OLEDDisplay.h

00001 /* IoTKit OLED Display Library
00002  * Copyright (c) 2016 Marcel mc-b Bernet
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *     http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016  
00017 #include "mbed.h"
00018 #include <stdarg.h>
00019 #include "Adafruit_SSD1306.h"
00020 
00021 #ifndef OLED_DISPLAY
00022 #define OLED_DISPLAY
00023 
00024 /** OLED Display 
00025  *
00026  * Vereinfachte Version zur Ansteuerung eines Displays
00027  * auf Basis von I2C und SSD1306 Interface
00028  *
00029  * Example:
00030  * @code
00031  * #include "mbed.h"
00032  * #include "OLEDDisplay.h"
00033  * 
00034  * DigitalOut led( D10 );
00035  * OLEDDisplay oled;
00036  * 
00037  * int main()
00038  * {
00039  *     int i = 0;
00040  *     oled.clear();
00041  *     oled.printf( "Test\r\n" );
00042  *     
00043  *     while (true) 
00044  *     {
00045  *         oled.cursor( 1, 0 );
00046  *         oled.printf( "ON %d, %d\n", led.read(), i );
00047  *         led = 1;
00048  *         wait( 1.0f ); 
00049  *         
00050  *         oled.cursor( 2, 0 );
00051  *         oled.printf( "OFF %d, %d\n", led.read(), i );
00052  *         led = 0;
00053  *         i++;
00054  *         wait( 1.0f );
00055  *     }
00056  * }
00057  * @endcode
00058  */
00059 
00060 class OLEDDisplay
00061 {
00062 public:
00063     OLEDDisplay( PinName rst = D9, PinName sca = D14, PinName scl = D15, uint8_t addr = 0x78 ) : i2c( sca, scl ), oled( i2c, rst, addr )
00064     {
00065     }
00066     
00067     /** clear Display */
00068     void clear()
00069     {
00070         oled.clearDisplay();
00071         oled.setTextCursor( 0, 0 );                
00072     }
00073     /** Set the display rotation, 1 = down, 2 = up, 3 = left, or 4 = right*/
00074     void setRotation(uint8_t r)
00075     {
00076         oled.setRotation( r );
00077     }
00078     
00079     /** printf formatted with display */
00080     void printf( const char *format, ... )
00081     {
00082         static char buffer[128];
00083         
00084         va_list args;
00085         va_start(args, format);
00086         vsprintf(buffer, format, args);
00087         va_end(args);
00088         
00089         oled.printf( buffer );
00090         oled.display();
00091     }
00092 
00093     /// Set the text cursor location, based on the size of the text
00094     void cursor( int16_t y, int16_t x ) 
00095     { 
00096         oled.setTextCursor( x * 6 , y * 8 ); 
00097     }
00098 
00099     
00100 private:
00101         I2C i2c;
00102         Adafruit_SSD1306_I2c oled;
00103 };
00104 
00105 #endif // OLED_DISPLAY