Diff: lcd_base.cpp

Revision:

22:4c169297f374

Parent:

21:e5c1e8ffada1

--- a/lcd_base.cpp	Sat Jan 26 02:55:46 2013 +0000
+++ b/lcd_base.cpp	Sat Jan 26 04:36:46 2013 +0000
@@ -22,12 +22,54 @@
 #include "lcd_base.h"
 #include "helpers.h"
 
-LCD::LCD( unsigned short width, unsigned short height ,PinName CS, PinName RS, PinName RESET )
-    : _disp_width( width ), _disp_height( height ), _lcd_pin_cs( CS ), _lcd_pin_rs( RS ), _lcd_pin_reset( RESET )
+LCD::LCD( unsigned short width, unsigned short height ,PinName CS, PinName RS, PinName RESET, PinName BL, backlight_t blType, float defaultBacklight )
+    : _disp_width( width ), _disp_height( height ), _lcd_pin_cs( CS ), _lcd_pin_rs( RS ), _lcd_pin_reset( RESET ), _bl_type( blType )
 {
     SetForeground();
     SetBackground();
     _font = &TerminusFont;
+    if ( defaultBacklight < 0 ) _bl_pwm_default = 0;
+    else if ( defaultBacklight > 1.0 ) _bl_pwm_default = 1.0;
+    else _bl_pwm_default = defaultBacklight;
+    if ( BL != NC )
+    {
+        if ( blType == Constant )
+        {
+            _bl_pwm = 0;
+            _lcd_pin_bl = new DigitalOut( BL );
+        }
+        else
+        {
+            _lcd_pin_bl = 0;
+            _bl_pwm = new PwmOut( BL );
+            _bl_pwm->period_ms( 8.33 ); // 120 Hz
+            _bl_pwm_current = _bl_pwm_default;
+            // initially off
+            *_bl_pwm = 0;
+        }
+        
+    }
+    else
+    {
+        _lcd_pin_bl = 0;
+        _bl_pwm = 0;
+    }
+}
+
+void LCD::Sleep( void )
+{
+    if ( _lcd_pin_bl != 0 )
+        *_lcd_pin_bl = LOW;
+    else if ( _bl_pwm != 0 )
+        *_bl_pwm = 0;
+}
+
+void LCD::WakeUp( void )
+{
+    if ( _lcd_pin_bl != 0 )
+        *_lcd_pin_bl = HIGH;
+    else if ( _bl_pwm != 0 )
+        *_bl_pwm = _bl_pwm_current;
 }
 
 inline
@@ -75,6 +117,26 @@
     return 0;
 }
 
+void LCD::SetBacklightLevel( float level )
+{
+    switch ( _bl_type )
+    {
+        case Direct:
+            if ( _bl_pwm != 0 )
+            {
+                *_bl_pwm = level;
+                _bl_pwm_current = level;
+            }
+            break;
+            
+        case Indirect:
+            break;
+        case Constant:
+        default:
+            break;
+    }
+}
+
 void LCD::FillScreen( int color )
 {
     unsigned int rgb = color == -1 ? _background : color == -2 ? _foreground : ( unsigned int ) color;