树莓派pico驱动1306屏幕（micro python）

一、库文件

前往GitHubhttps://github.com/sraxc/public_1/tree/main/ssd1306py

一共有两个文件，是在jdhxyy 的源代码上修改得来的，

目前已测试MicroPython v1.20.0 on 2023-04-26 可以正常使用。

---

 ops.py：

import machine
import ssd1306py.ssd1306 as ssd1306
import math

_oled = None
_i2c = None
_width = 0
_height = 0


def init_i2c(scl, sda, width, height, i2c=1):
    """
    初始化i2c接口
    :param scl: i2c的时钟脚
    :param sda: i2c的数据脚
    :param width: oled屏幕的宽度像素
    :param height: oled屏幕的高度像素
    :param i2c: i2c口
    """
    global _oled, _width, _height
    _i2c = machine.I2C(i2c, scl=machine.Pin(scl), sda=machine.Pin(sda))
    _width = width
    _height = height
    _oled = ssd1306.SSD1306_I2C(_width, _height, _i2c)


def clear():
    """清除屏幕"""
    global _oled
    _oled.fill(0)


def show():
    """屏幕刷新显示"""
    global _oled
    _oled.show()


def pixel(x, y,value=1):
    """画点"""
    global _oled
    _oled.pixel(x, y, value)


def text(string, x_axis, y_axis):
    """显示字符串.注意字符串必须是英文或者数字"""
    global _oled
    _oled.text(string, x_axis, y_axis)
    return

def line_se(x_start,y_start,x_end,y_end):
    """画直线"""
    #垂直于x
    if x_start == x_end and y_start <= y_end:
        for i in range(y_start,y_end):
            pixel(x_start,i)
    elif x_start == x_end and y_start > y_end:
        for i in range(y_end,y_start):
            pixel(x_start,i)
    #垂直于y
    elif y_start == y_end and x_start <= x_end:
        for i in range(x_start,x_end):
            pixel(i,y_start)
    elif y_start == y_end and x_start > x_end:
        for i in range(x_end,x_start):
            pixel(i,y_start)
    elif x_end > x_start:
        dx = x_end - x_start
        dy = y_end - y_start
        k = dy / dx
        for x in range(x_start,x_end):
            y = round(k*x + x_start)
            pixel(x,y)
    elif x_end < x_start:
        x_start,x_end = x_end,x_start
        y_start,y_end = y_end,y_start
        dx = x_end - x_start
        dy = y_end - y_start
        k = dy / dx
        for x in range(x_start,x_end):
            y = round(k*x + x_start)
            pixel(x,y)
    else:
        pass
def matrix_2(lists,x_length,x=1,y=1):
    """二进制"""
    nx = int(1)
    ny = int(1)
    for i in lists:
        pixel(x+nx,y+ny,int(i))
        nx += 1
        if nx > int(x_length):
            nx = int(1)
            ny += 1
def tobin(value,length=8):
    v = str(bin(eval(value)))[2:]
    while len(v) < length:
        v = "0" + v
    return(v)
def matrix(lists,length,x=1,y=1):
    """画字符"""
    m = ""
    for i in lists:
        m += str(tobin(i,8))
    matrix_2(m,length,x,y)
def rounds(r,x,y,x_flex,y_flex):
    """画圆"""
    for i in range(0,6.29*100):
        nx = above(int(x) + eval(x_flex) * eval(r) * math.cos(i/100))
        ny = above(int(y) + eval(y_flex) * eval(r) * math.sin(i/100))
        pixel(nx,ny)
def square(x,y,x_length,y_length):
    """画矩形"""
    for i in range(0,int(x_length)):
        for n in range(0,int(ylength)):
            pixel(int(x) + i,int(y) + n)

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()

 二、导入

先在树莓派pico里面建一个文件夹，命名为ssd1306py，在这个文件夹里放前面的两个文件

然后在新建一个文件，导入库：（以经典的hello world为例）

from machine import *
import ssd1306py.ops as lcd

lcd.init_i2c(3, 2, 128, 64)
lcd.text('Hello world!', 0, 0)
lcd.show()

def init_i2c(scl, sda, width, height, i2c=1):
    """
    初始化i2c接口
    :param scl: i2c的时钟脚
    :param sda: i2c的数据脚
    :param width: oled屏幕的宽度像素
    :param height: oled屏幕的高度像素
    :param i2c: i2c口
    """