LCD DOG clock with ESP8266 with fancy LCD commands

lcd-clock-esp.py

from machine import Pin, SPI
import ntptime
from utime import sleep_ms
import utime

import mel

rs_pin = Pin(2, Pin.OUT) # Pin D4. Do NOT use the regular MISO pin (D6)
cs_pin = Pin(15, Pin.OUT) # aka SS slave select
cs_pin.on()

#spi = SPI(sck=Pin(14), mosi=Pin(13), miso=Pin(12))
spi = SPI(1)
spi.init(phase = 0)
spi.init(baudrate=400000)

def write_val(csv, c):
    global cs_pin, rs_pin, spi
    rs_pin.value(csv)
    cs_pin.off()
    spi.write(bytearray([c]))
    cs_pin.on()
    sleep_ms(60)

def write_arr(csv, arr):
    global cs_pin, rs_pin, spi
    rs_pin.value(csv)
    cs_pin.off()
    spi.write(bytearray(arr))
    cs_pin.on()
    sleep_ms(60)        

contrast = 0x70  + 0b1000 # from 0x7C
contrast = 0x7C # original value (and better)
display = 0b1111 # ori 0x0F
init = [0x39, 0x1D, 0x50, 0x6C, contrast , 0x38, display, 0x01, 0x06]
for c in init: write_val(0, c)

#from machine import RTC
rtc = machine.RTC()

# execute table instruction N with value VAL
def tinst(n, val):
    write_arr(0, [0b001110000 + n, val])
    
# turn off cursor and blinking
tinst(0, 0b1100)                                    

def home(): tinst(0, 0b10)
def cls(): tinst(0, 0b1)
cls()
# https://www.ccsinfo.com/forum/viewtopic.php?t=39552
write_arr(0, [0b00101010, 0b00011000, 0b00101100]) # double size

def write_home(text):
    home()
    write_arr(1, text)    

def show_date():
    y, mon, d, _, h, mins, s, _  = rtc.datetime()
    mon, d, h = mel.adjustBST(y, mon, d, h)
    #text = '{:04d}-{:02d}-{:02d} {:02d}:{:02d}:{:02d}'.format(t[0], t[1], t[2], t[4], t[5], t[6])
    text = '{:02d}:{:02d}:{:02d}'.format(h, mins, s)
    write_home(text)

show_date()    

mel.do_connect()

def loop():
    while True:
        cls()
        write_home("NTP")
        ntptime.settime()
        for i in range(60*30): # every 30 minutes, approximately
            show_date()
            utime.sleep(1)
loop()