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.
Dependents: test SDCard capstone_display capstone_display_2 ... more
st7735.h
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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