Using Keyboard with Microchip Graphics Library Author: Anton Alkh
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AN1227
Using Keyboard with Microchip Graphics Library
Author: Anton Alkhimenok Microchip Technology Inc. format graphics library message structure shown Example
EXAMPLE
INTRODUCTION
Graphics displays widely used many applications number products with displays grows every day. primary reason that Graphical User Interface (GUI) greatly simplify device. interface display with variety input devices, such keyboards, touch screens mice. Keyboards range from devices with several side buttons those enabling text entry. cost ability quickly enter data resulting frequent keyboards. Microchip Graphics Library simplifies design keyboard-based GUI, this application note will demonstrate. more information library, AN1136, "How Widgets Microchip Graphics Library".
MESSAGE STRUCTURE FORMAT
type, uiEvent, param1, param2
typedef struct BYTE BYTE SHORT SHORT GOL_MSG;
keyboard related definitions preceding example's fields given Table
TABLE
Field type
MESSAGE STRUCTURE FIELDS' DEFINITIONS
Description Bytes
type input device. keyboard, this value must TYPE_KEYBOARD.
MESSAGE INTERFACE
Microchip Graphics Library supports several kinds input devices, achieving that flexibility through message interface. interface structure containing information about input device events. input device firmware part library must implemented application. application must provide event information prescribed format pass data library's message manager. rest work done library with on-screen widgets displaying state automatically. code structure message manager function shown Example
uiEvent input event. keyboard kinds events: EVENT_KEYSCAN When param2 field contains scan code EVENT_KEYCODE When param2 field contains character code. param1 widget receiving message. This unique assigned application when object created. param2 scan code character code, depending value uiEvent field.
EXAMPLE
void
MESSAGE MANAGER FUNCTION PROTOTYPE
GOLMsg(GOL_MSG *pMsg)
Keyboard messages standard keyboard scan codes. Most Significant scan code defines state pressed released. Frequently used scan codes graphics library widgets listed Table constants definitions codes ScanCodes.h file included graphics library.
pMsg parameter pointer message structure filled input device.
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TABLE
Description Carriage Return Delete Back Space Tabulation Home Page Page Down Arrow Arrow Down Arrow Left Arrow Right Space
KEYBOARD SCAN CODES
Press Name Defined ScanCodes.h SCAN_CR_PRESSED SCAN_DEL_PRESSED SCAN_BS_PRESSED SCAN_TAB_PRESSED SCAN_HOME_PRESSED SCAN_END_PRESSED SCAN_PGUP_PRESSED SCAN_PGDOWN_PRESSED SCAN_UP_PRESSED SCAN_DOWN_PRESSED SCAN_LEFT_PRESSED SCAN_RIGHT_PRESSED SCAN_SPACE_PRESSED Code 0x1C 0x53 0x0E 0x0F 0x47 0x4F 0x49 0x51 0x48 0x50 0x4B 0x4D 0x39 Release Name Defined ScanCodes.h SCAN_CR_RELEASED SCAN_DEL_RELEASED SCAN_BS_RELEASED SCAN_TAB_RELEASED SCAN_HOME_RELEASED SCAN_END_RELEASED SCAN_PGUP_RELEASED SCAN_PGDOWN_RELEASED SCAN_UP_RELEASED SCAN_DOWN_RELEASED SCAN_LEFT_RELEASED SCAN_RIGHT_RELEASED SCAN_SPACE_RELEASED Code 0x9C 0xD3 0x8E 0x8F 0xC7 0xCF 0xC9 0xD1 0xC8 0xD0 0xCB 0xCD 0xB9
code keyboard message have different encoding. application must ensure that message's encoding matches used font widget receiving message. example, Edit widget ASCII encoded font, code keyboard message also must ASCII.
WIDGETS KEYBOARD MESSAGES
Each widget valid keyboard messages. Invalid messages result action. Some widgets such Window, Static Text, Picture, Progress Group cannot accept keyboard input. widget disabled state, ignores messages. Table summarizes keyboard messages different widgets.
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TABLE
Widget
MICROCHIP GRAPHICS LIBRARY KEYBOARD MESSAGES WIDGETS
Parameter Description (param2 field message structure) Carriage return pressed scan code (SCAN_CR_PRESSED constant) Space pressed scan code (SCAN_SPACE_PRESSED constant) Carriage return released scan code (SCAN_CR_RELEASED constant) Space released scan code (SCAN_SPACE_RELEASED constant) Carriage return pressed scan code (SCAN_CR_PRESSED constant) Space pressed scan code (SCAN_SPACE_PRESSED constant) Carriage return pressed scan code (SCAN_CR_PRESSED constant) Space pressed scan code (SCAN_SPACE_PRESSED constant) Character code edit assigned application when edit created.
Message from Input Device Translated Message Type Input Device Event Description Parameter Description Message Callback (the Type field message (the uiEvent field (param1 field message Function structure) message structure) structure) button pressed. (BTN_MSG_PRESSED constant) scan code event. (EVENT_KEYSCAN constant) button assigned application when button created.
Button
button released. (BTN_MSG_RELEASED constant)
Keyboard (TYPE_KEYBOARD constant)
Check
check checked. (BTN_MSG_CHECKED constant)
check
unchecked. (BTN_MSG_
Keyboard (TYPE_KEYBOARD constant)
scan code event. (EVENT_KEYSCAN constant)
check assigned application when check created.
UNCHECKED constant)
same radio button group checked. (RB_MSG_CHECKED Keyboard constant) (TYPE_KEYBOARD constant)
Radio Button
scan code event. (EVENT_KEYSCAN constant)
radio button group assigned application when radio button created.
Edit
character added edit box. (EB_MSG_CHAR constant) Keyboard (TYPE_KEYBOARD constant) last character removed from edit box. (EB_MSG_DEL constant)
Character code event. (EVENT_KEYCODE constant) scan code event. (EVENT_KEYSCAN constant)
AN1227
Back space pressed scan code (SCAN_BS_PRESSED constant)
TABLE
Widget
MICROCHIP GRAPHICS LIBRARY KEYBOARD MESSAGES WIDGETS (CONTINUED)
Parameter Description (param2 field message structure)
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AN1227
Message from Input Device Translated Message Type Input Device Event Description Parameter Description Message Callback (the Type field message (the uiEvent field (param1 field message Function structure) message structure) structure) Slider position incremented. (SLD_MSG_INC constant) Keyboard (TYPE_KEYBOARD constant) scan code event. (EVENT_KEYSCAN constant)
Slider
Slider position decremented. (SLD_MSG_DEC constant)
Arrow down pressed scan code (SCAN_UP_PRESSED constant) Arrow right pressed scan code slider assigned application (SCAN_LEFT_PRESSED constant) when slider created. Arrow pressed scan code (SCAN_DOWN_PRESSED constant) Arrow left pressed scan code (SCAN_RIGHT_PRESSED constant) Arrow pressed scan code (SCAN_UP_PRESSED constant) Arrow down pressed scan code (SCAN_DOWN_PRESSED constant) Carriage return pressed scan code (SCAN_CR_PRESSED constant) Space pressed scan code (SCAN_SPACE_PRESSED constant)
Current item mark moved next item. (LB_MSG_MOVE constant) scan code event. (EVENT_KEYSCAN constant) list assigned application when list created.
List
Current item selected. (LB_MSG_SEL constant)
Keyboard (TYPE_KEYBOARD constant)
Dial Group Meter Picture Progress Static Text Window Keyboard messages supported these objects.
AN1227
Example shows pass button's "press" "release" events library. keyboard key, switch connected port used. switch pressed, presented this port. released state, read from this port.
EXAMPLE
main(void) GOL_MSG msg;
PASSING BUTTON EVENTS GRAPHICS LIBRARY
1111 button unique
#define BUTTON1_ID
message interface structure, should filled keyboard driver passed message manager previous state
BYTE
previousKey1State; initialize keyboard TRISDbits.TRISD6 previousKey1State PORTDbits.RD6; GOLInit(); BtnCreate( BUTTON1_ID, 0,40, 100,90, BTN_DRAW, NULL, "Released", NULL while(1)
port input previous state equals current state initialize graphics library create button widget button unique left, corner coordinates right, bottom corner corner radius zero, it's square button will dislayed after creation bitmap text released state default color scheme used
if(GOLDraw()) drawing manager display widgets Keyboard driver if(PORTDbits.RD6 previousKey1State) check button changed state if(previousKey1State) equals zero means pressed msg.type TYPE_KEYBOARD; msg.uiEvent EVENT_KEYSCAN; msg.param1 BUTTON1_ID; msg.param2 SCAN_CR_PRESSED; }else{ equals means released msg.type TYPE_KEYBOARD; msg.uiEvent EVENT_KEYSCAN; msg.param1 BUTTON1_ID; msg.param2 SCAN_CR_RELEASED; else state changed previousKey1State previousKey1State; pass message graphics library GOLMsg(&msg); while return main WORD GOLMsgCallback(WORD objMsg, OBJ_HEADER* pObj, GOL_MSG* pMsg) Application should process messages here return process message default GOLMessageCallback
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MESSAGE CALLBACK FUNCTION
After library's message manager, GOLMsg(.), received message from input device, graphics library finds widgets affected active link list uses special callback function program reacts event. This function must implemented application. Example shows this function's prototype.
EXAMPLE
MESSAGE CALLBACK FUNCTION PROTOTYPE
WORD GOLMsgCallback(WORD objMsg, OBJ_HEADER* pObj, GOL_MSG* pMsg); first parameter objMsg translated message. graphics library parses message from input device translates into form particular widget. example, keyboard sends button carriage return pressed code, library returns translated message, BUTTON PRESSED (BTN_MSG_PRESSED constant), message callback function objMsg parameter. second parameter, pObj, pointer widget affected message. third parameter, pMsg, pointer original message from input device. This information enough application perform action event. graphics library default action events each widget. (For button, library display pressed released state). callback function returns non-zero, message object will processed default. returned, library will perform default action. Example adds application code previous example processing messages button with BUTTON1_ID. This example shows code changing text face button "pressed" "released" events. GOLMsgCallback() returns enable default action button which change state from released pressed pressed released.
EXAMPLE
CHANGING BUTTON TEXT PRESSED RELEASED EVENTS
WORD GOLMsgCallback(WORD objMsg, OBJ_HEADER* pObj, GOL_MSG* pMsg) Application should process messages here if(GetobjID(pObj) BUTTON1_ID) if(objMsg BTN_MSG_PRESSED) BtnSetText(pObj,"Pressed"); if(objMsg BTN_MSG_RELEASED) BtnSetText(pObj,"Released"); return process message default GOLMessageCallback button with BUTTON_ID receiving message
text pressed state
text released state
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AN1227
KEYBOARD FOCUS
keyboard focus determines which widget receives information typed keyboard. Microchip Graphics Library shows which widget focus putting dashed rectangle around Focus especially useful when number widgets greater than number keyboard keys. such cases, some keys assigned navigate between controls screen. Widgets supporting keyboard cannot accept focus. allow focus, USE_FOCUS compile-time option must defined GraphicsConfig.h file. another type input device, such touch screen, used simultaneously with keyboard, second device will move keyboard focus automatically active widget. following functions available control focus.
OBJ_HEADER *GOLGetFocusNext()
This function returns pointer next object active list that capable receiving keyboard input. there such object, NULL returned.
void GOLSetFocus (OBJ_HEADER* object)
This function sets keyboard input focus object. object cannot accept keyboard messages, focus will changed. This function resets focused state object that previously focus, sets focused state required object marks objects redrawn.
OBJ_HEADER *GOLGetFocus(void)
This macro returns pointer object receiving keyboard input. there object focus, NULL returned. Example illustrates focus adding second third button widgets. initial state third button widget disabled such that will accept keyboard focus. second keyboard key, connected port RD13, also added move input focus between widgets current screen.
WORD GOLCanBeFocused (OBJ_HEADER* object)
This function returns non-zero object focused. Only button, check box, radio button, slider, edit list accept focus. object disabled, cannot focused state.
EXAMPLE
USING FOCUS WITH THREE BUTTON WIDGETS
1111 2222 3333 button unique button unique button unique
#define BUTTON1_ID #define BUTTON2_ID #define BUTTON3_ID main(void) GOL_MSG msg;
OBJ_HEADER* pFocusedObj; BYTE BYTE previousKey1State; previousKey2State; initialize keyboard's keys TRISDbits.TRISD6 previousKey1State PORTDbits.RD6; TRISDbits.TRISD13 previousKey2State PORTDbits.RD13; GOLInit();
message interface structure, should filled keyboard driver passed message manager temporary variable widget receiving keyboard focus previous state button previous state button
port previous port previous
input state equals current state RD13 input state equals current state
initialize graphics library
2008 Microchip Technology Inc.
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EXAMPLE USING FOCUS WITH THREE BUTTON WIDGETS (CONTINUED)
button unique left, corner coordinates right, bottom corner corner radius zero, it's square button will dislayed after creation bitmap text released state default color scheme used create button widgets BtnCreate( BUTTON1_ID, 10,40, 110,90, BTN_DRAW, NULL, "Released", NULL BtnCreate( BUTTON2_ID, 10,100, 110,150, BTN_DRAW, NULL, "Button NULL BtnCreate( BUTTON3_ID, 10,160, 110,210, BTN_DRAW|BTN_DISABLED, NULL, "Disabled", NULL pFocusedObj NULL; while(1) if(GOLDraw()) Keyboard driver if(GOLGetFocus() NULL) check button changed state if(PORTDbits.RD6 previousKey1State) if(previousKey1State) equals zero means button pressed msg.type TYPE_KEYBOARD; msg.uiEvent EVENT_KEYSCAN; focused button will receive message msg.param1 GetObjID(GOLGetFocus()); msg.param2 SCAN_CR_PRESSED; }else{ equals means button released msg.type TYPE_KEYBOARD; msg.uiEvent EVENT_KEYSCAN; focused button will receive message msg.param1 GetObjID(GOLGetFocus()); msg.param2 SCAN_CR_RELEASED; else drawing manager display widgets
button unique left, corner coordinates right, bottom corner corner radius zero, it's square button will dislayed after creation bitmap text default color scheme used
button unique left, corner coordinates right, bottom corner corner radius zero, it's square button will dislayed disabled after creation bitmap text default color scheme used
there widgets focus
there's widget focus send message
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EXAMPLE USING FOCUS WITH THREE BUTTON WIDGETS (CONTINUED)
state button changed previousKey1State previousKey1State; pass message graphics ibrary GOLMsg(&msg); continue; check button changed state if(PORTDbits.RD13 previousKey2State) if(previousKey2State) RD13 equals zero means button pressed object focused next pFocusedObj GOLGetFocusNext(); move focus GOLSetFocus(pFocusedObj); }else{ RD13 equals means button released else state button changed previousKey2State previousKey2State; pass message graphics library GOLMsg(&msg); while return main WORD GOLMsgCallback(WORD objMsg, OBJ_HEADER* pObj, GOL_MSG* pMsg) Application should process messages here if(GetobjID(pObj) BUTTON1_ID) if(objMsg BTN_MSG_PRESSED) BtnSetText(pObj,"Pressed"); if(objMsg BTN_MSG_RELEASED) BtnSetText(pObj,"Released"); return process message default GOLMessageCallback button with BUTTON_ID receiving message
text pressed state
text released state
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CONCLUSION
type keyboard easily integrated into application using Microchip Graphics Library. This done with message interface, widgets messages, message processing keyboard focus control.
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