Steffen Arntz
This is a port of Henning Kralsen's UTFT library for Arduino/chipKIT to mbed, refactored to make full use of C inheritance and access control, in order to reduce work when implementing new drivers and at the same time make the code more readable and easier to maintain. As of now supported are SSD1289 (16-bit interface), HX8340-B (serial interface) and ST7735 (serial interface). Drivers for other controllers will be added as time and resources to acquire the displays to test the code permit.
Fork of
TFTLCD
by 
Todor Todorov
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;
+ }
+}