Troubleshooting • I2C address conflict with concurrent calls on separate buses

Code:

python3 detectI2cGhosts.py 10 0

Code:

python3 detectI2cGhosts.py 5 0

Code:

python3 detectI2cGhosts.py 10,5 0Starting I2C monitoring on buses 10, 5. Press Ctrl+C to exit.Locking enabled: FalseInitializing bus 10...Initial addresses on bus 10: 1b, UUInitializing bus 5...Initial addresses on bus 5: UUChange detected on I2C bus 5:  Addresses added: 0f, 15Change detected on I2C bus 5:  Addresses added: 09, 0b, 0d, 10, 13, 18, 1c  Addresses removed: 0fChange detected on I2C bus 5:  Addresses removed: 09, 0b, 0d, 10, 13, 15, 18, 1cChange detected on I2C bus 5:  Addresses added: 09, 0b, 12, 19

Code:

import subprocessimport timeimport osimport sysfrom collections import defaultdictLOCKFILE = '/tmp/i2c_detect.lock'def i2c_detect(bus, use_lock):    """    Run i2cdetect on a specified I2C bus.    If use_lock is True, use flock to ensure exclusive access.    Return the detected addresses as a set.    """    if use_lock:        with open(LOCKFILE, 'w') as lock_file:           result = subprocess.run(['flock', '-x', lock_file.name, '-c', f'i2cdetect -y {bus}'], capture_output=True, text=True, shell=True)    else:        # Construct the command as a single string        command = f'i2cdetect -y {bus} > /tmp/i2c_{bus}.out'        result = subprocess.run(['i2cdetect', '-y', str(bus)], capture_output=True, text=True)        # Read the output from the temporary file    lines = result.stdout.strip().split("\n")[1:]  # Skip the header line    addresses = set()    for line in lines:        parts = line.split()[1:]  # Skip the first column which is row header        for part in parts:            if part != '--':                addresses.add(part)        return addressesdef detect_changes(previous, current):    """    Detect added and removed addresses between two scans.    Returns two sets: added addresses and removed addresses.    """    added = current - previous    removed = previous - current    return added, removeddef main():    if len(sys.argv) < 3:        print("Usage: python3 detect_ghost.py <i2c_bus_numbers> <use_lock>")        print("<i2c_bus_numbers> : Comma-delimited list of I2C bus numbers to scan (e.g., 1,5,10).")        print("<use_lock> : 1 to use the lock, 0 to not use the lock.")        sys.exit(1)    buses = [int(bus) for bus in sys.argv[1].split(',')]    use_lock = bool(int(sys.argv[2]))    scan_interval = 0.1  # 100 ms    print(f"Starting I2C monitoring on buses {', '.join(map(str, buses))}. Press Ctrl+C to exit.")    print(f"Locking enabled: {use_lock}")        # Initialize previous state for each bus    previous_state = {}    for bus in buses:        print(f"Initializing bus {bus}...")        previous_state[bus] = i2c_detect(bus, use_lock)        print(f"Initial addresses on bus {bus}: {', '.join(sorted(previous_state[bus])) if previous_state[bus] else 'None'}")        try:        while True:            for bus in buses:                current_addresses = i2c_detect(bus, use_lock)                added, removed = detect_changes(previous_state[bus], current_addresses)                                if added or removed:                    print(f"\nChange detected on I2C bus {bus}:")                    if added:                        added_sorted = ', '.join(sorted(added))                        print(f"  Addresses added: {added_sorted}")                    if removed:                        removed_sorted = ', '.join(sorted(removed))                        print(f"  Addresses removed: {removed_sorted}")                                        # Update the previous state                    previous_state[bus] = current_addresses            time.sleep(scan_interval)    except KeyboardInterrupt:        print("\nI2C monitoring stopped by user.")if __name__ == "__main__":    main()

Code:

// SPDX-License-Identifier: GPL-2.0-only// Definitions for IMX258 camera module on VC I2C bus/dts-v1/;/plugin/;#include <dt-bindings/gpio/gpio.h>/{compatible = "brcm,bcm2835";clk_frag_0: fragment@30 {target = <&cam0_clk>;cam_clk_0: __overlay__ {clock-frequency = <24000000>;status = "okay";};};clk_frag_1: fragment@31 {target = <&cam1_clk>;cam_clk_1: __overlay__ {clock-frequency = <24000000>;status = "okay";};};fragment@1 {target = <&i2c5>;__overlay__ {status = "okay";brcm,pins = <10 11>;};};fragment@3 {target = <&i2c0if>;__overlay__ {status = "okay";};};fragment@4 { target = <&i2c0mux>;__overlay__ {status = "okay";};};reg_frag_0: fragment@6 {target = <&cam0_reg>;cam_reg_0: __overlay__ {regulator-name = "imx258_vana";startup-delay-us = <300000>;regulator-min-microvolt = <1800000>;regulator-max-microvolt = <1800000>;};};reg_frag_1: fragment@7 {target = <&cam1_reg>;cam_reg_1: __overlay__ {regulator-name = "imx258_vana";startup-delay-us = <300000>;regulator-min-microvolt = <1800000>;regulator-max-microvolt = <1800000>;};};cam_left: fragment@100 {target = <&i2c_csi_dsi>;__overlay__ {#address-cells = <1>;#size-cells = <0>;status = "okay";imx258_cam_0: imx258@10 {compatible = "sony,imx258-pdaf";reg = <0x1A>;status = "okay";clocks = <&cam0_clk>;clock-names = "xclk";vana-supply = <&cam0_reg>;/* 2.8v */vdig-supply = <&cam_dummy_reg>;/* 1.05v */vif-supply = <&cam_dummy_reg>;/* 1.8v */rotation = <0>;orientation = <2>;port {imx258_0: endpoint {remote-endpoint = <&csi_ep_0>;clock-lanes = <0>;clock-noncontinuous;link-frequencies =/bits/ 64 <633600000320000000>;};};};vcm_cam_0: ad5398@c {compatible = "adi,ad5398";reg = <0x0c>;status = "disabled";VANA-supply = <&cam0_reg>;};};};cam_right: fragment@110 {target = <&i2c5>;__overlay__ {#address-cells = <1>;#size-cells = <0>;status = "okay";imx258_cam_1: imx258@5 {compatible = "sony,imx258-pdaf";reg = <0x1A>;status = "okay";clocks = <&cam1_clk>;clock-names = "xclk";vana-supply = <&cam1_reg>;/* 2.8v */vdig-supply = <&cam_dummy_reg>;/* 1.05v */vif-supply = <&cam_dummy_reg>;/* 1.8v */rotation = <0>;orientation = <2>;port {imx258_1: endpoint {remote-endpoint = <&csi_ep_1>;clock-lanes = <0>;clock-noncontinuous;link-frequencies =/bits/ 64 <633600000320000000>;};};};vcm_cam_1: ad5398@c {compatible = "adi,ad5398";reg = <0x0c>;status = "disabled";VANA-supply = <&cam1_reg>;};};};csi_0_frag: fragment@101 {target = <&csi0>;csi_0: __overlay__ {status = "okay";brcm,media-controller;port {csi_ep_0: endpoint {remote-endpoint = <&imx258_0>;clock-lanes = <0>;clock-noncontinuous;};};};};csi_1_frag: fragment@111 {target = <&csi1>;csi_1: __overlay__ {status = "okay";brcm,media-controller;port {csi_ep_1: endpoint {remote-endpoint = <&imx258_1>;clock-lanes = <0>;clock-noncontinuous;};};};};fragment@102 {target = <&imx258_0>;__overlay__ {data-lanes = <1 2>;link-frequencies = /bits/ 64 <633600000      320000000>;};};fragment@112 {target = <&imx258_1>;__overlay__ {data-lanes = <1 2 3 4>;link-frequencies = /bits/ 64 <633600000      320000000>;};};fragment@113 {target = <&imx258_1>;__dormant__ {data-lanes = <1 2 3 4>;link-frequencies =/bits/ 64 <633600000 320000000>;};};fragment@104 {target = <&csi_ep_0>;__overlay__ {data-lanes = <1 2>;};};fragment@114 {target = <&csi_ep_1>;__overlay__ {data-lanes = <1 2 3 4>;};};fragment@115 {target = <&csi_ep_1>;__dormant__ {data-lanes = <1 2 3 4>;};};__overrides__ {rotation = <&imx258_cam_1>,"rotation:0",<&imx258_cam_0>,"rotation:0";orientation = <&imx258_cam_1>,"orientation:0",<&imx258_cam_0>,"orientation:0";/*oldboard = <&i2c_frag_5>, "target:0=",<&i2c_vc>;       <&csi_0_frag>, "target:0=",<&csi0>,       <&clk_frag_0>, "target:0=",<&cam0_clk>,       <&reg_frag_0>, "target:0=",<&cam0_reg>,       <&imx258_cam_0>, "clocks:0=",<&cam0_clk>,       <&imx258_cam_0>, "vana-supply:0=",<&cam0_reg>;vcm = <&vcm_cam_0>, "status=okay",      <&imx258_cam_0>,"lens-focus:0=", <&vcm_cam_0>;4lane = <0>, "-102+103-104+105";*/};};

Code:

# Run in 64-bit modearm_64bit=1arm_boost=1#enable Antenna externaldtparam=ant2# Add support for software i2c on gpio pinsdtoverlay=i2c5,pins_10_11#add gpu memory for image processinggpu_mem=256#add the camera overlaydtoverlay=imx258_i2c5,rotation=180#shutdown button setupgpio=9=ip,np#other hardware on  gpio=19=op,np,dh#buttongpio=18=ip,np#disable bluetoothdtoverlay=disable-bt