1186e61588
MicroPython sim that runs on https://wokwi.com/pi-pico: KY-040 encoder stands in for the thumb-roller (rotate=tempo, press=start/stop, hold+rotate=track), an SSD1306 OLED for the display, and a piezo buzzer for the click. Files: diagram.json, main.py, ssd1306.py + README with the (manual) setup steps. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
101 lines
3.1 KiB
Python
101 lines
3.1 KiB
Python
# MicroPython SSD1306 OLED driver, I2C interface (from micropython-lib, MIT licence).
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# Bundled here so the project runs with no extra installs.
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from micropython import const
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import framebuf
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SET_CONTRAST = const(0x81)
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SET_ENTIRE_ON = const(0xA4)
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SET_NORM_INV = const(0xA6)
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SET_DISP = const(0xAE)
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SET_MEM_ADDR = const(0x20)
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SET_COL_ADDR = const(0x21)
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SET_PAGE_ADDR = const(0x22)
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SET_DISP_START_LINE = const(0x40)
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SET_SEG_REMAP = const(0xA0)
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SET_MUX_RATIO = const(0xA8)
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SET_COM_OUT_DIR = const(0xC0)
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SET_DISP_OFFSET = const(0xD3)
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SET_COM_PIN_CFG = const(0xDA)
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SET_DISP_CLK_DIV = const(0xD5)
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SET_PRECHARGE = const(0xD9)
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SET_VCOM_DESEL = const(0xDB)
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SET_CHARGE_PUMP = const(0x8D)
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class SSD1306(framebuf.FrameBuffer):
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def __init__(self, width, height, external_vcc):
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self.width = width
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self.height = height
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self.external_vcc = external_vcc
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self.pages = self.height // 8
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self.buffer = bytearray(self.pages * self.width)
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super().__init__(self.buffer, self.width, self.height, framebuf.MONO_VLSB)
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self.init_display()
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def init_display(self):
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for cmd in (
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SET_DISP | 0x00,
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SET_MEM_ADDR, 0x00,
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SET_DISP_START_LINE | 0x00,
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SET_SEG_REMAP | 0x01,
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SET_MUX_RATIO, self.height - 1,
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SET_COM_OUT_DIR | 0x08,
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SET_DISP_OFFSET, 0x00,
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SET_COM_PIN_CFG, 0x02 if self.height == 32 else 0x12,
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SET_DISP_CLK_DIV, 0x80,
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SET_PRECHARGE, 0x22 if self.external_vcc else 0xF1,
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SET_VCOM_DESEL, 0x30,
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SET_CONTRAST, 0xFF,
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SET_ENTIRE_ON,
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SET_NORM_INV,
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SET_CHARGE_PUMP, 0x10 if self.external_vcc else 0x14,
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SET_DISP | 0x01,
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):
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self.write_cmd(cmd)
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self.fill(0)
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self.show()
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def poweroff(self):
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self.write_cmd(SET_DISP | 0x00)
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def poweron(self):
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self.write_cmd(SET_DISP | 0x01)
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def contrast(self, contrast):
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self.write_cmd(SET_CONTRAST)
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self.write_cmd(contrast)
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def invert(self, invert):
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self.write_cmd(SET_NORM_INV | (invert & 1))
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def show(self):
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x0 = 0
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x1 = self.width - 1
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if self.width == 64:
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x0 += 32
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x1 += 32
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self.write_cmd(SET_COL_ADDR)
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self.write_cmd(x0)
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self.write_cmd(x1)
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self.write_cmd(SET_PAGE_ADDR)
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self.write_cmd(0)
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self.write_cmd(self.pages - 1)
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self.write_data(self.buffer)
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class SSD1306_I2C(SSD1306):
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def __init__(self, width, height, i2c, addr=0x3C, external_vcc=False):
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self.i2c = i2c
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self.addr = addr
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self.temp = bytearray(2)
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self.write_list = [b"\x40", None]
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super().__init__(width, height, external_vcc)
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def write_cmd(self, cmd):
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self.temp[0] = 0x80
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self.temp[1] = cmd
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self.i2c.writeto(self.addr, self.temp)
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def write_data(self, buf):
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self.write_list[1] = buf
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self.i2c.writevto(self.addr, self.write_list)
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