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Smart IO Port C used as Input not working

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Tim

39 Posts

Posted - 20 May 2002 : 10:28:59

I am using Port C Option 2 for DIO input and output. I have 7 pins configured as output and 1 pin as input. The output pins work fine. The input pin never changes from 0 regardless of the input line state.

Anything obvious I'm missing? Can a port be configured as input and output?

ctacke

877 Posts

Posted - 20 May 2002 : 10:59:45

What revision of the AVR are you using? The system reports this information through the debug port at startup in a line like this:


 SMARTIO Detected : PartType:0x8535 Firmware:0x9002 Revision:5

This info is also queriable through the ADSmartIO API SIOReadDeviceVersion().

-----------------
Chris Tacke, eMVP
Applied Data Support

dbrisbois

27 Posts

Posted - 20 May 2002 : 11:31:06

Did you enable the internal pull-ups? One the pin is set to input by calling SIOInitDDRC (), you can enable or disable the pull-up by calling SIOWritePortC (). Write a 1 to the pin to enable the pull-up (0 to disable). See the following topic for more information.

topic.asp?TOPIC_ID=306

Tim

39 Posts

Posted - 20 May 2002 : 11:52:54

The Firmware version is 0x9002 and the device version is 0x34 according to SIOFirmwareVersion and SIOReadDeviceVersion.

ctacke

877 Posts

Posted - 20 May 2002 : 12:27:36

Revision 0x34 = Ascii "4", which means you have version 4 of the AVR.

Try updating to the latest revision (currently 5), which can be found here

-----------------
Chris Tacke, eMVP
Applied Data Support

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