ST7565 LCD

Diff: st7565LCD.cpp

Revision:

0:f2eba6cbd093

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/st7565LCD.cpp	Tue Mar 18 09:26:16 2014 +0000
@@ -0,0 +1,561 @@
+/*
+$Id:$
+
+ST7565 LCD library!
+
+Copyright (C) 2010 Limor Fried, Adafruit Industries
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+
+// some of this code was written by <cstone@pobox.com> originally; it is in the public domain.
+
+
+******the library is modified for mbed**********
+    http://www.adafruit.com/products/250
+    
+    *!function drawbitmap(); is left undone!*
+    
+                    2014/03/18     by imachooon
+                    mailto: imachooon@gmail.com
+************************************************
+*/
+
+#include "st7565LCD.h"
+#include "st7565LCDfont.h"
+
+#define ST7565_STARTBYTES 1
+
+uint8_t is_reversed = 0;
+
+// a handy reference to where the pages are on the screen
+const uint8_t pagemap[] = { 3, 2, 1, 0, 7, 6, 5, 4 };
+
+// a 5x7 font table
+extern const uint8_t font[];
+
+// the memory buffer for the LCD
+uint8_t st7565_buffer[1024] = {
+    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+
+    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+    0x0, 0x0, 0x0, 0x3, 0x7, 0xF, 0x1F, 0x1F, 0x3F, 0x3F, 0x3F, 0x3F, 0x7, 0x0, 0x0, 0x0,
+    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+    0x0, 0x0, 0x7F, 0x3F, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+    0x0, 0x0, 0x1F, 0x3F, 0x70, 0x70, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x6, 0x6, 0x0, 0x0, 0x0, 0x3, 0x3,
+    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+
+    0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0xF, 0x7, 0x7,
+    0x7, 0x3F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x3E, 0x0, 0x0,
+    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xF, 0x3F,
+    0x70, 0x60, 0x60, 0x60, 0x60, 0x30, 0x7F, 0x3F, 0x0, 0x0, 0x1F, 0x3F, 0x70, 0x60, 0x60, 0x60,
+    0x60, 0x39, 0xFF, 0xFF, 0x0, 0x6, 0x1F, 0x39, 0x60, 0x60, 0x60, 0x60, 0x30, 0x3F, 0x7F, 0x0,
+    0x0, 0x60, 0xFF, 0xFF, 0x60, 0x60, 0x0, 0x7F, 0x7F, 0x70, 0x60, 0x60, 0x40, 0x0, 0x7F, 0x7F,
+    0x0, 0x0, 0x0, 0x0, 0x7F, 0x7F, 0x0, 0x0, 0x0, 0x7F, 0x7F, 0x0, 0x0, 0x60, 0xFF, 0xFF,
+    0x60, 0x60, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+
+    0x80, 0xF8, 0xFC, 0xFE, 0xFE, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xEF, 0xE7, 0xE7, 0xE3,
+    0xF3, 0xF9, 0xFF, 0xFF, 0xFF, 0xF7, 0x7, 0x1F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x7F, 0xFF,
+    0x7F, 0x7F, 0x7F, 0x7F, 0x7F, 0x7F, 0x3F, 0x3F, 0x1F, 0xF, 0x7, 0x3, 0x0, 0x0, 0x0, 0xC0,
+    0xE0, 0x60, 0x20, 0x20, 0x60, 0xE0, 0xE0, 0xE0, 0x0, 0x0, 0x80, 0xC0, 0xE0, 0x60, 0x20, 0x60,
+    0x60, 0xE0, 0xE0, 0xE0, 0x0, 0x0, 0x80, 0xC0, 0x60, 0x60, 0x20, 0x60, 0x60, 0xE0, 0xE0, 0x0,
+    0x0, 0x0, 0xE0, 0xE0, 0x0, 0x0, 0x0, 0xE0, 0xE0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x80, 0xE0,
+    0x60, 0x60, 0x60, 0x60, 0xE0, 0x80, 0x0, 0x0, 0x0, 0xE0, 0xE0, 0x0, 0x0, 0x0, 0xE0, 0xE0,
+    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+
+    0x0, 0x0, 0x0, 0x3, 0x7, 0x1F, 0x9F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFD, 0xF1, 0xE3,
+    0xE3, 0xCF, 0xFF, 0xFF, 0xFF, 0xFF, 0xF0, 0xFC, 0x7F, 0x3F, 0x3F, 0x3F, 0x3F, 0x7F, 0xFF, 0xFF,
+    0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFE, 0xFC, 0xF0, 0xE0, 0x80, 0x0, 0x0, 0x0, 0xC,
+    0x1C, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x7F, 0x7F, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x7, 0x7, 0x0,
+    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x1C, 0xC, 0x0, 0x0, 0x0, 0x0, 0x0,
+    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+
+    0x0, 0x7, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFE, 0xFE, 0xFE, 0xFE, 0xFC, 0xF8,
+    0xF8, 0xF0, 0xFE, 0xFF, 0xFF, 0xFF, 0x7F, 0x3F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x1F,
+    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xFF,
+    0xFF, 0x0, 0x0, 0x0, 0xFF, 0xFF, 0xE0, 0xC0, 0xC0, 0xC0, 0xFF, 0x7F, 0x0, 0x0, 0x1E, 0x7F,
+    0xE1, 0xC0, 0xC0, 0xC0, 0xC0, 0x61, 0xFF, 0xFF, 0x0, 0x0, 0xFE, 0xFF, 0x1, 0x0, 0x0, 0x0,
+    0xFF, 0xFF, 0x0, 0x0, 0x21, 0xF9, 0xF8, 0xDC, 0xCC, 0xCF, 0x7, 0x0, 0xC0, 0xFF, 0xFF, 0xC0,
+    0x80, 0x0, 0xFF, 0xFF, 0xC0, 0xC0, 0x80, 0x0, 0x0, 0xFF, 0xFF, 0x0, 0x0, 0x1F, 0x7F, 0xF9,
+    0xC8, 0xC8, 0xC8, 0xC8, 0x79, 0x39, 0x0, 0x0, 0x71, 0xF9, 0xD8, 0xCC, 0xCE, 0x47, 0x3, 0x0,
+
+    0x0, 0x0, 0x0, 0x0, 0x80, 0x80, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+    0x0, 0x0, 0x0, 0x80, 0xC0, 0xE0, 0xF0, 0xF8, 0xF8, 0xFC, 0xFC, 0xFC, 0xFC, 0xF8, 0xF0, 0xC0,
+    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xC0,
+    0xC0, 0x0, 0x0, 0x0, 0xC0, 0xC0, 0x0, 0x0, 0x0, 0x0, 0xC0, 0xC0, 0x0, 0x0, 0x0, 0x80,
+    0xC0, 0xC0, 0xC0, 0xC0, 0xC0, 0x80, 0xC0, 0xC0, 0x0, 0x0, 0x0, 0x80, 0xC0, 0xC0, 0xC0, 0xC0,
+    0xC0, 0x80, 0x0, 0x0, 0x80, 0xC0, 0xC0, 0xC0, 0xC0, 0xC0, 0x0, 0x0, 0x0, 0xC0, 0xC0, 0x0,
+    0x0, 0x0, 0xC0, 0x80, 0x0, 0x0, 0x0, 0x0, 0x0, 0xC0, 0xC0, 0x0, 0x0, 0x0, 0x80, 0xC0,
+    0xC0, 0xC0, 0xC0, 0xC0, 0x80, 0x80, 0x0, 0x0, 0x80, 0xC0, 0xC0, 0xC0, 0xC0, 0x80, 0x0, 0x0,
+
+    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+    0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+};
+
+
+
+
+// reduces how much is refreshed, which speeds it up!
+// originally derived from Steve Evans/JCW's mod but cleaned up and
+// optimized
+#define enablePartialUpdate
+
+#ifdef enablePartialUpdate
+static uint8_t xUpdateMin, xUpdateMax, yUpdateMin, yUpdateMax;
+#endif
+
+
+
+static void updateBoundingBox(uint8_t xmin, uint8_t ymin, uint8_t xmax, uint8_t ymax)
+{
+#ifdef enablePartialUpdate
+    if (xmin < xUpdateMin) xUpdateMin = xmin;
+    if (xmax > xUpdateMax) xUpdateMax = xmax;
+    if (ymin < yUpdateMin) yUpdateMin = ymin;
+    if (ymax > yUpdateMax) yUpdateMax = ymax;
+#endif
+}
+
+/*
+void ST7565::drawbitmap(uint8_t x, uint8_t y,
+            const uint8_t *bitmap, uint8_t w, uint8_t h,
+            uint8_t color) {
+  for (uint8_t i=0; i<h; i++) {
+    for (uint8_t j=0; j<w; j++ ) {
+      if (pgm_read_byte(bitmap + j + (j/8)*w) & _BV(j%8)) {
+    my_setpixel(x+j, y+i, color);
+      }
+    }
+  }
+
+  updateBoundingBox(x, y, x+w, y+h);
+}
+*/
+
+void ST7565::drawstring(uint8_t x, uint8_t line, char *c)
+{
+    while (*c != '\0') {
+        drawchar(x, line, *c);
+        *c++;
+        x += 6; // 6 pixels wide
+        if (x + 6 >= LCDWIDTH) {
+            x = 0;    // ran out of this line
+            line++;
+        }
+        if (line >= (LCDHEIGHT/8))
+            return;        // ran out of space :(
+    }
+}
+
+
+void  ST7565::drawchar(uint8_t x, uint8_t line, char c)
+{
+    for (uint8_t i =0; i<5; i++ ) {
+        *(st7565_buffer + x + line*128) = *(font + (c*5) + i);
+        x++;
+    }
+    updateBoundingBox(x, line*8, x+5, line*8+8);    //only updates relevant area of LCD
+}
+
+
+// bresenham's algorithm - thx wikpedia
+void ST7565::drawline(uint8_t x0, uint8_t y0, uint8_t x1, uint8_t y1,
+                      uint8_t color)
+{
+    uint8_t steep = abs(y1 - y0) > abs(x1 - x0);
+    if (steep) {
+        swap(x0, y0);
+        swap(x1, y1);
+    }
+
+    if (x0 > x1) {
+        swap(x0, x1);
+        swap(y0, y1);
+    }
+
+    // much faster to put the test here, since we've already sorted the points
+    updateBoundingBox(x0, y0, x1, y1);
+
+    uint8_t dx, dy;
+    dx = x1 - x0;
+    dy = abs(y1 - y0);
+
+    int8_t err = dx / 2;
+    int8_t ystep;
+
+    if (y0 < y1) {
+        ystep = 1;
+    } else {
+        ystep = -1;
+    }
+
+    for (; x0<=x1; x0++) {
+        if (steep) {
+            my_setpixel(y0, x0, color);
+        } else {
+            my_setpixel(x0, y0, color);
+        }
+        err -= dy;
+        if (err < 0) {
+            y0 += ystep;
+            err += dx;
+        }
+    }
+}
+
+// filled rectangle
+void ST7565::fillrect(uint8_t x, uint8_t y, uint8_t w, uint8_t h,
+                      uint8_t color)
+{
+
+    // stupidest version - just pixels - but fast with internal buffer!
+    for (uint8_t i=x; i<x+w; i++) {
+        for (uint8_t j=y; j<y+h; j++) {
+            my_setpixel(i, j, color);
+        }
+    }
+
+    updateBoundingBox(x, y, x+w, y+h);
+}
+
+// draw a rectangle
+void ST7565::drawrect(uint8_t x, uint8_t y, uint8_t w, uint8_t h,
+                      uint8_t color)
+{
+    // stupidest version - just pixels - but fast with internal buffer!
+    for (uint8_t i=x; i<x+w; i++) {
+        my_setpixel(i, y, color);
+        my_setpixel(i, y+h-1, color);
+    }
+    for (uint8_t i=y; i<y+h; i++) {
+        my_setpixel(x, i, color);
+        my_setpixel(x+w-1, i, color);
+    }
+
+    updateBoundingBox(x, y, x+w, y+h);
+}
+
+// draw a circle outline
+void ST7565::drawcircle(uint8_t x0, uint8_t y0, uint8_t r,
+                        uint8_t color)
+{
+    updateBoundingBox(x0-r, y0-r, x0+r, y0+r);
+
+    int8_t f = 1 - r;
+    int8_t ddF_x = 1;
+    int8_t ddF_y = -2 * r;
+    int8_t x = 0;
+    int8_t y = r;
+
+    my_setpixel(x0, y0+r, color);
+    my_setpixel(x0, y0-r, color);
+    my_setpixel(x0+r, y0, color);
+    my_setpixel(x0-r, y0, color);
+
+    while (x<y) {
+        if (f >= 0) {
+            y--;
+            ddF_y += 2;
+            f += ddF_y;
+        }
+        x++;
+        ddF_x += 2;
+        f += ddF_x;
+
+        my_setpixel(x0 + x, y0 + y, color);
+        my_setpixel(x0 - x, y0 + y, color);
+        my_setpixel(x0 + x, y0 - y, color);
+        my_setpixel(x0 - x, y0 - y, color);
+
+        my_setpixel(x0 + y, y0 + x, color);
+        my_setpixel(x0 - y, y0 + x, color);
+        my_setpixel(x0 + y, y0 - x, color);
+        my_setpixel(x0 - y, y0 - x, color);
+
+    }
+}
+
+void ST7565::fillcircle(uint8_t x0, uint8_t y0, uint8_t r,
+                        uint8_t color)
+{
+    updateBoundingBox(x0-r, y0-r, x0+r, y0+r);
+
+    int8_t f = 1 - r;
+    int8_t ddF_x = 1;
+    int8_t ddF_y = -2 * r;
+    int8_t x = 0;
+    int8_t y = r;
+
+    for (uint8_t i=y0-r; i<=y0+r; i++) {
+        my_setpixel(x0, i, color);
+    }
+
+    while (x<y) {
+        if (f >= 0) {
+            y--;
+            ddF_y += 2;
+            f += ddF_y;
+        }
+        x++;
+        ddF_x += 2;
+        f += ddF_x;
+
+        for (uint8_t i=y0-y; i<=y0+y; i++) {
+            my_setpixel(x0+x, i, color);
+            my_setpixel(x0-x, i, color);
+        }
+        for (uint8_t i=y0-x; i<=y0+x; i++) {
+            my_setpixel(x0+y, i, color);
+            my_setpixel(x0-y, i, color);
+        }
+    }
+}
+
+void ST7565::my_setpixel(uint8_t x, uint8_t y, uint8_t color)
+{
+    if ((x >= LCDWIDTH) || (y >= LCDHEIGHT))
+        return;
+
+    // x is which column
+    if (color)
+        st7565_buffer[x+ (y/8)*128] |= _BV(7-(y%8));
+    else
+        st7565_buffer[x+ (y/8)*128] &= _nBV(7-(y%8));
+}
+
+// the most basic function, set a single pixel
+void ST7565::setpixel(uint8_t x, uint8_t y, uint8_t color)
+{
+    if ((x >= LCDWIDTH) || (y >= LCDHEIGHT))
+        return;
+    // x is which column
+    if (color)
+        st7565_buffer[x+ (y/8)*128] |= _BV(7-(y%8));
+    else
+        st7565_buffer[x+ (y/8)*128] &= _nBV(7-(y%8));
+
+    updateBoundingBox(x,y,x,y);
+}
+
+
+// the most basic function, get a single pixel
+uint8_t ST7565::getpixel(uint8_t x, uint8_t y)
+{
+    if ((x >= LCDWIDTH) || (y >= LCDHEIGHT))
+        return 0;
+
+    return (st7565_buffer[x+ (y/8)*128] >> (7-(y%8))) & 0x1;
+}
+
+
+ST7565::ST7565(PinName mosi, PinName sclk, PinName cs, PinName rst, PinName a0)
+// set pin directions
+    : _spi(mosi, NC, sclk), _cs(cs), _rst(rst), _a0(a0)
+
+{
+    _spi.format(8, 0);
+    _spi.frequency(1000000);
+}
+
+
+
+void ST7565::st7565_init(void)
+{
+    wait_ms(100); 
+    _rst = 0;
+    wait_ms(100);
+    _rst = 1;
+    
+
+    // LCD bias select
+    st7565_command(CMD_SET_BIAS_7);
+    // ADC select
+    st7565_command(CMD_SET_ADC_NORMAL);
+    // SHL select
+    st7565_command(CMD_SET_COM_NORMAL);
+
+    // turn on voltage converter (VC=1, VR=0, VF=0)
+    st7565_command(CMD_SET_POWER_CONTROL | 0x4);
+    // wait for 50% rising
+    wait_ms(50);
+
+    // turn on voltage regulator (VC=1, VR=1, VF=0)
+    st7565_command(CMD_SET_POWER_CONTROL | 0x6);
+    // wait >=50ms
+    wait_ms(20);
+
+    // turn on voltage follower (VC=1, VR=1, VF=1)
+    st7565_command(CMD_SET_POWER_CONTROL | 0x7);
+    // wait
+    wait_ms(10);
+    
+    // set lcd operating voltage (regulator resistor, ref voltage resistor)
+    st7565_command(CMD_SET_RESISTOR_RATIO | 0x4);
+    wait_ms(10);
+
+
+//    st7565_set_brightness(INITIAL_CONTRAST);
+    // set up a bounding box for screen updates
+    updateBoundingBox(0, 0, LCDWIDTH-1, LCDHEIGHT-1);
+
+
+    st7565_command(CMD_DISPLAY_ON);
+    st7565_command(CMD_SET_ALLPTS_NORMAL);
+    
+    
+    // reference voltage resistor    
+    st7565_command(CMD_SET_VOLUME_FIRST);
+    wait_ms(10);
+    st7565_command(CMD_SET_VOLUME_SECOND);
+    wait_ms(10);
+
+
+
+    // Initial display line ( = 0)
+    st7565_command(CMD_SET_DISP_START_LINE);
+    // Initial page address ( = 0)
+    st7565_command(CMD_SET_PAGE);    
+    st7565_command(CMD_SET_COLUMN_UPPER);
+    st7565_command(CMD_SET_COLUMN_LOWER);
+    
+}
+
+inline void ST7565::spiwrite(uint8_t c)
+{
+    _spi.write(c);
+}
+
+void ST7565::st7565_command(uint8_t c)
+{
+    _cs = 0;
+    _a0 = 0;
+    _spi.write(c);
+    _cs = 1;
+}
+
+void ST7565::st7565_data(uint8_t c)
+{
+    _cs = 0;
+    _a0 = 1;
+    _spi.write(c);
+    _cs = 1;
+}
+
+void ST7565::st7565_set_brightness(uint8_t val)
+{
+    st7565_command(CMD_SET_VOLUME_FIRST);
+    st7565_command(CMD_SET_VOLUME_SECOND | (val & 0x3f));
+}
+
+void ST7565::begin(uint8_t contrast){
+    st7565_init();
+  st7565_command(CMD_DISPLAY_ON);
+  st7565_command(CMD_SET_ALLPTS_NORMAL);
+  st7565_set_brightness(contrast);
+}
+    
+
+void ST7565::display(void)
+{
+    uint8_t col, maxcol, p;
+
+    for(p = 0; p < 8; p++) {
+#ifdef enablePartialUpdate
+        // check if this page is part of update
+        if ( yUpdateMin >= ((p+1)*8) ) {
+            continue;   // nope, skip it!
+        }
+        if (yUpdateMax < p*8) {
+            break;
+        }
+#endif
+        st7565_command(CMD_SET_PAGE | pagemap[p]);
+
+#ifdef enablePartialUpdate
+        col = xUpdateMin;
+        maxcol = xUpdateMax;
+#else
+        // start at the beginning of the row
+        col = 0;
+        maxcol = LCDWIDTH-1;
+#endif
+
+        st7565_command(CMD_SET_COLUMN_LOWER | ((col+ST7565_STARTBYTES) & 0xf));
+        st7565_command(CMD_SET_COLUMN_UPPER | (((col+ST7565_STARTBYTES) >> 4) & 0x0F));
+        st7565_command(CMD_RMW);
+
+        for(; col <= maxcol; col++) {
+            st7565_data(st7565_buffer[(128*p)+col]);
+        }
+    }
+
+#ifdef enablePartialUpdate
+    xUpdateMin = LCDWIDTH - 1;
+    xUpdateMax = 0;
+    yUpdateMin = LCDHEIGHT-1;
+    yUpdateMax = 0;
+#endif
+}
+
+// clear everything
+void ST7565::clear(void)
+{
+    memset(st7565_buffer, 0, 1024);
+    updateBoundingBox(0, 0, LCDWIDTH-1, LCDHEIGHT-1);
+}
+
+
+// this doesnt touch the buffer, just clears the display RAM - might be handy
+void ST7565::clear_display(void)
+{
+    uint8_t p, c;
+
+    for(p = 0; p < 8; p++) {
+
+        st7565_command(CMD_SET_PAGE | p);
+        for(c = 0; c < 129; c++) {
+            st7565_command(CMD_SET_COLUMN_LOWER | (c & 0xf));
+            st7565_command(CMD_SET_COLUMN_UPPER | ((c >> 4) & 0xf));
+            st7565_data(0x0);
+        }
+    }
+}
+
+//additional function to set a bit
+uint8_t ST7565::_BV(uint8_t bit)
+{
+    return 1 << bit;
+}
+
+uint8_t ST7565::_nBV(uint8_t bit)
+{
+    return 0 << bit;
+}
\ No newline at end of file