The current implementation of the LinuxFS plugin implements a file based I2C provider. The file based provider opens
/dev/i2c-1
using a RandomAccessFile
to perform I2C reads and writes.
Providers in the LinuxFS plugin:
To use the LinuxFS provider include the following dependencies:
<dependency>
<groupId>com.pi4j</groupId>
<artifactId>pi4j-core</artifactId>
<version>${pi4j.version}</version>
</dependency>
<dependency>
<groupId>com.pi4j</groupId>
<artifactId>pi4j-plugin-raspberrypi</artifactId>
<version>${pi4j.version}</version>
</dependency>
<dependency>
<groupId>com.pi4j</groupId>
<artifactId>pi4j-plugin-linuxfs</artifactId>
<version>${pi4j.version}</version>
</dependency>
And then one can get access to the provider as follows:
Context pi4j = Pi4J.newAutoContext();
I2CProvider i2CProvider = pi4j.provider("linuxfs-i2c");
I2CConfig i2cConfig = I2C.newConfigBuilder(pi4j).id("TCA9534").bus(1).device(0x3f).build();
try (I2C tca9534Dev = i2CProvider.create(i2cConfig)) {
int config = tca9534Dev.readRegister(TCA9534_REG_ADDR_CFG);
tca9534Dev.writeRegister(TCA9534_REG_ADDR_OUT_PORT, currentState);
tca9534Dev.writeRegister(TCA9534_REG_ADDR_CFG, (byte) 0x00);
tca9534Dev.writeRegister(TCA9534_REG_ADDR_OUT_PORT, newState);
}
pi4j.shutdown();