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Stellaris® ARM® LM3S Microcontrollers Forum
I am using LM3S615 to monitor a sensor which has two signals one is output and the other is bidirectional, I wanted to know how to configure a GPIO pin as bidirectional should i keep it under hardware control?
Suspect response will be more coherent if you post sensor doc or link... Safest if you can employ Open Drain Stellaris Output Config - using pull-up R. You must prevent sensor & Stellaris outputs both active @ the same time - series R good preventive mechanism... (we need sensor data sheet)
The link to the sensor datasheet is as below.
http://www.sensirion.com/en/pdf/product_information/Datasheet-humidity-sensor-SHT1x.pdf, I cant use the R series of stellaris as I have to use only LM3S615.
The "R" I was referring to was a series resistor - placed between your Stellaris GPIO and the bi-directional pin of the sensor. It is used as a safety mechanism - just in case. (unaware of any Stellaris "R" Series) Once you've tested/verified your code - know that it's stable - you can remove or shunt out this series R - but it can "save" both your MCU & sensor should you make a serious mistake.
As you've identified the sensor - seem to recall that exact device was very well covered right here - on this forum. (use the "Search Community" (this forum) box above these posts - enter SHT sensor.) Believe that sensor is I2C - which does employ the Open Drain technique I mentioned - you will need pull up resistors on both clock and data (bi-di) lines. Do search for the past post - should have everything that you need...
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