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diff --git a/nanotimer/PCD8544.cpp b/nanotimer/PCD8544.cpp
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+/*
+ * PCD8544 - Interface with Philips PCD8544 (or compatible) LCDs.
+ *
+ * Copyright (c) 2010 Carlos Rodrigues <cefrodrigues@gmail.com>
+ *
+ * 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.
+ */
+
+
+#include "PCD8544.h"
+
+#include <Arduino.h>
+#include <avr/pgmspace.h>
+
+extern const PROGMEM unsigned char font5x8[][5];
+
+/*
+ * If this was a ".h", it would get added to sketches when using
+ * the "Sketch -> Import Library..." menu on the Arduino IDE...
+ */
+
+PCD8544::PCD8544(unsigned char sclk, unsigned char sdin,
+ unsigned char dc, unsigned char reset,
+ unsigned char sce):
+ pin_sclk(sclk),
+ pin_sdin(sdin),
+ pin_dc(dc),
+ pin_reset(reset),
+ pin_sce(sce)
+{}
+
+
+void PCD8544::begin(unsigned char model)
+{
+ this->column = 0;
+ this->line = 0;
+
+ // Sanitize the custom glyphs...
+ memset(this->custom, 0, sizeof(this->custom));
+
+ // All pins are outputs (these displays cannot be read)...
+ pinMode(this->pin_sclk, OUTPUT);
+ pinMode(this->pin_sdin, OUTPUT);
+ pinMode(this->pin_dc, OUTPUT);
+ pinMode(this->pin_reset, OUTPUT);
+ pinMode(this->pin_sce, OUTPUT);
+
+ // Reset the controller state...
+ digitalWrite(this->pin_reset, HIGH);
+ digitalWrite(this->pin_sce, HIGH);
+ digitalWrite(this->pin_reset, LOW);
+ delay(100);
+ digitalWrite(this->pin_reset, HIGH);
+
+ // Set the LCD parameters...
+ this->send(PCD8544_CMD, 0x21); // extended instruction set control (H=1)
+ this->send(PCD8544_CMD, 0x13); // bias system (1:48)
+
+ if (model == CHIP_ST7576) {
+ this->send(PCD8544_CMD, 0xe0); // higher Vop, too faint at default
+ this->send(PCD8544_CMD, 0x05); // partial display mode
+ } else {
+ this->send(PCD8544_CMD, 0xc2); // default Vop (3.06 + 66 * 0.06 = 7V)
+ }
+
+ this->send(PCD8544_CMD, 0x20); // extended instruction set control (H=0)
+ this->send(PCD8544_CMD, 0x09); // all display segments on
+
+ // Clear RAM contents...
+ this->clear();
+
+ // Activate LCD...
+ this->send(PCD8544_CMD, 0x08); // display blank
+ this->send(PCD8544_CMD, 0x0c); // normal mode (0x0d = inverse mode)
+ delay(100);
+
+ // Place the cursor at the origin...
+ this->send(PCD8544_CMD, 0x80);
+ this->send(PCD8544_CMD, 0x40);
+}
+
+
+void PCD8544::stop()
+{
+ this->clear();
+ this->setPower(false);
+}
+
+
+void PCD8544::clear()
+{
+ this->setCursor(0, 0);
+
+ for (unsigned short i = 0; i < PCD8544_WIDTH * (PCD8544_HEIGHT/8); i++) {
+ this->send(PCD8544_DATA, 0x00);
+ }
+
+ this->setCursor(0, 0);
+}
+
+
+void PCD8544::clearLine()
+{
+ this->setCursor(0, this->line);
+
+ for (unsigned char i = 0; i < PCD8544_WIDTH; i++) {
+ this->send(PCD8544_DATA, 0x00);
+ }
+
+ this->setCursor(0, this->line);
+}
+
+
+void PCD8544::setPower(bool on)
+{
+ this->send(PCD8544_CMD, on ? 0x20 : 0x24);
+}
+
+
+inline void PCD8544::display()
+{
+ this->setPower(true);
+}
+
+
+inline void PCD8544::noDisplay()
+{
+ this->setPower(false);
+}
+
+
+void PCD8544::setInverse(bool inverse)
+{
+ this->send(PCD8544_CMD, inverse ? 0x0d : 0x0c);
+}
+
+
+void PCD8544::home()
+{
+ this->setCursor(0, this->line);
+}
+
+
+void PCD8544::setCursor(unsigned char column, unsigned char line)
+{
+ if (column > PCD8544_WIDTH) {
+ column = 0;
+ line++;
+ }
+ if (line > PCD8544_HEIGHT / 8)
+ line = 0;
+
+ this->column = column;
+ this->line = line;
+
+ this->send(PCD8544_CMD, 0x80 | column);
+ this->send(PCD8544_CMD, 0x40 | line);
+}
+
+
+void PCD8544::createChar(unsigned char chr, const unsigned char *glyph)
+{
+ // ASCII 0-31 only...
+ if (chr >= ' ') {
+ return;
+ }
+
+ this->custom[chr] = glyph;
+}
+
+
+size_t PCD8544::write(uint8_t chr)
+{
+ // ASCII 7-bit only...
+ if (chr >= 0x7f) {
+ return 0;
+ }
+
+ if (chr == '\n') {
+ column = 0;
+ line = (line + 1) % (PCD8544_HEIGHT/9 + 1);
+ return 0;
+ } else if (chr == '\r') {
+ column = 0;
+ return 0;
+ }
+
+ const unsigned char *glyph;
+ unsigned char pgm_buffer[5];
+
+ if (chr >= ' ') {
+ // Regular ASCII characters are kept in flash to save RAM...
+ memcpy_P(pgm_buffer, &font5x8[chr - ' '], sizeof(pgm_buffer));
+ glyph = pgm_buffer;
+ } else {
+ // Custom glyphs, on the other hand, are stored in RAM...
+ if (custom[chr]) {
+ glyph = custom[chr];
+ } else {
+ // Default to a space character if unset...
+ memcpy_P(pgm_buffer, &font5x8[0], sizeof(pgm_buffer));
+ glyph = pgm_buffer;
+ }
+ }
+
+ // Output one column at a time...
+ for (unsigned char i = 0; i < 5; i++) {
+ this->send(PCD8544_DATA, glyph[i]);
+ }
+
+ // One column between characters...
+ this->send(PCD8544_DATA, 0x00);
+
+ // Update the cursor position...
+ this->column = (this->column + 6) % PCD8544_WIDTH;
+
+ if (this->column == 0) {
+ this->line = (this->line + 1) % (PCD8544_HEIGHT/9 + 1);
+ }
+
+#if ARDUINO >= 100
+ return 1;
+#endif
+}
+
+void PCD8544::draw8x8(const unsigned char *data)
+{
+ // Output one column at a time...
+ for (unsigned char i = 0; i < 8; i++) {
+ this->send(PCD8544_DATA, data[i]);
+ }
+ this->setCursor(column + 8, line);
+}
+
+void PCD8544::draw16x16(const unsigned char *data)
+{
+ unsigned char scolumn = this->column;
+ unsigned char sline = this->line;
+ // Output one column at a time...
+ for (unsigned char i = 0; i < 16; i++) {
+ this->send(PCD8544_DATA, data[i]);
+ }
+ this->setCursor(scolumn, sline + 1);
+ for (unsigned char i = 0; i < 16; i++) {
+ this->send(PCD8544_DATA, data[i + 16]);
+ }
+ // Update the cursor position...
+ this->setCursor(scolumn + 16, sline);
+}
+
+void PCD8544::drawColumn(unsigned char lines, unsigned char value)
+{
+ unsigned char scolumn = this->column;
+ unsigned char sline = this->line;
+
+ // Keep "value" within range...
+ if (value > lines*8) {
+ value = lines*8;
+ }
+
+ // Find the line where "value" resides...
+ unsigned char mark = (lines*8 - 1 - value)/8;
+
+ // Clear the lines above the mark...
+ for (unsigned char line = 0; line < mark; line++) {
+ this->setCursor(scolumn, sline + line);
+ this->send(PCD8544_DATA, 0x00);
+ }
+
+ // Compute the byte to draw at the "mark" line...
+ unsigned char b = 0xff;
+ for (unsigned char i = 0; i < lines*8 - mark*8 - value; i++) {
+ b <<= 1;
+ }
+
+ this->setCursor(scolumn, sline + mark);
+ this->send(PCD8544_DATA, b);
+
+ // Fill the lines below the mark...
+ for (unsigned char line = mark + 1; line < lines; line++) {
+ this->setCursor(scolumn, sline + line);
+ this->send(PCD8544_DATA, 0xff);
+ }
+
+ // Leave the cursor in a consistent position...
+ this->setCursor(scolumn + 1, sline);
+}
+
+
+void PCD8544::send(unsigned char type, unsigned char data)
+{
+ digitalWrite(this->pin_dc, type);
+
+ digitalWrite(this->pin_sce, LOW);
+ shiftOut(this->pin_sdin, this->pin_sclk, MSBFIRST, data);
+ digitalWrite(this->pin_sce, HIGH);
+}
+
+
+/* vim: set expandtab ts=4 sw=4: */
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