add utilities for led and gpio dump and detection

2026-08-30 14:52:51 +08:00 · 2026-06-21 13:04:04 -05:00
parent f122402bdd
commit ebc6cd06ad
4 changed files with 340 additions and 0 deletions
@@ -0,0 +1,69 @@
+#!/usr/bin/env python3
+
+import time
+import sys
+import argparse
+from smbus2 import SMBus, i2c_msg
+
+# Configuration
+I2C_BUS = 1
+DEVICE_ADDR = 0x5C  # Replace with your device address
+NUM_BYTES = 8       # Bytes to read
+SLEEP_INTERVAL = 2
+
+# Handle command line arguments for ignored IOs
+IGNORED_IOS = [ 28, 31, 34, 44]
+
+# Setup argument parser
+parser = argparse.ArgumentParser(description='Read I2C data from RTL GPIO expander')
+parser.add_argument('--i2c-bus', '-b', type=int, default=1,
+                    help='I2C bus number (default: 1)')
+parser.add_argument('--sleep-interval', '-s', type=int, default=2,
+                    help='Sleep interval in seconds (default: 2)')
+parser.add_argument('--ignored-ios', '-i', nargs='*', type=int, default=[28, 31, 34, 44],
+                    help='List of GPIO pins to ignore (default: [28, 31, 34, 44])')
+args = parser.parse_args()
+I2C_BUS = args.i2c_bus
+SLEEP_INTERVAL = args.sleep_interval
+IGNORED_IOS = args.ignored_ios
+
+first_read = True
+last_data = [ 0 for x in range(NUM_BYTES) ]
+
+# Open I2C bus
+with SMBus(I2C_BUS) as bus:
+    addr = 0x44
+
+    while True:
+        # Create write message (send register address)
+        write = i2c_msg.write(DEVICE_ADDR, [addr>>8, addr & 0xff])
+    
+        # Create read message (read NUM_BYTES bytes)
+        read = i2c_msg.read(DEVICE_ADDR, NUM_BYTES)
+    
+        # Perform combined transaction
+        bus.i2c_rdwr(write, read)
+    
+        new_data = list(read)
+        if first_read:
+            delta_data = last_data
+            first_read = False
+        else:
+            delta_data = [new_data[x] ^ last_data[x] for x in range(NUM_BYTES)]
+        last_data = new_data
+        
+        # Convert read message to list
+        datastr = " ".join([ f"{x:02x}" for x in new_data])
+        deltastr = ""
+        chg_list = []
+        for x in range(NUM_BYTES):
+            if delta_data[x] == 0:
+                continue
+            for y in range(8):
+                if delta_data[x] & ( 1<<y):
+                    idx = x*8 + y
+                    if idx not in IGNORED_IOS:
+                        deltastr += f"\n{'  ':8s}GPIO{idx}"
+        # deltastr = " ".join([ f"{x:02x}" for x in delta_data])
+        print(f"{addr:04x}: {datastr}{deltastr}")
+        time.sleep(SLEEP_INTERVAL)