Jon Buckman / NeatGUIs

Arduino style GUI

Drivers/SSD1306_I2C.cpp@4:d353b314d244, 2019-02-27 (annotated)

Committer:
jonebuckman
Date:
Wed Feb 27 22:34:06 2019 +0000
Revision:
4:d353b314d244
Parent:
0:90962b684403 
Updated writeCommand and writeData.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jonebuckman 0:90962b684403 1 /* NeatGUI Library
jonebuckman 0:90962b684403 2 * Copyright (c) 2013 Neil Thiessen
jonebuckman 0:90962b684403 3 *
jonebuckman 0:90962b684403 4 * Licensed under the Apache License, Version 2.0 (the "License");
jonebuckman 0:90962b684403 5 * you may not use this file except in compliance with the License.
jonebuckman 0:90962b684403 6 * You may obtain a copy of the License at
jonebuckman 0:90962b684403 7 *
jonebuckman 0:90962b684403 8 * http://www.apache.org/licenses/LICENSE-2.0
jonebuckman 0:90962b684403 9 *
jonebuckman 0:90962b684403 10 * Unless required by applicable law or agreed to in writing, software
jonebuckman 0:90962b684403 11 * distributed under the License is distributed on an "AS IS" BASIS,
jonebuckman 0:90962b684403 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
jonebuckman 0:90962b684403 13 * See the License for the specific language governing permissions and
jonebuckman 0:90962b684403 14 * limitations under the License.
jonebuckman 0:90962b684403 15 */
jonebuckman 0:90962b684403 16
jonebuckman 0:90962b684403 17 #include "SSD1306_I2C.h"
jonebuckman 0:90962b684403 18
jonebuckman 0:90962b684403 19 SSD1306_I2C::SSD1306_I2C(PinName sda, PinName scl, Address addr) : Display(128, 64), m_I2C(sda, scl), m_ADDR((int)addr)
jonebuckman 0:90962b684403 20 {
jonebuckman 0:90962b684403 21 //Set the I2C frequency to 400kHz
jonebuckman 0:90962b684403 22 m_I2C.frequency(400000);
jonebuckman 0:90962b684403 23 }
jonebuckman 0:90962b684403 24
jonebuckman 0:90962b684403 25 bool SSD1306_I2C::open()
jonebuckman 0:90962b684403 26 {
jonebuckman 0:90962b684403 27 //Probe for the SSD1306 using a Zero Length Transfer
jonebuckman 0:90962b684403 28 if (!m_I2C.write(m_ADDR, NULL, 0)) {
jonebuckman 0:90962b684403 29 //Init sequence for 128x64 OLED module
jonebuckman 0:90962b684403 30 writeCommand(CMD_DISPLAYOFF);
jonebuckman 0:90962b684403 31 writeCommand(CMD_SETDISPLAYCLOCKDIV);
jonebuckman 0:90962b684403 32 writeCommand(0x80);
jonebuckman 0:90962b684403 33 writeCommand(CMD_SETMULTIPLEX);
jonebuckman 0:90962b684403 34 writeCommand(0x3F);
jonebuckman 0:90962b684403 35 writeCommand(CMD_SETDISPLAYOFFSET);
jonebuckman 0:90962b684403 36 writeCommand(0x0);
jonebuckman 0:90962b684403 37 writeCommand(CMD_SETSTARTLINE | 0x0);
jonebuckman 0:90962b684403 38 writeCommand(CMD_CHARGEPUMP);
jonebuckman 0:90962b684403 39 writeCommand(CMD_CHARGEPUMPON);
jonebuckman 0:90962b684403 40 writeCommand(CMD_MEMORYMODE);
jonebuckman 0:90962b684403 41 writeCommand(0x00);
jonebuckman 0:90962b684403 42 writeCommand(CMD_SEGREMAP | 0x1);
jonebuckman 0:90962b684403 43 writeCommand(CMD_COMSCANDEC);
jonebuckman 0:90962b684403 44 writeCommand(CMD_SETCOMPINS);
jonebuckman 0:90962b684403 45 writeCommand(0x12);
jonebuckman 0:90962b684403 46 writeCommand(CMD_SETCONTRAST);
jonebuckman 0:90962b684403 47 writeCommand(0xCF);
jonebuckman 0:90962b684403 48 writeCommand(CMD_SETPRECHARGE);
jonebuckman 0:90962b684403 49 writeCommand(0xF1);
jonebuckman 0:90962b684403 50 writeCommand(CMD_SETVCOMDETECT);
jonebuckman 0:90962b684403 51 writeCommand(0x40);
jonebuckman 0:90962b684403 52 writeCommand(CMD_DISPLAYALLON_RESUME);
jonebuckman 0:90962b684403 53 writeCommand(CMD_NORMALDISPLAY);
jonebuckman 0:90962b684403 54
jonebuckman 0:90962b684403 55 //Return success
jonebuckman 0:90962b684403 56 return true;
jonebuckman 0:90962b684403 57 } else {
jonebuckman 0:90962b684403 58 //Return failure
jonebuckman 0:90962b684403 59 return false;
jonebuckman 0:90962b684403 60 }
jonebuckman 0:90962b684403 61 }
jonebuckman 0:90962b684403 62
jonebuckman 0:90962b684403 63 void SSD1306_I2C::flush()
jonebuckman 0:90962b684403 64 {
jonebuckman 0:90962b684403 65 //Select low col 0, hi col 0, line 0
jonebuckman 0:90962b684403 66 writeCommand(CMD_SETLOWCOLUMN | 0x0);
jonebuckman 0:90962b684403 67 writeCommand(CMD_SETHIGHCOLUMN | 0x0);
jonebuckman 0:90962b684403 68 writeCommand(CMD_SETSTARTLINE | 0x0);
jonebuckman 0:90962b684403 69
jonebuckman 0:90962b684403 70 //Make sure the first byte in the buffer is the control byte
jonebuckman 0:90962b684403 71 m_Buffer[0] = CONTROL_DATA;
jonebuckman 0:90962b684403 72
jonebuckman 0:90962b684403 73 //Write the buffer
jonebuckman 0:90962b684403 74 m_I2C.write(m_ADDR, m_Buffer, 1025);
jonebuckman 0:90962b684403 75 }
jonebuckman 0:90962b684403 76
jonebuckman 0:90962b684403 77 Display::State SSD1306_I2C::state()
jonebuckman 0:90962b684403 78 {
jonebuckman 0:90962b684403 79 //Return the base class's state
jonebuckman 0:90962b684403 80 return Display::state();
jonebuckman 0:90962b684403 81 }
jonebuckman 0:90962b684403 82
jonebuckman 0:90962b684403 83 void SSD1306_I2C::state(State s)
jonebuckman 0:90962b684403 84 {
jonebuckman 0:90962b684403 85 //Check what the requested state is
jonebuckman 0:90962b684403 86 if (s == Display::DISPLAY_ON) {
jonebuckman 0:90962b684403 87 //Turn the display on
jonebuckman 0:90962b684403 88 writeCommand(CMD_DISPLAYON);
jonebuckman 0:90962b684403 89 } else if (s == Display::DISPLAY_OFF) {
jonebuckman 0:90962b684403 90 //Turn the display off
jonebuckman 0:90962b684403 91 writeCommand(CMD_DISPLAYOFF);
jonebuckman 0:90962b684403 92 }
jonebuckman 0:90962b684403 93
jonebuckman 0:90962b684403 94 //Update the base class
jonebuckman 0:90962b684403 95 Display::state(s);
jonebuckman 0:90962b684403 96 }
jonebuckman 0:90962b684403 97
jonebuckman 0:90962b684403 98 void SSD1306_I2C::drawPixel(int x, int y, unsigned int c)
jonebuckman 0:90962b684403 99 {
jonebuckman 0:90962b684403 100 //Range check the pixel
jonebuckman 0:90962b684403 101 if ((x < 0) || (x >= width()) || (y < 0) || (y >= height()))
jonebuckman 0:90962b684403 102 return;
jonebuckman 0:90962b684403 103
jonebuckman 0:90962b684403 104 //Make sure the color is fully opaque
jonebuckman 0:90962b684403 105 if ((c >> 24) != 255)
jonebuckman 0:90962b684403 106 return;
jonebuckman 0:90962b684403 107
jonebuckman 0:90962b684403 108 //Determine the pixel byte index
jonebuckman 0:90962b684403 109 unsigned short byteIndex = x + (y / 8) * width();
jonebuckman 0:90962b684403 110
jonebuckman 0:90962b684403 111 //HACK: Fix the whole 1025 byte i2c buffer thing
jonebuckman 0:90962b684403 112 byteIndex++;
jonebuckman 0:90962b684403 113
jonebuckman 0:90962b684403 114 //Set or clear the pixel
jonebuckman 0:90962b684403 115 if ((c & 0x00FFFFFF) > 0)
jonebuckman 0:90962b684403 116 m_Buffer[byteIndex] |= (1 << (y % 8));
jonebuckman 0:90962b684403 117 else
jonebuckman 0:90962b684403 118 m_Buffer[byteIndex] &= ~(1 << (y % 8));
jonebuckman 0:90962b684403 119 }
jonebuckman 0:90962b684403 120
jonebuckman 0:90962b684403 121 void SSD1306_I2C::writeCommand(char command)
jonebuckman 0:90962b684403 122 {
jonebuckman 0:90962b684403 123 //Create a temporary buffer
jonebuckman 0:90962b684403 124 char buff[2];
jonebuckman 0:90962b684403 125
jonebuckman 0:90962b684403 126 //Load the control byte and 8-bit command
jonebuckman 0:90962b684403 127 buff[0] = CONTROL_COMMAND;
jonebuckman 0:90962b684403 128 buff[1] = command;
jonebuckman 0:90962b684403 129
jonebuckman 0:90962b684403 130 //Write the command
jonebuckman 0:90962b684403 131 m_I2C.write(m_ADDR, buff, 2);
jonebuckman 0:90962b684403 132 }
jonebuckman 0:90962b684403 133
jonebuckman 0:90962b684403 134 void SSD1306_I2C::writeData(char data)
jonebuckman 0:90962b684403 135 {
jonebuckman 0:90962b684403 136 //Create a temporary buffer
jonebuckman 0:90962b684403 137 char buff[2];
jonebuckman 0:90962b684403 138
jonebuckman 0:90962b684403 139 //Load the control byte and 8-bit data
jonebuckman 0:90962b684403 140 buff[0] = CONTROL_DATA;
jonebuckman 0:90962b684403 141 buff[1] = data;
jonebuckman 0:90962b684403 142
jonebuckman 0:90962b684403 143 //Write the data
jonebuckman 0:90962b684403 144 m_I2C.write(m_ADDR, buff, 2);
jonebuckman 0:90962b684403 145 }