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def hide_cursor(self):
# Causes the cursor to be hidden
self.hal_write_command(self.LCD_ON_CTRL | self.LCD_ON_DISPLAY)
def blink_cursor_on(self):
# Turns on the cursor, and makes it blink
self.hal_write_command(self.LCD_ON_CTRL | self.LCD_ON_DISPLAY |
def blink_cursor_off(self):
# Turns on the cursor, and makes it no blink (i.e. be solid)
self.hal_write_command(self.LCD_ON_CTRL | self.LCD_ON_DISPLAY |
def display_on(self):
# Turns on (i.e. unblanks) the LCD
self.hal_write_command(self.LCD_ON_CTRL | self.LCD_ON_DISPLAY)
def display_off(self):
# Turns off (i.e. blanks) the LCD
self.hal_write_command(self.LCD_ON_CTRL)
def backlight_on(self):
# Turns the backlight on.
# This isn't really an LCD command, but some modules have backlight
# controls, so this allows the hal to pass through the command.
self.backlight = True
self.hal_backlight_on()
def backlight_off(self):
# Turns the backlight off.
# This isn't really an LCD command, but some modules have backlight
# controls, so this allows the hal to pass through the command.
self.backlight = False
self.hal_backlight_off()
def move_to(self, cursor_x, cursor_y):
# Moves the cursor position to the indicated position. The cursor
# position is zero based (i.e. cursor_x == 0 indicates first column).
self.cursor_x = cursor_x
self.cursor_y = cursor_y
addr = cursor_x & 0x3f
if cursor_y & 1:
addr += 0x40
if cursor_y & 2:
addr += self.num_columns
self.hal_write_command(self.LCD_DDRAM | addr)
def putchar(self, char):
# Writes the indicated character to the LCD at the current cursor
# position, and advances the cursor by one position.
if char == '\n':
if self.implied_newline:
# self.implied_newline means we advanced due to a wraparound,
# so if we get a newline right after that we ignore it.
pass
else:
self.cursor_x = self.num_columns
else:
self.hal_write_data(ord(char))
self.cursor_x += 1
if self.cursor_x >= self.num_columns:
self.cursor_x = 0
self.cursor_y += 1
self.implied_newline = (char != '\n')
if self.cursor_y >= self.num_lines:
self.cursor_y = 0
self.move_to(self.cursor_x, self.cursor_y)
def putstr(self, string):
# Write the indicated string to the LCD at the current cursor
# position and advances the cursor position appropriately.
for char in string:
self.putchar(char)
self.LCD_ON_CURSOR | self.LCD_ON_BLINK)
self.LCD_ON_CURSOR)
# Lines 1 & 3 add 0x40
# Lines 2 & 3 add number of columns
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