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https://github.com/DCC-EX/CommandStation-EX.git
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97f3450621
Simplify the initialisation in the SSD1306Ascii driver, by removing some of the complex structures that were inherited from the library on which it is based. This should also allow it to compile on the ESP32 platform.
372 lines
15 KiB
C++
372 lines
15 KiB
C++
/* Based on Arduino SSD1306Ascii Library, Copyright (C) 2015 by William Greiman
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* Modifications (C) 2021 Neil McKechnie
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*
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* This file is part of CommandStation-EX
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*
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* This Library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This Library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with the Arduino SSD1306Ascii Library. If not, see
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* <http://www.gnu.org/licenses/>.
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*/
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#include "SSD1306Ascii.h"
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#include "I2CManager.h"
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#include "FSH.h"
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//==============================================================================
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// SSD1306/SSD1106 I2C command bytes
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//------------------------------------------------------------------------------
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/** Set Lower Column Start Address for Page Addressing Mode. */
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static const uint8_t SSD1306_SETLOWCOLUMN = 0x00;
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/** Set Higher Column Start Address for Page Addressing Mode. */
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static const uint8_t SSD1306_SETHIGHCOLUMN = 0x10;
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/** Set Memory Addressing Mode. */
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static const uint8_t SSD1306_MEMORYMODE = 0x20;
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/** Set display RAM display start line register from 0 - 63. */
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static const uint8_t SSD1306_SETSTARTLINE = 0x40;
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/** Set Display Contrast to one of 256 steps. */
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static const uint8_t SSD1306_SETCONTRAST = 0x81;
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/** Enable or disable charge pump. Follow with 0X14 enable, 0X10 disable. */
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static const uint8_t SSD1306_CHARGEPUMP = 0x8D;
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/** Set Segment Re-map between data column and the segment driver. */
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static const uint8_t SSD1306_SEGREMAP = 0xA0;
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/** Resume display from GRAM content. */
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static const uint8_t SSD1306_DISPLAYALLON_RESUME = 0xA4;
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/** Force display on regardless of GRAM content. */
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static const uint8_t SSD1306_DISPLAYALLON = 0xA5;
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/** Set Normal Display. */
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static const uint8_t SSD1306_NORMALDISPLAY = 0xA6;
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/** Set Inverse Display. */
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static const uint8_t SSD1306_INVERTDISPLAY = 0xA7;
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/** Set Multiplex Ratio from 16 to 63. */
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static const uint8_t SSD1306_SETMULTIPLEX = 0xA8;
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/** Set Display off. */
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static const uint8_t SSD1306_DISPLAYOFF = 0xAE;
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/** Set Display on. */
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static const uint8_t SSD1306_DISPLAYON = 0xAF;
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/**Set GDDRAM Page Start Address. */
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static const uint8_t SSD1306_SETSTARTPAGE = 0xB0;
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/** Set COM output scan direction normal. */
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static const uint8_t SSD1306_COMSCANINC = 0xC0;
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/** Set COM output scan direction reversed. */
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static const uint8_t SSD1306_COMSCANDEC = 0xC8;
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/** Set Display Offset. */
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static const uint8_t SSD1306_SETDISPLAYOFFSET = 0xD3;
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/** Sets COM signals pin configuration to match the OLED panel layout. */
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static const uint8_t SSD1306_SETCOMPINS = 0xDA;
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/** This command adjusts the VCOMH regulator output. */
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static const uint8_t SSD1306_SETVCOMDETECT = 0xDB;
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/** Set Display Clock Divide Ratio/ Oscillator Frequency. */
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static const uint8_t SSD1306_SETDISPLAYCLOCKDIV = 0xD5;
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/** Set Pre-charge Period */
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static const uint8_t SSD1306_SETPRECHARGE = 0xD9;
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/** Deactivate scroll */
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static const uint8_t SSD1306_DEACTIVATE_SCROLL = 0x2E;
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/** No Operation Command. */
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static const uint8_t SSD1306_NOP = 0xE3;
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//------------------------------------------------------------------------------
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/** Set Pump voltage value: (30H~33H) 6.4, 7.4, 8.0 (POR), 9.0. */
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static const uint8_t SH1106_SET_PUMP_VOLTAGE = 0x30;
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/** First byte of set charge pump mode */
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static const uint8_t SH1106_SET_PUMP_MODE = 0xAD;
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/** Second byte charge pump on. */
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static const uint8_t SH1106_PUMP_ON = 0x8B;
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/** Second byte charge pump off. */
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static const uint8_t SH1106_PUMP_OFF = 0x8A;
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//------------------------------------------------------------------------------
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// Sequence of blank pixels, to optimise clearing screen.
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// Send a maximum of 30 pixels per transmission.
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const uint8_t FLASH SSD1306AsciiWire::blankPixels[30] =
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{0x40, // First byte specifies data mode
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
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//==============================================================================
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// this section is based on https://github.com/adafruit/Adafruit_SSD1306
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/** Initialization commands for a 128x32 or 128x64 SSD1306 oled display. */
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const uint8_t FLASH SSD1306AsciiWire::Adafruit128xXXinit[] = {
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// Init sequence for Adafruit 128x32/64 OLED module
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0x00, // Set to command mode
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SSD1306_DISPLAYOFF,
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SSD1306_SETDISPLAYCLOCKDIV, 0x80, // the suggested ratio 0x80
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SSD1306_SETMULTIPLEX, 0x3F, // ratio 64 (initially)
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SSD1306_SETDISPLAYOFFSET, 0x0, // no offset
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SSD1306_SETSTARTLINE | 0x0, // line #0
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SSD1306_CHARGEPUMP, 0x14, // internal vcc
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SSD1306_MEMORYMODE, 0x02, // page mode
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SSD1306_SEGREMAP | 0x1, // column 127 mapped to SEG0
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SSD1306_COMSCANDEC, // column scan direction reversed
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SSD1306_SETCOMPINS, 0X12, // set COM pins
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SSD1306_SETCONTRAST, 0x7F, // contrast level 127
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SSD1306_SETPRECHARGE, 0xF1, // pre-charge period (1, 15)
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SSD1306_SETVCOMDETECT, 0x40, // vcomh regulator level
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SSD1306_DISPLAYALLON_RESUME,
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SSD1306_NORMALDISPLAY,
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SSD1306_DISPLAYON
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};
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//------------------------------------------------------------------------------
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// This section is based on https://github.com/stanleyhuangyc/MultiLCD
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/** Initialization commands for a 128x64 SH1106 oled display. */
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const uint8_t FLASH SSD1306AsciiWire::SH1106_132x64init[] = {
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0x00, // Set to command mode
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SSD1306_DISPLAYOFF,
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SSD1306_SETDISPLAYCLOCKDIV, 0X80, // set osc division
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SSD1306_SETMULTIPLEX, 0x3F, // ratio 64
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SSD1306_SETDISPLAYOFFSET, 0X00, // set display offset
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SSD1306_SETSTARTPAGE | 0X0, // set page address
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SSD1306_SETSTARTLINE | 0x0, // set start line
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SH1106_SET_PUMP_MODE, SH1106_PUMP_ON, // set charge pump enable
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SSD1306_SEGREMAP | 0X1, // set segment remap
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SSD1306_COMSCANDEC, // Com scan direction
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SSD1306_SETCOMPINS, 0X12, // set COM pins
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SSD1306_SETCONTRAST, 0x80, // 128
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SSD1306_SETPRECHARGE, 0X1F, // set pre-charge period
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SSD1306_SETVCOMDETECT, 0x40, // set vcomh
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SH1106_SET_PUMP_VOLTAGE | 0X2, // 8.0 volts
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SSD1306_NORMALDISPLAY, // normal / reverse
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SSD1306_DISPLAYON
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};
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//==============================================================================
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// SSD1306AsciiWire Method Definitions
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//------------------------------------------------------------------------------
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// Constructor
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SSD1306AsciiWire::SSD1306AsciiWire(int width, int height) {
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m_displayWidth = width;
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m_displayHeight = height;
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// Set size in characters in base class
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lcdRows = height / 8;
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lcdCols = width / 6;
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m_col = 0;
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m_row = 0;
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m_colOffset = 0;
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I2CManager.begin();
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I2CManager.setClock(400000L); // Set max supported I2C speed
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for (byte address = 0x3c; address <= 0x3d; address++) {
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if (I2CManager.exists(address)) {
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m_i2cAddr = address;
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if (m_displayWidth==132 && m_displayHeight==64) {
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// SH1106 display. This uses 128x64 centered within a 132x64 OLED.
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m_colOffset = 2;
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I2CManager.write_P(address, SH1106_132x64init, sizeof(SH1106_132x64init));
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} else if (m_displayWidth==128 && (m_displayHeight==64 || m_displayHeight==32)) {
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// SSD1306 128x64 or 128x32
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I2CManager.write_P(address, Adafruit128xXXinit, sizeof(Adafruit128xXXinit));
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if (m_displayHeight == 32)
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I2CManager.write(address, 5, 0, // Set command mode
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SSD1306_SETMULTIPLEX, 0x1F, // ratio 32
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SSD1306_SETCOMPINS, 0x02); // sequential COM pins, disable remap
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} else {
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DIAG(F("OLED configuration option not recognised"));
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return;
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}
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// Device found
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DIAG(F("%dx%d OLED display configured on I2C:x%x"), width, height, address);
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// Set singleton address
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lcdDisplay = this;
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clear();
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return;
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}
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}
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DIAG(F("OLED display not found"));
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}
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/* Clear screen by writing blank pixels. */
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void SSD1306AsciiWire::clearNative() {
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const int maxBytes = sizeof(blankPixels); // max number of bytes sendable over Wire
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for (uint8_t r = 0; r <= m_displayHeight/8 - 1; r++) {
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setRowNative(r); // Position at start of row to be erased
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for (uint8_t c = 0; c <= m_displayWidth - 1; c += maxBytes-1) {
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uint8_t len = min(m_displayWidth-c, maxBytes-1) + 1;
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I2CManager.write_P(m_i2cAddr, blankPixels, len); // Write a number of blank columns
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}
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}
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}
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//------------------------------------------------------------------------------
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// Set cursor position (by text line)
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void SSD1306AsciiWire::setRowNative(uint8_t line) {
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// Calculate pixel position from line number
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uint8_t row = line*8;
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if (row < m_displayHeight) {
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m_row = row;
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m_col = m_colOffset;
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// Before using buffer, wait for last request to complete
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requestBlock.wait();
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// Build output buffer for I2C
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uint8_t len = 0;
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outputBuffer[len++] = 0x00; // Set to command mode
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outputBuffer[len++] = SSD1306_SETLOWCOLUMN | (m_col & 0XF);
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outputBuffer[len++] = SSD1306_SETHIGHCOLUMN | (m_col >> 4);
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outputBuffer[len++] = SSD1306_SETSTARTPAGE | (m_row/8);
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I2CManager.write(m_i2cAddr, outputBuffer, len, &requestBlock);
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}
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}
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//------------------------------------------------------------------------------
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// Write a character to the OLED
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size_t SSD1306AsciiWire::writeNative(uint8_t ch) {
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const uint8_t* base = m_font;
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if (ch < m_fontFirstChar || ch >= (m_fontFirstChar + m_fontCharCount))
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return 0;
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// Check if character would be partly or wholly off the display
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if (m_col + fontWidth > m_displayWidth)
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return 0;
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#if defined(NOLOWERCASE)
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// Adjust if lowercase is missing
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if (ch >= 'a') {
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if (ch <= 'z')
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ch = ch - 'a' + 'A'; // Capitalise
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else
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ch -= 26; // Allow for missing lowercase letters
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}
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#endif
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ch -= m_fontFirstChar;
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base += fontWidth * ch;
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// Before using buffer, wait for last request to complete
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requestBlock.wait();
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// Build output buffer for I2C
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outputBuffer[0] = 0x40; // set SSD1306 controller to data mode
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uint8_t bufferPos = 1;
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// Copy character pixel columns
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for (uint8_t i = 0; i < fontWidth; i++)
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outputBuffer[bufferPos++] = GETFLASH(base++);
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// Add blank pixels between letters
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for (uint8_t i = 0; i < letterSpacing; i++)
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outputBuffer[bufferPos++] = 0;
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// Write the data to I2C display
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I2CManager.write(m_i2cAddr, outputBuffer, bufferPos, &requestBlock);
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m_col += fontWidth + letterSpacing;
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return 1;
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}
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//------------------------------------------------------------------------------
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// Font characters, 5x7 pixels, 0x61 characters starting at 0x20.
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// Lower case characters optionally omitted.
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const uint8_t FLASH SSD1306AsciiWire::System5x7[] = {
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// Fixed width; char width table not used !!!!
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// or with lowercase character omitted.
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// font data
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0x00, 0x00, 0x00, 0x00, 0x00, // (space)
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0x00, 0x00, 0x5F, 0x00, 0x00, // !
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0x00, 0x07, 0x00, 0x07, 0x00, // "
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0x14, 0x7F, 0x14, 0x7F, 0x14, // #
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0x24, 0x2A, 0x7F, 0x2A, 0x12, // $
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0x23, 0x13, 0x08, 0x64, 0x62, // %
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0x36, 0x49, 0x55, 0x22, 0x50, // &
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0x00, 0x05, 0x03, 0x00, 0x00, // '
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0x00, 0x1C, 0x22, 0x41, 0x00, // (
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0x00, 0x41, 0x22, 0x1C, 0x00, // )
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0x08, 0x2A, 0x1C, 0x2A, 0x08, // *
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0x08, 0x08, 0x3E, 0x08, 0x08, // +
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0x00, 0x50, 0x30, 0x00, 0x00, // ,
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0x08, 0x08, 0x08, 0x08, 0x08, // -
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0x00, 0x60, 0x60, 0x00, 0x00, // .
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0x20, 0x10, 0x08, 0x04, 0x02, // /
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0x3E, 0x51, 0x49, 0x45, 0x3E, // 0
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0x00, 0x42, 0x7F, 0x40, 0x00, // 1
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0x42, 0x61, 0x51, 0x49, 0x46, // 2
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0x21, 0x41, 0x45, 0x4B, 0x31, // 3
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0x18, 0x14, 0x12, 0x7F, 0x10, // 4
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0x27, 0x45, 0x45, 0x45, 0x39, // 5
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0x3C, 0x4A, 0x49, 0x49, 0x30, // 6
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0x01, 0x71, 0x09, 0x05, 0x03, // 7
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0x36, 0x49, 0x49, 0x49, 0x36, // 8
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0x06, 0x49, 0x49, 0x29, 0x1E, // 9
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0x00, 0x36, 0x36, 0x00, 0x00, // :
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0x00, 0x56, 0x36, 0x00, 0x00, // ;
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0x00, 0x08, 0x14, 0x22, 0x41, // <
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0x14, 0x14, 0x14, 0x14, 0x14, // =
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0x41, 0x22, 0x14, 0x08, 0x00, // >
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0x02, 0x01, 0x51, 0x09, 0x06, // ?
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0x32, 0x49, 0x79, 0x41, 0x3E, // @
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0x7E, 0x11, 0x11, 0x11, 0x7E, // A
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0x7F, 0x49, 0x49, 0x49, 0x36, // B
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0x3E, 0x41, 0x41, 0x41, 0x22, // C
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0x7F, 0x41, 0x41, 0x22, 0x1C, // D
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0x7F, 0x49, 0x49, 0x49, 0x41, // E
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0x7F, 0x09, 0x09, 0x01, 0x01, // F
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0x3E, 0x41, 0x41, 0x51, 0x32, // G
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0x7F, 0x08, 0x08, 0x08, 0x7F, // H
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0x00, 0x41, 0x7F, 0x41, 0x00, // I
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0x20, 0x40, 0x41, 0x3F, 0x01, // J
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0x7F, 0x08, 0x14, 0x22, 0x41, // K
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0x7F, 0x40, 0x40, 0x40, 0x40, // L
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0x7F, 0x02, 0x04, 0x02, 0x7F, // M
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0x7F, 0x04, 0x08, 0x10, 0x7F, // N
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0x3E, 0x41, 0x41, 0x41, 0x3E, // O
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0x7F, 0x09, 0x09, 0x09, 0x06, // P
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0x3E, 0x41, 0x51, 0x21, 0x5E, // Q
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0x7F, 0x09, 0x19, 0x29, 0x46, // R
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0x46, 0x49, 0x49, 0x49, 0x31, // S
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0x01, 0x01, 0x7F, 0x01, 0x01, // T
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0x3F, 0x40, 0x40, 0x40, 0x3F, // U
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0x1F, 0x20, 0x40, 0x20, 0x1F, // V
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0x7F, 0x20, 0x18, 0x20, 0x7F, // W
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0x63, 0x14, 0x08, 0x14, 0x63, // X
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0x03, 0x04, 0x78, 0x04, 0x03, // Y
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0x61, 0x51, 0x49, 0x45, 0x43, // Z
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0x00, 0x00, 0x7F, 0x41, 0x41, // [
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0x02, 0x04, 0x08, 0x10, 0x20, // "\"
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0x41, 0x41, 0x7F, 0x00, 0x00, // ]
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0x04, 0x02, 0x01, 0x02, 0x04, // ^
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0x40, 0x40, 0x40, 0x40, 0x40, // _
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0x00, 0x01, 0x02, 0x04, 0x00, // `
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#ifndef NOLOWERCASE
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0x20, 0x54, 0x54, 0x54, 0x78, // a
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0x7F, 0x48, 0x44, 0x44, 0x38, // b
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0x38, 0x44, 0x44, 0x44, 0x20, // c
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0x38, 0x44, 0x44, 0x48, 0x7F, // d
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0x38, 0x54, 0x54, 0x54, 0x18, // e
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0x08, 0x7E, 0x09, 0x01, 0x02, // f
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0x08, 0x14, 0x54, 0x54, 0x3C, // g
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0x7F, 0x08, 0x04, 0x04, 0x78, // h
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0x00, 0x44, 0x7D, 0x40, 0x00, // i
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0x20, 0x40, 0x44, 0x3D, 0x00, // j
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0x00, 0x7F, 0x10, 0x28, 0x44, // k
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0x00, 0x41, 0x7F, 0x40, 0x00, // l
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0x7C, 0x04, 0x18, 0x04, 0x78, // m
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0x7C, 0x08, 0x04, 0x04, 0x78, // n
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0x38, 0x44, 0x44, 0x44, 0x38, // o
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0x7C, 0x14, 0x14, 0x14, 0x08, // p
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0x08, 0x14, 0x14, 0x18, 0x7C, // q
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0x7C, 0x08, 0x04, 0x04, 0x08, // r
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0x48, 0x54, 0x54, 0x54, 0x20, // s
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0x04, 0x3F, 0x44, 0x40, 0x20, // t
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0x3C, 0x40, 0x40, 0x20, 0x7C, // u
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0x1C, 0x20, 0x40, 0x20, 0x1C, // v
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0x3C, 0x40, 0x30, 0x40, 0x3C, // w
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0x44, 0x28, 0x10, 0x28, 0x44, // x
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0x0C, 0x50, 0x50, 0x50, 0x3C, // y
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0x44, 0x64, 0x54, 0x4C, 0x44, // z
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#endif
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0x00, 0x08, 0x36, 0x41, 0x00, // {
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0x00, 0x00, 0x7F, 0x00, 0x00, // |
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0x00, 0x41, 0x36, 0x08, 0x00, // }
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0x08, 0x08, 0x2A, 0x1C, 0x08, // ->
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0x08, 0x1C, 0x2A, 0x08, 0x08, // <-
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0x00, 0x06, 0x09, 0x09, 0x06 // degree symbol
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};
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