Arduino style GUI
Diff: Drivers/SSD1306_SPI.cpp
- Revision:
- 0:90962b684403
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Drivers/SSD1306_SPI.cpp Fri May 06 16:51:15 2016 +0000 @@ -0,0 +1,147 @@ +/* NeatGUI Library + * Copyright (c) 2013 Neil Thiessen + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include "SSD1306_SPI.h" + +SSD1306_SPI::SSD1306_SPI(PinName mosi, PinName miso, PinName sclk, PinName cs, PinName dc) : Display(128, 64), m_SPI(mosi, miso, sclk), m_CS(cs), m_DC(dc) +{ + //Deselect the display + m_CS = 1; + + //Set the SPI format to 8 bit data, high steady state clock, second edge capture + m_SPI.format(8, 3); + + //Set the SPI frequency to 10MHz + m_SPI.frequency(10000000); +} + +bool SSD1306_SPI::open() +{ + //Init sequence for 128x64 OLED module + writeCommand(CMD_DISPLAYOFF); + writeCommand(CMD_SETDISPLAYCLOCKDIV); + writeCommand(0x80); + writeCommand(CMD_SETMULTIPLEX); + writeCommand(0x3F); + writeCommand(CMD_SETDISPLAYOFFSET); + writeCommand(0x0); + writeCommand(CMD_SETSTARTLINE | 0x0); + writeCommand(CMD_CHARGEPUMP); + writeCommand(CMD_CHARGEPUMPON); + writeCommand(CMD_MEMORYMODE); + writeCommand(0x00); + writeCommand(CMD_SEGREMAP | 0x1); + writeCommand(CMD_COMSCANDEC); + writeCommand(CMD_SETCOMPINS); + writeCommand(0x12); + writeCommand(CMD_SETCONTRAST); + writeCommand(0xCF); + writeCommand(CMD_SETPRECHARGE); + writeCommand(0xF1); + writeCommand(CMD_SETVCOMDETECT); + writeCommand(0x40); + writeCommand(CMD_DISPLAYALLON_RESUME); + writeCommand(CMD_NORMALDISPLAY); + + //Return success + return true; +} + +void SSD1306_SPI::flush() +{ + //Select low col 0, hi col 0, line 0 + writeCommand(CMD_SETLOWCOLUMN | 0x0); + writeCommand(CMD_SETHIGHCOLUMN | 0x0); + writeCommand(CMD_SETSTARTLINE | 0x0); + + //Set DC to data and select the chip + m_DC = 1; + m_CS = 0; + + //Write the entire buffer at once + for (int i = 0; i < 1024; i++) + m_SPI.write(m_Buffer[i]); + + //Deselect the chip + m_CS = 1; +} + +Display::State SSD1306_SPI::state() +{ + //Return the base class's state + return Display::state(); +} + +void SSD1306_SPI::state(State s) +{ + //Check what the requested state is + if (s == Display::DISPLAY_ON) { + //Turn the display on + writeCommand(CMD_DISPLAYON); + } else if (s == Display::DISPLAY_OFF) { + //Turn the display off + writeCommand(CMD_DISPLAYOFF); + } + + //Update the base class + Display::state(s); +} + +void SSD1306_SPI::drawPixel(int x, int y, unsigned int c) +{ + //Range check the pixel + if ((x < 0) || (x >= width()) || (y < 0) || (y >= height())) + return; + + //Make sure the color is fully opaque + if ((c >> 24) != 255) + return; + + //Determine the pixel byte index + unsigned short byteIndex = x + (y / 8) * width(); + + //Set or clear the pixel + if ((c & 0x00FFFFFF) > 0) + m_Buffer[byteIndex] |= (1 << (y % 8)); + else + m_Buffer[byteIndex] &= ~(1 << (y % 8)); +} + +void SSD1306_SPI::writeCommand(char command) +{ + //Set DC to command and select the display + m_DC = 0; + m_CS = 0; + + //Write the command byte + m_SPI.write(command); + + //Deselect the display + m_CS = 1; +} + +void SSD1306_SPI::writeData(char data) +{ + //Set DC to data and select the display + m_DC = 1; + m_CS = 0; + + //Write the data byte + m_SPI.write(data); + + //Deselect the display + m_CS = 1; +}