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129 lines
3.3 KiB
C++
Executable File
129 lines
3.3 KiB
C++
Executable File
#include "LiquidCrystal.h"
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#include <stdio.h>
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#include <string.h>
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#include <inttypes.h>
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#include "WProgram.h"
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// When the display powers up, it is configured as follows:
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//
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// 1. Display clear
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// 2. Function set:
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// DL = 1; 8-bit interface data
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// N = 0; 1-line display
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// F = 0; 5x8 dot character font
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// 3. Display on/off control:
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// D = 0; Display off
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// C = 0; Cursor off
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// B = 0; Blinking off
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// 4. Entry mode set:
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// I/D = 1; Increment by 1
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// S = 0; No shift
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//
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// Note, however, that resetting the Arduino doesn't reset the LCD, so we
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// can't assume that its in that state when a sketch starts (and the
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// LiquidCrystal constructor is called).
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LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable,
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uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
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uint8_t d4, uint8_t d5, uint8_t d6, uint8_t d7) :
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_four_bit_mode(0), _rs_pin(rs), _rw_pin(rw), _enable_pin(enable)
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{
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_data_pins[0] = d0;
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_data_pins[1] = d1;
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_data_pins[2] = d2;
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_data_pins[3] = d3;
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_data_pins[4] = d4;
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_data_pins[5] = d5;
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_data_pins[6] = d6;
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_data_pins[7] = d7;
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pinMode(_rs_pin, OUTPUT);
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pinMode(_rw_pin, OUTPUT);
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pinMode(_enable_pin, OUTPUT);
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for (int i = 0; i < 8; i++)
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pinMode(_data_pins[i], OUTPUT);
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command(0x38); // function set: 8 bits, 1 line, 5x8 dots
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command(0x0C); // display control: turn display on, cursor off, no blinking
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command(0x06); // entry mode set: increment automatically, display shift, right shift
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clear();
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}
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LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable,
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uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3) :
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_four_bit_mode(1), _rs_pin(rs), _rw_pin(rw), _enable_pin(enable)
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{
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_data_pins[0] = d0;
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_data_pins[1] = d1;
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_data_pins[2] = d2;
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_data_pins[3] = d3;
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pinMode(_rs_pin, OUTPUT);
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pinMode(_rw_pin, OUTPUT);
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pinMode(_enable_pin, OUTPUT);
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for (int i = 0; i < 4; i++)
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pinMode(_data_pins[i], OUTPUT);
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command(0x28); // function set: 4 bits, 1 line, 5x8 dots
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command(0x0C); // display control: turn display on, cursor off, no blinking
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command(0x06); // entry mode set: increment automatically, display shift, right shift
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clear();
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}
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void LiquidCrystal::clear()
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{
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command(0x01); // clear display, set cursor position to zero
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delayMicroseconds(2000);
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}
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void LiquidCrystal::home()
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{
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command(0x02); // set cursor position to zero
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delayMicroseconds(2000);
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}
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void LiquidCrystal::setCursor(int col, int row)
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{
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int row_offsets[] = { 0x00, 0x40, 0x14, 0x54 };
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command(0x80 | (col + row_offsets[row]));
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}
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void LiquidCrystal::command(uint8_t value) {
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send(value, LOW);
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}
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void LiquidCrystal::write(uint8_t value) {
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send(value, HIGH);
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}
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void LiquidCrystal::send(uint8_t value, uint8_t mode) {
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digitalWrite(_rs_pin, mode);
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digitalWrite(_rw_pin, LOW);
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if (_four_bit_mode) {
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for (int i = 0; i < 4; i++) {
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digitalWrite(_data_pins[i], (value >> (i + 4)) & 0x01);
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}
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digitalWrite(_enable_pin, HIGH);
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digitalWrite(_enable_pin, LOW);
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for (int i = 0; i < 4; i++) {
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digitalWrite(_data_pins[i], (value >> i) & 0x01);
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}
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digitalWrite(_enable_pin, HIGH);
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digitalWrite(_enable_pin, LOW);
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} else {
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for (int i = 0; i < 8; i++) {
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digitalWrite(_data_pins[i], (value >> i) & 0x01);
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}
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digitalWrite(_enable_pin, HIGH);
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digitalWrite(_enable_pin, LOW);
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}
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}
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