40pin IO Development

Experiment 06 - IIC Experiment

Software operation: (RDK X5 enables I2C5 by default on 40PIN (physical pins 3 and 5) and I2C0 (physical pins 27 and 28), IO voltage 3.3V.)

Enter the user home directory and run:

1. cd user
2. sudo python3 ./test_i2c.py

Terminal output as follows:

#!/usr/bin/env python3

import sys
import signal
import os
import time

# Import i2cdev
from i2cdev import I2C

def signal_handler(signal, frame):
    sys.exit(0)

def i2cdevTest():
    # device, bus = 0x51, 0
    bus = input("Please input I2C BUS num:")
    os.system('i2cdetect -y -r ' + bus)
    device = input("Please input I2C device num(Hex):")
    print("Read data from device %s on I2C bus %s" % (device, bus))
    i2c = I2C(eval("0x" + device), int(bus))
    value = i2c.read(1)
    i2c.write(value)
    print("read value=", value)
    i2c.close()

if __name__ == '__main__':
    signal.signal(signal.SIGINT, signal_handler)
    print("Starting demo now! Press CTRL+C to exit")
    print("List of enabled I2C controllers:")
    os.system('ls /dev/i2c*')
    while True:
        i2cdevTest()