Thiha Electronics / TFTLCD_8bit

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. This fork is for 8 bit interface. I will add proper switch in later commit

Dependents:   KL25Z_ILI9325

Fork of TFTLCD by Todor Todorov

st7735.cpp

Committer:
ttodorov
Date:
2012-12-11
Revision:
14:8efbe7361dae
Parent:
12:d0978272a340
Child:
15:af3cd35886fb

File content as of revision 14:8efbe7361dae:

/*
 * 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, colordepth_t colors )
{
    _orientation = orientation;
    _colorDepth = colors;
    
    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 );
    WriteByteData( 0x00 );

    // 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 );

    // 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): 0x05 => RGB16, 0x06 => RGB18
    WriteByteData( _colorDepth == RGB16 ? 0x05 : 0x06 );

    WriteCmd( 0x36 ); //MX, MY, RGB mode
    switch ( _orientation )
    {
        case LANDSCAPE: WriteByteData( 0xB8 ); break;
        case PORTRAIT_REV: WriteByteData( 0xDC ); break;
        case LANDSCAPE_REV: WriteByteData( 0x6C ); break;
        case PORTRAIT:
        default: WriteByteData( 0x08 ); break;
    }
    
    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 )
{
    WriteCmdData( 0x2a, x1 );
    WriteData( x2 );
    WriteCmdData( 0x2b, y1 );
    WriteData( y2 );
    WriteCmd( 0x2c );
}

void ST7735_LCD::SetPixelColor( unsigned int color )
{
    unsigned char r, g, b;
    r = ( color >> 16 ) & 0xFF;
    g = ( color >> 8 ) & 0xFF;
    b = color & 0xFF;
    if ( _colorDepth == RGB16 )
    {
        unsigned short clr = ( ( ( ( r ) & 0xF8 ) | ( ( g ) >> 5 ) ) << 8 ) | ( ( ( ( g ) & 0x1C ) << 3 ) | ( ( b ) >> 3 ) );
        WriteData( clr );
    }
    else
    {
        WriteByteData( r & 0xFC );
        WriteByteData( g & 0xFC );
        WriteByteData( b & 0xFC );
    }
}

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;
    }
}