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https://github.com/logicog/RTLPlayground.git
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70 lines
2.2 KiB
Python
Executable File
70 lines
2.2 KiB
Python
Executable File
#!/usr/bin/env python3
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import time
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import sys
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import argparse
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from smbus2 import SMBus, i2c_msg
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# Configuration
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I2C_BUS = 1
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DEVICE_ADDR = 0x5C # Replace with your device address
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NUM_BYTES = 8 # Bytes to read
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SLEEP_INTERVAL = 1
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# Handle command line arguments for ignored IOs
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IGNORED_IOS = [ ]
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# Setup argument parser
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parser = argparse.ArgumentParser(description='Read I2C data from RTL GPIO expander')
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parser.add_argument('--i2c-bus', '-b', type=int, default=1,
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help='I2C bus number (default: 1)')
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parser.add_argument('--sleep-interval', '-s', type=int, default=2,
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help='Sleep interval in seconds (default: 2)')
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parser.add_argument('--ignored-ios', '-i', nargs='*', type=int, default=[28, 31, 34, 44],
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help='List of GPIO pins to ignore (default: [])')
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args = parser.parse_args()
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I2C_BUS = args.i2c_bus
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SLEEP_INTERVAL = args.sleep_interval
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IGNORED_IOS = args.ignored_ios
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first_read = True
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last_data = [ 0 for x in range(NUM_BYTES) ]
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# Open I2C bus
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with SMBus(I2C_BUS) as bus:
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addr = 0x44
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while True:
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# Create write message (send register address)
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write = i2c_msg.write(DEVICE_ADDR, [addr>>8, addr & 0xff])
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# Create read message (read NUM_BYTES bytes)
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read = i2c_msg.read(DEVICE_ADDR, NUM_BYTES)
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# Perform combined transaction
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bus.i2c_rdwr(write, read)
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new_data = list(read)
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if first_read:
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delta_data = last_data
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first_read = False
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else:
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delta_data = [new_data[x] ^ last_data[x] for x in range(NUM_BYTES)]
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last_data = new_data
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# Convert read message to list
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datastr = " ".join([ f"{x:02x}" for x in new_data])
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deltastr = ""
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chg_list = []
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for x in range(NUM_BYTES):
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if delta_data[x] == 0:
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continue
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for y in range(8):
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if delta_data[x] & ( 1<<y):
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idx = x*8 + y
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if idx not in IGNORED_IOS:
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deltastr += f"\n{' ':8s}GPIO{idx}"
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# deltastr = " ".join([ f"{x:02x}" for x in delta_data])
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print(f"{addr:04x}: {datastr}{deltastr}")
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time.sleep(SLEEP_INTERVAL)
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