def main():
GPIO.setwarnings(False)
GPIO.setmode(GPIO.BCM)
GPIO.setup(Col1, GPIO.IN)
GPIO.setup(Col2, GPIO.IN)
GPIO.setup(Col3, GPIO.IN)
GPIO.setup(Row1, GPIO.OUT)
GPIO.setup(Row2, GPIO.OUT)
GPIO.setup(Row3, GPIO.OUT)
GPIO.setup(Row4, GPIO.OUT)
for row in range(0, 4):
GPIO.output(Rows[row], 1)
lcd.lcd_begin(D4, D5, D6, D7, RS, EN)
lcd.lcd_clear()
lcd.send_cmd(0x0C)
lcd.send_cmd(0x0F)
GPIO.add_event_detect(
Col1, GPIO.RISING,
ScanISR) # Setup interrupt to button pin, H->L, ISR, debounce time
GPIO.add_event_detect(Col2, GPIO.RISING, ScanISR)
GPIO.add_event_detect(Col3, GPIO.RISING, ScanISR)
while True:
time.sleep(1)
def ISR(pin):
global counter
if pin == BUTTON: # check if button pin generated interrupt
counter = counter + 1
lcd.lcd_clear()
lcd.lcd_message(str(counter))
def ScanISR(pin):
global counter
global counter2
global push_flag
global time_stamp
time_now = time.time()
column = pin - 14
if (time_now -
time_stamp) >= 0.03: # check if button pin generated interrupt
for row in range(0, 4):
GPIO.output(Rows[row], 0)
for row in range(0, 4):
GPIO.output(Rows[row], GPIO.HIGH)
if GPIO.input(pin) == GPIO.HIGH:
message = Lookup[row][column]
if message == "*":
lcd.lcd_clear()
break
elif message == "#":
lcd.send_cmd(0xC0)
break
else:
counter = counter + 1
if (counter == 8):
lcd.send_cmd(0xC0)
if (counter == 15):
lcd.lcd_clear()
counter = 0
lcd.lcd_message(message)
break
GPIO.output(Rows[row], GPIO.LOW)
for row in range(0, 4):
GPIO.output(Rows[row], 1)
time_stamp = time_now
def ISR(pin):
global counter
global push_flag
global time_stamp
time_now = time.time()
if pin == BUTTON and not push_flag and (
time_now -
time_stamp) >= 0.10: # check if button pin generated interrupt
push_flag = 1
counter = counter + 1
lcd.lcd_clear()
lcd.lcd_message(str(counter))
push_flag = 0
time_stamp = time_now
def fill_lcd_screen(firstRow, secondRow):
lcd.lcd_clear()
lcd.lcd_message(firstRow)
lcd.send_cmd(0xC0)
lcd.lcd_message(secondRow)