71 lines
2.5 KiB
Python
71 lines
2.5 KiB
Python
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#!/usr/bin/env python
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import sys
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import time
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from smbus2 import SMBus, i2c_msg
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def listen_i2c(bus_number, address, register=0x00):
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"""
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Listens for incoming data on the specified I2C address and prints received bytes.
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:param bus_number: I2C bus number (e.g. 1 for /dev/i2c-1)
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:param address: I2C address to listen to (in integer, e.g. 0x48)
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:param register: Register to read from (default 0x00)
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"""
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bus = SMBus(bus_number)
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print(f"Listening on I2C bus {bus_number}, address {hex(address)}, register {hex(register)}")
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try:
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# color = True
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while True:
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try:
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msg = i2c_msg.read(address, 8) # Read 8 bytes!
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bus.i2c_rdwr(msg)
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data = bytes(msg)
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int_list = list(data)
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print(f"Received: {int_list}")
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# Try reading 1 byte from the register
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# data = bus.read_block_data(address, register)
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# print(f"Received: ({data})")
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# if color:
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# msg = i2c_msg.write(address, create_led_color_packet(255, 0, 0))
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# else:
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# msg = i2c_msg.write(address, create_led_color_packet(255, 255, 0))
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#
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# bus.i2c_rdwr(msg)
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# color = not(color)
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# bus.write_i2c_block_data(address, register, create_led_color_packet(255, 0, 0))
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# print("Write")
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except Exception as e:
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print(f"Write error: {e}")
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time.sleep(0.5)
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except KeyboardInterrupt:
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print("Stopped listening.")
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finally:
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bus.close()
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def create_led_color_packet(r, g, b):
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"""
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Create an 8-byte packet to set LED color for I2C transfer.
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Packet format:
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[0x10, 0x00, R, G, B, 0x00, 0x00, checksum]
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- 0x10: Command for LED color
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- 0x00: Target/channel (set as needed)
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- R, G, B: Color bytes (0-255)
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- 0x00, 0x00: Unused
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- checksum: XOR of bytes 0-6
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"""
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packet = [0x10, 0x00, r & 0xFF, g & 0xFF, b & 0xFF, 0x00, 0x00]
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checksum = 0
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for b in packet:
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checksum ^= b
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packet.append(checksum)
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return bytes(packet)
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if __name__ == "__main__":
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if len(sys.argv) < 3:
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print("Usage: python i2c_listener.py <bus_number> <address> [register]")
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print("Example: python i2c_listener.py 1 0x48")
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sys.exit(1)
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bus_number = int(sys.argv[1])
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address = int(sys.argv[2], 0)
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register = int(sys.argv[3], 0) if len(sys.argv) > 3 else 0x00
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listen_i2c(bus_number, address, register)
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