2023年6月 – 計測・解析ラボ

MicroPythonの使い心地を知るためにRaspberry Pi Pico Wに安価な1.69インチのTFTディスプレイを接続してNTPで更新した内蔵RTC(リアルタイムクロック)の時刻を表示するプログラムを作りました。

Raspberry Pi Pico W (詳細情報はスイッチサイエンスの商品ページから辿ってください)

1.69インチのTFTディスプレイ (詳細情報はAliexpressの商品ページから辿ってください。400円程度で購入できるSPI通信の240×280画素のフルカラーディスプレイでインターフェースコントローラはst7789を使用していてします。)

配線
<TFTディスプレイ> ——– <Pico W>
GND ——– GND (18pin)
VCC ——– 3V3(OUT) (36pin)
SCL(SCLK) ——– SPI1SCK(19pin)
SDA(MOSI,SDI,DIN) ——– SPI1TX(20pin)
RES(Reset) ——– GP11(15pin)
DC(Data/Command) ——– GP12(16pin)
CS ——– SPI1CSn(17pin)
BLK(Backlight) ——– GP10(14pin)

st7789用ライブラリ
ST7789 Driver for MicroPythonとしてgithubに公開されています。Pico W用MicroPython Firmware （https://github.com/russhughes/st7789_mpy/tree/master/firmware/RP2W/firmware.uf2）をダウンロードして、Pico Wのブートボタンを押しながらPCのUSBポートに接続し、現れたUSBドライブにfirmware.uf2ファイルをドラッグ・ドロップします。

from machine import Pin, SPI
import st7789
import utime
import network
import ntptime_jp

SSID = 'yourSSID'
PASSWORD = 'YourPassword'

BACKLIGHT_PIN = 10
RESET_PIN = 11
DC_PIN = 12
CS_PIN = 13
CLK_PIN = 14
DIN_PIN = 15 # lower left corner

import romand as vector_font

spi = SPI(1, baudrate=31250000, sck=Pin(CLK_PIN), mosi=Pin(DIN_PIN))
tft = st7789.ST7789(spi, 240, 320,
    reset=Pin(RESET_PIN, Pin.OUT),
    cs=Pin(CS_PIN, Pin.OUT),
    dc=Pin(DC_PIN, Pin.OUT),
    backlight=Pin(BACKLIGHT_PIN, Pin.OUT),
    rotation=3)
tft.init()

sta_if = network.WLAN(network.STA_IF)
sta_if.active(True)
sta_if.connect(SSID, PASSWORD)
while not sta_if.isconnected():
    pass
ntptime_jp.settime()

str_md_c = ""
str_hm_c = ""
str_s_c = ""
while True:
    time_now = utime.localtime()
    #print(utime.localtime())
    str_md = "{:>2}".format(str(time_now[1])) + "." + "{:>2}".format(str(time_now[2])) + "." + "{:>4}".format(str(time_now[0]))
    str_hm = "{:>2}".format(str(time_now[3]))  + ":" + "{:0>2}".format(str(time_now[4]))
    str_s = "{:0>2}".format(str(time_now[5]))
    if str_md != str_md_c :
        tft.draw(vector_font, str_md_c,50, 30, st7789.color565(0,0,0), 1.4)
        tft.draw(vector_font, str_md,50, 30, st7789.color565(255,255,255), 1.4)
        str_md_c = str_md
    if str_hm != str_hm_c :
        tft.draw(vector_font, str_hm_c,30, 130, st7789.color565(0,0,0), 2.8)
        tft.draw(vector_font, str_hm,30, 130, st7789.color565(255,255,255), 2.8)
        str_hm_c = str_hm
    if str_s != str_s_c :
        tft.draw(vector_font, str_s_c,200, 210, st7789.color565(0,0,0), 2.0)
        tft.draw(vector_font, str_s,200, 210, st7789.color565(255,0,255), 2.0)
        str_s_c = str_s

from machine import Pin, SPI

import st7789

import utime

import network

import ntptime_jp

SSID = 'yourSSID'

PASSWORD = 'YourPassword'

BACKLIGHT_PIN = 10

RESET_PIN = 11

DC_PIN = 12

CS_PIN = 13

CLK_PIN = 14

DIN_PIN = 15 # lower left corner

import romand as vector_font

spi = SPI(1, baudrate=31250000, sck=Pin(CLK_PIN), mosi=Pin(DIN_PIN))

tft = st7789.ST7789(spi, 240, 320,

reset=Pin(RESET_PIN, Pin.OUT),

cs=Pin(CS_PIN, Pin.OUT),

dc=Pin(DC_PIN, Pin.OUT),

backlight=Pin(BACKLIGHT_PIN, Pin.OUT),

rotation=3)

tft.init()

sta_if = network.WLAN(network.STA_IF)

sta_if.active(True)

sta_if.connect(SSID, PASSWORD)

while not sta_if.isconnected():

pass

ntptime_jp.settime()

str_md_c = ""

str_hm_c = ""

str_s_c = ""

while True:

time_now = utime.localtime()

#print(utime.localtime())

str_md = "{:>2}".format(str(time_now[1])) + "." + "{:>2}".format(str(time_now[2])) + "." + "{:>4}".format(str(time_now[0]))

str_hm = "{:>2}".format(str(time_now[3])) + ":" + "{:0>2}".format(str(time_now[4]))

str_s = "{:0>2}".format(str(time_now[5]))

if str_md != str_md_c :

tft.draw(vector_font, str_md_c,50, 30, st7789.color565(0,0,0), 1.4)

tft.draw(vector_font, str_md,50, 30, st7789.color565(255,255,255), 1.4)

str_md_c = str_md

if str_hm != str_hm_c :

tft.draw(vector_font, str_hm_c,30, 130, st7789.color565(0,0,0), 2.8)

tft.draw(vector_font, str_hm,30, 130, st7789.color565(255,255,255), 2.8)

str_hm_c = str_hm

if str_s != str_s_c :

tft.draw(vector_font, str_s_c,200, 210, st7789.color565(0,0,0), 2.0)

tft.draw(vector_font, str_s,200, 210, st7789.color565(255,0,255), 2.0)

str_s_c = str_s

NTP時刻を取得するライブラリは時差を補正することができなかったので、ライブラリ内でJAPAN_TIME = 9*60*60を補正してRTCに書き込むことにしました。ntptime_jp.pyという名前でpico Wに保存しました。（オリジナルはmicropython-lib/micropython/net/ntptime/ntptime.py です。）

import utime

try:
    import usocket as socket
except:
    import socket
try:
    import ustruct as struct
except:
    import struct

# The NTP host can be configured at runtime by doing: ntptime.host = 'myhost.org'
#host = "pool.ntp.org"
host = "ntp.nict.jp"
JAPAN_TIME = 9*60*60
# The NTP socket timeout can be configured at runtime by doing: ntptime.timeout = 2
#timeout = 1
timeout = 2

def time():
    NTP_QUERY = bytearray(48)
    NTP_QUERY[0] = 0x1B
    addr = socket.getaddrinfo(host, 123)[0][-1]
    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    try:
        s.settimeout(timeout)
        res = s.sendto(NTP_QUERY, addr)
        msg = s.recv(48)
    finally:
        s.close()
    val = struct.unpack("!I", msg[40:44])[0]

    EPOCH_YEAR = utime.gmtime(0)[0]
    if EPOCH_YEAR == 2000:
        # (date(2000, 1, 1) - date(1900, 1, 1)).days * 24*60*60
        NTP_DELTA = 3155673600
    elif EPOCH_YEAR == 1970:
        # (date(1970, 1, 1) - date(1900, 1, 1)).days * 24*60*60
        NTP_DELTA = 2208988800
    else:
        raise Exception("Unsupported epoch: {}".format(EPOCH_YEAR))

    return val - NTP_DELTA


# There's currently no timezone support in MicroPython, and the RTC is set in UTC time.
def settime():
    t = time()
    import machine
    tm = utime.gmtime(t + JAPAN_TIME)
    machine.RTC().datetime((tm[0], tm[1], tm[2], tm[6] + 1, tm[3], tm[4], tm[5], 0))

import utime

try:

import usocket as socket

except:

import socket

try:

import ustruct as struct

except:

import struct

# The NTP host can be configured at runtime by doing: ntptime.host = 'myhost.org'

#host = "pool.ntp.org"

host = "ntp.nict.jp"

JAPAN_TIME = 9*60*60

# The NTP socket timeout can be configured at runtime by doing: ntptime.timeout = 2

#timeout = 1

timeout = 2

def time():

NTP_QUERY = bytearray(48)

NTP_QUERY[0] = 0x1B

addr = socket.getaddrinfo(host, 123)[0][-1]

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

try:

s.settimeout(timeout)

res = s.sendto(NTP_QUERY, addr)

msg = s.recv(48)

finally:

s.close()

val = struct.unpack("!I", msg[40:44])[0]

EPOCH_YEAR = utime.gmtime(0)[0]

if EPOCH_YEAR == 2000:

# (date(2000, 1, 1) - date(1900, 1, 1)).days * 24*60*60

NTP_DELTA = 3155673600

elif EPOCH_YEAR == 1970:

# (date(1970, 1, 1) - date(1900, 1, 1)).days * 24*60*60

NTP_DELTA = 2208988800

else:

raise Exception("Unsupported epoch: {}".format(EPOCH_YEAR))

return val - NTP_DELTA

# There's currently no timezone support in MicroPython, and the RTC is set in UTC time.

def settime():

t = time()

import machine

tm = utime.gmtime(t + JAPAN_TIME)

machine.RTC().datetime((tm[0], tm[1], tm[2], tm[6] + 1, tm[3], tm[4], tm[5], 0))

フォントはst7789_mpy/fonts/vector/romand.pyをPico Wに保存して使いました。

月別: 2023年6月

MicroPythonでラズパイPico Wと1.69インチTFT DisplayモジュールのNTP時計を作成