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/**
* The MIT License (MIT)
*
* Copyright (c) 2016 by Daniel Eichhorn
* Copyright (c) 2016 by Fabrice Weinberg
*
* 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.
*
* Credits for parts of this code go to Mike Rankin. Thank you so much for sharing!
*/
#ifndef SSD1306Spi_h
#define SSD1306Spi_h
#include "OLEDDisplay.h"
#include <SPI.h>
#if F_CPU == 160000000L
#define BRZO_I2C_SPEED 1000
#else
#define BRZO_I2C_SPEED 800
#endif
class SSD1306Spi : public OLEDDisplay {
private:
uint8_t _rst;
uint8_t _dc;
uint8_t _cs;
public:
SSD1306Spi(uint8_t _rst, uint8_t _dc, uint8_t _cs) {
this->_rst = _rst;
this->_dc = _dc;
this->_cs = _cs;
}
bool connect(){
pinMode(_dc, OUTPUT);
pinMode(_cs, OUTPUT);
pinMode(_rst, OUTPUT);
SPI.begin ();
SPI.setClockDivider (SPI_CLOCK_DIV2);
// Pulse Reset low for 10ms
digitalWrite(_rst, HIGH);
delay(1);
digitalWrite(_rst, LOW);
delay(10);
digitalWrite(_rst, HIGH);
return true;
}
void display(void) {
#ifdef OLEDDISPLAY_DOUBLE_BUFFER
uint8_t minBoundY = ~0;
uint8_t maxBoundY = 0;
uint8_t minBoundX = ~0;
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 < (DISPLAY_HEIGHT / 8); y++) {
for (x = 0; x < DISPLAY_WIDTH; x++) {
uint16_t pos = x + y * DISPLAY_WIDTH;
if (buffer[pos] != buffer_back[pos]) {
minBoundY = _min(minBoundY, y);
maxBoundY = _max(maxBoundY, y);
minBoundX = _min(minBoundX, x);
maxBoundX = _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 == ~0) return;
sendCommand(COLUMNADDR);
sendCommand(minBoundX);
sendCommand(maxBoundX);
sendCommand(PAGEADDR);
sendCommand(minBoundY);
sendCommand(maxBoundY);
digitalWrite(_cs, HIGH);
digitalWrite(_dc, HIGH); // data mode
digitalWrite(_cs, LOW);
for (y = minBoundY; y <= maxBoundY; y++) {
for (x = minBoundX; x <= maxBoundX; x++) {
SPI.transfer(buffer[x + y * DISPLAY_WIDTH]);
}
yield();
}
digitalWrite(_cs, HIGH);
#else
// No double buffering
sendCommand(COLUMNADDR);
sendCommand(0x0);
sendCommand(0x7F);
sendCommand(PAGEADDR);
sendCommand(0x0);
sendCommand(0x7);
digitalWrite(_cs, HIGH);
digitalWrite(_dc, HIGH); // data mode
digitalWrite(_cs, LOW);
for (uint16_t i=0; i<DISPLAY_BUFFER_SIZE; i++) {
SPI.transfer(buffer[i]);
yield();
}
digitalWrite(_cs, HIGH);
#endif
}
private:
inline void sendCommand(uint8_t com) __attribute__((always_inline)){
digitalWrite(_cs, HIGH);
digitalWrite(_dc, LOW);
digitalWrite(_cs, LOW);
SPI.transfer(com);
digitalWrite(_cs, HIGH);
}
};
#endif