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Added a function to LiquidCrystal to tweak the memory offset of the rows... #2273

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Added a function to LiquidCrystal to tweak the memory offset of the rows... #2273

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11 changes: 9 additions & 2 deletions libraries/LiquidCrystal/LiquidCrystal.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -88,6 +88,8 @@ void LiquidCrystal::begin(uint8_t cols, uint8_t lines, uint8_t dotsize) {
}
_numlines = lines;
_currline = 0;
int row_offsets[] = { 0x00, 0x40, 0x14, 0x54 };
setRowOffsets(row_offsets);

// for some 1 line displays you can select a 10 pixel high font
if ((dotsize != 0) && (lines == 1)) {
Expand Down Expand Up @@ -172,12 +174,17 @@ void LiquidCrystal::home()

void LiquidCrystal::setCursor(uint8_t col, uint8_t row)
{
int row_offsets[] = { 0x00, 0x40, 0x14, 0x54 };
if ( row >= _numlines ) {
row = _numlines-1; // we count rows starting w/0
}

command(LCD_SETDDRAMADDR | (col + row_offsets[row]));
command(LCD_SETDDRAMADDR | (col + _row_offsets[row]));
}

// Allows the tweaking of the memory offsets for each row.
void LiquidCrystal::setRowOffsets(int row_offsets[])
{
_row_offsets = row_offsets;
}

// Turn the display on/off (quickly)
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5 changes: 4 additions & 1 deletion libraries/LiquidCrystal/LiquidCrystal.h
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Expand Up @@ -78,7 +78,8 @@ class LiquidCrystal : public Print {
void noAutoscroll();

void createChar(uint8_t, uint8_t[]);
void setCursor(uint8_t, uint8_t);
void setCursor(uint8_t, uint8_t);
void setRowOffsets(int[]);
virtual size_t write(uint8_t);
void command(uint8_t);

Expand All @@ -101,6 +102,8 @@ class LiquidCrystal : public Print {
uint8_t _initialized;

uint8_t _numlines,_currline;

int *_row_offsets; // array of memory offsets for the start of each row
};

#endif
1 change: 1 addition & 0 deletions libraries/LiquidCrystal/keywords.txt
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Expand Up @@ -30,6 +30,7 @@ rightToLeft KEYWORD2
scrollDisplayLeft KEYWORD2
scrollDisplayRight KEYWORD2
createChar KEYWORD2
setRowOffsets KEYWORD2

#######################################
# Constants (LITERAL1)
Expand Down