Read cursors position on LCD?

Is it possible to find current cursor possition on LCD (standard Hitachi controller) ? After reading LCD data sheet , couldnt find any address that holds cursors pos. , but maybe I'm wrong.

Yes, the operation is called "Read Busy Flag and Address".

You need connection of the R/W line.

Set R/W=1 (usually set 0), set RS=0, Busy Flag is returned in DB7, Address Counter is returned in DB0 thru DB6. There is no equivallent PICBasic instruction. LCDIN sets R/W=1 and RS=1. Close, but no cigar. LCDIn and LCDOut don't check the Busy Flag, they just use blind timing.

I normally have the PIC keep track of the Cursors position - LCD's aren't that big, so how hard is it to lose your Cursor?

Yes , found that info too, but I'm using 4-bit connection to LCD so this won't work. No one mentions if this is possible when using 4bit instead of 8.
I have complex manu map, and could to some things much easier if I knew possition of cursor .

Well.... you could try connecting the R/W line, assign a 2nd pin to the RS bit, put it and the existing RS pin line thru an AND gate (two Diodes and a Resistor would suffice) to the LCD, drive the new RS bit pin Low (forcing LCD RS Low) and then issue an LCDIN instruction... Do you feel lucky?

Quote:

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Originally Posted by Melanie

Well.... you could try connecting the R/W line, assign a 2nd pin to the RS bit, put it and the existing RS pin line thru an AND gate (two Diodes and a Resistor would suffice) to the LCD, drive the new RS bit pin Low (forcing LCD RS Low) and then issue an LCDIN instruction... Do you feel lucky?

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Lab,

do you really want to pay this price?

As Melanie already said, it is the PIC controlling the LCD, so how can you loose the cursor position?