LCD Cursor Quickie

jecottrell · Joined: 16 Jan 2005 Posts: 559 Location: Tucson, AZ

I'm getting deeper into displaying menu pages and I need to be able to enter 3 digit numbers. I am writing the routines that will accept the keypresses and display the numbers. I would like to use a cursor on pages that require data entry and no cursor on pages that don't. From my searching I see that cursor attributes are set during the lcd_init.

How can I change cursor attributes (cursor on and flash) on the fly? Do I just re-init the LCD with each change? Or can I just set the new attributes?

Thanks,

John

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

Use the lcd_send_byte() function, with the first parameter set to 0,
and then refer to the following post for the 2nd parameter:
http://www.ccsinfo.com/forum/viewtopic.php?t=20237&highlight=lcd+cursor

jecottrell · Joined: 16 Jan 2005 Posts: 559 Location: Tucson, AZ

Thanks PCM,

I had found your post in my readings and I had pasted those parameters into my lcd.c file for future reference . I just wasn't sure about how to set just the cusrsor stuff.

John

edhaslam · Joined: 15 Jul 2005 Posts: 89 Location: UK

jecottrell · Joined: 16 Jan 2005 Posts: 559 Location: Tucson, AZ

No, I didn't find any silverbullets or snippets that prevented large amounts of coding.

I am using a "state machine" scheme. I store menu lines in EEPROM and when I change from one state to the next I send the new menu display to the LCD. (I send the menu display to the LCD upon leaving the previous state.) Search for "state machine" and you'll find a simple boilerplate using switch statements. That was my starting point.

To enter digits for numerical data just think about this:

display = (display * 10) + keypress

BTW, I have found specific questions (usually from at least attempting the task) get answered very quickly in the forum. General questions don't elicit many responses because they imply an attempt hasn't been made. I'm new to all of this and I like to ask general questions too. Mostly about "which is better", etc. But they don't generally get much interest.

Good luck,

John