MPC23017 works with Thinkpad Laptop i2c bus but it seems like it times out when writing to it too fast about abelectronics_python_libraries HOT 2 CLOSED

Hello Jardi

According to the datasheet for the MCP23017 on page 7 there are several minimum time delays for the data inputs and stop conditions that are needed for the chip to function correctly.

I expect what is happening is where the Thinkpad is running much faster than a Raspberry Pi it is not leaving a long enough delay after the I2C stop condition before sending the next packet.

You could try increasing the I2C bus speed to see if that fixes the problem. On the Raspberry Pi the IO Pi Plus can run up to 1MHz but depending on the capacitance of your Thinkpad's I2C bus you may find that you can not run that fast.

If increasing the bus speed does not work then adding the time.sleep() after each bus write is probably the only option to make it work.

from abelectronics_python_libraries.

Thanks for the reply! I figured that was the case.
Also, if you don't mind I'm planning on taking your module, add support for mcp23008 chip and upload it to PyPI with a more generic name.
I don't see any explicit licensing anywhere, so I thought I would ask here if that's ok.
Jardi.

Edit: Never mind, I just found the LICENSE file at the root of the python libraries project.

from abelectronics_python_libraries.