Arduino style GUI
Drivers/SSD1306_I2C.cpp
- Committer:
- jonebuckman
- Date:
- 2016-05-06
- Revision:
- 0:90962b684403
File content as of revision 0:90962b684403:
/* 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_I2C.h" SSD1306_I2C::SSD1306_I2C(PinName sda, PinName scl, Address addr) : Display(128, 64), m_I2C(sda, scl), m_ADDR((int)addr) { //Set the I2C frequency to 400kHz m_I2C.frequency(400000); } bool SSD1306_I2C::open() { //Probe for the SSD1306 using a Zero Length Transfer if (!m_I2C.write(m_ADDR, NULL, 0)) { //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; } else { //Return failure return false; } } void SSD1306_I2C::flush() { //Select low col 0, hi col 0, line 0 writeCommand(CMD_SETLOWCOLUMN | 0x0); writeCommand(CMD_SETHIGHCOLUMN | 0x0); writeCommand(CMD_SETSTARTLINE | 0x0); //Make sure the first byte in the buffer is the control byte m_Buffer[0] = CONTROL_DATA; //Write the buffer m_I2C.write(m_ADDR, m_Buffer, 1025); } Display::State SSD1306_I2C::state() { //Return the base class's state return Display::state(); } void SSD1306_I2C::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_I2C::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(); //HACK: Fix the whole 1025 byte i2c buffer thing byteIndex++; //Set or clear the pixel if ((c & 0x00FFFFFF) > 0) m_Buffer[byteIndex] |= (1 << (y % 8)); else m_Buffer[byteIndex] &= ~(1 << (y % 8)); } void SSD1306_I2C::writeCommand(char command) { //Create a temporary buffer char buff[2]; //Load the control byte and 8-bit command buff[0] = CONTROL_COMMAND; buff[1] = command; //Write the command m_I2C.write(m_ADDR, buff, 2); } void SSD1306_I2C::writeData(char data) { //Create a temporary buffer char buff[2]; //Load the control byte and 8-bit data buff[0] = CONTROL_DATA; buff[1] = data; //Write the data m_I2C.write(m_ADDR, buff, 2); }