Diff: LCD.cpp

Revision:

0:b3def1d4f466

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/LCD.cpp	Thu Dec 22 06:12:07 2011 +0000
@@ -0,0 +1,193 @@
+#include "LCD.h"
+#include "mbed.h"
+
+#define I2C_ADDR 0x7C
+
+#define COLUMNS 16
+#define ROWS 2
+
+#define COMMAND 0x00
+#define DATA 0x40
+
+// Clear Display
+#define CLEAR_DISPLAY 0x01
+
+// Return Home
+#define RETURN_HOME 0x02
+
+// Display ON/OFF
+#define DISPLAY_ON_OFF_CONTROL 0x08
+#define DISPLAY_ON 1 << 2
+#define CURSOR_ON 1 << 1
+#define CURSOR_POSITION_ON 1 << 0
+
+// Function set
+#define FUNCTION_SET 0x20
+#define DL 1 << 4 // 8 bit interface
+#define N 1 << 3 // 2 lines
+#define DH 1 << 2 // double height
+#define IS 1 << 0 // instruction table select
+
+// Instruction Table 0 (IS = 0)
+#define CURSOR_OR_DISPLAY_SHIFT = 0x10;
+#define SC 1 << 3 // select screen (DISPLAY)
+#define RL 1 << 2 // moving to the right
+
+// Instruction Table 1 (when IS = 1)
+#define INTERNAL_OSC_FREQUENCY 0x10
+#define BS 1 << 3 // 1/4 bias
+#define FR_MASK 7 // adjust internal OSC freq
+#define SET_ICON_ADDRESS 0x40
+#define AC_MASK 7 // set ICON addr in address counter
+#define POWER_ICON_CONTRAST_CONTROL 0x50
+#define ION 1 << 3 // Icon On
+#define BON 1 << 2 // Booster On
+#define CONTRAST_MASK1 3 // contrast (higher bits)
+#define FOLLOWER_CONTROL 0x60
+#define FON 1 << 3 // Follower On
+#define RAB_MASK 7 // Rab
+#define CONTRAST_SET 0x70
+#define CONTRAST_MASK0 15 // contrast (lower bits)
+
+// Set DDRAM Address
+#define SET_DDRAM_ADDRESS 0x80
+
+Serial pc(USBTX, USBRX);
+LCD::LCD(PinName sdaPin, PinName sclPin, PinName resetPin, PinName backlightPin, int contrast, bool cursor, bool blink)
+        : _reset(resetPin), backlight(backlightPin), i2c(sdaPin, sclPin), contrast(contrast), cursor(cursor), blink(blink) {
+    resetEnabled = resetPin != NC;
+    backlightEnabled = backlightPin != NC;
+    reset();
+}
+
+void LCD::reset() {
+    wait(0.015);
+    if (resetEnabled)
+        _reset = 0;
+    wait(0.01);
+    if (resetEnabled)
+        _reset = 1;
+    wait(0.05);
+
+    writeCommand(FUNCTION_SET | DL | N | (IS & 0));
+    writeCommand(FUNCTION_SET | DL | N | (IS & 1));
+    writeCommand(INTERNAL_OSC_FREQUENCY | BS | (FR_MASK & 0));
+    writeCommand(CONTRAST_SET | (CONTRAST_MASK0 & contrast));
+    writeCommand(POWER_ICON_CONTRAST_CONTROL | ION | BON | (CONTRAST_MASK1 & contrast >> 4));
+    //writeCommand(FOLLOWER_CONTROL | FON | (RAB_MASK & 2));
+    writeCommand(FOLLOWER_CONTROL | FON | (RAB_MASK & 4));
+    wait(0.3);
+
+    writeCommand(DISPLAY_ON_OFF_CONTROL | DISPLAY_ON | (cursor ? CURSOR_ON : 0) | (blink ? CURSOR_POSITION_ON : 0));
+    wait(0.002);
+    cls();
+}
+
+void LCD::display(int column, int row, int c) {
+    writeCommand(column + 0x40 * row + 0x80);
+    writeData(c);
+    if (row == 1) row2[column] = c;
+}
+
+void LCD::cls() {
+    for (int i = 0; i < 16; i++) {
+        writeCommand(FUNCTION_SET | DL | N | (IS & 1));
+        writeCommand(SET_ICON_ADDRESS | i);
+        //writeCommand(0x39);
+        //writeCommand(0x40 + i);
+        writeData(0);
+    }
+
+    writeCommand(CLEAR_DISPLAY);
+    wait(0.00164f);
+    locate(0, 0);
+}
+
+void LCD::locate(int column, int row) {
+    this->column = column;
+    this->row = row;
+}
+
+int LCD::_putc(int value) {
+    if (row >= ROWS) {
+        scrollDown();
+        row = 1;
+    }
+    if (value == '\n')
+        column = COLUMNS;
+    else
+        display(column, row, value);
+
+    if (++column >= COLUMNS) {
+        column = 0;
+        row++;
+    }
+
+    return value;
+}
+
+int LCD::_getc() {
+    return -1;
+}
+
+void LCD::scrollDown() {
+    writeCommand(SET_DDRAM_ADDRESS | 0x00);
+    writeData(row2, sizeof(row2));
+    memset(row2, ' ', sizeof(row2));
+    writeCommand(SET_DDRAM_ADDRESS | 0x40);
+    writeData(row2, sizeof(row2));
+}
+
+void LCD::writeCommand(int command) {
+    char buf[] = {COMMAND, command};
+    i2c.write(I2C_ADDR, buf, sizeof(buf));
+}
+
+void LCD::writeData(int data) {
+    char buf[] = {DATA, data};
+    i2c.write(I2C_ADDR, buf, sizeof(buf));
+}
+
+void LCD::writeData(char data[], int length) {
+    char buf[length + 1];
+    buf[0] = DATA;
+    memcpy(&buf[1], data, length);
+    i2c.write(I2C_ADDR, buf, sizeof(buf));
+}
+
+void LCD::showIcon(Icon icon) {
+    switch (icon) {
+        case ALL:
+            for (int i = 0; i < 16; i++) {
+                writeCommand(FUNCTION_SET | DL | N | (IS & 1));
+                writeCommand(SET_ICON_ADDRESS | i);
+                writeData(0x1F);
+            }
+            break;
+        default:
+            writeCommand(FUNCTION_SET | DL | N | (IS & 1));
+            writeCommand(SET_ICON_ADDRESS | (icon >> 8));
+            writeData(icon & 0xFF);
+    }
+}
+
+void LCD::hideIcon(Icon icon) {
+    switch (icon) {
+        case ALL:
+            for (int i = 0; i < 16; i++) {
+                writeCommand(FUNCTION_SET | DL | N | (IS & 1));
+                writeCommand(SET_ICON_ADDRESS | i);
+                writeData(0);
+            }
+            break;
+        default:
+            writeCommand(FUNCTION_SET | DL | N | (IS & 1));
+            writeCommand(SET_ICON_ADDRESS | (icon >> 8));
+            writeData(0);
+    }
+}
+
+void LCD::setBacklight(bool on) {
+    if (backlightEnabled)
+        backlight = on;
+}
\ No newline at end of file