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

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bianchi77

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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
 

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

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

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

Code: 
// 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
 
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?
 

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 ..
 

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