Software Bit-banged Protocols

class I2C(Lockable):
    def __init__(self, scl, sda, frequency: int = 400000):
        """
        Initialize software I2C interface.
        
        Parameters:
        - scl: Pin to use for I2C clock line
        - sda: Pin to use for I2C data line  
        - frequency: I2C frequency in Hz (default 400000)
        
        Raises:
        - NotImplementedError: On Pyboard or Linux platforms
        """
    
    def scan(self) -> list[int]:
        """
        Scan I2C bus for connected devices.
        
        Returns:
        List of device addresses found on the bus
        """
    
    def readfrom_into(self, address: int, buffer: bytearray, start: int = 0, end: int = None) -> None:
        """
        Read data from I2C device into existing buffer.
        
        Parameters:
        - address: 7-bit I2C device address
        - buffer: Buffer to read data into
        - start: Starting index in buffer (default 0)
        - end: Ending index in buffer (default None for full buffer)
        """
    
    def writeto(self, address: int, buffer: bytes, start: int = 0, end: int = None, stop: bool = True) -> int:
        """
        Write data to I2C device from buffer.
        
        Parameters:
        - address: 7-bit I2C device address
        - buffer: Data to write
        - start: Starting index in buffer (default 0)
        - end: Ending index in buffer (default None for full buffer)
        - stop: Send I2C stop condition (default True)
        
        Returns:
        Number of bytes written
        """

class SPI(Lockable):
    def __init__(self, clock, MOSI=None, MISO=None):
        """
        Initialize software SPI interface.
        
        Parameters:
        - clock: Pin to use for SPI clock
        - MOSI: Pin to use for Master Out Slave In (optional)
        - MISO: Pin to use for Master In Slave Out (optional)
        
        Raises:
        - NotImplementedError: On Linux platforms
        """
    
    def configure(self, baudrate: int = 100000, polarity: int = 0, phase: int = 0, bits: int = 8) -> None:
        """
        Configure SPI communication parameters.
        
        Parameters:
        - baudrate: SPI clock frequency in Hz (default 100000)
        - polarity: Clock polarity (0 or 1, default 0)
        - phase: Clock phase (0 or 1, default 0)  
        - bits: Bits per transfer (default 8)
        
        Raises:
        - RuntimeError: If try_lock() has not been called
        """
    
    def write(self, buf: bytes) -> None:
        """
        Write data to SPI device.
        
        Parameters:
        - buf: Data buffer to write
        """
    
    def readinto(self, buf: bytearray) -> None:
        """
        Read data from SPI device into buffer.
        
        Parameters:
        - buf: Buffer to read data into
        """
    
    def write_readinto(self, buffer_out: bytes, buffer_in: bytearray) -> None:
        """
        Simultaneously write and read data over SPI.
        
        Parameters:
        - buffer_out: Data to write
        - buffer_in: Buffer to read data into
        """

import bitbangio
import board

# Initialize software I2C
i2c = bitbangio.I2C(board.SCL, board.SDA, frequency=100000)

# Scan for devices
devices = i2c.scan()
print(f"Found devices: {[hex(d) for d in devices]}")

# Read from device
if devices:
    data = bytearray(4)
    i2c.readfrom_into(devices[0], data)
    print(f"Data: {list(data)}")

i2c.deinit()

import bitbangio
import board

# Initialize software SPI
spi = bitbangio.SPI(board.SCLK, MOSI=board.MOSI, MISO=board.MISO)

# Configure SPI parameters
if spi.try_lock():
    try:
        spi.configure(baudrate=1000000, polarity=0, phase=0)
        
        # Write data
        spi.write(b'\x01\x02\x03\x04')
        
        # Read data
        buffer = bytearray(4)
        spi.readinto(buffer)
        print(f"Read: {list(buffer)}")
        
    finally:
        spi.unlock()

spi.deinit()