lcd_cmd(0x38); //8-bit interface,2 lines ?

[bianchi77]

Guys what's the init command for 8bit 20x4 lcd ?
I used
lcd_cmd(0x38); //8-bit interface,2 lines for two lines,

Thank you

 

[Ogu Reginald]

If you want to display only two lines in the LCD in question then the same command still holds.

 

[bianchi77]

I want to display 4 lines...., what's the init command ?
thanks

 

[91divine]

Is your LCD 16x2 or 16x4?

 

[paulfjujo]

hello,

I allready used a 4x16car LCD with a front I2C interface, in 4 bits mode.
For this 4 lines of 16 cars LCD
Init was done for 2 lines modes
but take care about the beginning of each line adress

// ref : ODT OCM-20416D-A2023 LCD Module  8/4/1999
// LCD Command
#define LCD_CLEAR 0x01
#define LCD_HOME  0x02
#define Display_ON 0x0C
#define Display_OFF 0x08
#define LCD_LINE1 0x80      // 0x00 + bit D7=1 
#define LCD_LINE2 0xC0      // 0x40 + bit D7=1 
#define LCD_LINE3 0x94      // 0x14 + bit D7=1 
#define LCD_LINE4 0xD4      // 0x54 + bit D7=1

 

[bianchi77]

it's 20x4 LCD...

 

[paulfjujo]

hello,

sorry !
Yes , it is for a 20x4 LCD (20416D)

 

[bianchi77]

thanks,

I got it
third line lcd_cmd(0x94);
fourth line lcd_cmd(0xD4);

Thank you

 

[Ogu Reginald]

The commands that you listed are for third and fourth lines respectively.
What is the command/instruction to make the LCD operate on 3 and 4 lines respectively just as (0X38) is used for 2 lines mode?

 

[paulfjujo]

hello,


There is no specifique bit setting commande in the init sequence to specifie 4 lines
in the datasheet you can specifie only 1 or 2 lines ,with parameter N
that is !
after you use the above adress ..to acces line 3 or 4...

see detalls in specsheet ..