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USB_Host_Shield_2.0/max_LCD.cpp at master · felis/USB_Host_Shield_2.0 · GitHub
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/*
Copyright (C) 2011 Circuits At Home, LTD. All rights reserved.
This software may be distributed and modified under the terms of the GNU
General Public License version 2 (GPL2) as published by the Free Software
Foundation and appearing in the file GPL2.TXT included in the packaging of
this file. Please note that GPL2 Section 2[b] requires that all works based
on this software must also be made publicly available under the terms of
the GPL2 ("Copyleft").
Contact information
-------------------
Circuits At Home, LTD
Web : http://www.circuitsathome.com
e-mail : support@circuitsathome.com
*/
#
include
"
max_LCD.h
"
#
include
<
string.h
>
//
pin definition and set/clear
#
define
RS
0x04
//
RS pin
#
define
E
0x08
//
E pin
#
define
SET_RS
lcdPins |=
RS
#
define
CLR_RS
lcdPins &= ~
RS
#
define
SET_E
lcdPins |= E
#
define
CLR_E
lcdPins &= ~E
#
define
SENDlcdPins
() pUsb->
gpioWr
( lcdPins )
#
define
LCD_sendcmd
(
a
) {
CLR_RS
; \
sendbyte
(a); \
}
#
define
LCD_sendchar
(
a
) {
SET_RS
; \
sendbyte
(a); \
}
static
uint8_t
lcdPins;
//
copy of LCD pins
Max_LCD::Max_LCD
(
USB
*pusb) : pUsb(pusb) {
lcdPins =
0
;
}
void
Max_LCD::init
() {
_displayfunction =
LCD_4BITMODE
|
LCD_1LINE
| LCD_5x8DOTS;
//
MAX3421E::gpioWr(0x55);
begin
(
16
,
1
);
}
void
Max_LCD::begin
(
uint8_t
cols
__attribute__
((unused)), uint8_t lines, uint8_t dotsize) {
if
(lines >
1
) {
_displayfunction |=
LCD_2LINE
;
}
_numlines = lines;
_currline =
0
;
//
for some 1 line displays you can select a 10 pixel high font
if
((dotsize !=
0
) && (lines ==
1
)) {
_displayfunction |= LCD_5x10DOTS;
}
//
SEE PAGE 45/46 FOR INITIALIZATION SPECIFICATION!
//
according to datasheet, we need at least 40ms after power rises above 2.7V
//
before sending commands. Arduino can turn on way befer 4.5V so we'll wait 50
delayMicroseconds
(
50000
);
lcdPins =
0x30
;
SET_E
;
SENDlcdPins
();
CLR_E
;
SENDlcdPins
();
delayMicroseconds
(
10000
);
//
wait min 4.1ms
//
second try
SET_E
;
SENDlcdPins
();
CLR_E
;
SENDlcdPins
();
delayMicroseconds
(
10000
);
//
wait min 4.1ms
//
third go!
SET_E
;
SENDlcdPins
();
CLR_E
;
SENDlcdPins
();
delayMicroseconds
(
10000
);
//
finally, set to 4-bit interface
lcdPins =
0x20
;
//
SET_RS;
SET_E
;
SENDlcdPins
();
//
CLR_RS;
CLR_E
;
SENDlcdPins
();
delayMicroseconds
(
10000
);
//
finally, set # lines, font size, etc.
command
(
LCD_FUNCTIONSET
| _displayfunction);
//
turn the display on with no cursor or blinking default
_displaycontrol =
LCD_DISPLAYON
|
LCD_CURSOROFF
|
LCD_BLINKOFF
;
display
();
//
clear it off
clear
();
//
Initialize to default text direction (for romance languages)
_displaymode =
LCD_ENTRYLEFT
|
LCD_ENTRYSHIFTDECREMENT
;
//
set the entry mode
command
(
LCD_ENTRYMODESET
| _displaymode);
}
/*
********* high level commands, for the user!
*/
void
Max_LCD::clear
() {
command
(
LCD_CLEARDISPLAY
);
//
clear display, set cursor position to zero
delayMicroseconds
(
2000
);
//
this command takes a long time!
}
void
Max_LCD::home
() {
command
(
LCD_RETURNHOME
);
//
set cursor position to zero
delayMicroseconds
(
2000
);
//
this command takes a long time!
}
void
Max_LCD::setCursor
(
uint8_t
col,
uint8_t
row) {
int
row_offsets[] = {
0x00
,
0x40
,
0x14
,
0x54
};
if
(row > _numlines) {
row = _numlines -
1
;
//
we count rows starting w/0
}
command
(
LCD_SETDDRAMADDR
| (col + row_offsets[row]));
}
//
Turn the display on/off (quickly)
void
Max_LCD::noDisplay
() {
_displaycontrol &= ~
LCD_DISPLAYON
;
command
(
LCD_DISPLAYCONTROL
| _displaycontrol);
}
void
Max_LCD::display
() {
_displaycontrol |=
LCD_DISPLAYON
;
command
(
LCD_DISPLAYCONTROL
| _displaycontrol);
}
//
Turns the underline cursor on/off
void
Max_LCD::noCursor
() {
_displaycontrol &= ~
LCD_CURSORON
;
command
(
LCD_DISPLAYCONTROL
| _displaycontrol);
}
void
Max_LCD::cursor
() {
_displaycontrol |=
LCD_CURSORON
;
command
(
LCD_DISPLAYCONTROL
| _displaycontrol);
}
//
Turn on and off the blinking cursor
void
Max_LCD::noBlink
() {
_displaycontrol &= ~
LCD_BLINKON
;
command
(
LCD_DISPLAYCONTROL
| _displaycontrol);
}
void
Max_LCD::blink
() {
_displaycontrol |=
LCD_BLINKON
;
command
(
LCD_DISPLAYCONTROL
| _displaycontrol);
}
//
These commands scroll the display without changing the RAM
void
Max_LCD::scrollDisplayLeft
(
void
) {
command
(
LCD_CURSORSHIFT
|
LCD_DISPLAYMOVE
|
LCD_MOVELEFT
);
}
void
Max_LCD::scrollDisplayRight
(
void
) {
command
(
LCD_CURSORSHIFT
|
LCD_DISPLAYMOVE
|
LCD_MOVERIGHT
);
}
//
This is for text that flows Left to Right
void
Max_LCD::leftToRight
(
void
) {
_displaymode |=
LCD_ENTRYLEFT
;
command
(
LCD_ENTRYMODESET
| _displaymode);
}
//
This is for text that flows Right to Left
void
Max_LCD::rightToLeft
(
void
) {
_displaymode &= ~
LCD_ENTRYLEFT
;
command
(
LCD_ENTRYMODESET
| _displaymode);
}
//
This will 'right justify' text from the cursor
void
Max_LCD::autoscroll
(
void
) {
_displaymode |=
LCD_ENTRYSHIFTINCREMENT
;
command
(
LCD_ENTRYMODESET
| _displaymode);
}
//
This will 'left justify' text from the cursor
void
Max_LCD::noAutoscroll
(
void
) {
_displaymode &= ~
LCD_ENTRYSHIFTINCREMENT
;
command
(
LCD_ENTRYMODESET
| _displaymode);
}
//
Allows us to fill the first 8 CGRAM locations
//
with custom characters
void
Max_LCD::createChar
(
uint8_t
location,
uint8_t
charmap[]) {
location &=
0x7
;
//
we only have 8 locations 0-7
command
(
LCD_SETCGRAMADDR
| (location <<
3
));
for
(
int
i =
0
; i <
8
; i++) {
write
(charmap[i]);
}
}
/*
********** mid level commands, for sending data/cmds
*/
inline
void
Max_LCD::command
(
uint8_t
value) {
LCD_sendcmd
(value);
delayMicroseconds
(
100
);
}
#
if
defined(ARDUINO) && ARDUINO >=100
inline
size_t
Max_LCD::write
(
uint8_t
value) {
LCD_sendchar
(value);
return
1
;
//
Assume success
}
#
else
inline
void
Max_LCD::write
(
uint8_t
value) {
LCD_sendchar
(value);
}
#
endif
void
Max_LCD::sendbyte
(
uint8_t
val) {
lcdPins &=
0x0f
;
//
prepare place for the upper nibble
lcdPins |= (val &
0xf0
);
//
copy upper nibble to LCD variable
SET_E
;
//
send
SENDlcdPins
();
delayMicroseconds
(
2
);
CLR_E
;
delayMicroseconds
(
2
);
SENDlcdPins
();
lcdPins &=
0x0f
;
//
prepare place for the lower nibble
lcdPins |= (val <<
4
) &
0xf0
;
//
copy lower nibble to LCD variable
SET_E
;
//
send
SENDlcdPins
();
CLR_E
;
SENDlcdPins
();
delayMicroseconds
(
100
);
}
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