from machine import Pin, I2C
from sh1106 import SH1106_I2C
import freesans20
from machine import RTC
from time import sleep_ms
from Writer_minimal import Writer
#import ssd1306

# ESP32 Pin assignment 
i2c = I2C(0, scl=Pin(22), sda=Pin(21), freq=400000)
oled = SH1106_I2C(128, 64, i2c, None, addr=0x3c)
font_writer = Writer(oled, freesans20)


#oled_width = 128
#oled_height = 64
#oled = ssd1306.SSD1306_I2C(oled_width, oled_height, i2c)

rtc = RTC()
rtc.datetime((2024, 1, 10, 9, 00, 0, 0))

isPoint = true

while True:
    t = rtc.datetime()
    oled.fill(0)
    oled.text('** 1.3 OLED **', 4, 0)
    oled.text('Date: {}-{:02d}-{:02d}' .format(t[0],t[1],t[2]), 0,25)
    if isPoint:
        colon = ':'
    else:
        colon = ' '
    oled.text('Time: {:02d}-{:02d}' .format(t[4], colon, t[5]), 0, 40)
    oled.show()
    sleep_ms(500)
   # isPoint = not isPoint
#oled.text('ooo!', 10, 10)      
#oled.show()


main.py

diagram.json

#MicroPython SSD1306 OLED driver, I2C and SPI interfaces created by Adafruit

import time
import framebuf

# register definitions
SET_CONTRAST        = const(0x81)
SET_ENTIRE_ON       = const(0xa4)
SET_NORM_INV        = const(0xa6)
SET_DISP            = const(0xae)
SET_MEM_ADDR        = const(0x20)
SET_COL_ADDR        = const(0x21)
SET_PAGE_ADDR       = const(0x22)
SET_DISP_START_LINE = const(0x40)
SET_SEG_REMAP       = const(0xa0)
SET_MUX_RATIO       = const(0xa8)
SET_COM_OUT_DIR     = const(0xc0)
SET_DISP_OFFSET     = const(0xd3)
SET_COM_PIN_CFG     = const(0xda)
SET_DISP_CLK_DIV    = const(0xd5)
SET_PRECHARGE       = const(0xd9)
SET_VCOM_DESEL      = const(0xdb)
SET_CHARGE_PUMP     = const(0x8d)


class SSD1306:
    def __init__(self, width, height, external_vcc):
        self.width = width
        self.height = height
        self.external_vcc = external_vcc
        self.pages = self.height // 8
        # Note the subclass must initialize self.framebuf to a framebuffer.
        # This is necessary because the underlying data buffer is different
        # between I2C and SPI implementations (I2C needs an extra byte).
        self.poweron()
        self.init_display()

    def init_display(self):
        for cmd in (
            SET_DISP | 0x00, # off
            # address setting
            SET_MEM_ADDR, 0x00, # horizontal
            # resolution and layout
            SET_DISP_START_LINE | 0x00,
            SET_SEG_REMAP | 0x01, # column addr 127 mapped to SEG0
            SET_MUX_RATIO, self.height - 1,
            SET_COM_OUT_DIR | 0x08, # scan from COM[N] to COM0
            SET_DISP_OFFSET, 0x00,
            SET_COM_PIN_CFG, 0x02 if self.height == 32 else 0x12,
            # timing and driving scheme
            SET_DISP_CLK_DIV, 0x80,
            SET_PRECHARGE, 0x22 if self.external_vcc else 0xf1,
            SET_VCOM_DESEL, 0x30, # 0.83*Vcc
            # display
            SET_CONTRAST, 0xff, # maximum
            SET_ENTIRE_ON, # output follows RAM contents
            SET_NORM_INV, # not inverted
            # charge pump
            SET_CHARGE_PUMP, 0x10 if self.external_vcc else 0x14,
            SET_DISP | 0x01): # on
            self.write_cmd(cmd)
        self.fill(0)
        self.show()

    def poweroff(self):
        self.write_cmd(SET_DISP | 0x00)

    def contrast(self, contrast):
        self.write_cmd(SET_CONTRAST)
        self.write_cmd(contrast)

    def invert(self, invert):
        self.write_cmd(SET_NORM_INV | (invert & 1))

    def show(self):
        x0 = 0
        x1 = self.width - 1
        if self.width == 64:
            # displays with width of 64 pixels are shifted by 32
            x0 += 32
            x1 += 32
        self.write_cmd(SET_COL_ADDR)
        self.write_cmd(x0)
        self.write_cmd(x1)
        self.write_cmd(SET_PAGE_ADDR)
        self.write_cmd(0)
        self.write_cmd(self.pages - 1)
        self.write_framebuf()

    def fill(self, col):
        self.framebuf.fill(col)

    def pixel(self, x, y, col):
        self.framebuf.pixel(x, y, col)

    def scroll(self, dx, dy):
        self.framebuf.scroll(dx, dy)

    def text(self, string, x, y, col=1):
        self.framebuf.text(string, x, y, col)


class SSD1306_I2C(SSD1306):
    def __init__(self, width, height, i2c, addr=0x3c, external_vcc=False):
        self.i2c = i2c
        self.addr = addr
        self.temp = bytearray(2)
        # Add an extra byte to the data buffer to hold an I2C data/command byte
        # to use hardware-compatible I2C transactions.  A memoryview of the
        # buffer is used to mask this byte from the framebuffer operations
        # (without a major memory hit as memoryview doesn't copy to a separate
        # buffer).
        self.buffer = bytearray(((height // 8) * width) + 1)
        self.buffer[0] = 0x40  # Set first byte of data buffer to Co=0, D/C=1
        self.framebuf = framebuf.FrameBuffer1(memoryview(self.buffer)[1:], width, height)
        super().__init__(width, height, external_vcc)

    def write_cmd(self, cmd):
        self.temp[0] = 0x80 # Co=1, D/C#=0
        self.temp[1] = cmd
        self.i2c.writeto(self.addr, self.temp)

    def write_framebuf(self):
        # Blast out the frame buffer using a single I2C transaction to support
        # hardware I2C interfaces.
        self.i2c.writeto(self.addr, self.buffer)

    def poweron(self):
        pass


class SSD1306_SPI(SSD1306):
    def __init__(self, width, height, spi, dc, res, cs, external_vcc=False):
        self.rate = 10 * 1024 * 1024
        dc.init(dc.OUT, value=0)
        res.init(res.OUT, value=0)
        cs.init(cs.OUT, value=1)
        self.spi = spi
        self.dc = dc
        self.res = res
        self.cs = cs
        self.buffer = bytearray((height // 8) * width)
        self.framebuf = framebuf.FrameBuffer1(self.buffer, width, height)
        super().__init__(width, height, external_vcc)

    def write_cmd(self, cmd):
        self.spi.init(baudrate=self.rate, polarity=0, phase=0)
        self.cs.high()
        self.dc.low()
        self.cs.low()
        self.spi.write(bytearray([cmd]))
        self.cs.high()

    def write_framebuf(self):
        self.spi.init(baudrate=self.rate, polarity=0, phase=0)
        self.cs.high()
        self.dc.high()
        self.cs.low()
        self.spi.write(self.buffer)
        self.cs.high()

    def poweron(self):
        self.res.high()
        time.sleep_ms(1)
        self.res.low()
        time.sleep_ms(10)
        self.res.high()


ssd1306.py

#
# MicroPython SH1106 OLED driver, I2C and SPI interfaces
#
# The MIT License (MIT)
#
# Copyright (c) 2016 Radomir Dopieralski (@deshipu),
#               2017-2021 Robert Hammelrath (@robert-hh)
#               2021 Tim Weber (@scy)
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
# Sample code sections for ESP8266 pin assignments
# ------------ SPI ------------------
# Pin Map SPI
#   - 3v - xxxxxx   - Vcc
#   - G  - xxxxxx   - Gnd
#   - D7 - GPIO 13  - Din / MOSI fixed
#   - D5 - GPIO 14  - Clk / Sck fixed
#   - D8 - GPIO 4   - CS (optional, if the only connected device)
#   - D2 - GPIO 5   - D/C
#   - D1 - GPIO 2   - Res
#
# for CS, D/C and Res other ports may be chosen.
#
# from machine import Pin, SPI
# import sh1106

# spi = SPI(1, baudrate=1000000)
# display = sh1106.SH1106_SPI(128, 64, spi, Pin(5), Pin(2), Pin(4))
# display.sleep(False)
# display.fill(0)
# display.text('Testing 1', 0, 0, 1)
# display.show()
#
# --------------- I2C ------------------
#
# Pin Map I2C
#   - 3v - xxxxxx   - Vcc
#   - G  - xxxxxx   - Gnd
#   - D2 - GPIO 5   - SCK / SCL
#   - D1 - GPIO 4   - DIN / SDA
#   - D0 - GPIO 16  - Res
#   - G  - xxxxxx     CS
#   - G  - xxxxxx     D/C
#
# Pin's for I2C can be set almost arbitrary
#
# from machine import Pin, I2C
# import sh1106
#
# i2c = I2C(scl=Pin(5), sda=Pin(4), freq=400000)
# display = sh1106.SH1106_I2C(128, 64, i2c, Pin(16), 0x3c)
# display.sleep(False)
# display.fill(0)
# display.text('Testing 1', 0, 0, 1)
# display.show()

from micropython import const
import utime as time
import framebuf


# a few register definitions
_SET_CONTRAST        = const(0x81)
_SET_NORM_INV        = const(0xa6)
_SET_DISP            = const(0xae)
_SET_SCAN_DIR        = const(0xc0)
_SET_SEG_REMAP       = const(0xa0)
_LOW_COLUMN_ADDRESS  = const(0x00)
_HIGH_COLUMN_ADDRESS = const(0x10)
_SET_PAGE_ADDRESS    = const(0xB0)


class SH1106(framebuf.FrameBuffer):

    def __init__(self, width, height, external_vcc, rotate=0):
        self.width = width
        self.height = height
        self.external_vcc = external_vcc
        self.flip_en = rotate == 180 or rotate == 270
        self.rotate90 = rotate == 90 or rotate == 270
        self.pages = self.height // 8
        self.bufsize = self.pages * self.width
        self.renderbuf = bytearray(self.bufsize)
        self.pages_to_update = 0

        if self.rotate90:
            self.displaybuf = bytearray(self.bufsize)
            # HMSB is required to keep the bit order in the render buffer
            # compatible with byte-for-byte remapping to the display buffer,
            # which is in VLSB. Else we'd have to copy bit-by-bit!
            super().__init__(self.renderbuf, self.height, self.width,
                             framebuf.MONO_HMSB)
        else:
            self.displaybuf = self.renderbuf
            super().__init__(self.renderbuf, self.width, self.height,
                             framebuf.MONO_VLSB)

        # flip() was called rotate() once, provide backwards compatibility.
        self.rotate = self.flip
        self.init_display()

    def init_display(self):
        self.reset()
        self.fill(0)
        self.show()
        self.poweron()
        # rotate90 requires a call to flip() for setting up.
        self.flip(self.flip_en)

    def poweroff(self):
        self.write_cmd(_SET_DISP | 0x00)

    def poweron(self):
        self.write_cmd(_SET_DISP | 0x01)
        if self.delay:
            time.sleep_ms(self.delay)

    def flip(self, flag=None, update=True):
        if flag is None:
            flag = not self.flip_en
        mir_v = flag ^ self.rotate90
        mir_h = flag
        self.write_cmd(_SET_SEG_REMAP | (0x01 if mir_v else 0x00))
        self.write_cmd(_SET_SCAN_DIR | (0x08 if mir_h else 0x00))
        self.flip_en = flag
        if update:
            self.show(True) # full update

    def sleep(self, value):
        self.write_cmd(_SET_DISP | (not value))

    def contrast(self, contrast):
        self.write_cmd(_SET_CONTRAST)
        self.write_cmd(contrast)

    def invert(self, invert):
        self.write_cmd(_SET_NORM_INV | (invert & 1))

    def show(self, full_update = False):
        # self.* lookups in loops take significant time (~4fps).
        (w, p, db, rb) = (self.width, self.pages,
                          self.displaybuf, self.renderbuf)
        if self.rotate90:
            for i in range(self.bufsize):
                db[w * (i % p) + (i // p)] = rb[i]
        if full_update:
            pages_to_update = (1 << self.pages) - 1
        else:
            pages_to_update = self.pages_to_update
        #print("Updating pages: {:08b}".format(pages_to_update))
        for page in range(self.pages):
            if (pages_to_update & (1 << page)):
                self.write_cmd(_SET_PAGE_ADDRESS | page)
                self.write_cmd(_LOW_COLUMN_ADDRESS | 2)
                self.write_cmd(_HIGH_COLUMN_ADDRESS | 0)
                self.write_data(db[(w*page):(w*page+w)])
        self.pages_to_update = 0

    def pixel(self, x, y, color=None):
        if color is None:
            return super().pixel(x, y)
        else:
            super().pixel(x, y , color)
            page = y // 8
            self.pages_to_update |= 1 << page

    def text(self, text, x, y, color=1):
        super().text(text, x, y, color)
        self.register_updates(y, y+7)

    def line(self, x0, y0, x1, y1, color):
        super().line(x0, y0, x1, y1, color)
        self.register_updates(y0, y1)

    def hline(self, x, y, w, color):
        super().hline(x, y, w, color)
        self.register_updates(y)

    def vline(self, x, y, h, color):
        super().vline(x, y, h, color)
        self.register_updates(y, y+h-1)

    def fill(self, color):
        super().fill(color)
        self.pages_to_update = (1 << self.pages) - 1

    def blit(self, fbuf, x, y, key=-1, palette=None):
        super().blit(fbuf, x, y, key, palette)
        self.register_updates(y, y+self.height)

    def scroll(self, x, y):
        # my understanding is that scroll() does a full screen change
        super().scroll(x, y)
        self.pages_to_update =  (1 << self.pages) - 1

    def fill_rect(self, x, y, w, h, color):
        super().fill_rect(x, y, w, h, color)
        self.register_updates(y, y+h-1)

    def rect(self, x, y, w, h, color):
        super().rect(x, y, w, h, color)
        self.register_updates(y, y+h-1)

    def register_updates(self, y0, y1=None):
        # this function takes the top and optional bottom address of the changes made
        # and updates the pages_to_change list with any changed pages
        # that are not yet on the list
        start_page = max(0, y0 // 8)
        end_page = max(0, y1 // 8) if y1 is not None else start_page
        # rearrange start_page and end_page if coordinates were given from bottom to top
        if start_page > end_page:
            start_page, end_page = end_page, start_page
        for page in range(start_page, end_page+1):
            self.pages_to_update |= 1 << page

    def reset(self, res):
        if res is not None:
            res(1)
            time.sleep_ms(1)
            res(0)
            time.sleep_ms(20)
            res(1)
            time.sleep_ms(20)


class SH1106_I2C(SH1106):
    def __init__(self, width, height, i2c, res=None, addr=0x3c,
                 rotate=0, external_vcc=False, delay=0):
        self.i2c = i2c
        self.addr = addr
        self.res = res
        self.temp = bytearray(2)
        self.delay = delay
        if res is not None:
            res.init(res.OUT, value=1)
        super().__init__(width, height, external_vcc, rotate)

    def write_cmd(self, cmd):
        self.temp[0] = 0x80  # Co=1, D/C#=0
        self.temp[1] = cmd
        self.i2c.writeto(self.addr, self.temp)

    def write_data(self, buf):
        self.i2c.writeto(self.addr, b'\x40'+buf)

    def reset(self):
        super().reset(self.res)


class SH1106_SPI(SH1106):
    def __init__(self, width, height, spi, dc, res=None, cs=None,
                 rotate=0, external_vcc=False, delay=0):
        dc.init(dc.OUT, value=0)
        if res is not None:
            res.init(res.OUT, value=0)
        if cs is not None:
            cs.init(cs.OUT, value=1)
        self.spi = spi
        self.dc = dc
        self.res = res
        self.cs = cs
        self.delay = delay
        super().__init__(width, height, external_vcc, rotate)

    def write_cmd(self, cmd):
        if self.cs is not None:
            self.cs(1)
            self.dc(0)
            self.cs(0)
            self.spi.write(bytearray([cmd]))
            self.cs(1)
        else:
            self.dc(0)
            self.spi.write(bytearray([cmd]))

    def write_data(self, buf):
        if self.cs is not None:
            self.cs(1)
            self.dc(1)
            self.cs(0)
            self.spi.write(buf)
            self.cs(1)
        else:
            self.dc(1)
            self.spi.write(buf)

    def reset(self):
        super().reset(self.res)