Flex lcd driver and decimal numbers

[wordizlife]

Can this driver be used to properly send decimal numbers to the LCD or will we get errors?

[Ttelmah]

Yes, of course it can.
If used properly....

You need to send the correct ASCII code for the number you want. Fortunately, C allows you to do this by using lcd_putc('1');, (note the single inverted commas)which generates the ASCII code 00110001 (in binary), to display 1. Or if you have a variable, use 'printf', which converts binary numbers to their decimal, octal, or hex digit patterns, according to the format you select.
It wouldn't be much use if you couldn't use it to display numbers...

Best Wishes

[wordizlife]

Works fine for the numbers now, my problem was with my coding.

Now I am wondering how to get the screen to scroll up or down when needed. Can the lcd_gotoxy function be used for this?

[Mike Walne]

Most LCD effectively use a circular buffer.

When you send data to the LCD, the data is stored in RAM. What you see on the display is a window into the RAM. You can then change which data element appears in the top left hand corner of the display. By altering which data element appears in the top left you can achieve scrolling.

An alternative is to simply re-write the entire display.

Mike

[Ttelmah]

There isn't fundamentally a scroll up/down function in these LCD's.

Gotoxy, sets 'where' your next character will be drawn. Doesn't move the display.

There is a single character shift right/left available, but since the lines of the display are not adjacent in memory, this can't really be used to smoothly scroll up/down. You can send this with the send byte function, and scroll the screen text left/right. It uses codes 0x18, and 0x1C (for the two directions):
lcd_send_byte(0, 0x18); //To scroll left
lcd_send_byte(0, 0x1C); //To scroll right

Normally people do line scrolling by having their messages in a 'table', and just redrawing the required messages one line higher/lower in the window.

Best Wishes

[flint]

Hi everyone!
Please how do i request an input that will be displayed on a 16x2 lcd from a user(assuming i already designed they key pad), and then store the input. I am able to send messages to the screen, but don't know how to do this. Any help, suggestion is welcomed. Thanks

[Mike Walne]

What can't you do?

(1) Read the keypad.
(2) Handle the keypad data.
(3) Deal with user interaction.

Please be more specific.

Mike

[flint]

[Mike Walne]

OK. As always, loads of ways, assuming you have your keypad working. Here's a starter for ten:-

Create const character string "PASSWORD".
Create character string array input_buffer[x] longer than password.

Write prompt to LCD

[flint]

[PCM programmer]

Use the forum's search page to search for: keypad password
Set it to "Search for all terms".

If you did that, you would find threads like this, which have complete
code to enter a password from a keypad:
http://www.ccsinfo.com/forum/viewtopic.php?t=45935

But remember, we don't want to do your complete project for you.
That code only gives you the answer to part of your project.
You need to do the remainder of it.

[Mike Walne]

[PCM programmer]

Well, it was already in the archives, so I thought I'd give him half of the
answer. But you notice I made it clear that we won't do the whole thing
for him. I am not sure he can even understand the code that I linked for
him.

[flint]

Thanks guys am already on it, if i get stuck i will holla back.
Best regards.