From 2d5bc015fbd70befc08c2295630ff06770e9d7c8 Mon Sep 17 00:00:00 2001
From: "David A. Mellis" <d.mellis@arduino.cc>
Date: Sat, 19 Apr 2008 03:31:36 +0000
Subject: Adding LiquidCrystal library.

---
 libraries/LiquidCrystal/LiquidCrystal.cpp | 128 ++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100755 libraries/LiquidCrystal/LiquidCrystal.cpp

(limited to 'libraries/LiquidCrystal/LiquidCrystal.cpp')

diff --git a/libraries/LiquidCrystal/LiquidCrystal.cpp b/libraries/LiquidCrystal/LiquidCrystal.cpp
new file mode 100755
index 0000000..c5acc85
--- /dev/null
+++ b/libraries/LiquidCrystal/LiquidCrystal.cpp
@@ -0,0 +1,128 @@
+#include "LiquidCrystal.h"
+
+#include <stdio.h>
+#include <string.h>
+#include <inttypes.h>
+#include "WProgram.h"
+
+// 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, however, that resetting the Arduino doesn't reset the LCD, so we
+// can't assume that its in that state when a sketch starts (and the
+// LiquidCrystal constructor is called).
+
+LiquidCrystal::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) : Print(baseWrite),
+  _four_bit_mode(0), _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; 
+  
+  pinMode(_rs_pin, OUTPUT);
+  pinMode(_rw_pin, OUTPUT);
+  pinMode(_enable_pin, OUTPUT);
+  
+  for (int i = 0; i < 8; i++)
+    pinMode(_data_pins[i], OUTPUT);
+ 
+  command(0x38);  // function set: 8 bits, 1 line, 5x8 dots
+  command(0x0C);  // display control: turn display on, cursor off, no blinking
+  command(0x06);  // entry mode set: increment automatically, display shift, right shift
+  clear();
+}
+
+LiquidCrystal::LiquidCrystal(uint8_t rs, uint8_t rw, uint8_t enable,
+  uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3) : Print(baseWrite),
+  _four_bit_mode(1), _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; 
+  
+  pinMode(_rs_pin, OUTPUT);
+  pinMode(_rw_pin, OUTPUT);
+  pinMode(_enable_pin, OUTPUT);
+  
+  for (int i = 0; i < 4; i++)
+    pinMode(_data_pins[i], OUTPUT);
+ 
+  command(0x28);  // function set: 4 bits, 1 line, 5x8 dots
+  command(0x0C);  // display control: turn display on, cursor off, no blinking
+  command(0x06);  // entry mode set: increment automatically, display shift, right shift
+  clear();
+}
+
+void LiquidCrystal::clear()
+{
+  command(0x01);  // clear display, set cursor position to zero
+  delayMicroseconds(2000);
+}
+
+void LiquidCrystal::home()
+{
+  command(0x02);  // set cursor position to zero
+  delayMicroseconds(2000);
+}
+
+void LiquidCrystal::setCursor(int col, int row)
+{
+  int row_offsets[] = { 0x00, 0x40, 0x14, 0x54 };
+  command(0x80 | (col + row_offsets[row]));
+}
+
+void LiquidCrystal::command(int value) {
+  write(value, LOW);
+}
+
+void LiquidCrystal::write(int value, int mode) {
+  digitalWrite(_rs_pin, mode);
+  digitalWrite(_rw_pin, LOW);
+
+  if (_four_bit_mode) {
+    for (int i = 0; i < 4; i++) {
+      digitalWrite(_data_pins[i], (value >> (i + 4)) & 0x01);
+    }
+    
+    digitalWrite(_enable_pin, HIGH);
+    digitalWrite(_enable_pin, LOW);
+    
+    for (int i = 0; i < 4; i++) {
+      digitalWrite(_data_pins[i], (value >> i) & 0x01);
+    }
+
+    digitalWrite(_enable_pin, HIGH);
+    digitalWrite(_enable_pin, LOW);
+  } else {
+    for (int i = 0; i < 8; i++) {
+      digitalWrite(_data_pins[i], (value >> i) & 0x01);
+    }
+
+    digitalWrite(_enable_pin, HIGH);
+    digitalWrite(_enable_pin, LOW);
+  }
+}
+
+void baseWrite(uint8_t value, void *instance) {
+  ((LiquidCrystal *) instance)->write(value);
+}
-- 
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