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diamondjim

Fresh Boarder 		Click here to see the profile of this user

2006/11/05 20:01

Alpha-numeric LCD package

Has anyone written an alpha-numeric package for a 'standard' LCD for the 3S811 evaluation board? It would be straight forward to modify the one I use with AVR devices but, being a lazy devil, I wonder if anyone can save me the trouble?

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Capper

Expert Boarder 		Click here to see the profile of this user

2006/11/08 06:47

Re:Alpha-numeric LCD package

I wrote a bitmap converter for my G242C 240x128 LCD that uses a SED1335 controller IC. Here's a sample photo:



The only problem (so far) is that if I encode a full screen bitmap, my code goes over the limit of the Keil evaluation version compiler and crashes.

I HATE crippleware.

Capper

Post edited by: capper, at: 2006/11/08 06:53

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diamondjim

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2006/11/08 17:02

Re:Alpha-numeric LCD package

Rather than a full graphical display, I was thinking of an LCD using one of the Hitachi HD44780 type controllers to display several lines of alpha-numeric characters.

I've started amending the pacakge I wrote for an Atmel AVR series micro but am having initial difficulties configuring the GPIO port. It is clear that I don't yet understand completely how to configure a port using the Stellaris Driver Library.

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LMI Eric

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2006/11/08 17:35

Re:Alpha-numeric LCD package

If you need any pointers on GPIO port configuration, don't hesitate to ask.

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igorp

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2006/11/09 12:35

Re:Alpha-numeric LCD package

Well... could I ask about table 20.1 in LM3s811 datasheed comparing to table 20.2? Does in mean if I write 0 to all registers GPIODRxR the driver's current can be more than 100 mA in both directions? What about internal resistance of a driver? I haven't found any value in a datasheet as well as the maximal current it can be used for the whole sum of GPIO drivers.
I am not certain if the value I am asking for can be figured using table 19-2. Or I am missing something?

Regards

Igor

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LMI Eric

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2006/11/10 12:07

Re:Alpha-numeric LCD package

If you set all of the GPIODRxR registers to 0, the drive strength defaults to 2mA. The numbers in table 20-1 represent the amount of current that can be applied to a GPIO pin in input mode before the internal diode breaks down. When driving a GPIO pin (output mode), the maximum drive strength is specified by the GPIODRxR register.

The internal resistance of the GPIO pins is very high since they are CMOS inputs. They will be greater than 100kohm.

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