old ssd1306.py library file on MicroPython ESP8266 board #7

ssd1306.py

"""
This is a MicroPython driver for the SSD1306 OLED display.

The driver implements both the I2C and SPI interfaces, as the SSD1306 is available with either interface.
"""

# MicroPython SSD1306 OLED driver, I2C and SPI interfaces
from micropython import const

import time
import framebuf
import sys



currentBoard=""
if(sys.platform=="esp8266"):
    currentBoard="esp8266"
elif(sys.platform=="esp32"):
    currentBoard="esp32"
elif(sys.platform=="wipy"):
    currentBoard="wipy"
elif(sys.platform=="pyboard"):
    currentBoard="pyboard"
    import pyb



# 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
        self.buffer = bytearray(self.pages * self.width)
        self.framebuf = framebuf.FrameBuffer(self.buffer, self.width, self.height, framebuf.MVLSB)
        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_data(self.buffer)

    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)

    def hline(self, x, y, w, col):
        self.framebuf.hline(x, y, w, col)

    def vline(self, x, y, h, col):
        self.framebuf.vline(x, y, h, col)

    def line(self, x1, y1, x2, y2, col):
        self.framebuf.line(x1, y1, x2, y2, col)

    def rect(self, x, y, w, h, col):
        self.framebuf.rect(x, y, w, h, col)

    def fill_rect(self, x, y, w, h, col):
        self.framebuf.fill_rect(x, y, w, h, col)

    def blit(self, fbuf, x, y):
        self.framebuf.blit(fbuf, x, y)



class SSD1306_I2C(SSD1306, i2cAddress):
    def __init__(self, width, height, i2c, addr=i2cAddress, external_vcc=False):
        self.i2c = i2c
        self.addr = addr
        self.temp = bytearray(2)
        super().__init__(width, height, external_vcc)

    def write_cmd(self, cmd):
        self.temp[0] = 0x80 # Co=1, D/C#=0
        self.temp[1] = cmd
        # IF SYS  :
        global currentBoard
        if currentBoard=="esp8266" or currentBoard=="esp32":
            self.i2c.writeto(self.addr, self.temp)
        elif currentBoard=="pyboard":
            self.i2c.send(self.temp, self.addr)
        # ELSE:

    def write_data(self, buf):
        self.temp[0] = self.addr << 1
        self.temp[1] = 0x40 # Co=0, D/C#=1
        global currentBoard
        if currentBoard=="esp8266" or currentBoard=="esp32":
            self.i2c.start()
            self.i2c.write(self.temp)
            self.i2c.write(buf)
            self.i2c.stop()
        elif currentBoard=="pyboard":
            # self.i2c.send(self.temp,self.addr)
            # self.i2c.send(buf,self.addr)
            self.i2c.mem_write(buf,self.addr,0x40)

    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
        super().__init__(width, height, external_vcc)

    def write_cmd(self, cmd):
        global currentBoard
        if currentBoard=="esp8266" or currentBoard=="esp32":
            self.spi.init(baudrate=self.rate, polarity=0, phase=0)
        elif currentBoard=="pyboard":
            self.spi.init(mode = pyb.SPI.MASTER,baudrate=self.rate, polarity=0, phase=0)
        self.cs.high()
        self.dc.low()
        self.cs.low()
        global currentBoard
        if currentBoard=="esp8266" or currentBoard=="esp32":
            self.spi.write(bytearray([cmd]))
        elif currentBoard=="pyboard":
            self.spi.send(bytearray([cmd]))
        self.cs.high()

    def write_data(self, buf):
        global currentBoard
        if currentBoard=="esp8266" or currentBoard=="esp32":
            self.spi.init(baudrate=self.rate, polarity=0, phase=0)
        elif currentBoard=="pyboard":
            self.spi.init(mode = pyb.SPI.MASTER,baudrate=self.rate, polarity=0, phase=0)
        self.cs.high()
        self.dc.high()
        self.cs.low()
        global currentBoard
        if currentBoard=="esp8266" or currentBoard=="esp32":
            self.spi.write(buf)
        elif currentBoard=="pyboard":
            self.spi.send(buf)
        self.cs.high()

    def poweron(self):
        self.res.high()
        time.sleep_ms(1)
        self.res.low()
        time.sleep_ms(10)
        self.res.high()