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def custom_char(self, location, charmap):
# Write a character to one of the 8 CGRAM locations, available
# as chr(0) through chr(7).
location &= 0x7
self.hal_write_command(self.LCD_CGRAM | (location << 3))
self.hal_sleep_us(40)
for i in range(8):
self.hal_write_data(charmap[i])
self.hal_sleep_us(40)
self.move_to(self.cursor_x, self.cursor_y)
def hal_backlight_on(self):
# Allows the hal layer to turn the backlight on.
# If desired, a derived HAL class will implement this function.
pass
def hal_backlight_off(self):
# Allows the hal layer to turn the backlight off.
# If desired, a derived HAL class will implement this function.
pass
def hal_write_command(self, cmd):
# Write a command to the LCD.
# It is expected that a derived HAL class will implement this function.
raise NotImplementedError
def hal_write_data(self, data):
# Write data to the LCD.
# It is expected that a derived HAL class will implement this function.
raise NotImplementedError
def hal_sleep_us(self, usecs):
# Sleep for some time (given in microseconds)
time.sleep_us(usecs)
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