class Wh1602:
def __init__(self):
self.reserve_gpios()
self.rw.set_value(0)
sleep(0.05)
def __del__(self):
pass
def reserve_gpios(self):
self.rs = Gpio(2, "out")
self.rw = Gpio(3, "out")
self.e = Gpio(4, "out")
self.d = [Gpio(17, "out"), Gpio(27, "out"),
Gpio(22, "out"), Gpio(23, "out")]
def lcd_write_nibble(self, val):
for i, p in enumerate(self.d):
p.set_value(0 if (val & 1 << i) == 0 else 1)
self.e.set_value(1)
sleep(0.02)
self.e.set_value(0)
def lcd_write_data(self, data):
self.lcd_write_nibble(data >> 4)
self.lcd_write_nibble(data & 0xF)
def init_lcd(self):
self.rs.set_value(0)
sleep(0.2)
self.lcd_write_nibble(0x03)
sleep(0.05)
self.lcd_write_nibble(0x03)
sleep(0.05)
self.lcd_write_nibble(0x02)
sleep(0.02)
self.lcd_write_data(0x08)
sleep(0.02)
self.lcd_write_data(0x01)
sleep(0.02)
self.lcd_write_data(0x06)
sleep(0.02)
self.lcd_write_data(0x0D)
sleep(0.02)
self.rs.set_value(1)
def lcd_write_string(self, str):
for s in str:
self.lcd_write_data(s)
