ThingPulse OLED SSD1306
Dependents: Turtle_RadioShuttle mbed-os5-F303-18650-Manager-tp4056 Kretanje_kroz_izbornike_OLED128x64_4tipke
Diff: SSD1306I2C.h
- Revision:
- 0:56dd5df33ab4
- Child:
- 1:9270c15c6aea
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/SSD1306I2C.h Wed Apr 10 14:15:31 2019 +0000 @@ -0,0 +1,154 @@ +/** + * The MIT License (MIT) + * + * Copyright (c) 2019 by Helmut Tschemernjak - www.radioshuttle.de + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in all + * copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + * ThingPulse invests considerable time and money to develop these open source libraries. + * Please support us by buying our products (and not the clones) from + * https://thingpulse.com + * + */ + +#ifndef SSD1306I2C_h +#define SSD1306I2C_h + + +#ifdef __MBED__ + +#include "OLEDDisplay.h" +#include <mbed.h> + +#ifndef UINT8_MAX + #define UINT8_MAX 0xff +#endif + +class SSD1306I2C : public OLEDDisplay { +public: + SSD1306I2C(uint8_t _address, PinName _sda, PinName _scl, OLEDDISPLAY_GEOMETRY g = GEOMETRY_128_64) { + setGeometry(g); + + this->_address = _address << 1; // convert from 7 to 8 bit for mbed. + this->_sda = _sda; + this->_scl = _scl; + _i2c = new I2C(_sda, _scl); + } + + bool connect() { + // mbed supports 100k and 400k some device maybe 1000k +#ifdef TARGET_STM32L4 + _i2c->frequency(1000000); +#else + _i2c->frequency(400000); +#endif + return true; + } + + void display(void) { + const int x_offset = (128 - this->width()) / 2; +#ifdef OLEDDISPLAY_DOUBLE_BUFFER + uint8_t minBoundY = UINT8_MAX; + uint8_t maxBoundY = 0; + + uint8_t minBoundX = UINT8_MAX; + uint8_t maxBoundX = 0; + uint8_t x, y; + + // Calculate the Y bounding box of changes + // and copy buffer[pos] to buffer_back[pos]; + for (y = 0; y < (this->height() / 8); y++) { + for (x = 0; x < this->width(); x++) { + uint16_t pos = x + y * this->width(); + if (buffer[pos] != buffer_back[pos]) { + minBoundY = std::min(minBoundY, y); + maxBoundY = std::max(maxBoundY, y); + minBoundX = std::min(minBoundX, x); + maxBoundX = std::max(maxBoundX, x); + } + buffer_back[pos] = buffer[pos]; + } + yield(); + } + + // If the minBoundY wasn't updated + // we can savely assume that buffer_back[pos] == buffer[pos] + // holdes true for all values of pos + + if (minBoundY == UINT8_MAX) return; + + sendCommand(COLUMNADDR); + sendCommand(x_offset + minBoundX); // column start address (0 = reset) + sendCommand(x_offset + maxBoundX); // column end address (127 = reset) + + sendCommand(PAGEADDR); + sendCommand(minBoundY); // page start address + sendCommand(maxBoundY); // page end address + + for (y = minBoundY; y <= maxBoundY; y++) { + uint8_t *start = &buffer[(minBoundX + y * this->width())-1]; + uint8_t save = *start; + + *start = 0x40; // control + _i2c->write(_address, (char *)start, (maxBoundX-minBoundX) + 1 + 1); + *start = save; + } +#else + + sendCommand(COLUMNADDR); + sendCommand(x_offset); // column start address (0 = reset) + sendCommand(x_offset + (this->width() - 1));// column end address (127 = reset) + + sendCommand(PAGEADDR); + sendCommand(0x0); // page start address (0 = reset) + sendCommand((this->height() / 8) - 1); // page end address 7 + + if (geometry == GEOMETRY_128_64) { + sendCommand(0x7); + } else if (geometry == GEOMETRY_128_32) { + sendCommand(0x3); + } + + buffer[-1] = 0x40; // control + _i2c->write(_address, (char *)&buffer[-1], displayBufferSize + 1); +#endif + } + +private: + int getBufferOffset(void) { + return 0; + } + + inline void sendCommand(uint8_t command) __attribute__((always_inline)) { + char _data[2]; + _data[0] = 0x80; // control + _data[1] = command; + _i2c->write(_address, _data, sizeof(_data)); + } + + uint8_t _address; + PinName _sda; + PinName _scl; + I2C *_i2c; +}; + +#endif + +#endif +