Diff: TextLCD_ST7032I2C.cpp

Revision:

0:db0ffd858ca1

Child:

1:0b6f271981a5

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TextLCD_ST7032I2C.cpp	Mon Apr 06 20:16:13 2015 +0000
@@ -0,0 +1,190 @@
+// ==================================================== Mar 18 2015, kayeks ==
+// TextLCD_ST7032I2C.cpp
+// ===========================================================================
+// Text console library for ST7032 text LCD controller over I2C interface.
+
+#include <string.h>
+#include "TextLCD_ST7032I2C.h"
+
+TextLCD_ST7032I2C::TextLCD_ST7032I2C(PinName sda, PinName scl, uint8_t address,
+                                     uint8_t columns, uint8_t rows)
+:
+    _i2c(sda, scl)
+{
+    // Copy parameters
+    _columns = MIN(columns, 16);
+    _rows = MIN(rows, 2);
+    _address = address & 0xfe;
+    
+    // Allocate line buffer
+    _lineBuffer = new uint8_t*[_rows];
+    for (uint8_t i = 0; i < _rows; i++) {
+        _lineBuffer[i] = new uint8_t[_columns];
+    }
+}
+
+TextLCD_ST7032I2C::~TextLCD_ST7032I2C() {
+    for (uint8_t i = 0; i < _rows; i++) {
+        delete[] _lineBuffer[i];
+    }
+    delete[] _lineBuffer;
+}
+
+void TextLCD_ST7032I2C::clear() {
+    for (uint8_t j = 0; j < _rows; j++) {
+        locate(0, j);
+        for (uint8_t i = 0; i < _columns; i++) {
+            data(' ');
+        }
+    }
+}
+
+void TextLCD_ST7032I2C::init(uint8_t osc, uint8_t rab, uint8_t contrast, Bias bias) {
+    // Copy parameters
+    _osc = osc & 0x07;
+    _rab = MIN(rab, 7);
+    _contrast = MIN(contrast, 63);
+    _bias = bias;
+    
+    command(FUNCTION_8B_2LINE_7DOT_IS0);
+    command(FUNCTION_8B_2LINE_7DOT_IS1);
+    switch (bias) {
+    case Bias1_4:
+        command(IS1_BIAS4_OSC + _osc);
+        break;
+    case Bias1_5:
+        command(IS1_BIAS5_OSC + _osc);
+        break;
+    }
+    command(IS1_CONTRAST + (_contrast & 0x0f));
+    command(IS1_ICON_ON_BOOST_ON_CONTRAST + (_contrast >> 4));
+    command(IS1_FOLLOWER_ON_RAB + _rab);
+    if (_rows == 1) {
+        command(FUNCTION_8B_1LINE_7DOT_IS0);
+    } else if (_rows == 2) {
+        command(FUNCTION_8B_2LINE_7DOT_IS0);
+    }
+    command(DISPLAY_ON_CURSOR_OFF_POS_OFF);
+}
+
+void TextLCD_ST7032I2C::cls() {
+    clear();
+    for (uint8_t j = 0; j < _rows; j++) {
+        memset(_lineBuffer[j], ' ', _columns);
+    }
+    _column = 0;
+    _row = 0;
+}
+
+void TextLCD_ST7032I2C::locate(uint8_t column, uint8_t row) {
+    if (column < _columns && row < _rows) {
+        command(DDRAM + ((row << 6) | column));
+        _column = column;
+        _row = row;
+    }
+}
+
+void TextLCD_ST7032I2C::iconOn() {
+    is1();
+    command(IS1_ICON_ON_BOOST_ON_CONTRAST + (_contrast >> 4));
+}
+
+void TextLCD_ST7032I2C::iconOff() {
+    is1();
+    command(IS1_ICON_OFF_BOOST_ON_CONTRAST + (_contrast >> 4));
+}
+
+void TextLCD_ST7032I2C::setIcon(uint8_t iconAddr, uint8_t bits) {
+    is1();
+    command(IS1_ICON_ADDR + (iconAddr & 0x0f));
+    data(bits & 0x1f);
+}
+
+int TextLCD_ST7032I2C::_putc(int c) {
+    switch (c) {
+    case '\r':  // Carriage return
+        _column = 0;
+        locate(_column, _row);
+        break;
+    case '\n':  // Line feed
+        if (_row == _rows - 1) {
+            shiftUp();
+        } else {
+            _row++;
+        }
+        break;
+    case '\f':  // Form feed
+        // Clear screen
+        cls();
+        break;
+    default:
+        // Break line if the cursor reaches end
+        if (_column == _columns) {
+            if (_row == _rows - 1) {
+                shiftUp();
+            } else {
+                _row++;
+            }
+            _column = 0;
+        }
+        locate(_column, _row);
+        data(c);
+        _lineBuffer[_row][_column] = c;
+        _column++;
+        break;
+    }
+    return 0;
+}
+
+int TextLCD_ST7032I2C::_getc() {
+    return 0;
+}
+
+void TextLCD_ST7032I2C::shiftUp() {
+    // Move line buffer content
+    for (uint8_t j = 0; j < _rows - 1; j++) {
+        memcpy(_lineBuffer[j], _lineBuffer[j + 1], _columns);
+    }
+    // Clear last line
+    memset(_lineBuffer[_rows - 1], ' ', _columns);
+    
+    // Redraw
+    for (uint8_t j = 0; j < _rows; j++) {
+        locate(0, j);
+        for (uint8_t i = 0; i < _columns; i++) {
+            data(_lineBuffer[j][i]);
+        }
+    }
+}
+
+void TextLCD_ST7032I2C::is0() {
+    if (_rows == 1) {
+        command(FUNCTION_8B_1LINE_7DOT_IS0);
+    } else if (_rows == 2) {
+        command(FUNCTION_8B_2LINE_7DOT_IS0);
+    }
+}
+
+void TextLCD_ST7032I2C::is1() {
+    if (_rows == 1) {
+        command(FUNCTION_8B_1LINE_7DOT_IS1);
+    } else if (_rows == 2) {
+        command(FUNCTION_8B_2LINE_7DOT_IS1);
+    }
+}
+
+void TextLCD_ST7032I2C::command(uint8_t c) {
+    char cbuf[2];
+    
+    cbuf[0] = 0x00;
+    cbuf[1] = c;
+    _i2c.write(_address, cbuf, 2);
+}
+
+void TextLCD_ST7032I2C::data(uint8_t d) {
+    char dbuf[2];
+    
+    dbuf[0] = 0x40;
+    dbuf[1] = d;
+    _i2c.write(_address, dbuf, 2);
+}