Tutorial MCP23017 verses PCA9535
The IO Pi Plus is a 32 channel MCP23017 GPIO expander for the Raspberry Pi
10/08/2022
Posted by:
inobu
Traceback (most recent call last):
File "/home/pi/led.py", line 5, in <module>
bus = IOPi(0x21)
File "/usr/local/lib/python3.9/dist-packages/IOPi/IOPi.py", line 117, in __init__
self.__bus.write_byte_data(self.__ioaddress, self.IOCON, self.__conf)
File "/usr/local/lib/python3.9/dist-packages/smbus2/smbus2.py", line 455, in write_byte_data
ioctl(self.fd, I2C_SMBUS, msg)
OSError: [Errno 121] Remote I/O error
Trying to see what was wrong I noticed the IOPi is written for the MCP23017. Pulling up the
datasheet for the current IO PiZero PCA9535 the command structure is different. Is the IO32
tutorial valid?
Inobu
11/08/2022
Posted by:
inobu
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: 20 21 -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
11/08/2022
Posted by:
inobu
I should have been here.
https://www.abelectronics.co.uk/kb/article/1099/io-zero-32-tutorial-1---the-blinking-led
Inobu
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