I2C with Pi4j V2

[Brosbud]

Hi!

I'm having some trouble with getting the I2c to work.
I keep getting the following error messages;

• PIGPIO ERROR: PI_BAD_I2C_BUS: bad I2C bus
• PIGPIO ERROR: I2C/SPI/SERIAL HANDLE [-74]; Valid range >0

Is there something more that needs to be initialized? I'm following this example

Heres some of my code;

`
The I2C bus is 1
The I2C device is 0x48 as per the PCF8591 module
The I2C A0 is 0x40

    var pi4j = Pi4J.newAutoContext();

    var config = I2C.newConfigBuilder(pi4j)
            .id("i2c-ADC")
            .name("PCF8591")
            .bus(I2C_BUS)
            .device(I2C_DEVICE) 
            .build();

    I2CProvider i2CProvider = pi4j.provider("pigpio-i2c");

    try ( var i2c = i2CProvider.create(config)) {

        
        var register = i2c.register(I2C_A0);
        register.write(0x0D);
        byte readByte = register.readByte();
        System.out.println(readByte);

    }

`

[jveverka]

you may check also:
https://github.com/jveverka/rpi-projects/tree/pi4j-v2/rpi-drivers
https://github.com/jveverka/rpi-projects/blob/pi4j-v2/rpi-drivers/src/main/java/one/microproject/rpi/hardware/gpio/sensors/tests/PCF8591Test.java

[taartspi]

I did a copy paste of the example you referenced. That successfully executes the steps shown above. I changed the I2C_BUS value to 0 and see that same error you reported. As I do not have a device ACKing that address I then did change the address value to match my attached devices as validated with i2cdetect -y 1 and reset the I2C_BUS to 1. It executes to completion. Guess all I accomplished is validate the example works. Maybe time to run with a debugger and determine if others changed you made created this condition.