mirror of
https://github.com/digistump/DigistumpArduino.git
synced 2025-04-28 07:39:02 -07:00
317 lines
7.9 KiB
C++
317 lines
7.9 KiB
C++
/*
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* PCD8544 - Interface with Philips PCD8544 (or compatible) LCDs.
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*
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* Copyright (c) 2010 Carlos Rodrigues <cefrodrigues@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "PCD8544.h"
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#include <Arduino.h>
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#include <avr/pgmspace.h>
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extern const PROGMEM unsigned char font5x8[][5];
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/*
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* If this was a ".h", it would get added to sketches when using
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* the "Sketch -> Import Library..." menu on the Arduino IDE...
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*/
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PCD8544::PCD8544(unsigned char sclk, unsigned char sdin,
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unsigned char dc, unsigned char reset,
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unsigned char sce):
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pin_sclk(sclk),
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pin_sdin(sdin),
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pin_dc(dc),
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pin_reset(reset),
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pin_sce(sce)
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{}
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void PCD8544::begin(unsigned char model)
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{
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this->column = 0;
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this->line = 0;
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// Sanitize the custom glyphs...
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memset(this->custom, 0, sizeof(this->custom));
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// All pins are outputs (these displays cannot be read)...
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pinMode(this->pin_sclk, OUTPUT);
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pinMode(this->pin_sdin, OUTPUT);
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pinMode(this->pin_dc, OUTPUT);
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pinMode(this->pin_reset, OUTPUT);
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pinMode(this->pin_sce, OUTPUT);
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// Reset the controller state...
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digitalWrite(this->pin_reset, HIGH);
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digitalWrite(this->pin_sce, HIGH);
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digitalWrite(this->pin_reset, LOW);
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delay(100);
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digitalWrite(this->pin_reset, HIGH);
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// Set the LCD parameters...
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this->send(PCD8544_CMD, 0x21); // extended instruction set control (H=1)
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this->send(PCD8544_CMD, 0x13); // bias system (1:48)
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if (model == CHIP_ST7576) {
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this->send(PCD8544_CMD, 0xe0); // higher Vop, too faint at default
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this->send(PCD8544_CMD, 0x05); // partial display mode
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} else {
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this->send(PCD8544_CMD, 0xc2); // default Vop (3.06 + 66 * 0.06 = 7V)
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}
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this->send(PCD8544_CMD, 0x20); // extended instruction set control (H=0)
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this->send(PCD8544_CMD, 0x09); // all display segments on
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// Clear RAM contents...
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this->clear();
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// Activate LCD...
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this->send(PCD8544_CMD, 0x08); // display blank
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this->send(PCD8544_CMD, 0x0c); // normal mode (0x0d = inverse mode)
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delay(100);
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// Place the cursor at the origin...
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this->send(PCD8544_CMD, 0x80);
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this->send(PCD8544_CMD, 0x40);
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}
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void PCD8544::stop()
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{
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this->clear();
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this->setPower(false);
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}
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void PCD8544::clear()
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{
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this->setCursor(0, 0);
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for (unsigned short i = 0; i < PCD8544_WIDTH * (PCD8544_HEIGHT/8); i++) {
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this->send(PCD8544_DATA, 0x00);
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}
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this->setCursor(0, 0);
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}
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void PCD8544::clearLine()
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{
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this->setCursor(0, this->line);
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for (unsigned char i = 0; i < PCD8544_WIDTH; i++) {
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this->send(PCD8544_DATA, 0x00);
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}
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this->setCursor(0, this->line);
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}
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void PCD8544::setPower(bool on)
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{
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this->send(PCD8544_CMD, on ? 0x20 : 0x24);
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}
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inline void PCD8544::display()
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{
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this->setPower(true);
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}
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inline void PCD8544::noDisplay()
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{
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this->setPower(false);
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}
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void PCD8544::setInverse(bool inverse)
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{
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this->send(PCD8544_CMD, inverse ? 0x0d : 0x0c);
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}
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void PCD8544::home()
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{
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this->setCursor(0, this->line);
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}
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void PCD8544::setCursor(unsigned char column, unsigned char line)
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{
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if (column > PCD8544_WIDTH) {
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column = 0;
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line++;
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}
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if (line > PCD8544_HEIGHT / 8)
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line = 0;
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this->column = column;
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this->line = line;
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this->send(PCD8544_CMD, 0x80 | column);
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this->send(PCD8544_CMD, 0x40 | line);
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}
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void PCD8544::createChar(unsigned char chr, const unsigned char *glyph)
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{
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// ASCII 0-31 only...
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if (chr >= ' ') {
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return;
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}
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this->custom[chr] = glyph;
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}
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size_t PCD8544::write(uint8_t chr)
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{
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// ASCII 7-bit only...
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if (chr >= 0x7f) {
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return 0;
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}
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if (chr == '\n') {
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column = 0;
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line = (line + 1) % (PCD8544_HEIGHT/9 + 1);
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return 0;
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} else if (chr == '\r') {
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column = 0;
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return 0;
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}
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const unsigned char *glyph;
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unsigned char pgm_buffer[5];
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if (chr >= ' ') {
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// Regular ASCII characters are kept in flash to save RAM...
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memcpy_P(pgm_buffer, &font5x8[chr - ' '], sizeof(pgm_buffer));
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glyph = pgm_buffer;
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} else {
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// Custom glyphs, on the other hand, are stored in RAM...
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if (custom[chr]) {
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glyph = custom[chr];
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} else {
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// Default to a space character if unset...
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memcpy_P(pgm_buffer, &font5x8[0], sizeof(pgm_buffer));
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glyph = pgm_buffer;
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}
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}
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// Output one column at a time...
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for (unsigned char i = 0; i < 5; i++) {
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this->send(PCD8544_DATA, glyph[i]);
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}
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// One column between characters...
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this->send(PCD8544_DATA, 0x00);
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// Update the cursor position...
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this->column = (this->column + 6) % PCD8544_WIDTH;
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if (this->column == 0) {
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this->line = (this->line + 1) % (PCD8544_HEIGHT/9 + 1);
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}
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#if ARDUINO >= 100
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return 1;
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#endif
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}
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void PCD8544::draw8x8(const unsigned char *data)
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{
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// Output one column at a time...
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for (unsigned char i = 0; i < 8; i++) {
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this->send(PCD8544_DATA, data[i]);
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}
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this->setCursor(column + 8, line);
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}
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void PCD8544::draw16x16(const unsigned char *data)
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{
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unsigned char scolumn = this->column;
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unsigned char sline = this->line;
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// Output one column at a time...
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for (unsigned char i = 0; i < 16; i++) {
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this->send(PCD8544_DATA, data[i]);
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}
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this->setCursor(scolumn, sline + 1);
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for (unsigned char i = 0; i < 16; i++) {
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this->send(PCD8544_DATA, data[i + 16]);
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}
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// Update the cursor position...
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this->setCursor(scolumn + 16, sline);
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}
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void PCD8544::drawColumn(unsigned char lines, unsigned char value)
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{
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unsigned char scolumn = this->column;
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unsigned char sline = this->line;
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// Keep "value" within range...
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if (value > lines*8) {
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value = lines*8;
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}
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// Find the line where "value" resides...
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unsigned char mark = (lines*8 - 1 - value)/8;
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// Clear the lines above the mark...
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for (unsigned char line = 0; line < mark; line++) {
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this->setCursor(scolumn, sline + line);
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this->send(PCD8544_DATA, 0x00);
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}
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// Compute the byte to draw at the "mark" line...
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unsigned char b = 0xff;
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for (unsigned char i = 0; i < lines*8 - mark*8 - value; i++) {
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b <<= 1;
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}
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this->setCursor(scolumn, sline + mark);
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this->send(PCD8544_DATA, b);
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// Fill the lines below the mark...
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for (unsigned char line = mark + 1; line < lines; line++) {
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this->setCursor(scolumn, sline + line);
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this->send(PCD8544_DATA, 0xff);
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}
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// Leave the cursor in a consistent position...
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this->setCursor(scolumn + 1, sline);
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}
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void PCD8544::send(unsigned char type, unsigned char data)
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{
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digitalWrite(this->pin_dc, type);
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digitalWrite(this->pin_sce, LOW);
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shiftOut(this->pin_sdin, this->pin_sclk, MSBFIRST, data);
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digitalWrite(this->pin_sce, HIGH);
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}
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/* vim: set expandtab ts=4 sw=4: */
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