# Pmbus slave

## Overview

This example demonstrates I2C operating in slave mode as a PMbus device for data reception and transmission. You need to register handlers for PMbus command transactions. The PMbus slave protocol stack uses completion callback functions to print received or transmitted data and command-related messages.

## Board Setting

connect [I2C Pins](lab_board_app_i2c_pin) on the two boards。

## Running the example

- Run slave first, and then run master.

- When the example runs successfully, the log would be seen on the terminal like:

```console

PMbus slave test
pmbus(cmd:0x05) slave command transaction install success
pmbus(cmd:0x06) slave command transaction install success
pmbus(cmd:0x00) slave command transaction install success
pmbus(cmd:0x03) slave command transaction install success
pmbus(cmd:0x22) slave command transaction install success
cb:cmd: 0x05, read:true, pec_check:true, len:128, data_addr:0x0120a054
cb:cmd: 0x00, read:true, pec_check:true, len:1, data_addr:0x0120a054
cb:cmd: 0x03, read:true, pec_check:true, len:0, data_addr:0x0120a054
cb:cmd: 0x22, read:true, pec_check:true, len:2, data_addr:0x0120a054
cb:cmd: 0x00, read:false, pec_check:true, len:1, data_addr:0x01209fd4
cb:cmd: 0x06, read:false, pec_check:true, len:128, data_addr:0x01209fd4

```