树莓派pico运用MicroPyhton语言i2c通讯驱动ssd1306屏幕

Question

已导入ssd1306.py到pico中上一个提问没有完整的发出此代码，在这里给大家道歉
ssd1306.py如下

# MicroPython SSD1306 OLED driver, I2C and SPI interfaces

from micropython import const
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)

# Subclassing FrameBuffer provides support for graphics primitives
# http://docs.micropython.org/en/latest/pyboard/library/framebuf.html
class SSD1306(framebuf.FrameBuffer):
    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)
        super().__init__(self.buffer, self.width, self.height, framebuf.MONO_VLSB)
        self.init_display(0)

    def init_display(self):
        for cmd in (
            SET_DISP | 0x00, # off
            # address setting
            SET_MEM_ADDR, 0x02,    # Page Addressing Mode
            # 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 poweron(self):
        self.write_cmd(SET_DISP | 0x01)

    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
            
        buffer_mv = memoryview(self.buffer)
        
        for i in range(0,8):
            self.write_cmd(0x02)       # Lower 4-bit,  Column Start Address = 0x02
            self.write_cmd(0x10)       # Higher 4-bit, Column Start Address = 0x02
            self.write_cmd(0xb0 | i)   # 设置页面地址
            self.write_data(buffer_mv[i * 128 : i * 128 + 128])  # 发送一页的数据


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)
        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_data(self, buf):
        self.temp[0] = self.addr << 1
        self.temp[1] = 0x40 # Co=0, D/C#=1
        self.i2c.start()
        self.i2c.write(self.temp)
        self.i2c.write(buf)
        self.i2c.stop()


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
        import time
        self.res(1)
        time.sleep_ms(1)
        self.res(0)
        time.sleep_ms(10)
        self.res(1)
        super().__init__(width, height, external_vcc)

    def write_cmd(self, cmd):
        self.spi.init(baudrate=self.rate, polarity=0, phase=0)
        self.cs(1)
        self.dc(0)
        self.cs(0)
        self.spi.write(bytearray([cmd]))
        self.cs(1)

    def write_data(self, buf):
        self.spi.init(baudrate=self.rate, polarity=0, phase=0)
        self.cs(1)
        self.dc(1)
        self.cs(0)
        self.spi.write(buf)
        self.cs(1）

还有导入i2c_1.py进pico里
i2c_1.py如下

from machine import Pin, SoftI2C
import ssd1306
# 初始化I²C
i2c = SoftI2C(scl=Pin(4), sda=Pin(5))
# SSD1306 OLED 屏幕尺寸为128x64像素
oled_width = 128
oled_height = 64
# 创建SSD1306对象
oled = ssd1306.SSD1306_I2C(oled_width, oled_height, i2c)
# 清屏
oled.fill(0)
oled.show()
# 写入文本
oled.text("Hello, World!", 0, 0)
oled.show()

但是实际运行起来报错，麻烦帮我看看是哪里出错了

Answer 1

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在您提供的代码中，错误出现在ssd1306.py中的初始化函数中。这个错误是因为SSD1306类的__init__方法只接受三个参数：width、height 和 external_vcc，但在调用时提供了四个参数。在i2c_1.py第9行，你需要去掉i2c参数后的逗号。

修复这个问题后，您的代码应该如下所示：

from machine import Pin, SoftI2C
import ssd1306

# 初始化I²C
i2c = SoftI2C(scl=Pin(4), sda=Pin(5))
# SSD1306 OLED 屏幕尺寸为128x64像素
oled_width = 128
oled_height = 64
# 创建SSD1306对象
oled = ssd1306.SSD1306_I2C(oled_width, oled_height, i2c)
# 清屏
oled.fill(0)
oled.show()
# 写入文本
oled.text("Hello, World!", 0, 0)
oled.show()

这段代码应该可以正确地初始化并显示一个带有 "Hello, World!" 文本的 SSD1306 OLED 屏幕。如果您仍然遇到问题，请确保您的硬件连接正确，并且您的Raspberry Pi Pico已经正确安装了必要的库。