java-i2c-tools

Java i2c-tools wrapper

How to build and use

Build

./gradlew publishMavenJavaPublicationToMavenLocal

add to your pom.xml

<dependency>
    <groupId>com.github.452</groupId>
    <artifactId>java-i2c-tools</artifactId>
    <version>0.0.1</version>
</dependency>

Install i2c-tools

sudo apt install i2c-tools
# if you need permissions to your i2c bus
sudo chown $USER:$USER /dev/i2c-9

Usage example

More examples Groovy:

// grape uninstall "com.github.452" "java-i2c-tools" "0.0.1"
@Grab(group='com.github.452', module='java-i2c-tools', version='0.0.1')
import ua.kovel.java.i2c.tools.*;
I2C i2c = new I2C("i2c-tiny-usb", 0x76);
println "Response ${Integer.toHexString(i2c.readByte(0xD0))}"
I2C.availableAdapters().each() { adapter ->
	println "Name: $adapter.name id: $adapter.id"
}

Java:

import ua.kovel.java.i2c.tools.*;
I2C i2c = new I2C("i2c-tiny-usb", 0x76); // if you have connected i2c adapter to your pc or laptop, this way provide more comfortable i2c bus number auto detection
I2C i2c = new I2C(1, 0x76); // 1 bus number, 0x76 bme280 address
List<Adapter> adapters = I2C.availableAdapters();

i2c-tools basics commands example

# all instantiated I2C adapters
i2cdetect -l
# Get the list of detected peripherals on the specific I2C bus
i2cdetect -y 9
# Read all the registers from a peripheral
i2cdump -f -y 9 0x76
# read directly one register
i2cget -f -y 9 0x76 0xD0
# write directly a register
i2cset -f -y 0 0x5f 0x0f 0xac

Info

https://wiki.st.com/stm32mpu/wiki/I2C_i2c-tools https://medium.com/@sharpcoder/reading-i2c-data-sheets-and-implementing-them-on-the-raspberry-pi-266a5b9ed6e9