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====== OLed ======

* [[https://randomnerdtutorials.com/micropython-oled-display-esp32-esp8266/|MicroPython: OLED Display with ESP32 and ESP8266]]
  * [[https://blog.martinfitzpatrick.com/displaying-images-oled-displays/|Displaying images on OLED screens]]
  * [[https://www.donskytech.com/micropython-interfacing-with-ssd1306-oled-display/|MicroPython: Interfacing with SSD1306 OLED display]]

<file python ssd1306.py>
#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()

</file>

<file python oled.py>
import ssd1306
from machine import SoftI2C, Pin

class OLed:
    def __init__(self, scl, sda):
        self.scl = scl
        self.sda = sda
        
        self.i2c = SoftI2C(scl=Pin(scl), sda=Pin(sda))
        self.oled = ssd1306.SSD1306_I2C(128, 64, self.i2c)        
    
        self.menu_items = ["Profile", "Setup Wifi", "Option 3", "Option 4", "Option 5"]
        self.menu_selected_index = 0
        self.start_index = 0
        self.end_index = min(len(self.menu_items), 6)

def set_message(self, message, x = 0, y = 0, is_fill = True):
        if is_fill:
            self.oled.fill(0)

self.oled.text(message, x, y, 1)
        self.oled.show()

def set_images(self, image_pixels):
        self.oled.fill(0)
        
        line = 0
        for line_pixels in image_pixels:
            column = 0
            for pixel in line_pixels:
                self.oled.pixel(column, line, pixel)

column = column + 1
            
            line = line + 1
            
        self.oled.show()

def display_menu(self, start, end, selected):
        self.oled.fill(0)
        self.set_message("Setting:")
        
        for i in range(start, end):
            y = (i - start) * 10 + 16
            
            if i == selected:
                self.oled.text("-> " + self.menu_items[i], 0, y)
            else:
                self.oled.text(self.menu_items[i], 19, y)
        self.oled.show()
</file>

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