rekahsoft/avr-lcd-lib
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Completed scrollUp and scrollDown functions

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This completes the functions for ANSI escapes. It required the LCD read
functionality from last commit to be efficient (memory wise).

Signed-off-by: Collin J. Doering <collin.doering@rekahsoft.ca>
This commit is contained in:
Collin J. Doering 2015-10-28 04:40:52 -04:00
parent 85fb4eca6a
commit d8068b8f7a
1 changed files with 54 additions and 0 deletions
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54
lcdLib.c
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@ -784,9 +784,63 @@ void eraseInline(uint8_t n) {
} }
void scrollUp(uint8_t n) { void scrollUp(uint8_t n) {
#if LCD_NUMBER_OF_LINES == 1
clearDisplay();
#else
if (n >= LCD_NUMBER_OF_LINES) {
clearDisplay();
} else {
uint8_t old_row, old_column;
getCursorPosition(&old_row, &old_column);
uint8_t len = (LCD_NUMBER_OF_LINES - n)*LCD_CHARACTERS_PER_LINE + 1;
char str[len];
readCharsFromLCD(n + 1, 1, LCD_NUMBER_OF_LINES, LCD_CHARACTERS_PER_LINE, str, len);
setCursorPosition(1, 1); // returnHome();
writeStringToLCD(str);
// Add n newlines to bottom of screen
for (uint8_t i = 0; i < n; i++) {
setCursorPosition(LCD_NUMBER_OF_LINES - i, 1);
eraseInline(2);
}
setCursorPosition(old_row, old_column);
}
#endif
} }
void scrollDown(uint8_t n) { void scrollDown(uint8_t n) {
#if LCD_NUMBER_OF_LINES == 1
clearDisplay();
#else
if (n >= LCD_NUMBER_OF_LINES) {
clearDisplay();
} else {
uint8_t old_row, old_column;
getCursorPosition(&old_row, &old_column);
uint8_t len = (LCD_NUMBER_OF_LINES - n)*LCD_CHARACTERS_PER_LINE + 1;
char str[len];
readCharsFromLCD(1, 1, LCD_NUMBER_OF_LINES - n, LCD_CHARACTERS_PER_LINE, str, len);
for (uint8_t column = n + 1, i = 0; column <= LCD_NUMBER_OF_LINES; column++) {
setCursorPosition(column , 1);
for (uint8_t row = 1; row <= LCD_CHARACTERS_PER_LINE; row++) {
loop_until_LCD_BF_clear();
writeCharToLCD_(str[i++]);
}
}
// Add n newlines to top of screen
for (uint8_t i = 1; i <= n; i++) {
setCursorPosition(i, 1);
eraseInline(2);
}
setCursorPosition(old_row, old_column);
}
#endif
} }
void saveCursorPosition() { void saveCursorPosition() {