Diff: st7735.cpp

Revision:

9:58b328831d0a

Child:

10:69571adcfad5

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/st7735.cpp	Fri Dec 07 16:14:13 2012 +0000
@@ -0,0 +1,228 @@
+/*
+ * Copyright (C)2010-2012 Henning Karlsen. All right reserved.
+ * Copyright (C)2012 Todor Todorov.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to:
+ *
+ * Free Software Foundation, Inc.
+ * 51 Franklin St, 5th Floor, Boston, MA 02110-1301, USA
+ *
+ *********************************************************************/
+#include "st7735.h"
+#include "helpers.h"
+
+ST7735_LCD::ST7735_LCD( PinName CS, PinName RESET, PinName RS, PinName SCL, PinName SDA, PinName BL )
+    : LCD( 128, 160, CS, RS, RESET ), _lcd_pin_scl( SCL ), _lcd_pin_sda( SDA )
+{
+    if ( BL != NC ) _lcd_pin_bl = new DigitalOut( BL );
+    else _lcd_pin_bl = 0;
+}
+
+void ST7735_LCD::Initialize( orientation_t orientation )
+{
+    _orientation = orientation;
+    
+    wait_ms( 100 );
+    _lcd_pin_reset = HIGH;
+    wait_ms( 5 );
+    _lcd_pin_reset = LOW;
+    wait_ms( 15 );
+    _lcd_pin_reset = HIGH;
+    _lcd_pin_cs = HIGH;
+    _lcd_pin_rs = HIGH;
+    _lcd_pin_scl = HIGH;
+    _lcd_pin_sda = HIGH;
+    if ( _lcd_pin_bl != 0 )
+        *_lcd_pin_bl = HIGH;
+    wait_ms( 55 );
+    
+    Activate();
+    WriteCmd( 0x01 ); // SW reset
+    wait_ms( 120 );
+    
+    WriteCmd( 0x11 ); // sleep out
+    wait_ms( 120 );
+    
+    WriteCmd( 0xB1 ); // frame control 1
+    WriteByteData( 0x01 );
+    WriteByteData( 0x2C );
+    WriteByteData( 0x2D );
+    WriteCmd( 0xB2 ); // frame control 2
+    WriteByteData( 0x01 );
+    WriteByteData( 0x2C );
+    WriteByteData( 0x2D );
+    WriteCmd( 0xB3 ); // frame control 3
+    WriteByteData( 0x01 );
+    WriteByteData( 0x2C );
+    WriteByteData( 0x2D );
+    WriteByteData( 0x01 );
+    WriteByteData( 0x2C );
+    WriteByteData( 0x2D );
+    
+    WriteCmd( 0xB4 ); // column inversion
+    WriteByteData( 0x07 );
+
+    // ST7735R Power Sequence
+    WriteCmd( 0xC0 ); // power control 1
+    WriteByteData( 0xA2 );
+    WriteByteData( 0x02 );
+    WriteByteData( 0x84 );
+    WriteCmd( 0xC1 ); // power control 2
+    WriteByteData( 0xC5 );
+    WriteCmd( 0xC2 ); // power control 3
+    WriteByteData( 0x0A );
+    WriteByteData( 0x00 );
+    WriteCmd( 0xC3 ); // power control 4
+    WriteByteData( 0x8A );
+    WriteByteData( 0x2A );
+    WriteCmd( 0xC4 ); // power control 5
+    WriteByteData( 0x8A );
+    WriteByteData( 0xEE );
+    
+    WriteCmd( 0xC5 ); // voltage control 1
+    WriteByteData( 0x0E );
+
+    WriteCmd( 0x36 ); //MX, MY, RGB mode
+    WriteByteData( 0xC8 );
+
+    // ST7735R Gamma Sequence
+    WriteCmd( 0xE0 ); // gamma positive
+    WriteByteData( 0x0F );
+    WriteByteData( 0x1A );
+    WriteByteData( 0x0F );
+    WriteByteData( 0x18 );
+    WriteByteData( 0x2F );
+    WriteByteData( 0x28 );
+    WriteByteData( 0x20 );
+    WriteByteData( 0x22 );
+    WriteByteData( 0x1F );
+    WriteByteData( 0x1B );
+    WriteByteData( 0x23 );
+    WriteByteData( 0x37 );
+    WriteByteData( 0x00 );
+    WriteByteData( 0x07 );
+    WriteByteData( 0x02 );
+    WriteByteData( 0x10 );
+    WriteCmd( 0xE1 ); // gamma negative
+    WriteByteData( 0x0F );
+    WriteByteData( 0x1B );
+    WriteByteData( 0x0F );
+    WriteByteData( 0x17 );
+    WriteByteData( 0x33 );
+    WriteByteData( 0x2C );
+    WriteByteData( 0x29 );
+    WriteByteData( 0x2E );
+    WriteByteData( 0x30 );
+    WriteByteData( 0x30 );
+    WriteByteData( 0x39 );
+    WriteByteData( 0x3F );
+    WriteByteData( 0x00 );
+    WriteByteData( 0x07 );
+    WriteByteData( 0x03 );
+    WriteByteData( 0x10 );
+
+    WriteCmd( 0x2A ); // set column address
+    WriteByteData( 0x00 );
+    WriteByteData( 0x00 );
+    WriteByteData( 0x00 );
+    WriteByteData( 0x7F );
+    WriteCmd( 0x2B ); // set row address
+    WriteByteData( 0x00 );
+    WriteByteData( 0x00 );
+    WriteByteData( 0x00 );
+    WriteByteData( 0x9F );
+
+    WriteCmd( 0xF0 ); // enable extensions command
+    WriteByteData( 0x01 );
+    WriteCmd( 0xF6 ); // disable ram power save mode
+    WriteByteData( 0x00 );
+
+    WriteCmd( 0x3A ); // interface pixel format (color mode)
+    WriteByteData( 0x05 ); // 65k mode
+    WriteCmd( 0x29 ); // display on
+
+    Deactivate();
+}
+
+void ST7735_LCD::Sleep( void )
+{
+    Activate();
+    WriteCmd( 0x28 );
+    wait_ms( 10 );
+    WriteCmd( 0x10 );
+    wait_ms( 125 );
+    if ( _lcd_pin_bl != 0 )
+        *_lcd_pin_bl = LOW;
+    Deactivate();
+}
+
+void ST7735_LCD::WakeUp( void )
+{
+    Activate();
+    WriteCmd( 0x29 );
+    wait_ms( 10 );
+    WriteCmd( 0x11 );
+    wait_ms( 125 );
+    if ( _lcd_pin_bl != 0 )
+        *_lcd_pin_bl = HIGH;
+    Deactivate();
+}
+
+void ST7735_LCD::WriteCmd( unsigned short cmd )
+{
+    _lcd_pin_rs = LOW;
+    serializeByte( cmd & 0xFF );
+}
+
+void ST7735_LCD::WriteData( unsigned short data )
+{
+    _lcd_pin_rs = HIGH;
+    serializeByte( ( data >> 8 ) & 0xFF );
+    serializeByte( data & 0xFF );
+}
+
+void ST7735_LCD::WriteByteData( unsigned char data )
+{
+    _lcd_pin_rs = HIGH;
+    serializeByte( data );
+}
+
+void ST7735_LCD::SetXY( uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2 )
+{
+    if ( _orientation == LANDSCAPE )
+    {
+        swap( uint16_t, x1, y1 )
+        swap( uint16_t, x2, y2 )
+        y1 = _disp_height - y1;
+        y2 = _disp_height - y2;
+        swap( uint16_t, y1, y2 )
+    }
+
+    WriteCmdData( 0x2a, x1 );
+    WriteData( x2 );
+    WriteCmdData( 0x2b, y1 );
+    WriteData( y2 );
+    WriteCmd( 0x2c );
+}
+
+void ST7735_LCD::serializeByte( unsigned char data )
+{
+    for ( int i = 0; i < 8; i++ )
+    {
+        if ( data & 0x80 ) _lcd_pin_sda = HIGH;
+        else _lcd_pin_sda = LOW;
+        pulseLow( _lcd_pin_scl );
+        data = data << 1;
+    }
+}