153 lines
4.6 KiB
C++
153 lines
4.6 KiB
C++
/**
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* The MIT License (MIT)
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*
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* Copyright (c) 2019 by Helmut Tschemernjak - www.radioshuttle.de
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* ThingPulse invests considerable time and money to develop these open source libraries.
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* Please support us by buying our products (and not the clones) from
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* https://thingpulse.com
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*
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*/
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#ifndef SSD1306I2C_h
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#define SSD1306I2C_h
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#ifdef __MBED__
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#include "OLEDDisplay.h"
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#include <mbed.h>
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#ifndef UINT8_MAX
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#define UINT8_MAX 0xff
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#endif
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class SSD1306I2C : public OLEDDisplay {
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public:
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SSD1306I2C(uint8_t _address, PinName _sda, PinName _scl, OLEDDISPLAY_GEOMETRY g = GEOMETRY_128_64) {
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setGeometry(g);
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this->_address = _address << 1; // convert from 7 to 8 bit for mbed.
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this->_sda = _sda;
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this->_scl = _scl;
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_i2c = new I2C(_sda, _scl);
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}
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bool connect() {
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// mbed supports 100k and 400k some device maybe 1000k
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#ifdef TARGET_STM32L4
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_i2c->frequency(1000000);
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#else
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_i2c->frequency(400000);
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#endif
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return true;
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}
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void display(void) {
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const int x_offset = (128 - this->width()) / 2;
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#ifdef OLEDDISPLAY_DOUBLE_BUFFER
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uint8_t minBoundY = UINT8_MAX;
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uint8_t maxBoundY = 0;
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uint8_t minBoundX = UINT8_MAX;
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uint8_t maxBoundX = 0;
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uint8_t x, y;
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// Calculate the Y bounding box of changes
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// and copy buffer[pos] to buffer_back[pos];
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for (y = 0; y < (this->height() / 8); y++) {
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for (x = 0; x < this->width(); x++) {
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uint16_t pos = x + y * this->width();
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if (buffer[pos] != buffer_back[pos]) {
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minBoundY = std::min(minBoundY, y);
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maxBoundY = std::max(maxBoundY, y);
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minBoundX = std::min(minBoundX, x);
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maxBoundX = std::max(maxBoundX, x);
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}
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buffer_back[pos] = buffer[pos];
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}
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yield();
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}
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// If the minBoundY wasn't updated
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// we can savely assume that buffer_back[pos] == buffer[pos]
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// holdes true for all values of pos
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if (minBoundY == UINT8_MAX) return;
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sendCommand(COLUMNADDR);
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sendCommand(x_offset + minBoundX); // column start address (0 = reset)
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sendCommand(x_offset + maxBoundX); // column end address (127 = reset)
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sendCommand(PAGEADDR);
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sendCommand(minBoundY); // page start address
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sendCommand(maxBoundY); // page end address
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for (y = minBoundY; y <= maxBoundY; y++) {
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uint8_t *start = &buffer[(minBoundX + y * this->width())-1];
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uint8_t save = *start;
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*start = 0x40; // control
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_i2c->write(_address, (char *)start, (maxBoundX-minBoundX) + 1 + 1);
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*start = save;
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}
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#else
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sendCommand(COLUMNADDR);
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sendCommand(x_offset); // column start address (0 = reset)
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sendCommand(x_offset + (this->width() - 1));// column end address (127 = reset)
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sendCommand(PAGEADDR);
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sendCommand(0x0); // page start address (0 = reset)
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if (geometry == GEOMETRY_128_64) {
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sendCommand(0x7);
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} else if (geometry == GEOMETRY_128_32) {
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sendCommand(0x3);
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}
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buffer[-1] = 0x40; // control
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_i2c->write(_address, (char *)&buffer[-1], displayBufferSize + 1);
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#endif
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}
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private:
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int getBufferOffset(void) {
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return 0;
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}
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inline void sendCommand(uint8_t command) __attribute__((always_inline)) {
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char _data[2];
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_data[0] = 0x80; // control
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_data[1] = command;
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_i2c->write(_address, _data, sizeof(_data));
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}
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uint8_t _address;
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PinName _sda;
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PinName _scl;
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I2C *_i2c;
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};
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#endif
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#endif
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