More Powerful LCD Commands

[shahidali55]

mister-e , in the "C" psuedo-code give on the link mentioned above ,
This is what i understood so far.
To send any data to the LCD, the "LCDNybble" function has to be called twice with the character / command data in the variable "Nybble".
The Nybble variable should be fed with the corresponding upper and lower bits sequentially.

Does the "LCDNybble" function take care of pulsing the E pin of LCD?
Myke has mentioned that before strobing the E pin, a 450ns pause is necessary.
Will PAUSEUS 1 work?

[skimask]

Myke has mentioned that before strobing the E pin, a 450ns pause is necessary.
Will PAUSEUS 1 work?

PAUSEUS 1 = 1000ns
1000ns > 450ns
Yes

[mister_e]

Math are good... but depending your OSC speed, you may want to use a serie of @ NOP instead.

Have a look in the manual about PAUSEUS limitations.

[shahidali55]

Based on the pseudo C code on page http://www.myke.com/lcd.htm,
i made my own code. I have attached it with this post.
Can someone chech it out and tell if what i've done is correct?
I tested the commands using Dincer's JavaScript LCD Simulator V 1.05.
(http://www.geocities.com/dinceraydin.../djlcdsim.html)
This code should display the digit "1" on the display.

[reaper0995]

might be kinda nice to have a least-significant-digit location set. for instance if you need to display a variable that changes from 1 digit (0-9) to 3 digits (100, etc), and you need to display 4 of them at a time, the code starts to get very lengthy....

i normally do an IF+THEN and if less than X, then add a space, but doing this for 4 variables, with 1 to 3 digits gets be rather long, and very hard to debug...

LCDOUT $FE, 1, DEC VAR [10], "Hello" 'display decimal value of <VAR> with least significant digit at space 10

[mister_e]

Sorry i don't follow you could you shed some light on that?

Why not updating only some fields on the LCD? Do you need Left/Right Aligned thingy?

[reaper0995]

Sorry i don't follow you could you shed some light on that?

Why not updating only some fields on the LCD? Do you need Left/Right Aligned thingy?

if you say this:


VAR = 1
LCDOUT $FE, 1, " ", DEC VAR 'three spaces

you will get on the screen
>___1< but lets say your variable becomes 100, you will get:
>___100< i want to get it to say:
>_100<


so the first digit of the variable is the "setpoint," and if its one or 5 digits long, the first one will always be in the same place. not too big of a deal, but if you want to run 2 or 3 variables on the screen at the same time (and vary from 1 to 100), then it kinda sucks to program that....