+<pre>Const Touch_ctrl_port = Varptr( "Portb") </pre>
 Control port pin connections:
@@ Zeile 108: / Zeile 108: @@
 '''Coordinates:'''
 <pre>Dim Touch_x As Word , Touch_y As Word
-#if Touch_measure_resistance >= 1
+Dim Touch_r As Word          ' only available if contact resistance measurement is enabled</pre>
 '''Display rotation:'''
@@ Zeile 146: / Zeile 144: @@
 ===Change Timer-, ADC-Hardware-Module and Pin Interrupt===
-To simplify modifications, all hardware-related functions and settings are kept at a single location, for both ATmega and ATXmega, starting at around line 400, section ''Portability''.
+To simplify modifications, all hardware-related functions and settings are kept at a single location, for both ATmega and ATXmega, in section ''Portability'', marked with ''# XMEGA #'' and ''# ATMEGA #''.
 For the ATmega, ''TIMER0'', the ''ADC'' module and ''INT0'' are used, the ATxmega is set up to use ''TCC1'', ''ADCA.CH0'', and ''PORT.INT0''.
@@ Zeile 153: / Zeile 151: @@
 ===Electrical Connection===
 [[File:lcd-connections.jpg|thumb|frameless|LCD connection schematic]]
-To connect to an ATmega controller, simply connect the pins of the ADC port straight to the sense lines (X-, Y+, Y-), no additional components are needed. X+ has to be connected to an external interrupt pin (''INT0'', to use another, see above).
+To connect to an ATmega controller, simply connect the pins of the ADC port straight to the sense lines (X-, Y+, Y-; hard coded to PortA), no additional components are needed. X+ has to be connected to an external interrupt pin (''INT0'', to use another, see above).
 The ADC module of the ATXmega controllers can't sample at the CPU's voltage level, therefore a few additional components are needed to interface to the touch screen. The reference voltage for the ADC module is set to VCC/1,6 (VCC 3,3V: 2,06V), the resistor network yields a maximum voltage of about 1,98V (VCC 3,3V). To ensure correct measurements, the sample & hold circuit of the ADC module needs a low signal impedance, that is the job of the operational amplifier (any standard opamp should do, here it is a ''TL274'').
@@ Zeile 163: / Zeile 161: @@
 ==Sample==
 == Donate ==

@@ Zeile 61: / Zeile 61: @@
 Control port for touch screen (standard I/O port):
 <pre>Touch_ctrl_port Alias Porta</pre>
 Control port pin connections:
@@ Zeile 68: / Zeile 71: @@
 Const Touch_pin_yn = 3</pre>
-ADC port pin connections (XMega: Adca is used, AtMega: can be the same as the control port pins if control port is also the ADC port):
+(ATXmega only) ADC port pin connections (Adca is used):
 <pre>Const Touch_pin_xn_adc = 4
 Const Touch_pin_yn_adc = 5
@@ Zeile 150: / Zeile 153: @@
 ===Electrical Connection===
 [[File:lcd-connections.jpg|thumb|frameless|LCD connection schematic]]
-To connect to an ATmega controller, simply connect the pins of the ADC port straight to the sense lines (X-, Y+, Y-), no additional components are needed. X+ has to be connected to an external interrupt pin (''INT0'', to use ''INT1'' see above), Y- can be any I/O pin if contact resistance measurement method 2 is not used, an ADC pin is needed for method 2.
+To connect to an ATmega controller, simply connect the pins of the ADC port straight to the sense lines (X-, Y+, Y-), no additional components are needed. X+ has to be connected to an external interrupt pin (''INT0'', to use another, see above).
 The ADC module of the ATXmega controllers can't sample at the CPU's voltage level, therefore a few additional components are needed to interface to the touch screen. The reference voltage for the ADC module is set to VCC/1,6 (VCC 3,3V: 2,06V), the resistor network yields a maximum voltage of about 1,98V (VCC 3,3V). To ensure correct measurements, the sample & hold circuit of the ADC module needs a low signal impedance, that is the job of the operational amplifier (any standard opamp should do, here it is a ''TL274'').