You can read our previous article where we had applied this trick for privilege escalation. Open the links given below As we all know in Linux everything is a file, including directories and devices which have permissions to allow or restrict three operations i.e. read/write/execute.If your system has one (or more) I2C controller(s) and one (or more) I2C multiplexer(s), you should be able to access each I2C device on any segment without doing "strange" operations but i2c classic ones. In other words, the user shouldn't have to know the I2C bus topology details nor the multiplexer internals.
I2C transactions consist of a start, a slave address selection, a read/write selection, a data transfer and then a stop. All data transfer is acknowledged by the receiver back to the transmitter. A data transfer can consist of one or more byte orientated read or write operations, but reads and writes cannot be mixed in a single transaction. zn_i2c_master_read_reg8 reads the value of the LIS3DH "Who Am I" register The app validates the result against the expected response and logs success or failure. zn_i2c_master_write_reg writes 4 values to successive LIS3DH registers with a single call using the auto-increment feature.
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