Device Tree • Re: MCP23017 overlay error -EIO: can't write IOCON 32

Code:

cat test.py import smbus2import RPi.GPIO as GPIOimport time# I2C and GPIO setupI2C_BUS = 11  # Typically bus 1 is used on Raspberry PiMCP23017_ADDRESS = 0x20  # Default I2C address for MCP23017INTERRUPT_PIN = 18  # GPIO pin on Raspberry Pi for MCP23017 interrupt# MCP23017 RegistersIODIRA = 0x00  # Direction register for port AIODIRB = 0x01  # Direction register for port BGPINTENA = 0x04  # Interrupt-on-change for port AGPINTENB = 0x05  # Interrupt-on-change for port BDEFVALA = 0x06  # Default compare value for port ADEFVALB = 0x07  # Default compare value for port BINTCONA = 0x08  # Interrupt control for port AINTCONB = 0x09  # Interrupt control for port BGPPUA = 0x0C  # Pull-up resistors for port AGPPUB = 0x0D  # Pull-up resistors for port BGPIOA = 0x12  # GPIO register for port AGPIOB = 0x13  # GPIO register for port BINTFA = 0x0E  # Interrupt flag for port AINTFB = 0x0F  # Interrupt flag for port B# Initialize SMBusi2c = smbus2.SMBus(I2C_BUS)# MCP23017 Configurationdef configure_mcp23017():    # Set all pins on port A as inputs    i2c.write_byte_data(MCP23017_ADDRESS, IODIRA, 0xFF)    # Enable pull-up resistors on port A    i2c.write_byte_data(MCP23017_ADDRESS, GPPUA, 0xFF)    # Enable interrupt-on-change for all pins on port A    i2c.write_byte_data(MCP23017_ADDRESS, GPINTENA, 0xFF)    # Configure interrupts to compare against the previous value    i2c.write_byte_data(MCP23017_ADDRESS, INTCONA, 0x00)# Interrupt Handlerdef handle_interrupt(channel):    # Read interrupt flags    int_flags = i2c.read_byte_data(MCP23017_ADDRESS, INTFA)    # Read current GPIO state    gpio_state = i2c.read_byte_data(MCP23017_ADDRESS, GPIOA)    print(f"Interrupt detected! Flags: {bin(int_flags)}, GPIO state: {bin(gpio_state)}")# GPIO SetupGPIO.setmode(GPIO.BCM)GPIO.setup(INTERRUPT_PIN, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)GPIO.add_event_detect(INTERRUPT_PIN, GPIO.FALLING, callback=handle_interrupt, bouncetime=200)# Main functiondef main():    try:        configure_mcp23017()        print("MCP23017 configured. Waiting for interrupts...")        while True:            time.sleep(1)  # Keep the program running    except KeyboardInterrupt:        print("Exiting...")    finally:        GPIO.cleanup()if __name__ == "__main__":    main()

Code:

sudo python3 test.py MCP23017 configured. Waiting for interrupts...Interrupt detected! Flags: 0b11111011, GPIO state: 0b11111111Interrupt detected! Flags: 0b1000, GPIO state: 0b11110111Interrupt detected! Flags: 0b1000, GPIO state: 0b11111111Interrupt detected! Flags: 0b100000, GPIO state: 0b11011111Interrupt detected! Flags: 0b100000, GPIO state: 0b11111111Interrupt detected! Flags: 0b1000, GPIO state: 0b11110111Interrupt detected! Flags: 0b1000, GPIO state: 0b11111111Interrupt detected! Flags: 0b10, GPIO state: 0b11111111Interrupt detected! Flags: 0b1000, GPIO state: 0b11110111Interrupt detected! Flags: 0b1000, GPIO state: 0b11111111