Michel2/New-LiquidCrystal
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Adding backlight support to base classes.

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This commit is contained in:
FMC
2012-02-18 13:25:57 +01:00
parent a047995b23
commit 58bfb8a2ed
2 changed files with 47 additions and 63 deletions
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LiquidCrystal_I2C.cpp
+34 -28
View File
@@ -39,13 +39,20 @@
#include "LiquidCrystal_I2C.h"
// flags for backlight control
#define LCD_NOBACKLIGHT 0x00
#define LCD_BACKLIGHT 0xFF
// CONSTRUCTORS
// ---------------------------------------------------------------------------
LiquidCrystal_I2C::LiquidCrystal_I2C( uint8_t lcd_Addr )
{
_Addr = lcd_Addr;
_backlightval = LCD_NOBACKLIGHT;
_backlightPin = 0x0;
_backlightMask = LCD_NOBACKLIGHT;
_En = EN;
_Rw = RW;
_Rs = RS;
@@ -58,11 +65,13 @@ LiquidCrystal_I2C::LiquidCrystal_I2C( uint8_t lcd_Addr )
}
LiquidCrystal_I2C::LiquidCrystal_I2C( uint8_t lcd_Addr, uint8_t En, uint8_t Rw,
uint8_t Rs)
uint8_t Rs)
{
_Addr = lcd_Addr;
_backlightval = LCD_NOBACKLIGHT;
_backlightPin = 0;
_backlightMask = LCD_NOBACKLIGHT;
_En = ( 1 << En );
_Rw = ( 1 << Rw );
_Rs = ( 1 << Rs );
@@ -80,7 +89,9 @@ LiquidCrystal_I2C::LiquidCrystal_I2C( uint8_t lcd_Addr, uint8_t En, uint8_t Rw,
{
_Addr = lcd_Addr;
_backlightval = LCD_NOBACKLIGHT;
_backlightPin = 0;
_backlightMask = LCD_NOBACKLIGHT;
_En = ( 1 << En );
_Rw = ( 1 << Rw );
_Rs = ( 1 << Rs );
@@ -109,6 +120,7 @@ int LiquidCrystal_I2C::init()
_i2cio.portMode ( OUTPUT ); // Set the entire IO extender to OUTPUT
_displayfunction = LCD_4BITMODE | LCD_1LINE | LCD_5x8DOTS;
status = 1;
_i2cio.write(0); // Set the entire port to LOW
}
return ( status );
}
@@ -131,16 +143,20 @@ void LiquidCrystal_I2C::begin(uint8_t cols, uint8_t lines, uint8_t dotsize)
//----------------------------------------------------------------------------
// Turn the (optional) backlight off/on
void LiquidCrystal_I2C::noBacklight(void)
void LiquidCrystal_I2C::setBacklight( uint8_t mode )
{
_backlightval=LCD_NOBACKLIGHT;
expanderWrite(0);
}
void LiquidCrystal_I2C::backlight(void)
{
_backlightval=LCD_BACKLIGHT;
expanderWrite(0);
if ( mode == HIGH )
{
_backlightMask = _backlightPin & LCD_BACKLIGHT;
}
else
{
_backlightMask = _backlightPin & LCD_NOBACKLIGHT;
}
_i2cio.write( _backlightMask );
}
// PRIVATE METHODS
@@ -184,25 +200,15 @@ void LiquidCrystal_I2C::write4bits ( uint8_t value, uint8_t mode )
mode = _Rs;
}
expanderWrite ( pinMapValue | mode );
pulseEnable ( pinMapValue | mode );
pinMapValue |= mode | _backlightMask;
_i2cio.write ( pinMapValue );
pulseEnable ( pinMapValue );
}
//
// write4bits
void LiquidCrystal_I2C::pulseEnable (uint8_t _data)
{
expanderWrite (_data | _En); // En HIGH
expanderWrite(_data & ~_En); // En LOW
}
//
// expanderWrite
void LiquidCrystal_I2C::expanderWrite(uint8_t _data)
{
_i2cio.write ( _data );
}
_i2cio.write (_data | _En); // En HIGH
_i2cio.write (_data & ~_En); // En LOW
}
LiquidCrystal_I2C.h
+13 -35
View File
@@ -37,15 +37,9 @@
#include "I2CIO.h"
#include "LCD.h"
// flags for backlight control
#define LCD_BACKLIGHT 0x00
#define LCD_NOBACKLIGHT 0x80
/*!
@warning These definitions will have to be changed should the IOExpander be
connected differently to this default.
*/
// Default library configuration parameters used by class constructor with
// only the I2C address field.
// ---------------------------------------------------------------------------
/*!
@defined
@abstract Enable bit of the LCD
@@ -155,19 +149,9 @@ public:
@discussion Switch-off the LCD backlight, this method is not supported by
the I2CLCDextraIO, it needs an extra IO pin to drive the LCD backlight
@param none
@param mode: backlight mode (HIGH|LOW)
*/
void noBacklight();
/*!
@function
@abstract Switch-on the LCD backlight.
@discussion Switch-on the LCD backlight, this method is not supported by
the I2CLCDextraIO, it needs an extra IO pin to drive the LCD backlight
@param none
*/
void backlight();
void setBacklight ( uint8_t mode );
private:
@@ -197,21 +181,15 @@ private:
*/
void pulseEnable(uint8_t);
/*!
@method
@abstract Writes to the expansion module.
@discussion Writes a byte to the IO expansion module. This will be applied
to all its outputs.
*/
void expanderWrite(uint8_t);
uint8_t _Addr; // I2C Address of the IO expander
uint8_t _backlightval; // Backlight shadow value
I2CIO _i2cio; // I2CIO PCF8574* expansion module driver I2CLCDextraIO
uint8_t _En; // LCD expander word for enable pin
uint8_t _Rw; // LCD expander word for R/W pin
uint8_t _Rs; // LCD expander word for Register Select pin
uint8_t _data_pins[4]; // LCD data lines
uint8_t _Addr; // I2C Address of the IO expander
uint8_t _backlightPin; // Backlight IO pin
uint8_t _backlightMask; // Backlight status mask
I2CIO _i2cio; // I2CIO PCF8574* expansion module driver I2CLCDextraIO
uint8_t _En; // LCD expander word for enable pin
uint8_t _Rw; // LCD expander word for R/W pin
uint8_t _Rs; // LCD expander word for Register Select pin
uint8_t _data_pins[4]; // LCD data lines
};