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by FrankFromGermany
Tue May 12, 2015 3:32 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: I2C MCP23017 crashes
Replies: 7
Views: 1526

Re: I2C MCP23017 crashes

It's a shame you are experiencing this problem, as a workaround you could interrupt the power to the defective MCP23017's (using a GPIO to switch a transistor) at a fixed interval. Yep! You're right it is shameful to sell defect stuff to others. - On the other hand i blame myself for hitting the "B...
by FrankFromGermany
Sat May 09, 2015 7:08 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: I2C MCP23017 crashes
Replies: 7
Views: 1526

Re: I2C MCP23017 crashes

It did help confirm a fault within the MCP23017 but that is not related to what you appear to be doing. Very interesting stuff! :o I'm writing a Perl module to comfortably access my LCD1602 Pi Plate from Adafruit. They only offer a Python module, which needs to be ran with root access... I prefer t...
by FrankFromGermany
Sat May 09, 2015 7:00 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: I2C MCP23017 crashes
Replies: 7
Views: 1526

Re: I2C MCP23017 crashes

So I would suspect you've got a borked MCP23017 chip or something wired wrong. MERDE!!! :x I bought 5 of them from a Chinese vendor for $1.25 each and they all show the same behavior. The one i bought from RadioShack works fine. - If it sounds too good to be true... Thank you very much for your help!
by FrankFromGermany
Fri May 08, 2015 11:04 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: I2C MCP23017 crashes
Replies: 7
Views: 1526

I2C MCP23017 crashes

Hi, i am trying to access an MCP23017 I/O-expander through the I2C user-space driver. Depending on the speed with which i send commands through the bus the chip seems to "crash" after a while - "crash" means that the i2cdetect utility does no longer report the address as occupied on the I2C-bus. The...

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