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i2cdetect.py
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| #!/usr/bin/env python3 | |
| """ | |
| pi@raspberrypi:~ $ ./i2cdetect.py | |
| 0 1 2 3 4 5 6 7 8 9 a b c d e f | |
| 00: -- -- -- -- -- -- -- -- | |
| 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | |
| 20: -- -- -- -- -- -- -- 27 -- -- -- -- -- -- -- -- | |
| 30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | |
| 40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | |
| 50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | |
| 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- | |
| 70: -- -- -- -- -- -- -- -- | |
| """ | |
| import smbus2 | |
| import errno | |
| def i2cdetect(): | |
| bus_number = 1 # 1 indicates /dev/i2c-1 | |
| bus = smbus2.SMBus(bus_number) | |
| device_count = 0 | |
| for device in range(0x00, 128): | |
| if device==0: | |
| print(" ", " 0 1 2 3 4 5 6 7 8 9 a b c d e f", end="") | |
| if device%16==0: | |
| print() | |
| print("{0:02x}:".format(device), end="") | |
| if device<0x08 or device>0x77: | |
| print("", " ", end="") | |
| else: | |
| try: | |
| msg = smbus2.i2c_msg.write(device, []) | |
| bus.i2c_rdwr(msg) | |
| print("", "{0:2x}".format(device), end="") | |
| device_count = device_count + 1 | |
| except IOError as e: | |
| if e.errno == errno.EREMOTEIO: | |
| print("", "--", end="") | |
| else: | |
| print("", "!!", end="") | |
| except Exception as e: | |
| print("", "##", end="") | |
| print() | |
| bus.close() | |
| bus = None | |
| print("Found {0} device(s)".format(device_count)) | |
| if __name__ == "__main__": | |
| i2cdetect() |
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https://www.kernel.org/doc/Documentation/i2c/i2c-protocol
https://learn.adafruit.com/adafruits-raspberry-pi-lesson-4-gpio-setup/configuring-i2c
https://learn.sparkfun.com/tutorials/raspberry-pi-spi-and-i2c-tutorial/all
http://wiki.erazor-zone.de/wiki:linux:python:smbus:doc
https://github.com/kplindegaard/smbus2/blob/master/smbus2/smbus2.py
https://pypi.org/project/smbus2/
https://smbus2.readthedocs.io/en/latest/
https://forums.raspberrypi.com/viewtopic.php?t=114401
man i2cdetect