From 1d67277383eed082527ee3b817dfe4ad6c458c6e Mon Sep 17 00:00:00 2001
From: Fabrice Weinberg <Fabrice@weinberg.me>
Date: Thu, 11 Aug 2016 14:08:35 +0200
Subject: [PATCH] Implements support for SH1106 SPI
---
SH1106Spi.h | 128 ++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 128 insertions(+)
create mode 100644 SH1106Spi.h
diff --git a/SH1106Spi.h b/SH1106Spi.h
new file mode 100644
index 0000000..0a64e27
--- /dev/null
+++ b/SH1106Spi.h
@@ -0,0 +1,128 @@
+/**
+ * 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 SH1106Spi_h
+#define SH1106Spi_h
+
+#include "OLEDDisplay.h"
+#include <SPI.h>
+
+class SH1106Spi : public OLEDDisplay {
+ private:
+ uint8_t _rst;
+ uint8_t _dc;
+
+ public:
+
+ SH1106Spi(uint8_t _rst, uint8_t _dc) {
+ this->_rst = _rst;
+ this->_dc = _dc;
+ }
+
+ bool connect(){
+ pinMode(_dc, 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;
+
+ // Calculate the colum offset
+ uint8_t minBoundXp2H = (minBoundX + 2) & 0x0F;
+ uint8_t minBoundXp2L = 0x10 | ((minBoundX + 2) >> 4 );
+
+ for (y = minBoundY; y <= maxBoundY; y++) {
+ sendCommand(0xB0 + y);
+ sendCommand(minBoundXp2H);
+ sendCommand(minBoundXp2L);
+ digitalWrite(_dc, HIGH); // data mode
+ for (x = minBoundX; x <= maxBoundX; x++) {
+ SPI.transfer(buffer[x + y * DISPLAY_WIDTH]);
+ }
+ yield();
+ }
+ #else
+ for (uint8_t y=0; y<DISPLAY_HEIGHT/8; y++) {
+ sendCommand(0xB0 + y);
+ sendCommand(0x02);
+ sendCommand(0x10);
+ digitalWrite(_dc, HIGH); // data mode
+ for( uint8_t x=0; x < DISPLAY_WIDTH; x++) {
+ SPI.transfer(buffer[x + y * DISPLAY_WIDTH]);
+ }
+ yield();
+ }
+ #endif
+ }
+
+ private:
+ inline void sendCommand(uint8_t com) __attribute__((always_inline)){
+ digitalWrite(_dc, LOW);
+ SPI.transfer(com);
+ }
+};
+
+#endif
--
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