PI40 and MCP23017 (i2c)

Topics that concern all LCD-PI shields. New drivers and images for Raspberry Pi will be released through this forum.

PI40 and MCP23017 (i2c)

Postby rbal » Sat Nov 08, 2014 2:30 pm


I have a Pi40 LCD installed on my raspberry pi (model B) with Raspbian (09-09-2014) and it works fine but i have a problem using it alongside the MCP23017 i2c microchip.

Before I installed the drivers for the PI40 the MCP23017 microchip works fine, when i type i2cdetect -y 1 on the terminal it shows the MCP23017 on port 0x20 and everything that is connected to the microchip work without a problem.
After I installed the drivers for the LCD the MCP23017 microchip still works but the values keep changing like the i2c bus is unstable.

If i disable the LCD module in /boot/config.txt the i2c works great again, so i think the drivers are interfering with the i2c bus or overwriting something.

If someone knows anything about this I will appreciate your help as I have being trying different version of Raspbian and re installing packages but no success.

Thank you
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Joined: Sat Nov 08, 2014 11:03 am

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