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st7735.h
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00001 /** \file st7735.h 00002 * \brief mbed TFT LCD controller for displays with the ST7735 IC. 00003 * \copyright GNU Public License, v2. or later 00004 * 00005 * A known display with this type of controller chip is the ITDB02-1.8SP 00006 * from http://imall.iteadstudio.com 00007 * 00008 * This library is based on the Arduino/chipKIT UTFT library by Henning 00009 * Karlsen, http://henningkarlsen.com/electronics/library.php?id=52 00010 * 00011 * Copyright (C)2010-2012 Henning Karlsen. All right reserved. 00012 * 00013 * Copyright (C)2012 Todor Todorov. 00014 * 00015 * This library is free software; you can redistribute it and/or 00016 * modify it under the terms of the GNU Lesser General Public 00017 * License as published by the Free Software Foundation; either 00018 * version 2.1 of the License, or (at your option) any later version. 00019 * 00020 * This library is distributed in the hope that it will be useful, 00021 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00022 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00023 * Lesser General Public License for more details. 00024 * 00025 * You should have received a copy of the GNU Lesser General Public 00026 * License along with this library; if not, write to: 00027 * 00028 * Free Software Foundation, Inc. 00029 * 51 Franklin St, 5th Floor, Boston, MA 02110-1301, USA 00030 * 00031 *********************************************************************/ 00032 #ifndef TFTLCD_ST7735_H 00033 #define TFTLCD_ST7735_H 00034 00035 #include "lcd_base.h" 00036 00037 #ifdef __cplusplus 00038 extern "C" { 00039 #endif 00040 00041 /** Represents a LCD instance. 00042 * 00043 * This is the utility class, through which the display can be manipulated 00044 * and graphics objects can be shown to the user. A known display, which 00045 * works with this library is the ITDB02-1.8SP from iTeadStudio - a RGB TFT 00046 * with 128x160 pixels resolution and 262K colors, using serail interface. 00047 * 00048 * The display needs 5 or 6 pins to work with mbed, uses +3.3V for backlight, 00049 * power and logic, thus can be interfaced directly to the mbed kit without 00050 * the need of shields or level shifters as with Arduino. 00051 * 00052 * How to use: 00053 * \code 00054 * // include the library, this will also pull in the header for the provided fonts 00055 * #include "st7735.h" 00056 * 00057 * // create the lcd instance 00058 * ST7735_LCD lcd( p14, p13, p12, p11, p10 ); // control pins 00059 * 00060 * int main() 00061 * { 00062 * // initialize display - place it in standard portrait mode and set background to black and 00063 * // foreground to white color. 00064 * lcd.Initialize(); 00065 * // set current font to the smallest 8x12 pixels font. 00066 * lcd.SetFont( Font8x12 ); 00067 * // print something on the screen 00068 * lcd.Print( "Hello, World!", CENTER, 25 ); // align text to center horizontally and use starndard colors 00069 * 00070 * while ( 1 ) { } 00071 * } 00072 * 00073 * \endcode 00074 * \version 0.1 00075 * \author Todor Todorov 00076 */ 00077 class ST7735_LCD : public LCD 00078 { 00079 public: 00080 /** Creates a new instance of the class. 00081 * 00082 * \param CS Pin for the ChipSelect signal. 00083 * \param RESET Pin for the RESET line. 00084 * \param RS Pin for the RS signal. 00085 * \param SCL Pin for the serial clock line. 00086 * \param SDA Pin for the serial data line. 00087 * \param BL Pin for controlling the backlight. By default not used. 00088 * \param blType The backlight type, the default is to utilize the pin - if supplied - as a simple on/off switch 00089 * \param defaultBacklightLevel If using PWM to control backlight, this would be the default brightness in percent after LCD initialization. 00090 */ 00091 ST7735_LCD( PinName CS, PinName RESET, PinName RS, PinName SCL, PinName SDA, PinName BL = NC, backlight_t blType = Constant, float defaultBackLightLevel = 1.0 ); 00092 00093 /** Initialize display. 00094 * 00095 * Wakes up the display from sleep, initializes power parameters. 00096 * This function must be called first, befor any painting on the 00097 * display is done, otherwise the positioning of graphical elements 00098 * will not work properly and any paynt operation will not be visible 00099 * or produce garbage. 00100 * 00101 * \param oritentation The display orientation, landscape is default. 00102 * \param colors The correct color depth to use for the pixel data. 00103 */ 00104 virtual void Initialize( orientation_t orientation = LANDSCAPE, colordepth_t colors = RGB16 ); 00105 00106 /** Puts the display to sleep. 00107 * 00108 * When the display is in sleep mode, its power consumption is 00109 * minimized. Before new pixel data can be written to the display 00110 * memory, the controller needs to be brought out of sleep mode. 00111 * \sa #WakeUp( void ); 00112 * \remarks The result of this operation might not be exactly as 00113 * expected. Putting the display to sleep will cause the 00114 * controller to switch to the standard color of the LCD, 00115 * so depending on whether the display is normally white, 00116 * or normally dark, the screen might or might not go 00117 * dark. Additional power saving can be achieved, if 00118 * the backlight of the used display is not hardwired on 00119 * the PCB and can be controlled via the BL pin. 00120 */ 00121 virtual void Sleep( void ); 00122 00123 /** Wakes up the display from sleep mode. 00124 * 00125 * This function needs to be called before any other, when the 00126 * display has been put into sleep mode by a previois call to 00127 * #Sleep( void ). 00128 */ 00129 virtual void WakeUp( void ); 00130 00131 protected: 00132 /** Sends a command to the display. 00133 * 00134 * \param cmd The display command. 00135 * \remarks Commands are controller-specific and this function needs to 00136 * be implemented separately for each available controller. 00137 */ 00138 virtual void WriteCmd( unsigned short cmd ); 00139 00140 /** Sends pixel data to the display. 00141 * 00142 * \param data The display data. 00143 * \remarks Sendin data is controller-specific and this function needs to 00144 * be implemented separately for each available controller. 00145 */ 00146 virtual void WriteData( unsigned short data ); 00147 00148 /** Writes a single byte of pixel data to the display. 00149 * 00150 * \param data The data to be written. 00151 * \remarks Sendin data is controller-specific and this function needs to 00152 * be implemented separately for each available controller. 00153 */ 00154 virtual void WriteByteData( unsigned char data ); 00155 00156 /** Assigns a chunk of the display memory to receive data. 00157 * 00158 * When data is sent to the display after this function completes, the opertion will 00159 * start from the begining of the assigned address (pixel position) and the pointer 00160 * will be automatically incremented so that the next data write operation will continue 00161 * with the next pixel from the memory block. If more data is written than available 00162 * pixels, at the end of the block the pointer will jump back to its beginning and 00163 * commence again, until the next address change command is sent to the display. 00164 * 00165 * \param x1 The X coordinate of the pixel at the beginning of the block. 00166 * \param y1 The Y coordinate of the pixel at the beginning of the block. 00167 * \param x2 The X coordinate of the pixel at the end of the block. 00168 * \param y2 The Y coordinate of the pixel at the end of the block. 00169 * \remarks Addressing commands are controller-specific and this function needs to be 00170 * implemented separately for each available controller. 00171 */ 00172 virtual void SetXY( unsigned short x1, unsigned short y1, unsigned short x2, unsigned short y2 ); 00173 00174 /** Sets the color of the pixel at the address pointer of the controller. 00175 * 00176 * This function is to be provided by each implementation separately in 00177 * order to account for different color depth used by the controller. 00178 * \param color The color of the pixel. 00179 * \param mode The depth (palette) of the color. 00180 */ 00181 virtual void SetPixelColor( unsigned int color, colordepth_t mode = RGB24 ); 00182 00183 private: 00184 void serializeByte( unsigned char data ); 00185 00186 private: 00187 DigitalOut _lcd_pin_scl, _lcd_pin_sda; 00188 DigitalOut* _lcd_pin_bl; 00189 }; 00190 00191 #ifdef __cplusplus 00192 } 00193 #endif 00194 00195 #endif /* TFTLCD_ST7735_H */
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