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LiquidCrystal.c
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LiquidCrystal.c
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#include "LiquidCrystal.h"
// I just removed this:
// #include <stdio.h>
// Defines size_t:
#include <string.h>
#include <inttypes.h>
#include "io.h" // Quark IO
// When the display powers up, it is configured as follows:
//
// 1. Display clear
// 2. Function set:
// DL = 1; 8-bit interface data
// N = 0; 1-line display
// F = 0; 5x8 dot character font
// 3. Display on/off control:
// D = 0; Display off
// C = 0; Cursor off
// B = 0; Blinking off
// 4. Entry mode set:
// I/D = 1; Increment by 1
// S = 0; No shift
//
// Note: Resetting the Quark doesn't reset the LCD, so we
// can't assume this state when our program starts.
// Arduino constructors - not implemented here:
/*
LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable,
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7)
{
init(0, rs, rw, enable, d0, d1, d2, d3, d4, d5, d6, d7);
}
LiquidCrystal(uint8_t rs, uint8_t enable,
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7)
{
init(0, rs, 255, enable, d0, d1, d2, d3, d4, d5, d6, d7);
}
LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable,
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3)
{
init(1, rs, rw, enable, d0, d1, d2, d3, 0, 0, 0, 0);
}
*/
// Set up 4-bit data mode:
void LiquidCrystal(uint8_t rs, uint8_t enable,
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3)
{
init(1, rs, 255, enable, d0, d1, d2, d3, 0, 0, 0, 0);
}
void begin(uint8_t cols, uint8_t lines, uint8_t dotsize) {
if (lines > 1) {
_displayfunction |= LCD_2LINE;
}
_numlines = lines;
setRowOffsets(0x00, 0x40, 0x00 + cols, 0x40 + cols);
// for some 1 line displays you can select a 10 pixel high font
if ((dotsize != LCD_5x8DOTS) && (lines == 1)) {
_displayfunction |= LCD_5x10DOTS;
}
// SEE PAGE 45/46 FOR INITIALIZATION SPECIFICATION!
// according to datasheet, we need at least 40ms after power rises above 2.7V
// before sending commands.
delayMicroseconds(50000);
// Now we pull RS low to begin commands
digitalWrite(_rs_pin, LOW);
digitalWrite(_enable_pin, LOW);
//put the LCD into 4 bit or 8 bit mode
if (! (_displayfunction & LCD_8BITMODE)) {
// this is according to the hitachi HD44780 datasheet
// figure 24, pg 46
// we start in 8bit mode, try to set 4 bit mode
write4bits(0x03);
delayMicroseconds(4500); // wait min 4.1ms
// second try
write4bits(0x03);
delayMicroseconds(4500); // wait min 4.1ms
// third go!
write4bits(0x03);
delayMicroseconds(150);
// finally, set to 4-bit interface
write4bits(0x02);
} else {
// this is according to the hitachi HD44780 datasheet
// page 45 figure 23
// Send function set command sequence
command(LCD_FUNCTIONSET | _displayfunction);
delayMicroseconds(4500); // wait more than 4.1ms
// second try
command(LCD_FUNCTIONSET | _displayfunction);
delayMicroseconds(150);
// third go
command(LCD_FUNCTIONSET | _displayfunction);
}
// finally, set # lines, font size, etc.
command(LCD_FUNCTIONSET | _displayfunction);
// turn the display on with no cursor or blinking default
_displaycontrol = LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF;
display();
// Create custom characters:
createChars();
// clear it off
clear();
// Initialize to default text direction (for romance languages)
_displaymode = LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT;
// set the entry mode
command(LCD_ENTRYMODESET | _displaymode);
}
void init(uint8_t fourbitmode, uint8_t rs, uint8_t rw, uint8_t enable,
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7)
{
_rs_pin = rs;
_rw_pin = rw;
_enable_pin = enable;
_data_pins[0] = d0;
_data_pins[1] = d1;
_data_pins[2] = d2;
_data_pins[3] = d3;
_data_pins[4] = d4;
_data_pins[5] = d5;
_data_pins[6] = d6;
_data_pins[7] = d7;
if (fourbitmode)
_displayfunction = LCD_4BITMODE | LCD_1LINE | LCD_5x8DOTS;
else
_displayfunction = LCD_8BITMODE | LCD_1LINE | LCD_5x8DOTS;
begin(LCD_NUMBEROFCOLUMNS,LCD_NUMBEROFLINES,LCD_5x8DOTS);
}
void setRowOffsets(int row0, int row1, int row2, int row3)
{
_row_offsets[0] = row0;
_row_offsets[1] = row1;
_row_offsets[2] = row2;
_row_offsets[3] = row3;
}
/********** high level commands, for the user! */
void clear()
{
command(LCD_CLEARDISPLAY); // clear display, set cursor position to zero
delayMicroseconds(2000); // this command takes a long time!
}
void home()
{
command(LCD_RETURNHOME); // set cursor position to zero
delayMicroseconds(2000); // this command takes a long time!
}
void setCursor(uint8_t col, uint8_t row)
{
const size_t max_lines = sizeof(_row_offsets) / sizeof(*_row_offsets);
if ( row >= max_lines ) {
row = max_lines - 1; // we count rows starting w/0
}
if ( row >= _numlines ) {
row = _numlines - 1; // we count rows starting w/0
}
command(LCD_SETDDRAMADDR | (col + _row_offsets[row]));
}
// Turn the display on/off (quickly)
void noDisplay() {
_displaycontrol &= ~LCD_DISPLAYON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
void display() {
_displaycontrol |= LCD_DISPLAYON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
// Turns the underline cursor on/off
void noCursor() {
_displaycontrol &= ~LCD_CURSORON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
void cursor() {
_displaycontrol |= LCD_CURSORON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
// Turn on and off the blinking cursor
void noBlink() {
_displaycontrol &= ~LCD_BLINKON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
void blink() {
_displaycontrol |= LCD_BLINKON;
command(LCD_DISPLAYCONTROL | _displaycontrol);
}
// These commands scroll the display without changing the RAM
void scrollDisplayLeft(void) {
command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVELEFT);
}
void scrollDisplayRight(void) {
command(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVERIGHT);
}
// This is for text that flows Left to Right
void leftToRight(void) {
_displaymode |= LCD_ENTRYLEFT;
command(LCD_ENTRYMODESET | _displaymode);
}
// This is for text that flows Right to Left
void rightToLeft(void) {
_displaymode &= ~LCD_ENTRYLEFT;
command(LCD_ENTRYMODESET | _displaymode);
}
// This will 'right justify' text from the cursor
void autoscroll(void) {
_displaymode |= LCD_ENTRYSHIFTINCREMENT;
command(LCD_ENTRYMODESET | _displaymode);
}
// This will 'left justify' text from the cursor
void noAutoscroll(void) {
_displaymode &= ~LCD_ENTRYSHIFTINCREMENT;
command(LCD_ENTRYMODESET | _displaymode);
}
// Allows us to fill the first 8 CGRAM locations
// with custom characters
void createChar(uint8_t location, uint8_t charmap[]) {
location &= 0x7; // we only have 8 locations 0-7
command(LCD_SETCGRAMADDR | (location << 3));
for (int i=0; i<8; i++) {
//write(charmap[i]);
writelcd(charmap[i]);
}
}
/*********** mid level commands, for sending data/cmds */
inline void command(uint8_t value) {
send(value, LOW);
}
// Renamed write to writelcd due to naming conflict:
inline void writelcd(uint8_t value) {
send(value, HIGH);
}
/********** high level command, for the user! */
void printcharlcd(char value) {
switch(value) {
case 'Æ':
value = (uint8_t)0;
break;
case 'Ø':
value = (uint8_t)1;
break;
case 'Å':
value = (uint8_t)2;
break;
case 'æ':
value = (uint8_t)3;
break;
case 'ø':
value = (uint8_t)4;
break;
case 'å':
value = (uint8_t)5;
break;
case 'g':
value = (uint8_t)6;
break;
case '°':
value = (uint8_t)7;
break;
}
writelcd((uint8_t)value);
}
/************ low level data pushing commands **********/
// write either command or data, with automatic 4/8-bit selection
void send(uint8_t value, uint8_t mode) {
digitalWrite(_rs_pin, mode);
// if there is a RW pin indicated, set it low to Write
if (_rw_pin != 255) {
digitalWrite(_rw_pin, LOW);
}
if (_displayfunction & LCD_8BITMODE) {
write8bits(value);
} else {
write4bits(value>>4);
write4bits(value);
}
}
void pulseEnable(void) {
digitalWrite(_enable_pin, LOW);
delayMicroseconds(1);
digitalWrite(_enable_pin, HIGH);
delayMicroseconds(1); // enable pulse must be >450ns
digitalWrite(_enable_pin, LOW);
delayMicroseconds(100); // commands need > 37us to settle
}
void write4bits(uint8_t value) {
for (int i = 0; i < 4; i++) {
digitalWrite(_data_pins[i], (value >> i) & 0x01);
}
pulseEnable();
}
void write8bits(uint8_t value) {
for (int i = 0; i < 8; i++) {
digitalWrite(_data_pins[i], (value >> i) & 0x01);
}
pulseEnable();
}
// for printf:
int putcharlcd(int c)
{
printcharlcd((char)c);
return 0;
}
// Custom characters. Please modify to suit your own requirements
// You may find this site useful: https://omerk.github.io/lcdchargen/
void createChars()
{
uint8_t customChar0[8] = {
0b01111,
0b10100,
0b10100,
0b11111,
0b10100,
0b10100,
0b10111,
0b00000};
createChar(0, customChar0);
uint8_t customChar1[8] = {
0b01110,
0b10001,
0b10011,
0b10101,
0b11001,
0b10001,
0b01110,
0b00000};
createChar(1, customChar1);
uint8_t customChar2[8] = {
0b00100,
0b00000,
0b01110,
0b10001,
0b11111,
0b10001,
0b10001,
0b00000};
createChar(2, customChar2);
uint8_t customChar3[8] = {
0b00000,
0b00000,
0b11010,
0b00101,
0b01111,
0b10100,
0b11011,
0b00000};
createChar(3, customChar3);
uint8_t customChar4[8] = {
0b00000,
0b00000,
0b01110,
0b10011,
0b10101,
0b11001,
0b01110,
0b00000};
createChar(4, customChar4);
uint8_t customChar5[8] = {
0b00100,
0b00000,
0b01110,
0b00001,
0b01111,
0b10001,
0b01111,
0b00000};
createChar(5, customChar5);
uint8_t customChar6[8] = {
0b00000,
0b00000,
0b01110,
0b10001,
0b11111,
0b00001,
0b01110,
0b00000};
createChar(6, customChar6);
uint8_t customChar7[8] = {
0b01100,
0b10010,
0b10010,
0b01100,
0b00000,
0b00000,
0b00000,
0b00000
};
createChar(7, customChar7);
}